1
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Xie ZX, Cui YS, Liu XH, Yao JY, He SJ, Zhou B, Yue JM. Sesquiterpenoids and Cytochalasins with Immunosuppressive Activity from Sonchus wightianus. Chem Biodivers 2024; 21:e202400256. [PMID: 38361228 DOI: 10.1002/cbdv.202400256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 02/15/2024] [Accepted: 02/15/2024] [Indexed: 02/17/2024]
Abstract
The plant species, Sonchus wightianus DC., was historically used in China for both medicinal and dietary uses. In present study, seven new guaiane sesquiterpenoids (1-7) and one cytochalasin (8), along with five known guaianes (9-13) and two known cytochalasins (14 and 15), were isolated from the whole plants of S. wightianus. These guaianes showed structural variations in the substituents at C-8 and/or C-15, and compounds 6 and 7 are two sesquiterpenoid glycoside derivatives. Their structures were determined by extensive analysis of spectroscopic, electronic circular dichroism, and X-ray diffraction data, and chemical method. Biological tests revealed that compounds 5 and 8 are potent and selective immunosuppressive reagents.
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Affiliation(s)
- Zhi-Xiang Xie
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, 138 xianlin Road, Nanjing, 210023, P. R. China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, P. R. China
| | - Yong-Sheng Cui
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, 138 xianlin Road, Nanjing, 210023, P. R. China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, P. R. China
| | - Xi-Hong Liu
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, 138 xianlin Road, Nanjing, 210023, P. R. China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, P. R. China
| | - Jia-Ying Yao
- Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai, 201203, P. R. China
| | - Shi-Jun He
- Innovation Research Institute of Traditional Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 1200 Cailun Road, Shanghai, 201203, P. R. China
| | - Bin Zhou
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, P. R. China
| | - Jian-Min Yue
- School of Chinese Materia Medica, Nanjing University of Chinese Medicine, 138 xianlin Road, Nanjing, 210023, P. R. China
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai, 201203, P. R. China
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2
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Albano G, Portus L, Martinelli E, Pescitelli G, Di Bari L. Impact of Temperature on the Chiroptical Properties of Thin Films of Chiral Thiophene-based Oligomers. Chempluschem 2024:e202300667. [PMID: 38339881 DOI: 10.1002/cplu.202300667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/05/2024] [Accepted: 02/08/2024] [Indexed: 02/12/2024]
Abstract
According to the theoretical model based on the Mueller matrix approach, the experimental electronic circular dichroism (ECD) for thin films of chiral organic dyes can be expressed as the sum of several contributions, two of which are the most significant: 1) an intrinsic component (CDiso) invariant upon sample orientation, reflecting the molecular and/or supramolecular chirality, due to 3D-chiral nanoscopic structures; 2) a non-reciprocal component (LDLB) which inverts its sign upon sample flipping, which arises from the interaction of linear dichroism and linear birefringence in locally anisotropic domains, expression of 2D-chiral micro/mesoscopic structures. In this work, we followed in parallel through ECD and differential scanning calorimetry (DSC) the temperature evolution of the supramolecular arrangements of thin films of five structurally related chiral thiophene-based oligomers with different LDLB/CDiso ratio. By increasing the temperature, regardless of phase transitions observed by DSC analysis, systems with strong CDiso revealed no changes in the ECD spectrum, while compounds with dominant LDLB contribution underwent a gradual (and reversible) reduction of (apparent) ECD signals. These findings demonstrated that the concomitant occurrence of intrinsic and non-reciprocal components in the ECD spectrum of thin films of chiral organic dyes is strictly correlated with solid-state organizations of different stability.
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Affiliation(s)
- Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
| | - Lorenzo Portus
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
| | - Elisa Martinelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
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3
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Albano G, Aronica LA, Pescitelli G, Di Bari L. Chiral diketopyrrolo[3,4-c]pyrrole-based oligothiophenes: Synthesis and characterization of aggregated states in solution and thin films. Chirality 2024; 36:e23608. [PMID: 37424264 DOI: 10.1002/chir.23608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/20/2023] [Accepted: 06/22/2023] [Indexed: 07/11/2023]
Abstract
In this work, we synthesized a family of three structurally related chiral oligothiophenes containing a 1,4-diketo-3,6-diarylpyrrolo[3,4-c]pyrrole (DPP) unit as the central core; functionalized with the same (S)-3,7-dimethyl-1-octyl chains on the nitrogen atoms of lactam moieties, they only differ in the number of lateral thiophene units. The aggregation modes of these π-conjugated chiral systems were evaluated by means of UV-Vis absorption and ECD spectroscopies in conditions of solution aggregation (CHCl3 /MeOH mixtures) and as thin films, describing in particular the impact of the π-conjugation length on the chiroptical properties. Interestingly, we found that the variable number of thiophene units attached to the DPP core affects not only the propensity to aggregation but also the aggregates' helicity. ECD revealed information about the supramolecular arrangement of these molecules, that one would not obtain by using conventional optical spectroscopy and microscopy techniques. Thin film samples revealed very different aggregation modes with respect to solution aggregates, casting doubts on the common assumption that these latter may serve as simple models of the former ones.
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Affiliation(s)
- Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | | | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
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4
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Albano G, Taddeucci A, Pescitelli G, Di Bari L. Spatially Resolved Chiroptical Spectroscopies Emphasizing Recent Applications to Thin Films of Chiral Organic Dyes. Chemistry 2023; 29:e202301982. [PMID: 37515814 DOI: 10.1002/chem.202301982] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 07/28/2023] [Accepted: 07/28/2023] [Indexed: 07/31/2023]
Abstract
Instrumental techniques able to identify and structurally characterize the aggregation states in thin films of chiral organic π-conjugated materials, from the first-order supramolecular arrangement up to the microscopic and mesoscopic scale, are very helpful for clarifying structure-property relationships. Chiroptical imaging is currently gaining a central role, for its ability of mapping local supramolecular structures in thin films. The present review gives an overview of electronic circular dichroism imaging (ECDi), circularly polarized luminescence imaging (CPLi), and vibrational circular dichroism imaging (VCDi), with a focus on their applications on thin films of chiral organic dyes as case studies.
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Affiliation(s)
- Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
| | - Andrea Taddeucci
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
- Diamond Light Source, Ltd., Chilton, Didcot, OX11 0DE, UK
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
| | - Lorenzo Di Bari
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi 13, 56124, Pisa, Italy
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5
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Coehlo M, Thuéry P, Pieters G. Chiral perturbation on single benzene-based fluorophores: A structure/(chir)optical activity relationship study. Chirality 2023; 35:796-804. [PMID: 37161511 DOI: 10.1002/chir.23577] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 04/20/2023] [Accepted: 04/22/2023] [Indexed: 05/11/2023]
Abstract
In this paper, we describe the synthesis and the (chir)optical properties of a novel series of circularly polarized luminescent emitters. These molecules involve a compact single benzene-based donor-acceptor fluorophore composed of two cyclic alkylamines as electron donors and a phthalonitrile moiety as electron acceptor linked to a configurationally stable BINOL acting as a chiral perturbation unit. These new compounds display fair quantum yields (up to 66%) with emission maxima around 500 nm in toluene solutions, and the study of their chiroptical properties has shown that the cyclic alkylamine's ring size affects significantly the luminescence dissymmetry factors, reaching 2.2 × 10-3 for the larger cyclic alkylamine moieties.
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Affiliation(s)
- Max Coehlo
- Université Paris-Saclay, CEA, INRAE, DMTS, SCBM, Gif-sur-Yvette, France
| | - Pierre Thuéry
- Université Paris-Saclay, CEA, CNRS, NIMBE, Gif-sur-Yvette, France
| | - Grégory Pieters
- Université Paris-Saclay, CEA, INRAE, DMTS, SCBM, Gif-sur-Yvette, France
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6
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Duong TH, Le HT, Nguyen TVA, Tri MD, Pham NKT, Nguyen HT, Nguyen NH, Nguyen HH, Vu TY. A New Carvotacetone Derivative from the Aerial Part of Sphaeranthus africanus. Chem Biodivers 2023:e202300319. [PMID: 37183173 DOI: 10.1002/cbdv.202300319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 05/10/2023] [Accepted: 05/11/2023] [Indexed: 05/16/2023]
Abstract
Sphaeranthus africanus L. is native in Vietnam. Little is known about alpha-glucosidase inhibition of Sphaeranthus africanus and its isolated compounds. A bioactive-guided isolation was applied to the Vietnamese Sphaeranthus africanus to find alpha-glucosidase inhibitory components. Eight compounds were detected and structurally elucidated. They are 3-angeloyloxy-5-[2″,3″-epoxy-2″-methylbutanoyloxy]-7-hydroxycarvotacetone, 3-angeloyloxy-5-[3″-chloro-2″-hydroxy-2″-methylbutanoyloxy]-7-hydroxycarvotacetone, 3-angeloyloxy-5-[2″R,3″R-dihydroxy-2″-methyl-butanoyloxy]-7-hydroxycarvotacetone, 3-angeloyloxy-5-[2″S,3″R-dihydroxy-2″-methyl-butanoyloxy]-7-hydroxycarvotacetone, 3-angeloyloxy-5-[2″S,3″S-dihydroxy-2″-methyl-butanoyloxy]-7-hydroxycarvotacetone, 5-angeloyloxy-7-hydroxy-3-tigloyloxycarvotacetone, 3-O-methylquercetin, and chrysosplenol D. Their chemical structures were elucidated by extensive 1D and 2D NMR analysis and high-resolution mass spectroscopy as well as comparisons in literature. 3-Angeloyloxy-5-[2″S,3″S-dihydroxy-2″-methyl-butanoyloxy]-7-hydroxycarvotacetone is a new compound. Isolated compounds were evaluated for the alpha-glucosidase inhibition. Isolated compounds showed moderate activity with IC50 values ranging from 128.9-274.3 µM while others are weak. A molecular docking study was conducted, indicating that isolated compounds are potent alpha-glucosidase inhibitory compounds.
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Affiliation(s)
- Thuc Huy Duong
- Hochiminh city University of Education, Department of Chemistry, 280 An Duong Vuong Street, District 5, Hochiminh city, VIET NAM
| | - Huong Thuy Le
- Ton Duc Thang University, Faculty of Pharmacy, Nguyen Huu Tho, Ho Chi Minh City, VIET NAM
| | - Tran-Van-Anh Nguyen
- Ton Duc Thang University, Faculty of Pharmacy, Nguyen Huu Tho, Ho Chi Minh Cỉty, VIET NAM
| | - Mai Dinh Tri
- Vietnam Academy of Science and Technology, Graduate University of Science and Technology, Thanh Loc, Ho Chi Minh City, VIET NAM
| | - Nguyen-Kim-Tuyen Pham
- Saigon University, Faculty of Environmental Science, An Duong Vuong, Ho Chi Minh City, VIET NAM
| | - Huy Truong Nguyen
- Ton Duc Thang University, Faculty of Pharmacy, Nguyen Huu Tho, Ho Chi Minh Cỉty, VIET NAM
| | - Ngoc-Hong Nguyen
- HUTECH University: HUTECH, Cirtect Institute, Dien Bien Phu, Ho Chi Minh City, VIET NAM
| | - Huu-Hung Nguyen
- Van Lang University: Truong Dai hoc Van Lang, Faculty of Applied Technology, School of Technology, Van Lang University, 084, Ho Chi Minh City, VIET NAM
| | - Thien-Y Vu
- Ton Duc Thang University, Faculty of Pharmacy, Nguyen Huu Tho, Ho Chi Minh Cỉty, VIET NAM
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7
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Zhang KF, Saleh N, Swierczewski M, Rosspeintner A, Zinna F, Pescitelli G, Besnard C, Guénée L, Bürgi T, Lacour J. Multistate Aggregation-Induced Chiroptical Properties of Enantiopure Disulfide-Mediated BisPyrene Macrocycles. Angew Chem Int Ed Engl 2023:e202304075. [PMID: 37158668 DOI: 10.1002/anie.202304075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/13/2023] [Accepted: 05/09/2023] [Indexed: 05/10/2023]
Abstract
A chiral bispyrene macrocycle designed for exclusive intermolecular excimer fluorescence upon aggregation was synthesized by a double hydrothiolation of a bis enol ether macrocycle followed by intramolecular oxidation of free thiols. Unusually high stereoselectivity was achieved for the thiol-ene additions under templated conditions and Et3B/O2 radical initiation. After enantiomer separation (chiral stationary phase HPLC), aqueous conditions provoked aggregation. Detailed structural evolution was afforded by ECD/CPL monitoring. Three regimes can be observed and characterized by strong modifications in chiroptical patterns under, at, or above a 70% H2O:THF threshold. In luminescence, high glum dissymmetry factors values were obtained, up to 0.022, as well as a double sign inversion of CPL signals during the aggregation, a behavior rationalized by time-dependent density functional theory (TDDFT) calculations. Langmuir layers of enantiopure disulfide macrocycles were formed at the air-water interface and transferred onto solid substrates to afford Langmuir-Blodgett films, which were then studied by AFM and UV/ECD/fluorescence/CPL.
