1
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Li MZ, Chen GJ, Wang L, Liu SM, Yu JY, Wen H, Chen ZX. Novel Guanidinium-Functionalized Stigmasterol for Bile Salt Binding and Serum Cholesterol Reduction: Synthesis, Interaction Mechanisms, and In Vivo Function. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024. [PMID: 39315477 DOI: 10.1021/acs.jafc.4c06317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/25/2024]
Abstract
A novel amphiphilic guanidyl-functionalized stigmasterol hydrochloride (GFSH) was designed and synthesized as bile salt sequestrants for cholesterol reduction. GFSH exhibited a considerable in vitro capacity for bile salt binding in gastrointestinal digestion and alleviated hypercholesterolemia in vivo. GFSH spontaneously interacted with sodium cholate via synergistic electrostatic, hydrophobic, and hydrogen-bonding interactions. The effects of GFSH on serum cholesterol reduction in mice fed a high-fat-high-cholesterol diet were explored by measuring the expression of key transcription factors related to bile acid metabolism. GFSH produced a dose-dependent reduction in weight gain, hepatic fat accumulation, and fecal and blood markers. Real-time quantitative polymerase chain reaction (RT-qPCR) and western blot analyses demonstrated GFSH-induced expression of hepatic CYP7A, LXRα, and LDL-R. GFSH exerts the cholesterol-lowering activity by inducing the bile acid metabolism.
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Affiliation(s)
- Mi-Zhuan Li
- Molecular Food Science Laboratory, College of Food & Biology Engineering, Zhejiang Gongshang University, Hangzhou 310018, P. R. China
- School of Public Health, Zunyi Medical University, Zunyi 563006, P. R. China
| | - Gong-Ji Chen
- Molecular Food Science Laboratory, College of Food & Biology Engineering, Zhejiang Gongshang University, Hangzhou 310018, P. R. China
| | - Lei Wang
- Molecular Food Science Laboratory, College of Food & Biology Engineering, Zhejiang Gongshang University, Hangzhou 310018, P. R. China
| | - Shi-Mei Liu
- School of Public Health, Zunyi Medical University, Zunyi 563006, P. R. China
| | - Jia-Yin Yu
- School of Public Health, Zunyi Medical University, Zunyi 563006, P. R. China
| | - Hao Wen
- School of Public Health, Zunyi Medical University, Zunyi 563006, P. R. China
| | - Zhong-Xiu Chen
- Molecular Food Science Laboratory, College of Food & Biology Engineering, Zhejiang Gongshang University, Hangzhou 310018, P. R. China
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2
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Huang J, Wang X, Huang T, Yang Y, Tu J, Zou J, Yang H, Yang R. Application of sodium sulfobutylether-β-cyclodextrin based on encapsulation. Carbohydr Polym 2024; 333:121985. [PMID: 38494236 DOI: 10.1016/j.carbpol.2024.121985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 02/06/2024] [Accepted: 02/23/2024] [Indexed: 03/19/2024]
Abstract
Sodium Sulfobutylether-β-cyclodextrin (SBE-β-CD) is a derivative of β-cyclodextrin, characterized by its stereo structure, which closely resembles a truncated cone with a hydrophobic internal cavity. The solubility of insoluble substances within the hydrophobic cavity is significantly enhanced, reducing contact between the guest and the environment. Consequently, SBE-β-CD is frequently employed as a co-solvent and stabilizer. As the research progresses, it has been observed that the inclusion of SBE-β-CD is reversible and competitive. Besides, some inclusion complexes undergo distinct physicochemical property alterations compared to the guests. Additionally, certain guests exhibit varying inclusions with SBE-β-CD at different concentrations. These features have contributed to the expanding applications. SBE-β-CD finds widespread application in pharmaceutics as a protective agent and pKa regulator, in pharmaceutical analysis as a chiral substance separator, and in biomedical engineering for encapsulating dyes and modifying sensors. The article will elaborate in detail on the physicochemical properties of SBE-β-CD, encapsulation principles, and factors influencing the formation of inclusion complexes. Furthermore, the review focuses on the application of SBE-β-CD through encapsulation in pharmaceutics, pharmaceutical analysis, and biomedical engineering. Finally, the prospects and potential applications of SBE-β-CD are discussed.
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Affiliation(s)
- Jiaqi Huang
- Center for Research Development and Evaluation of Pharmaceutical Excipients and Generic Drugs, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China; National Institutes for Food and Drug Control, National Key Laboratory for Quality Control of Pharmaceutical Excipients, Beijing 100050, China
| | - Xiaofeng Wang
- National Institutes for Food and Drug Control, National Key Laboratory for Quality Control of Pharmaceutical Excipients, Beijing 100050, China
| | - Ting Huang
- Center for Research Development and Evaluation of Pharmaceutical Excipients and Generic