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Affiliation(s)
- Ke-Feng Zhang
- Universite de Geneve, Organic chemistry, SWITZERLAND
| | - Nidal Saleh
- Universite de Geneve, Organic Chemistry, SWITZERLAND
| | | | | | - Francesco Zinna
- University of Pisa: Universita degli Studi di Pisa, Chimica e Chimica Industriale, ITALY
| | - Gennaro Pescitelli
- University of Pisa: Universita degli Studi di Pisa, Chimica e Chimica Industriale, ITALY
| | - Céline Besnard
- Universite de Geneve, Laboratoire de Cristallographie, SWITZERLAND
| | - Laure Guénée
- Universite de Geneve, Laboratoire de Cristallographie, SWITZERLAND
| | - Thomas Bürgi
- Universite de Geneve, Physical Chemistry, SWITZERLAND
| | - Jerome Lacour
- University of Geneva, Department of Organic Chemistry, Quai Ernest Ansermet 30, CH-1211, Geneva 4, SWITZERLAND
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Aschi M, Palombi L, Amadei A. Theoretical-Computational Modeling of CD Spectra of Aqueous Monosaccharides by Means of Molecular Dynamics Simulations and Perturbed Matrix Method. Molecules 2023; 28:molecules28083591. [PMID: 37110825 PMCID: PMC10144652 DOI: 10.3390/molecules28083591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 04/12/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
The electronic circular dichroism (ECD) spectra of aqueous d-glucose and d-galactose were modeled using a theoretical-computational approach combining molecular dynamics (MD) simulations and perturbed matrix method (PMM) calculations, hereafter termed MD-PMM. The experimental spectra were reproduced with a satisfactory accuracy, confirming the good performances of MD-PMM in modeling different spectral features in complex atomic-molecular systems, as already reported in previous studies. The underlying strategy of the method was to perform a preliminary long timescale MD simulation of the chromophore followed by the extraction of the relevant conformations through essential dynamics analysis. On this (limited) number of relevant conformations, the ECD spectrum was calculated via the PMM approach. This study showed that MD-PMM was able to reproduce the essential features of the ECD spectrum (i.e., the position, the intensity, and the shape of the bands) of d-glucose and d-galactose while avoiding the rather computationally expensive aspects, which were demonstrated to be important for the final outcome, such as (i) the use of a large number of chromophore conformations; (ii) the inclusion of quantum vibronic coupling; and (iii) the inclusion of explicit solvent molecules interacting with the chromophore atoms within the chromophore itself (e.g., via hydrogen bonds).
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Affiliation(s)
- Massimiliano Aschi
- Dipartimento di Scienze Fisiche e Chimiche, Università dell'Aquila via Vetoio (Coppito 2), 67010 l'Aquila, Italy
| | - Laura Palombi
- Dipartimento di Scienze Fisiche e Chimiche, Università dell'Aquila via Vetoio (Coppito 2), 67010 l'Aquila, Italy
| | - Andrea Amadei
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy
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9
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Almeida AS, Silva B, Silva JP, Pereira JA, Remião F, Fernandes C. Semi-Preparative Separation, Absolute Configuration, Stereochemical Stability and Effects on Human Neuronal Cells of MDPV Enantiomers. Molecules 2023; 28. [PMID: 36903367 DOI: 10.3390/molecules28052121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 02/18/2023] [Accepted: 02/21/2023] [Indexed: 03/03/2023] Open
Abstract
Synthetic cathinones, such as 3,4-methylenedioxypyrovalerone (MDPV), are widely abused due to their psychostimulant effects. As they are chiral molecules, studies of their stereochemical stability (racemization can occur in certain temperatures and acidic/basic environments) and of their biological and/or toxicity effects (enantiomers might display different properties) are of great relevance. In this study, the liquid chromatography (LC) semi-preparative enantioresolution of MDPV was optimized to collect both enantiomers with high recovery rates and enantiomeric ratio (e.r.) values. The absolute configuration of the MDPV enantiomers was determined by electronic circular dichroism (ECD) with the aid of theoretical calculations. The first eluted enantiomer was identified as S-(-)-MDPV and the second eluted enantiomer was identified as R-(+)-MDPV. A racemization study was performed by LC-UV, showing enantiomers' stability up to 48 h at room temperature and 24 h at 37 °C. Racemization was only affected by higher temperatures. The potential enantioselectivity of MDPV in cytotoxicity and in the expression of neuroplasticity-involved proteins-brain-derived neurotrophic factor (BDNF) and cyclin-dependent kinase 5 (Cdk5)-was also evaluated using SH-SY5Y neuroblastoma cells. No enantioselectivity was observed.
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10
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Cerezo J, Santoro F. FCclasses3: Vibrationally-resolved spectra simulated at the edge of the harmonic approximation. J Comput Chem 2023; 44:626-643. [PMID: 36380723 PMCID: PMC10100349 DOI: 10.1002/jcc.27027] [Citation(s) in RCA: 30] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/03/2022] [Accepted: 10/16/2022] [Indexed: 11/17/2022]
Abstract
We introduce FCclasses3, a code to carry out vibronic simulations of electronic spectra and nonradiative rates, based on the harmonic approximation. Key new features are: implementation of the full family of vertical and adiabatic harmonic models, vibrational analysis in curvilinear coordinates, extension to several electronic spectroscopies and implementation of time-dependent approaches. The use of curvilinear valence internal coordinates allows the adoption of quadratic model potential energy surfaces (PES) of the initial and final states expanded at arbitrary configurations. Moreover, the implementation of suitable projectors provides a robust framework for defining reduced-dimensionality models by sorting flexible coordinates out of the harmonic subset, so that they can then be treated at anharmonic level, or with mixed quantum classical approaches. A set of tools to facilitate input preparation and output analysis is also provided. We show the program at work in the simulation of different spectra (one and two-photon absorption, emission and resonance Raman) and internal conversion rate of a typical rigid molecule, anthracene. Then, we focus on absorption and emission spectra of a series of flexible polyphenyl molecules, highlighting the relevance of some of the newly implemented features. The code is freely available at http://www.iccom.cnr.it/en/fcclasses/.
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Affiliation(s)
- Javier Cerezo
- Departamento de Química and Institute for Advanced Research in Chemical Sciences (IAdChem)Universidad Autónoma de MadridMadridSpain
- Consiglio Nazionale delle RicercheIstituto di Chimica dei Composti Organo Metallici (ICCOM‐CNR)PisaItaly
| | - Fabrizio Santoro
- Consiglio Nazionale delle RicercheIstituto di Chimica dei Composti Organo Metallici (ICCOM‐CNR)PisaItaly
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11
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Cheng H, Yan D, Wu L, Liang P, Cai Y, Li L. Chemical characterization, absolute configuration and optical purity of (1S)-(+)- and (1R)-(-)-10-camphorsulfonic acid. Acta Crystallogr C Struct Chem 2022; 78:531-541. [PMID: 36196786 DOI: 10.1107/s2053229622008592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 08/26/2022] [Indexed: 11/11/2022] Open
Abstract
Comprehensive chemical characterization for two isomers of camphorsulfonic acid (CSA), occasionally used in the manufacture of active pharmaceutical ingredients (APIs), was performed by nuclear magnetic resonance (NMR) spectroscopy, high-resolution mass spectroscopy in negative electrospray ionization mode and gas chromatography/mass spectrometry (GC/MS) in electron ionization mode. Electronic circular dichroism (ECD) spectra together with quantum chemical calculations using time-dependent density functional theory (TD-DFT) were used to assign the stereochemistry for CSA for the first time and these assignments were then confirmed by single-crystal X-ray diffraction. As crystals were grown under the same conditions of high supersaturation using a mixed solvent without water removal, the crystal structures of the two enantiomers contained one ordered molecule of water in the asymmetric unit. The crystals of the (+)-enantiomer have a 1S,4R configuration and the H atom of the sulfonic acid group combines with the water molecule to form a hydronium ion, namely, hydronium (1S,4R)-(7,7-dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonate, H3O+·C10H15O4S-. The crystals of the (-)-enantiomer have a 1R,4S configuration. The determination of the optical purity of CSA using NMR spectroscopy with a chiral solvating agent, (1R,2R)-1,2-diphenylethane-1,2-diamine, and GC/MS with a chiral column has been well explored. The results showed that the examined samples of these two isomers of CSA proved to be enantiomerically pure. In particular, for (1R)-(-)-10-camphorsulfonic acid, this is, to our knowledge, the first description on its spectral characterization in a scientific context.
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Affiliation(s)
- Hong Cheng
- Analytical and Testing Center, Huazhong University of Science and Technology, 430074 Wuhan, Hubei Province, People's Republic of China
| | - Dingce Yan
- Analytical and Testing Center, Huazhong University of Science and Technology, 430074 Wuhan, Hubei Province, People's Republic of China
| | - Liqing Wu
- National Institute of Metrology, 100029 Beijing, People's Republic of China
| | - Ping Liang
- Analytical and Testing Center, Huazhong University of Science and Technology, 430074 Wuhan, Hubei Province, People's Republic of China
| | - Yuncheng Cai
- Analytical and Testing Center, Huazhong University of Science and Technology, 430074 Wuhan, Hubei Province, People's Republic of China
| | - Li Li
- Beijing Key Laboratory of Active Substances Discovery and Druggability, Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, 100050 Beijing, People's Republic of China
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12
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Szabó Z, Paczal A, Kovács T, Mándi A, Kotschy A, Kurtán T. Synthesis and Vibrational Circular Dichroism Analysis of N-Heterocyclic Carbene Precursors Containing Remote Chirality Centers. Int J Mol Sci 2022; 23:ijms23073471. [PMID: 35408831 PMCID: PMC8999040 DOI: 10.3390/ijms23073471] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 03/17/2022] [Accepted: 03/18/2022] [Indexed: 01/01/2023] Open
Abstract
VCD analysis of 16 diastereomeric pairs of NHC precursors containing two isolated chirality centers and different substitution patterns identified VCD transitions characteristic of the chirality center in the imidazolium ring or in the side chain, which, in contrast to ECD and OR, could be utilized to assign the two chirality centers separately by simple comparison, regardless of the type and position of achiral aromatic substituents. While the ECD and OR data showed great dependence on the position of an achiral substituent such as a methoxy group, characteristic experimental VCD transitions remained consistent and they could be used to determine the absolute configuration of all the regio- and stereoisomers and substituted analogues. VCD, ECD and OR approaches were evaluated, and several carbene precursors were found, for which only the VCD method could distinguish the four stereoisomers. With t-butyl, phenyl or 2-naphthyl substituents at the C-1′ chirality center, the ECD spectra of the C-1′ epimers were near-identical, and hence it was only the VCD approach that showed distinct differences suitable for the configurational assignment. The chiroptical characterization of our diastereomeric pairs of NHC precursors enables the future application of related derivatives having different substitution patterns in stereoselective transformations.
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Affiliation(s)
- Zita Szabó
- Servier Research Institute of Medicinal Chemistry, Záhony u. 7., 1031 Budapest, Hungary; (Z.S.); (A.P.)
| | - Attila Paczal
- Servier Research Institute of Medicinal Chemistry, Záhony u. 7., 1031 Budapest, Hungary; (Z.S.); (A.P.)
| | - Tibor Kovács
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary; (T.K.); (A.M.)
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary; (T.K.); (A.M.)
| | - Andras Kotschy
- Servier Research Institute of Medicinal Chemistry, Záhony u. 7., 1031 Budapest, Hungary; (Z.S.); (A.P.)
- Correspondence: (A.K.); (T.K.)
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, P.O. Box 400, 4002 Debrecen, Hungary; (T.K.); (A.M.)
- Correspondence: (A.K.); (T.K.)
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13
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Pescitelli G. ECD exciton chirality method today: a modern tool for determining absolute configurations. Chirality 2021; 34:333-363. [PMID: 34791704 PMCID: PMC9299504 DOI: 10.1002/chir.23393] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/26/2021] [Accepted: 10/27/2021] [Indexed: 02/02/2023]
Abstract
The application of the exciton chirality method (ECM) to interpret electronic circular dichroism (ECD) spectra is a well‐established and still popular approach to assign the absolute configuration (AC) of natural products, chiral organic compounds, and organometallic species. The method applies to compounds containing at least two chromophores with electric dipole allowed transitions (e.g., π–π* transitions). The exciton chirality rule correlates the sign of an exciton couplet (two ECD bands with opposite sign and similar intensity) with the overall molecular stereochemistry, including the AC. A correct application of the ECM requires three main prerequisites: (a) the knowledge of the molecular conformation, (b) the knowledge of the directions of the electric transition moments (TDMs), and (c) the assumption that the exciton coupling mechanism must be the major source of the observed ECD signals. All these prerequisites can be easily verified by means of quantum‐mechanical (QM) calculations. In the present review, we shortly introduce the general principles that underpin the use of the ECM for configurational assignments and survey its applications, both classic ones and some reported in the recent literature. Based on these examples, we will stress the advantages of the ECM but also the key requisites for its correct application. Additionally, we will discuss the dependence of the couplet sign on geometrical parameters (angles α,β,γ between TDMs), which can be helpful for discerning the sign of exciton chirality in ambiguous situations. Finally, we will present a molecular orbital (MO) description of the exciton coupling phenomenon.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
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14
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Domzalski A, Margent L, Vigo V, Dewan F, Pilarsetty NVK, Xu Y, Kawamura A. Unambiguous Stereochemical Assignment of Cyclo(Phe-Pro), Cyclo(Leu-Pro), and Cyclo(Val-Pro) by Electronic Circular Dichroic Spectroscopy. Molecules 2021; 26:molecules26195981. [PMID: 34641525 PMCID: PMC8512403 DOI: 10.3390/molecules26195981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/23/2021] [Accepted: 09/28/2021] [Indexed: 11/21/2022] Open
Abstract
2,5-diketopiperazines (DKPs) are cyclic dipeptides ubiquitously found in nature. In particular, cyclo(Phe-Pro), cyclo(Leu-Pro), and cyclo(Val-Pro) are frequently detected in many microbial cultures. Each of these DKPs has four possible stereoisomers due to the presence of two chirality centers. However, absolute configurations of natural DKPs are often ambiguous due to the lack of a simple, sensitive, and reproducible method for stereochemical assignment. This is an important problem because stereochemistry is a key determinant of biological activity. Here, we report a synthetic DKP library containing all stereoisomers of cyclo(Phe-Pro), cyclo(Leu-Pro), and cyclo(Val-Pro). The library was subjected to spectroscopic characterization using mass spectrometry, NMR, and electronic circular dichroism (ECD). It turned out that ECD can clearly differentiate DKP stereoisomers. Thus, our ECD dataset can serve as a reference for unambiguous stereochemical assignment of cyclo(Phe-Pro), cyclo(Leu-Pro), and cyclo(Val-Pro) samples from natural sources. The DKP library was also subjected to a biological screening using assays for E. coli growth and biofilm formation, which revealed distinct biological effects of cyclo(D-Phe-L-Pro).
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Affiliation(s)
- Alison Domzalski
- Biochemistry Ph.D. Program, The Graduate Center of CUNY, New York, NY 10016, USA; (A.D.); (F.D.); (Y.X.)
- Department of Chemistry, Hunter College of CUNY, New York, NY 10065, USA; (L.M.); (V.V.)
| | - Liliana Margent
- Department of Chemistry, Hunter College of CUNY, New York, NY 10065, USA; (L.M.); (V.V.)
| | - Valeria Vigo
- Department of Chemistry, Hunter College of CUNY, New York, NY 10065, USA; (L.M.); (V.V.)
| | - Faizunnahar Dewan
- Biochemistry Ph.D. Program, The Graduate Center of CUNY, New York, NY 10016, USA; (A.D.); (F.D.); (Y.X.)
- Department of Chemistry, Hunter College of CUNY, New York, NY 10065, USA; (L.M.); (V.V.)
| | | | - Yujia Xu
- Biochemistry Ph.D. Program, The Graduate Center of CUNY, New York, NY 10016, USA; (A.D.); (F.D.); (Y.X.)
- Department of Chemistry, Hunter College of CUNY, New York, NY 10065, USA; (L.M.); (V.V.)
- Chemistry Ph.D. Program, The Graduate Center of CUNY, New York, NY 10016, USA
| | - Akira Kawamura
- Biochemistry Ph.D. Program, The Graduate Center of CUNY, New York, NY 10016, USA; (A.D.); (F.D.); (Y.X.)
- Department of Chemistry, Hunter College of CUNY, New York, NY 10065, USA; (L.M.); (V.V.)
- Chemistry Ph.D. Program, The Graduate Center of CUNY, New York, NY 10016, USA
- Correspondence: ; Tel.: +1-212-772-5339
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15
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Puente AR, Bessaguet A, Pairault N, Pieters G, Crassous J, Polavarapu PL, Opalinski I, Papot S. Absolute configuration of a [1]rotaxane determined from vibrational and electronic circular dichroism spectra. Chirality 2021; 33:773-782. [PMID: 34590354 DOI: 10.1002/chir.23365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 09/02/2021] [Accepted: 09/06/2021] [Indexed: 11/07/2022]
Abstract
The experimental vibrational circular dichroism (VCD) and electronic circular dichroism (ECD) spectra were measured for the enantiomers of [1]rotaxane 1. These experimental spectra have been analyzed using predicted VCD and ECD spectra for (S, Rmp ) or (S, Smp ) diastereomers using density functional theory. This comparison allowed for a definitive assignment of the absolute configuration of 1.
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Affiliation(s)
- Andrew R Puente
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Adrien Bessaguet
- Institut de Chimie des Milieux et des Matériaux de Poitiers (IC2MP), Groupe "Système Moléculaires Programmés", UMR CNRS 7285, Université de Poitiers, Poitiers Cedex 9, France
| | - Noël Pairault
- Institut de Chimie des Milieux et des Matériaux de Poitiers (IC2MP), Groupe "Système Moléculaires Programmés", UMR CNRS 7285, Université de Poitiers, Poitiers Cedex 9, France
| | - Grégory Pieters
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), SCBM, 91191 Gif-sur-Yvette, France, Gif-sur-Yvette, France
| | - Jeanne Crassous
- Institut des Sciences Chimiques de Rennes, UMR CNRS 6226, Campus de Beaulieu, Univ Rennes, Rennes Cedex, France
| | | | - Isabelle Opalinski
- Institut de Chimie des Milieux et des Matériaux de Poitiers (IC2MP), Groupe "Système Moléculaires Programmés", UMR CNRS 7285, Université de Poitiers, Poitiers Cedex 9, France
| | - Sébastien Papot
- Institut de Chimie des Milieux et des Matériaux de Poitiers (IC2MP), Groupe "Système Moléculaires Programmés", UMR CNRS 7285, Université de Poitiers, Poitiers Cedex 9, France
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16
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Machalska E, Zajac G, Wierzba AJ, Kapitán J, Andruniów T, Spiegel M, Gryko D, Bouř P, Baranska M. Recognition of the True and False Resonance Raman Optical Activity. Angew Chem Int Ed Engl 2021; 60:21205-21210. [PMID: 34216087 PMCID: PMC8519086 DOI: 10.1002/anie.202107600] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 07/01/2021] [Indexed: 12/16/2022]
Abstract
Resonance Raman optical activity (RROA) possesses all aspects of a sensitive tool for molecular detection, but its measurement remains challenging. We demonstrate that reliable recording of RROA of chiral colorful compounds is possible, but only after considering the effect of the electronic circular dichroism (ECD) on the ROA spectra induced by the dissolved chiral compound. We show RROA for a number of model vitamin B12 derivatives that are chemically similar but exhibit distinctively different spectroscopic behavior. The ECD/ROA effect is proportional to the concentration and dependent on the optical pathlength of the light propagating through the sample. It can severely alter relative band intensities and signs in the natural RROA spectra. The spectra analyses are supported by computational modeling based on density functional theory. Neglecting the ECD effect during ROA measurement can lead to misinterpretation of the recorded spectra and erroneous conclusions about the molecular structure.
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Affiliation(s)
- Ewa Machalska
- Faculty of ChemistryJagiellonian UniversityGronostajowa 230-387KrakowPoland
- Jagiellonian Centre for Experimental Therapeutics (JCET)Jagiellonian UniversityBobrzynskiego 1430-348KrakowPoland
| | - Grzegorz Zajac
- Jagiellonian Centre for Experimental Therapeutics (JCET)Jagiellonian UniversityBobrzynskiego 1430-348KrakowPoland
- Institute of Organic Chemistry and BiochemistryAcademy of SciencesFlemingovo náměstí 216610PragueCzech Republic
| | - Aleksandra J. Wierzba
- Institute of Organic ChemistryPolish Academy of SciencesKasprzaka 44/5201-224WarsawPoland
| | - Josef Kapitán
- Department of OpticsPalacký University Olomouc17. listopadu 1277146OlomoucCzech Republic
| | - Tadeusz Andruniów
- Department of ChemistryWroclaw University of Science and TechnologyWyb. Wyspianskiego 2750-370WroclawPoland
| | - Maciej Spiegel
- Department of Pharmacognosy and Herbal MedicineWroclaw Medical UniversityBorowska 211A50-556WroclawPoland
| | - Dorota Gryko
- Institute of Organic ChemistryPolish Academy of SciencesKasprzaka 44/5201-224WarsawPoland
| | - Petr Bouř
- Institute of Organic Chemistry and BiochemistryAcademy of SciencesFlemingovo náměstí 216610PragueCzech Republic
| | - Malgorzata Baranska
- Faculty of ChemistryJagiellonian UniversityGronostajowa 230-387KrakowPoland
- Jagiellonian Centre for Experimental Therapeutics (JCET)Jagiellonian UniversityBobrzynskiego 1430-348KrakowPoland
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17
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Rebizi MN, Sekkoum K, Petri A, Pescitelli G, Belboukhari N. Synthesis, enantioseparation, and absolute configuration assignment of iminoflavans by chiral high-performance liquid chromatography combined with online chiroptical detection. J Sep Sci 2021; 44:3551-3561. [PMID: 34351068 DOI: 10.1002/jssc.202100474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 07/29/2021] [Accepted: 07/29/2021] [Indexed: 11/09/2022]
Abstract
Four racemic iminoflavan derivatives were synthesized by simple condensation at C-4 position of flavanone. All new compounds were characterized by using ultraviolet-visible, infrared, and nuclear magnetic resonance spectroscopic techniques. A chiral chromatographic analysis of racemic mixtures was performed by direct chiral high-performance liquid chromatography using Chiralcel® OD-H as chiral stationary phase, and online-coupled with electronic circular dichroism detector. The correlation of experimental electronic circular dichroism traces with quantum chemical electronic circular dichroism calculations run with time-dependent density functional theory made it possible to elucidate the absolute configuration for each enantiomer, and to establish the elution order.
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Affiliation(s)
- Mohamed Nadjib Rebizi
- Bioactive Molecules and Chiral Separation Laboratory, University Tahri Mohamed of Bechar, Bechar, Algeria
| | - Khaled Sekkoum
- Bioactive Molecules and Chiral Separation Laboratory, University Tahri Mohamed of Bechar, Bechar, Algeria
| | - Antonella Petri
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Nasser Belboukhari
- Bioactive Molecules and Chiral Separation Laboratory, University Tahri Mohamed of Bechar, Bechar, Algeria
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18
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Li G, Alshalalfeh M, Yang Y, Cheeseman JR, Bouř P, Xu Y. Can One Measure Resonance Raman Optical Activity? Angew Chem Int Ed Engl 2021; 60:22004-22009. [PMID: 34347923 DOI: 10.1002/anie.202109345] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Indexed: 11/10/2022]
Abstract
Resonance Raman optical activity (RROA) is commonly measured as the difference in intensity of Raman scattered right and left circularly polarized light, IR -IL , when a randomly polarized light is in resonance with a chiral molecule. Strong and sometimes mono-signate experimental RROA spectra of several chiral solutes were reported previously, although their signs and relative intensities could not be reproduced theoretically. By examining multiple light-matter interaction events which can occur simultaneously under resonance, we show that a new form of chiral Raman spectroscopy, eCP-Raman, a combination of electronic circular dichroism and circularly polarized Raman, prevails. By incorporating the finite-lifetime approach for resonance, the experimental patterns of the model chiral solutes are captured theoretically by eCP-Raman, without any RROA contribution. The results open opportunity for applications of eCP-Raman spectroscopy and for extracting true RROA experimentally.
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Affiliation(s)
- Guojie Li
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - Mutasem Alshalalfeh
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - Yanqing Yang
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - James R Cheeseman
- Gaussian Inc., 340 Quinnipiac St., Bldg. 40, Wallingford, CT, 06492-4050, USA
| | - Petr Bouř
- Institute of Organic Chemistry and Biochemistry, Flemingovo náměstí 2, 16610, Prague, Czech Republic
| | - Yunjie Xu
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
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19
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Wen SS, Wang Y, Xu JP, Liu Q, Zhang L, Zheng J, Li L, Zhang N, Liu X, Xu YW, Sun ZL. Two new sesquiterpenoid lactone derivatives from Lindera aggregata. Nat Prod Res 2021; 36:5407-5415. [PMID: 34142619 DOI: 10.1080/14786419.2021.1939332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Two new sesquiterpenoid lactone derivatives, linderin A (1) and linderin B (2) comprising a sesquiterpenoid lactone and a methyl geranylhomogentisate moiety together with six known compounds were isolated from the roots of Lindera aggregata. Their chemical structures were elucidated using extensive spectroscopic analysis including 1 D, 2 D NMR, and HR-ESI-MS data and compared with previously reported data. The absolute configurations of 1 and 2 were assigned based on the electronic circular dichroism calculation. Compound 2 showed moderate anticoagulant activity.
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Affiliation(s)
- Song-Song Wen
- NMPA Key Laboratory for Research and Evaluation of Generic Drugs, Shandong Research Center of Engineering and Technology for Consistency Evaluation of Generic Drugs, Shandong Institute for Food and Drug Control, Jinan, China.,Key Laboratory of Chemical Biology of the Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, China
| | - Yan Wang
- Shanghai Putuo District Liqun Hospital, Shanghai, China
| | - Jia-Ping Xu
- NMPA Key Laboratory for Research and Evaluation of Generic Drugs, Shandong Research Center of Engineering and Technology for Consistency Evaluation of Generic Drugs, Shandong Institute for Food and Drug Control, Jinan, China
| | - Qi Liu
- NMPA Key Laboratory for Research and Evaluation of Generic Drugs, Shandong Research Center of Engineering and Technology for Consistency Evaluation of Generic Drugs, Shandong Institute for Food and Drug Control, Jinan, China
| | - Lei Zhang
- NMPA Key Laboratory for Research and Evaluation of Generic Drugs, Shandong Research Center of Engineering and Technology for Consistency Evaluation of Generic Drugs, Shandong Institute for Food and Drug Control, Jinan, China
| | - Jing Zheng
- NMPA Key Laboratory for Research and Evaluation of Generic Drugs, Shandong Research Center of Engineering and Technology for Consistency Evaluation of Generic Drugs, Shandong Institute for Food and Drug Control, Jinan, China
| | - Lin Li
- NMPA Key Laboratory for Research and Evaluation of Generic Drugs, Shandong Research Center of Engineering and Technology for Consistency Evaluation of Generic Drugs, Shandong Institute for Food and Drug Control, Jinan, China
| | - Na Zhang
- Key Laboratory of Chemical Biology of the Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan, China
| | - Xin Liu
- State Key Laboratory of Quality Research in Chinese Medicine, Macau Institute for Applied Research in Medicine and Health, Macau University of Science and Technology, Macau, People's Republic of China
| | - Yu-Wen Xu
- NMPA Key Laboratory for Research and Evaluation of Generic Drugs, Shandong Research Center of Engineering and Technology for Consistency Evaluation of Generic Drugs, Shandong Institute for Food and Drug Control, Jinan, China
| | - Zhen-Liang Sun
- Southern Medical University Affiliated Fengxian Hospital, Shanghai, China
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20
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Miclot T, Corbier C, Terenzi A, Hognon C, Grandemange S, Barone G, Monari A. Forever Young: Structural Stability of Telomeric Guanine Quadruplexes in the Presence of Oxidative DNA Lesions*. Chemistry 2021; 27:8865-8874. [PMID: 33871121 DOI: 10.1002/chem.202100993] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Indexed: 01/13/2023]
Abstract
Human telomeric DNA, in G-quadruplex (G4) conformation, is characterized by a remarkable structural stability that confers it the capacity to resist to oxidative stress producing one or even clustered 8-oxoguanine (8oxoG) lesions. We present a combined experimental/computational investigation, by using circular dichroism in aqueous solutions, cellular immunofluorescence assays and molecular dynamics simulations, that identifies the crucial role of the stability of G4s to oxidative lesions, related also to their biological role as inhibitors of telomerase, an enzyme overexpressed in most cancers associated to oxidative stress.
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Affiliation(s)
- Tom Miclot
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Università degli Studi di Palermo, Viale delle Scienze, 90128, Palermo, Italy.,Université de Lorraine and CNRS, LPCT UMR 7019, 54000, Nancy, France
| | - Camille Corbier
- Université de Lorraine and CNRS, CRAN UMR 7039, 54000, Nancy, France
| | - Alessio Terenzi
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Università degli Studi di Palermo, Viale delle Scienze, 90128, Palermo, Italy
| | - Cécilia Hognon
- Université de Lorraine and CNRS, LPCT UMR 7019, 54000, Nancy, France
| | | | - Giampaolo Barone
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, Università degli Studi di Palermo, Viale delle Scienze, 90128, Palermo, Italy
| | - Antonio Monari
- Université de Lorraine and CNRS, LPCT UMR 7019, 54000, Nancy, France
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21
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Abstract
The first investigation of chemical composition in seed kernels of Caesalpinia cucullata Roxb. resulted in the separation of four new cassane diterpenes, including three furanoditerpenes (1, 2 and 4) and one tricyclic type (3). It was the first found cassane diterpenoids from this plant. Their gross structures were elucidated by means of comprehensive spectroscopic analysis (UV, IR, NMR, HRESIMS) as well as electronic circular dichroism (ECD) calculation. The compound 1 possess a rare isomerized dihydrofuran ring in structure framework. In bioassay, compounds 1-4 exhibited moderate anti-inflammatory activity by inhibiting production of NO in LPS-induced RAW 264.7 cells.
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Affiliation(s)
- Miao Wang
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Tianliang Zhu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Siyu Yu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Ting Liu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Bei Zhou
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Huiyuan Gao
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
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22
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Liu G, Huo R, Zhai Y, Liu L. New Bioactive Sesquiterpeniods From the Plant Endophytic Fungus Pestalotiopsis theae. Front Microbiol 2021; 12:641504. [PMID: 33868199 PMCID: PMC8044550 DOI: 10.3389/fmicb.2021.641504] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 03/09/2021] [Indexed: 12/03/2022] Open
Abstract
Three new secondary metabolites pestalothenins A-C (1-3), including two new humulane-derived sesquiterpeniods (1 and 2) and one new caryophyllene-derived sesquiterpeniod (3), together with five known compounds (4-8) were isolated from the crude extract of the plant endophytic fungus Pestalotiopsis theae (N635). Their structures were elucidated by the extensive analyses of HRESIMS and NMR spectroscopic data. The absolute configurations of 1-3 were determined by comparison of experimental and calculated electronic circular dichroism (ECD) spectra. The cytotoxic effects of these compounds were evaluated in vitro. Compound 6 showed moderate cytotoxicity against T24 and MCF7 cell lines. In addition, compounds 1-8 were also evaluated for antibacterial activity.
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Affiliation(s)
- Gaoran Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Ruiyun Huo
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Yanan Zhai
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Ling Liu
- State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
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23
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Liu T, Li X, Ning Z, Qi S, Gao H. Two new cassane-type diterpenoids from the seed kernels of Caesalpinia bonduc (Linn.) Roxb. and their anti-inflammatory activity. Nat Prod Res 2021; 36:3901-3908. [PMID: 33663272 DOI: 10.1080/14786419.2021.1896511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
In this study, phytochemical investigation on the chloroform soluble fraction of seed kernels of Caesalpinia bonduc led to the isolation of two new cassane-type diterpenoids, norcaesalpinin Q (1) and caesalpinin MR (2), together with seven known compounds (3-9). The structures of the new compounds were elucidated on the basis of extensive NMR spectroscopic and mass spectrometric analyses, and their absolute configurations were determined by electronic circular dichroism (ECD) calculations. All compounds were evaluated for inhibitory effects against NO production of RAW264.7 cells induced by LPS, and compounds 5, 7 and 8 could inhibited the production of NO at the concentration of 50 µM.
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Affiliation(s)
- Ting Liu
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Xiang Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Zunxi Ning
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Shizhou Qi
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
| | - Huiyuan Gao
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, People's Republic of China.,Key Laboratory of Structure-Based Drug Design & Discovery of Ministry of Education, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
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24
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Johnson JL, Santoro E, Zatout R, Petrovic AG, Cimmino A, Superchi S, Evidente A, Berova ND, Polavarapu PL. Absolute configuration of seco-eudesmanolide inuloxin D from experimental and predicted chiroptical studies of its 4-O-acetyl derivative. Chirality 2021; 33:233-241. [PMID: 33598968 DOI: 10.1002/chir.23301] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/05/2021] [Accepted: 02/08/2021] [Indexed: 12/12/2022]
Abstract
Sesquitepenoids inuloxins A-D, belonging to different subgroups, were isolated from Dittrichia viscosa and showed potential biocontrol of some parasitic plants as Pelipanche, Orobanche, and Cuscuta species. The absolute configurations of the first three inuloxins A-C were previously determined by using experimental and computational chiroptical spectroscopic methods. The absolute configuration of inuloxin D remains to be established. The bioactive inuloxin E, closely related to inuloxin D, was recently isolated from the same plant organic extract. The same relative configuration of inuloxin D was assigned to inuloxin E by comparison of their NMR spectroscopic data. The absolute configurations of inuloxin D and inuloxin E are suggested in this work by analysis of the experimental and predicted chiroptical properties of the 4-O-acetyl derivative of inuloxin D.
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Affiliation(s)
- Jordan L Johnson
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Ernesto Santoro
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Roukia Zatout
- Department of chemical Sciences, University of Naples Federico II, Naples, Italy.,Laboratoire de Mycologie, de Biotechnologie et de l'Activité Microbienne (LaMyBAM), Département de Biologie Appliquée, Université des Frères Mentouri, Constantine, Algeria
| | - Ana G Petrovic
- Department of Chemical and Biological Sciences, New York Institute of Technology, New York, New York, USA
| | - Alessio Cimmino
- Department of chemical Sciences, University of Naples Federico II, Naples, Italy
| | | | - Antonio Evidente
- Department of chemical Sciences, University of Naples Federico II, Naples, Italy
| | - Nina D Berova
- Department of Chemistry, Columbia University, New York, New York, USA
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25
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Wu T, Li G, Kapitán J, Kessler J, Xu Y, Bouř P. Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity. Angew Chem Int Ed Engl 2020; 59:21895-21898. [PMID: 32926516 PMCID: PMC7894312 DOI: 10.1002/anie.202011146] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Indexed: 12/19/2022]
Abstract
Previously, we and other laboratories have reported an unusual and strong Raman optical activity (ROA) induced in solvents by chiral dyes. Various theories of the phenomenon appeared, but they were not capable of explaining fully the observed ROA band signs and intensities. In this work, an analysis based both on the light scattering theory and dedicated experiments provides a more complete understanding. For example, double-cell magnetic circular dichroism and magnetic ROA experiments with copper-porphyrin complex show that the induced chirality is observed without any contact of the solvents with the complex. The results thus indicate that a combination of electronic circular dichroism (ECD) with the polarized Raman scattering is responsible for the effect. The degree of circularity of solvent vibrational bands is a principal molecular property participating in the event. The insight and the possibility to predict the chirality transfer promise future applications in spectroscopy, chemical analysis and polarized imaging.
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Affiliation(s)
- Tao Wu
- Institute of Organic Chemistry and BiochemistryFlemingovo náměstí 216610PragueCzech Republic
| | - Guojie Li
- Department of ChemistryUniversity of AlbertaEdmontonAlbertaT6G 2G2Canada
| | - Josef Kapitán
- Department of OpticsPalacký University Olomouc17. listopadu 1277146OlomoucCzech Republic
| | - Jiří Kessler
- Institute of Organic Chemistry and BiochemistryFlemingovo náměstí 216610PragueCzech Republic
| | - Yunjie Xu
- Department of ChemistryUniversity of AlbertaEdmontonAlbertaT6G 2G2Canada
| | - Petr Bouř
- Institute of Organic Chemistry and BiochemistryFlemingovo náměstí 216610PragueCzech Republic
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26
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Li T, Ma X, Fedotov D, Kjaerulff L, Frydenvang K, Coriani S, Hansen PR, Kongstad KT, Staerk D. Structure Elucidation of Prenyl- and Geranyl-Substituted Coumarins in Gerbera piloselloides by NMR Spectroscopy, Electronic Circular Dichroism Calculations, and Single Crystal X-ray Crystallography. Molecules 2020; 25:E1706. [PMID: 32276427 DOI: 10.3390/molecules25071706] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 03/30/2020] [Accepted: 04/02/2020] [Indexed: 11/17/2022] Open
Abstract
Crude ethyl acetate extract of Gerbera piloselloides (L.) Cass. was investigated by dual high-resolution PTP1B/α-glucosidase inhibition profiling and LC-PDA-HRMS. This indicated the presence of a series of unprecedented prenyl- and geranyl-substituted coumarin derivatives correlated with both α-glucosidase and PTP1B inhibitory activity. Repeated chromatographic separation targeting these compounds led to the isolation of 13 new compounds, of which ten could be isolated as both enantiomers after chiral separation. The structures of all isolated compounds were characterized by HRMS and extensive 1D and 2D NMR analysis. The absolute configurations of the isolated compounds were determined by comparison of experimental and calculated electronic circular dichroism spectra. Compound 6 features a rare furan-oxepane 5/7 ring system, possibly formed through addition of a geranyl unit to C-3 of 5-methylcoumarin, representing a new type of geranyl-substituted coumarin skeleton. Compounds 19 and 24 are the first examples of dimeric natural products consisting of both coumarin and chromone moieties.
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27
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Peng ZT, Chao LH, Wang CC, Xia H, Liu DF, Wang ZW, Zheng J, Zhao YF, Tu PF, Li J. [A new nor-sesquiterpene glycoside from Corydalis edulis]. Zhongguo Zhong Yao Za Zhi 2020; 45:579-583. [PMID: 32237516 DOI: 10.19540/j.cnki.cjcmm.20191104.202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study is to investigate the chemical constituents from the whole plant Corydalis edulis. The chemical constituents were separated and purified by macroporous resin D101, silica gel, Sephadex LH-20, ODS, and semi-preparative HPLC. Their structures were determined by physicochemical properties and spectroscopic data. Four compounds were isolated from the dichloromethane and water extracts of the whole plant C. edulis, and identified as 6'-β-D-xylosylicariside B2(1),(3S,5R,6S,7E)-5,6-epoxy-3-hydroxy-7-megastigmen-9-one(2), loliolide(3), and 5,5'-dimethoxybiphenyl-2,2'-diol(4), respectively. Compound 1 is a new compound, of which the absolute configuration was established by electronic circular dichroism(ECD) calculations. Compound 4 is obtained from the plants of Papaveraceae family for the first time. Compounds 2 and 3 are firstly isolated from the Corydalis genus.
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Affiliation(s)
- Zhi-Tian Peng
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
| | - Ling-Hui Chao
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
| | - Chao-Chao Wang
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
| | - Hui Xia
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
| | - Di-Fa Liu
- State Key Laboratory of Innovative Natural Medicine and Traditional Chinese Medicine Injections, Jiangxi Qingfeng Pharmaceutical Co., Ltd. Ganzhou 341000, China
| | - Zhang-Wei Wang
- State Key Laboratory of Innovative Natural Medicine and Traditional Chinese Medicine Injections, Jiangxi Qingfeng Pharmaceutical Co., Ltd. Ganzhou 341000, China
| | - Jiao Zheng
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
| | - Yun-Fang Zhao
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
| | - Peng-Fei Tu
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
| | - Jun Li
- Modern Research Center for Traditional Chinese Medicine, School of Chinese Materia Medica, Beijing University of Chinese Medicine Beijing 100029, China
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28
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Tran-Cong NM, Mándi A, Király SB, Kurtán T, Lin W, Liu Z, Proksch P. Furoic acid derivatives from the endophytic fungus Coniothyrium sp. Chirality 2020; 32:605-610. [PMID: 32115775 DOI: 10.1002/chir.23209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 01/19/2020] [Accepted: 02/17/2020] [Indexed: 11/06/2022]
Abstract
The endophytic fungus Coniothyrium sp. was isolated from leaves of Quercus robur. Fermentation of this fungus on solid rice medium yielded two new furoic acid derivatives (1 and 2) and two additional known compounds. The structures of the new compounds were determined by extensive analysis of 1D and 2D nuclear magnetic resonance spectra as well as high-resolution mass spectrometry data. Compound 1, containing three aromatic chromophores attached by rotatable sigma bonds and a chirality center in benzylic position, was found to be a scalemic mixture with an excess of the (S) enantiomer, the absolute configuration of which was elucidated as by the solution time-dependent density functional theory-electronic circular dichroism approach. The ωB97X/TZVP PCM/MeCN and SOGGA11-X/TZVP SMD/MeCN methods were used for geometry reoptimization to reproduce the solution conformational ensemble. All isolated compounds were tested for their cytotoxicity but proved to be inactive.
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Affiliation(s)
- Nam Michael Tran-Cong
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | | | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, Debrecen, Hungary
| | - Wenhan Lin
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing, China
| | - Zhen Liu
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | - Peter Proksch
- Institute of Pharmaceutical Biology and Biotechnology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
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Bae M, An JS, Hong SH, Bae ES, Chung B, Kwon Y, Hong S, Oh KB, Shin J, Lee SK, Oh DC. Donghaecyclinones A-C: New Cytotoxic Rearranged Angucyclinones from a Volcanic Island-Derived Marine Streptomyces sp. Mar Drugs 2020; 18:md18020121. [PMID: 32085561 PMCID: PMC7073551 DOI: 10.3390/md18020121] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/08/2020] [Accepted: 02/10/2020] [Indexed: 12/14/2022] Open
Abstract
Chemical profiling of the Streptomyces sp. strain SUD119, which was isolated from a marine sediment sample collected from a volcanic island in Korea, led to the discovery of three new metabolites: donghaecyclinones A–C (1–3). The structures of 1–3 were found to be rearranged, multicyclic, angucyclinone-class compounds according to nuclear magnetic resonance (NMR) and mass spectrometry (MS) analyses. The configurations of their stereogenic centers were successfully assigned using a combination of quantum mechanics–based computational methods for calculating the NMR shielding tensor (DP4 and CP3) as well as electronic circular dichroism (ECD) along with a modified version of Mosher’s method. Donghaecyclinones A–C (1–3) displayed cytotoxicity against diverse human cancer cell lines (IC50: 6.7–9.6 μM for 3).
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Affiliation(s)
- Munhyung Bae
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
| | - Joon Soo An
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
| | - Seong-Heon Hong
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
| | - Eun Seo Bae
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
| | - Beomkoo Chung
- Department of Agricultural Biotechnology, College of Agriculture & Life Sciences, Seoul National University, Seoul 08826, Korea; (B.C.); (K.-B.O.)
| | - Yun Kwon
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
| | - Suckchang Hong
- Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, Seoul 08826, Korea;
| | - Ki-Bong Oh
- Department of Agricultural Biotechnology, College of Agriculture & Life Sciences, Seoul National University, Seoul 08826, Korea; (B.C.); (K.-B.O.)
| | - Jongheon Shin
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
| | - Sang Kook Lee
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
| | - Dong-Chan Oh
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 08826, Korea; (M.B.); (J.S.A.); (S.-H.H.); (E.S.B.); (Y.K.); (J.S.); (S.K.L.)
- Correspondence: ; Tel.: +82-2880-2491
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30
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Marvilliers A, Illien B, Gros E, Sorres J, Kashmann Y, Thomas H, Smadja J, Gauvin-Bialecki A. Modified Clerodanes from the Essential Oil of Dodonea viscosa Leaves. Molecules 2020; 25:E850. [PMID: 32075135 DOI: 10.3390/molecules25040850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/07/2020] [Accepted: 02/11/2020] [Indexed: 11/16/2022] Open
Abstract
Dodonea viscosa (L.) Jacq from Reunion Island (Indian Ocean) was investigated for its leaf essential oil composition. The plant was extracted by hydrodistillation and its essential oil analysed by gas chromatography coupled to mass spectrometry. This study revealed that oxygenated nor-diterpenes and diterpenes were one of the major chemical classes (> 50%) mainly consisting of three modified cyclopropylclerodanes containing a bicyclo[5.4.0]undecane ring system: one new furanoid norditerpene, dodovisate C, and two furanoid diterpenes, the known methyl dodovisate A and the new methyl iso-dodovisate A. These three compounds were isolated by liquid chromatography and their structures established on the basis of spectroscopic studies. The absolute configuration of dodovisate C was elucidated through a joint experimental and theoretical (B3LYP/6-311+G(d,p)) electronic circular dichroism study. The relative configurations of methyl dodovisate A and methyl iso-dodovisate A were determined using linear regressions of theoretical chemical shifts versus experimental values with the (B3LYP/6-311+G(d,p)) method.
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Línzembold I, Czett D, Böddi K, Kurtán T, Király SB, Gulyás-Fekete G, Takátsy A, Lóránd T, Deli J, Agócs A, Nagy V. Study on the Synthesis, Antioxidant Properties, and Self-Assembly of Carotenoid-Flavonoid Conjugates. Molecules 2020; 25:E636. [PMID: 32024181 PMCID: PMC7038153 DOI: 10.3390/molecules25030636] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 01/28/2020] [Accepted: 01/29/2020] [Indexed: 11/23/2022] Open
Abstract
Flavonoids and carotenoids possess beneficial physiological effects, such as high antioxidant capacity, anticarcinogenic, immunomodulatory, and anti-inflammatory properties, as well as protective effects against UV light. The covalent coupling of hydrophobic carotenoids with hydrophilic flavonoids, such as daidzein and chrysin, was achieved, resulting in new amphipathic structures. 7-Azidohexyl ethers of daidzein and chrysin were prepared in five steps, and their azide-alkyne [4 + 2] cycloaddition with pentynoates of 8'-apo-β-carotenol, zeaxanthin, and capsanthin afforded carotenoid-flavonoid conjugates. The trolox-equivalent antioxidant capacity against ABTS•+ radical cation and self-assembly of the final products were examined. The 1:1 flavonoid-carotenoid hybrids generally showed higher antioxidant activity than their parent flavonoids but lower than that of the corresponding carotenoids. The diflavonoid hybrids of zeaxanthin and capsanthin, however, were found to exhibit a synergistic enhancement in antioxidant capacities. ECD (electronic circular dichroism) and UV-vis analysis of zeaxanthin-flavonoid conjugates revealed that they form different optically active J-aggregates in acetone/water and tetrahydrofuran/water mixtures depending on the solvent ratio and type of the applied aprotic polar solvent, while the capsanthin derivatives showed no self-assembly. The zeaxanthin bis-triazole conjugates with daidzein and with chrysin, differing only in the position of a phenolic hydroxyl group, showed significantly different aggregation profile upon the addition of water.
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Affiliation(s)
- Ildikó Línzembold
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
| | - Dalma Czett
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
| | - Katalin Böddi
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary; (T.K.); (S.B.K.)
| | - Sándor Balázs Király
- Department of Organic Chemistry, University of Debrecen, POB 400, H-4002 Debrecen, Hungary; (T.K.); (S.B.K.)
| | - Gergely Gulyás-Fekete
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
| | - Anikó Takátsy
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
| | - Tamás Lóránd
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
| | - József Deli
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
- Department of Pharmacognosy, University of Pécs, Faculty of Pharmacy, Rókus u. 2, H-7624 Pécs, Hungary
| | - Attila Agócs
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
| | - Veronika Nagy
- Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, Szigeti út 12, H-7624 Pécs, Hungary; (I.L.); (D.C.); (K.B.); (G.G.-F.); (A.T.); (T.L.); (J.D.); (A.A.)
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32
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Huang L, Ding L, Li X, Wang N, Cui W, Wang X, Naman CB, Lazaro JEH, Yan X, He S. New Dihydroisocoumarin Root Growth Inhibitors From the Sponge-Derived Fungus Aspergillus sp. NBUF87. Front Microbiol 2019; 10:2846. [PMID: 31921029 PMCID: PMC6914834 DOI: 10.3389/fmicb.2019.02846] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 11/25/2019] [Indexed: 12/22/2022] Open
Abstract
Six new dihydroisocoumarins, aspergimarins A-F (1-6), were discovered together with five known analogs (7-11) from a monoculture of the sponge-derived fungus Aspergillus sp. NBUF87. The structures of these compounds were elucidated through comprehensive spectroscopic methods, and absolute configurations were assigned after X-ray crystallography, use of the modified Mosher's method, and comparison of electronic circular dichroism (ECD) data with literature values for previously reported analogs. Compounds 1-11 were evaluated in a variety of bioassays, and at 100 μM, both 1 and 5 showed significant inhibitory effects on the lateral root growth of Arabidopsis thaliana Columbia-0 (Col-0). Moreover, at 100 μM, 5 also possessed notable inhibition against the primary root growth of Col-0. Meanwhile, 1-11 were all found to be inactive in vitro against acetylcholinesterase (AChE) (IC50 > 100 μM), four different types of human-derived cancer cell lines (IC50 > 50 μM), as well as methicillin-resistant Staphylococcus aureus and Escherichia coli (MIC > 50 μg/mL), and Plasmodium falciparum W2 (EC50 > 100 μg/mL), in phenotypic tests.
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Affiliation(s)
- Liming Huang
- Li Dak Sum Yip Yio Chin Kenneth Li Marine Biopharmaceutical Research Center, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Lijian Ding
- Li Dak Sum Yip Yio Chin Kenneth Li Marine Biopharmaceutical Research Center, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Xiaohui Li
- Li Dak Sum Yip Yio Chin Kenneth Li Marine Biopharmaceutical Research Center, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Ning Wang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, China
| | - Wei Cui
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, China
| | - Xiao Wang
- Zhejiang Provincial Key Laboratory of Pathophysiology, School of Medicine, Ningbo University, Ningbo, China
| | - C. Benjamin Naman
- Li Dak Sum Yip Yio Chin Kenneth Li Marine Biopharmaceutical Research Center, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States
| | - J. Enrico H. Lazaro
- National Institute of Molecular Biology and Biotechnology, University of the Philippines Diliman, Quezon, Philippines
| | - Xiaojun Yan
- Li Dak Sum Yip Yio Chin Kenneth Li Marine Biopharmaceutical Research Center, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
| | - Shan He
- Li Dak Sum Yip Yio Chin Kenneth Li Marine Biopharmaceutical Research Center, College of Food and Pharmaceutical Sciences, Ningbo University, Ningbo, China
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Weiss R, Aubert E, Peluso P, Cossu S, Pale P, Mamane V. Chiral Chalcogen Bond Donors Based on the 4,4'-Bipyridine Scaffold. Molecules 2019; 24:E4484. [PMID: 31817814 DOI: 10.3390/molecules24244484] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 11/29/2019] [Accepted: 12/03/2019] [Indexed: 02/06/2023] Open
Abstract
Organocatalysis through chalcogen bonding (ChB) is in its infancy, as its proof-of-principle was only reported in 2016. Herein, we report the design and synthesis of new chiral ChB donors, as well as the catalytic activity evaluation of the 5,5′-dibromo-2,2′-dichloro-3-((perfluorophenyl)selanyl)-4,4′-bipyridine as organocatalyst. The latter is based on the use of two electron-withdrawing groups, a pentafluorophenyl ring and a tetrahalo-4,4′-bipyridine skeleton, as substituents at the selenium center. Atropisomery of the tetrahalo-4,4′-bipyridine motif provides a chiral environment to these new ChB donors. Their synthesis was achieved through either selective lithium exchange and trapping or a site-selective copper-mediated reaction. Pure enantiomers of the 3-selanyl-4,4′-bipyridine were obtained by high performance liquid chromatography enantioseparation on specific chiral stationary phase, and their absolute configuration was assigned by comparison of the measured and calculated electronic circular dichroism spectra. The capability of the selenium compound to participate in σ-hole-based interactions in solution was studied by 19F NMR. Even if no asymmetric induction has been observed so far, the new selenium motif proved to be catalytically active in the reduction of 2-phenylquinoline by Hantzsch ester.
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Jimenez DEQ, Barreiro JC, Dos Santos FM, de Vasconcellos SP, Porto ALM, Batista JM. Enantioselective ene-reduction of E-2-cyano-3-(furan-2-yl) acrylamide by marine and terrestrial fungi and absolute configuration of (R)-2-cyano-3-(furan-2-yl) propanamide determined by calculations of electronic circular dichroism (ECD) spectra. Chirality 2019; 31:534-542. [PMID: 31197903 DOI: 10.1002/chir.23078] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 11/07/2022]
Abstract
This work reports the green organic chemistry synthesis of E-2-cyano-3(furan-2-yl) acrylamide under microwave radiation (55 W), as well as the use of filamentous marine and terrestrial-derived fungi, in the first ene-reduction of 2-cyano-3-(furan-2-yl) acrylamide to (R)-2-cyano-3-(furan-2-yl)propanamide. The fungal strains screened included Penicillium citrinum CBMAI 1186, Trichoderma sp. CBMAI 932 and Aspergillus sydowii CBMAI 935, and the filamentous terrestrial fungi Aspergillus sp. FPZSP 146 and Aspergillus sp. FPZSP 152. A compound with an uncommon CN-bearing stereogenic center at the α-C position was obtained by enantioselective reactions mediated in the presence of the microorganisms yielding the (R)-2-cyano-3-(furan-2-yl) propanamide 3a. Its isolated yield and e.e. ranged from 86% to 98% and 39% to 99%, respectively. The absolute configuration of the biotransformation products was determined by time-dependent density functional theory (TD-DFT) calculations of electronic circular dichroism (ECD) spectra. Finally, the tautomerization of 2-cyano-3-(furan-2-yl) propanamide 3a to form an achiral ketenimine was observed and investigated in presence of protic solvents.
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Affiliation(s)
- David E Q Jimenez
- Departamento de Química, Universidade Federal do Amapá, Macapá, Brazil.,Laboratório de Química Orgânica e Biocatálise, Instituto de Química de São Carlos, Universidade de São Paulo - USP, São Carlos, Brazil
| | - Juliana C Barreiro
- Laboratório de Química Orgânica e Biocatálise, Instituto de Química de São Carlos, Universidade de São Paulo - USP, São Carlos, Brazil
| | - Fernando M Dos Santos
- Departamento de Química Orgânica, Instituto de Química, Universidade Federal Fluminense, Niterói, Brazil
| | - Suzan P de Vasconcellos
- Departamento de Ciências Farmacêuticas, Universidade Federal de São Paulo-UNIFESP, Diadema, Brazil
| | - André L M Porto
- Laboratório de Química Orgânica e Biocatálise, Instituto de Química de São Carlos, Universidade de São Paulo - USP, São Carlos, Brazil
| | - João M Batista
- Instituto de Ciência e Tecnologia, Universidade Federal de São Paulo-UNIFESP, São José dos Campos, Brazil
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35
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George J, Kar S, Anupriya ES, Somasundaran SM, Das AD, Sissa C, Painelli A, Thomas KG. Chiral Plasmons: Au Nanoparticle Assemblies on Thermoresponsive Organic Templates. ACS Nano 2019; 13:4392-4401. [PMID: 30916934 DOI: 10.1021/acsnano.8b09624] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Template-assisted strategies are widely used to fabricate nanostructured materials. By taking these strategies a step forward, herein we report the design of two chiral plasmonic nanostructures based on Au nanoparticle (NP) assemblies organized in clockwise and anticlockwise directions, having opposite response to circularly polarized light. The chiral plasmonic nanostructures are obtained by growing Au NPs on chiral templates based on d- and l-forms of alanine functionalized phenyleneethynylenes. Interestingly, Au NP assemblies show mirror symmetrical electronic circular dichroism (ECD) bands at their surface plasmon frequency originating through their asymmetric organization. Upon increasing the temperature, the chiral templates dissociate as evident from the disappearance of their ECD signal. The profound advantage of the thermoresponsive nature of the templates is employed to obtain free-standing chiral plasmonic nanostructures. The tilt angle high-resolution transmission electron microscopic measurements indicate that the NP assemblies, grown on a template based on the d-isomer, organize in clockwise direction ( P-form) and on l-isomer in anticlockwise direction ( M-form). The inherent chirality prevailing on the surface of the template drives the helical growth of the Au NPs in opposite directions. Experimental results are rationalized by a model which accounts for the large polarizability of Au NPs. The large polarizability leads to large oscillating dipole moments whose effects become prominent when interparticle distances are comparable to the particle size.
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Affiliation(s)
- Jino George
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , Vithura , Thiruvananthapuram 695 551 , India
- CSIR - National Institute for Interdisciplinary Science and Technology , Trivandrum , Kerala 695 019 , India
| | - Sabnam Kar
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , Vithura , Thiruvananthapuram 695 551 , India
| | - Edappalil Satheesan Anupriya
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , Vithura , Thiruvananthapuram 695 551 , India
| | - Sanoop Mambully Somasundaran
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , Vithura , Thiruvananthapuram 695 551 , India
| | - Anjali Devi Das
- CSIR - National Institute for Interdisciplinary Science and Technology , Trivandrum , Kerala 695 019 , India
| | - Cristina Sissa
- Department of Chemistry, Life Sciences, and Environmental Sustainability , University of Parma , 43124 Parma , Italy
| | - Anna Painelli
- Department of Chemistry, Life Sciences, and Environmental Sustainability , University of Parma , 43124 Parma , Italy
| | - K George Thomas
- School of Chemistry , Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM) , Vithura , Thiruvananthapuram 695 551 , India
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Xiong F, Yang BB, Zhang J, Li L. Enantioseparation, Stereochemical Assignment and Chiral Recognition Mechanism of Sulfoxide-Containing Drugs. Molecules 2018; 23:molecules23102680. [PMID: 30340337 PMCID: PMC6222453 DOI: 10.3390/molecules23102680] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 10/04/2018] [Accepted: 10/15/2018] [Indexed: 01/11/2023] Open
Abstract
The distinct pharmacodynamic and pharmacokinetic properties of enantiopure sulfoxide drugs have stimulated us to systematically investigate their chiral separation, stereochemical assignment, and chiral recognition mechanism. Herein, four clinically widely-used sulfoxide drugs were chosen and optically resolved on various chiral stationary phases (CSPs). Theoretical simulations including electronic circular dichroism (ECD) calculation and molecular docking were adopted to assign the stereochemistry and reveal the underlying chiral recognition mechanism. Our results showed that the sequence of calculated mean binding energies between each pair of enantiomers and CSP matched exactly with experimentally observed enantiomeric elution order (EEO). It was also found that the length of hydrogen bond might contribute dominantly the interaction between two enantiomers and CSP. We hope our study could provide a fresh perspective to explore the stereochemistry and chiral recognition mechanism of chiral drugs.
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Affiliation(s)
- Fei Xiong
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Bei-Bei Yang
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Jie Zhang
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
| | - Li Li
- Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China.
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Pescitelli G. For a Correct Application of the CD Exciton Chirality Method: The Case of Laucysteinamide A. Mar Drugs 2018; 16:E388. [PMID: 30332852 PMCID: PMC6213868 DOI: 10.3390/md16100388] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 10/10/2018] [Accepted: 10/15/2018] [Indexed: 12/15/2022] Open
Abstract
The circular dichroism (CD) exciton chirality method (ECM) is a very popular approach for assigning the absolute configuration (AC) of natural products, thanks to its immediacy and ease of application. The sign of an exciton couplet (two electronic CD bands with opposite sign and similar intensity) can be directly correlated with the molecular stereochemistry, including the AC. However, a correct application of the ECM necessitates several prerequisites: knowledge of the molecular conformation; knowledge of transition moment direction; and preeminence of the exciton coupling mechanism with respect to other sources of CD signals. In recent years, by using quantum-chemical CD calculations, we have demonstrated that some previous applications of ECM were wrong or based on incorrect assumptions. In a recent publication of this journal (Mar. Drugs, 2017, 15(4), 121), the ECM was employed to assign the AC of a marine metabolite, laucysteinamide A. This is a further case of incorrect application of the method, where none of the aforementioned prerequisites is fully met. Using this example, we will discuss the criteria required for a correct application of the ECM.
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Affiliation(s)
- Gennaro Pescitelli
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124 Pisa, Italy.
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Ximenes VF, Morgon NH, Robinson de Souza A. Solvent-dependent inversion of circular dichroism signal in naproxen: An unusual effect! Chirality 2018; 30:1049-1053. [PMID: 29969152 DOI: 10.1002/chir.22988] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 04/20/2018] [Accepted: 05/19/2018] [Indexed: 11/12/2022]
Abstract
The electronic circular dichroism (ECD) spectra of naproxen enantiomers were studied as a function of solvents using experimental (circular dichroism) and theoretical (time-dependent density functional theory) approaches. The (R)- and (S)-naproxen enantiomers presented an unusual inversion in their ECD signals in the presence of ethanol and water when compared with polar aprotic solvents such as acetonitrile. From a practical point of view, these findings deserve great attention because these solvents are widely used for high-performance liquid chromatography analysis in quality control of chiral pharmaceutical drugs. This is particularly relevant to naproxen because the (S)-naproxen has anti-inflammatory properties, whereas (R)-naproxen is hepatotoxic. A time-dependent density functional theory computer simulation was conducted to investigate the signal inversion using the solvation model based on density, a reparameterization of polarized continuum model. Electronic circular dichroism signals of conformers were calculated by computer simulation and their contribution to the combined spectra obtained according to Boltzmann weighting. It was found that the experimentally observed ECD signal inversion can be associated with the minor or major contribution of different conformers of naproxen.
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Affiliation(s)
- Valdecir Farias Ximenes
- Department of Chemistry, School of Science, São Paulo State University, Bauru, São Paulo, Brazil
| | - Nelson Henrique Morgon
- Department of Physical Chemistry, Institute of Chemistry, Campinas State University, Campinas, São Paulo, Brazil
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Kozlov MI, Poddubnyy VV, Glebov IO. Calculation of the excited states properties of LH1 complex of Thermochromatium tepidum. J Comput Chem 2018; 39:1599-1606. [PMID: 29701316 DOI: 10.1002/jcc.25232] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 03/28/2018] [Accepted: 04/03/2018] [Indexed: 11/09/2022]
Abstract
Calculation of the excited states properties of pigment complexes is one of the key problems in the photosynthesis research. The excited states of LH1 complex of Thermochromatium tepidum were studied by means of the high-precision quantum chemistry methods. The influence of different parameters of the calculation procedure was examined. The optimal scheme of calculation was chosen by comparison of calculated results with the experimental data on absorption, electronic and magnetic circular dichroism spectra. The high importance of the account of the second excited states of bacteriochlorophylls and of site heterogeneity was shown. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Maxim I Kozlov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia, 119991
| | - Vladimir V Poddubnyy
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia, 119991
| | - Ilya O Glebov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia, 119991
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40
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Suvanto J, Tähtinen P, Valkamaa S, Engström MT, Karonen M, Salminen JP. Variability in Foliar Ellagitannins of Hippophaë rhamnoides L. and Identification of a New Ellagitannin, Hippophaenin C. J Agric Food Chem 2018; 66:613-620. [PMID: 29262676 DOI: 10.1021/acs.jafc.7b04834] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Berries of common sea-buckthorn (Hippophaë rhamnoides L.) are well-known and used for their bioactive components, and while there is a considerable amount of research on the leaves as well, their ellagitannins (ETs) have not been a prominent focus of research. We identified and quantified ten major hydrophilic polyphenols, all ETs, in H. rhamnoides leaves and compared their abundance between 58 plant individuals. Of these compounds, hippophaenin C was characterized as a new ellagitannin by various spectrometric methods. The total concentrations of ETs ranged from 42.5 mg g-1 dry weight (DW) to 109.1 mg g-1 DW between individual plants. Among the ETs, hippophaenin C, stachyurin, and casuarinin were on average the most abundant compounds. Sexes did not differ significantly, while cultivars showed variation in some ETs. These results suggest that H. rhamnoides leaves could be a potential and rich source of several ETs.
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Affiliation(s)
- Jussi Suvanto
- Natural Chemistry Research Group, Department of Chemistry, University of Turku , FI-20014, Turku, Finland
| | - Petri Tähtinen
- Natural Chemistry Research Group, Department of Chemistry, University of Turku , FI-20014, Turku, Finland
| | - Saku Valkamaa
- Natural Chemistry Research Group, Department of Chemistry, University of Turku , FI-20014, Turku, Finland
| | - Marica T Engström
- Natural Chemistry Research Group, Department of Chemistry, University of Turku , FI-20014, Turku, Finland
| | - Maarit Karonen
- Natural Chemistry Research Group, Department of Chemistry, University of Turku , FI-20014, Turku, Finland
| | - Juha-Pekka Salminen
- Natural Chemistry Research Group, Department of Chemistry, University of Turku , FI-20014, Turku, Finland
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Guo F, Tang Q, Xie J, Zhao L, Liu K, Liu W. Enantioseparation and identification for the rationalization of the environmental impact of 4 polychlorinated biphenyls. Chirality 2018; 30:475-483. [PMID: 29315818 DOI: 10.1002/chir.22811] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 07/12/2017] [Accepted: 07/18/2017] [Indexed: 12/29/2022]
Abstract
Polychlorinated biphenyls (PCBs) are harmful and persistent organic pollutants that have long been used in industrial manufacturing. Their persistence leads to accumulation in the food chain causing potential toxic effects. As 19 out of 78 of the chiral congeners have stable atropisomers at ambient temperature, we studied some typical enantiomers: PCB45, PCB95, PCB136, and PCB149. The chiral stationary phases OD-H and OJ-H were used for separation in analytic high-performance liquid chromatography (HPLC), as well as for collection in semi-preparative HPLC. The resolution was optimized with respect to n-hexane-based mobile phases, temperature, and flow rate. All pure enantiomers were recovered from semi-preparative HPLC within 15 minutes for practical purpose. Characterization of the absolute configurations were conducted with a combination of theoretical and experimental electronic circular dichroism measurements. The enantiomers of PCB45, PCB95, PCB136, and PCB149 proved to be eluted as R > S, S > R, R > S, and S > R, respectively. Molecular structures (eg, substituent groups) and properties (eg, bond lengths, bond angles, and dipole moments) were quantitatively analyzed to understand the toxicity effect of PCBs. In summary, we have developed a well-established methodology of collection and configuration identification for analogous PCB derivatives.
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Affiliation(s)
- Fangjie Guo
- MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Qiaozhi Tang
- MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Jingqian Xie
- MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Lu Zhao
- MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
| | - Kai Liu
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California
| | - Weiping Liu
- MOE Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, Zhejiang Province, China
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Raghavan V, Polavarapu PL. Specific optical rotation is a versatile tool for the identification of critical micelle concentration and micellar growth of tartaric acid-based diastereomeric amphiphiles. Chirality 2017; 29:836-846. [PMID: 28991388 DOI: 10.1002/chir.22767] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 08/14/2017] [Accepted: 08/29/2017] [Indexed: 11/09/2022]
Abstract
Four novel tartaric acid-based diastereomeric chiral amphiphiles, two being enantiomers of the other two, have been synthesized and investigated using chiroptical spectroscopic methods, along with tensiometry and dynamic light scattering experiments. We found that an inflection point in specific optical rotation (SOR) values at ~0.32 mM corresponds to the critical micelle concentration (CMC). The increase in magnitude of SOR values beyond CMC corresponds to the growth of aggregates. For enantiomers, oppositely signed SOR values were observed, ruling out the possibility for the presence of aggregation size mediated artefacts. SOR values did not exhibit concentration dependence for a chiral tartaric acid based non-aggregating analogue further establishing the absence of artefacts or anomalous interaction of tartaric acid based head group with solvent. Electronic circular dichroism spectra showed no significant changes in band positions or intensities with concentration. Due to the requirement for higher concentrations (~200 mM) needed to obtain vibrational circular dichroism spectra, these measurements are not found to be useful for studying concentration dependent properties of chiral amphiphiles.
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Affiliation(s)
- Vijay Raghavan
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA
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43
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Polavarapu PL. Determination of the Absolute Configurations of Chiral Drugs Using Chiroptical Spectroscopy. Molecules 2016; 21:molecules21081056. [PMID: 27529201 PMCID: PMC6273303 DOI: 10.3390/molecules21081056] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 08/02/2016] [Accepted: 08/04/2016] [Indexed: 02/07/2023] Open
Abstract
Chiroptical spectroscopy has emerged as a promising tool for the determination of absolute configurations and predominant conformations of chiral molecules in academic laboratories. This promise has led to the adaption of chiroptical spectroscopic methods as valuable tools in chiral drug discovery research programs of the pharmaceutical industry. Most major pharmaceutical companies have invested in in-house chiroptical spectroscopy applications and reported successful outcomes. In the context of continuously increasing applications of chiroptical spectroscopy for chiral molecular structure determination, a review of recent developments and applications for chiral drugs is presented in this manuscript.
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Hodecker M, Biczysko M, Dreuw A, Barone V. Simulation of Vacuum UV Absorption and Electronic Circular Dichroism Spectra of Methyl Oxirane: The Role of Vibrational Effects. J Chem Theory Comput 2016; 12:2820-33. [PMID: 27159495 PMCID: PMC5612404 DOI: 10.1021/acs.jctc.6b00121] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Vibrationally resolved one-photon absorption and electronic circular dichroism spectra of (R)-methyl oxirane were calculated with different electronic and vibronic models selecting, through an analysis of the convergence of the results, the best compromise between reliability and computational cost. Linear-response TD-DFT/CAM-B3LYP/SNST electronic computations in conjunction with the simple vertical gradient vibronic model were chosen and employed for systematic comparison with the available experimental data. Remarkable agreement between simulated and experimental spectra was achieved for both one-photon absorption and circular dichroism concerning peak positions, relative intensities, and general spectral shapes considering the computational efficiency of the chosen theoretical approach. The significant improvement of the results with respect to smearing of vertical electronic transitions by phenomenological Gaussian functions and the possible inclusion of solvent effects by polarizable continuum models at a negligible additional cost paves the route toward the simulation and analysis of spectral shapes of complex molecular systems in their natural environment.
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Affiliation(s)
- Manuel Hodecker
- Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
- Interdisciplinary Center for Scientific Computing, Heidelberg University, Im Neuenheimer Feld 368, 69120 Heidelberg, Germany
| | - Malgorzata Biczysko
- International Centre for Quantum and Molecular Structures, College of Sciences, Shanghai University, 99 Shangda Road, Shanghai, 200444 China
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific Computing, Heidelberg University, Im Neuenheimer Feld 368, 69120 Heidelberg, Germany
| | - Vincenzo Barone
- Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, Italy
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Pescitelli G, Bruhn T. Good Computational Practice in the Assignment of Absolute Configurations by TDDFT Calculations of ECD Spectra. Chirality 2016; 28:466-74. [PMID: 27098594 DOI: 10.1002/chir.22600] [Citation(s) in RCA: 342] [Impact Index Per Article: 42.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 03/03/2016] [Accepted: 03/05/2016] [Indexed: 01/10/2023]
Abstract
Quantum-mechanical calculations of chiroptical properties have rapidly become the most popular method for assigning absolute configurations (AC) of organic compounds, including natural products. Black-box time-dependent Density Functional Theory (TDDFT) calculations of electronic circular dichroism (ECD) spectra are nowadays readily accessible to nonexperts. However, an uncritical attitude may easily deliver a wrong answer. We present to the Chirality Forum a discussion on what can be called good computational practice in running TDDFT ECD calculations, highlighting the most crucial points with several examples from the recent literature. Chirality 28:466-474, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Gennaro Pescitelli
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Pisa, Italy
| | - Torsten Bruhn
- Institut für Organische Chemie, Universität Würzburg Am Hubland, Würzburg, Germany
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46
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Dai P, Jiang N, Tan RX. Assignment of absolute stereostructures through quantum mechanics electronic and vibrational circular dichroism calculations. J Asian Nat Prod Res 2016; 18:72-91. [PMID: 26880597 DOI: 10.1080/10286020.2015.1134502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 12/16/2015] [Indexed: 06/05/2023]
Abstract
Elucidation of absolute configuration of chiral molecules including structurally complex natural products remains a challenging problem in organic chemistry. A reliable method for assigning the absolute stereostructure is to combine the experimental circular dichroism (CD) techniques such as electronic and vibrational CD (ECD and VCD), with quantum mechanics (QM) ECD and VCD calculations. The traditional QM methods as well as their continuing developments make them more applicable with accuracy. Taking some chiral natural products with diverse conformations as examples, this review describes the basic concepts and new developments of QM approaches for ECD and VCD calculations in solution and solid states.
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Affiliation(s)
- Peng Dai
- a State Key Laboratory of Pharmaceutical Biotechnology, Institute of Functional Biomolecules , Nanjing University , Nanjing 210093 , China
| | - Nan Jiang
- b School of Pharmacy , Nanjing University , Nanjing 210029 , China
| | - Ren-Xiang Tan
- a State Key Laboratory of Pharmaceutical Biotechnology, Institute of Functional Biomolecules , Nanjing University , Nanjing 210093 , China
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47
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Lin JC, Glover ZK, Sreedhara A. Assessing the Utility of Circular Dichroism and FTIR Spectroscopy in Monoclonal-Antibody Comparability Studies. J Pharm Sci 2015; 104:4459-4466. [PMID: 26505267 DOI: 10.1002/jps.24683] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2015] [Revised: 09/01/2015] [Accepted: 09/21/2015] [Indexed: 01/06/2023]
Abstract
Protein characterization is a necessary activity during development, technical transfers, and licensure. One important aspect of protein characterization is higher order structure assessment, which can be accomplished in a variety of ways. Circular dichroism (CD) and Fourier transform infrared (FTIR) spectroscopies provide global higher order structure and are routinely used to measure the overall structure for product characterization; however, their use as comparability tools is uncertain because of their insensitivity to local or small structure changes. We use a monoclonal antibody (mAb) to explore the usefulness of CD and FTIR compared with other indirect methods of structure characterization such as size-exclusion and ion-exchange chromatographies (SEC and IEC). A panel of degraded samples of a mAb was generated; their higher order structure evaluated using CD and FTIR and was found to be largely unchanged. However, the SEC and IEC chromatograms of certain degraded samples were found to have measurable changes. Based on these studies, we conclude that the application of CD and FTIR should be reserved for global higher order structure identification or product characterization only. The use of CD or FTIR comparability of mAbs should be carefully evaluated, as comparability can be sensitively determined using indirect methods based on chromatography.
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Affiliation(s)
- Jasper C Lin
- Late Stage Pharmaceutical Development, Genentech, South San Francisco, California 94080.
| | - Zephania Kwong Glover
- Late Stage Pharmaceutical Development, Genentech, South San Francisco, California 94080
| | - Alavattam Sreedhara
- Late Stage Pharmaceutical Development, Genentech, South San Francisco, California 94080
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48
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Evidente M, Boari A, Vergura S, Cimmino A, Vurro M, Ash G, Superchi S, Evidente A. Structure and Absolute Configuration of Kongiidiazadione, a New Phytotoxic 3-Substituted-5-Diazenylcyclopentendione Produced by Diaporthe Kongii. Chirality 2015; 27:557-62. [PMID: 26011252 DOI: 10.1002/chir.22466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 04/16/2015] [Indexed: 11/08/2022]
Abstract
A new 3-substituted-5-diazenylcyclopentendione named kongiidiazadione was isolated from culture filtrates of Diaporthe kongii, associated with stem cankers on sunflower in Australia. Kongiidiazadione was characterized by spectroscopic (essentially nuclear magnetic resonance [NMR] and high-resolution, electrospray ionization, mass spectrometry [HRESIMS]) methods as (-)-5-diazenyl-3-hydroxymethyl-cyclopent-3-en-1,2-dione. The stereochemistry of the diazenyl group was determined by IR spectroscopy, while the (R) absolute configuration at C(5) was assigned by computational analysis of its electronic circular dichroism (ECD) spectrum. When assayed on leaf disks of different plant species at 5 mM, the kongiidiazadione had a differential impact, causing clear necrosis, in particular to Helianthus annuus. Moreover, kongiidiazadione proved to have a weak antibacterial activity against gram-positive Bacillus amyloliquefaciens.
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Affiliation(s)
- Marco Evidente
- Università di Napoli Federico II, Dipartimento di Scienze Chimiche, Complesso Universitario Monte Sant'Angelo, Napoli, Italy
| | - Angela Boari
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, Bari, Italy
| | - Stefania Vergura
- Università della Basilicata, Dipartimento di Scienze, Potenza, Italy
| | - Alessio Cimmino
- Università di Napoli Federico II, Dipartimento di Scienze Chimiche, Complesso Universitario Monte Sant'Angelo, Napoli, Italy
| | - Maurizio Vurro
- Consiglio Nazionale delle Ricerche, Istituto di Scienze delle Produzioni Alimentari, Bari, Italy
| | - Gavin Ash
- Graham Centre for Agriculture Innovation (an Alliance between Charles Sturt University and NSW DPI), WaggaWagga, New South Wales, Australia
| | - Stefano Superchi
- Università della Basilicata, Dipartimento di Scienze, Potenza, Italy
| | - Antonio Evidente
- Università di Napoli Federico II, Dipartimento di Scienze Chimiche, Complesso Universitario Monte Sant'Angelo, Napoli, Italy
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49
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Di Meo F, Pedersen MN, Rubio-Magnieto J, Surin M, Linares M, Norman P. DNA Electronic Circular Dichroism on the Inter-Base Pair Scale: An Experimental-Theoretical Case Study of the AT Homo-Oligonucleotide. J Phys Chem Lett 2015; 6:355-359. [PMID: 26261947 DOI: 10.1021/jz502696t] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A successful elucidation of the near-ultraviolet electronic circular dichroism spectrum of a short double-stranded DNA is reported. Time-dependent density functional theory methods are shown to accurately predict spectra and assign bands on the microscopic base-pair scale, a finding that opens the field for using circular dichroism spectroscopy as a sensitive nanoscale probe of DNA to reveal its complex interactions with the environment.
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Affiliation(s)
- Florent Di Meo
- †Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183 Linköping, Sweden
| | - Morten N Pedersen
- †Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183 Linköping, Sweden
- ‡Department of Physics, Chemistry and Pharmacy, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Jenifer Rubio-Magnieto
- ||Laboratory for Chemistry of Novel Materials, Center for Innovation and Research in Materials and Polymers, University of Mons - UMONS, 20 Place du Parc, B-7000 Mons, Belgium
| | - Mathieu Surin
- ||Laboratory for Chemistry of Novel Materials, Center for Innovation and Research in Materials and Polymers, University of Mons - UMONS, 20 Place du Parc, B-7000 Mons, Belgium
| | - Mathieu Linares
- †Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183 Linköping, Sweden
- ||Laboratory for Chemistry of Novel Materials, Center for Innovation and Research in Materials and Polymers, University of Mons - UMONS, 20 Place du Parc, B-7000 Mons, Belgium
| | - Patrick Norman
- †Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183 Linköping, Sweden
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50
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Jorge FE, Jorge SS, Suave RN. Electronic circular dichroism of chiral alkenes: B3LYP and CAM-B3LYP calculations. Chirality 2014; 27:23-31. [PMID: 25283773 DOI: 10.1002/chir.22384] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Accepted: 08/02/2014] [Indexed: 11/07/2022]
Abstract
Time-dependent density functional theory (TDDFT) calculations of electronic circular dichroism (ECD) are widely used to determine absolute configurations (ACs) of chiral molecules. Two very popular DFT exchange-correlation functionals, one hybrid (B3LYP) and one long-range corrected (CAM-B3LYP), along with a hierarchical sequence of basis sets were investigated, and the ECD spectra predicted for eight alkenes and compared to gas-phase experimental spectra. Little variation in predicted ECD spectra was found with the basis set size enlargement, but the sensitivity to the functional is greater. Good agreement was obtained only with the CAM-B3LYP functional, leading to the conclusion that TDDFT calculations of ECD spectra can routinely provide reliable ACs if and only if an appropriate functional is used. For camphene, twistene, syn-(E)-bisfenchylidene, and phyllocladene, solvent effects were estimated.
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Affiliation(s)
- Francisco E Jorge
- Departamento de Física, Universidade Federal do Espírito Santo, Vitória, Brazil
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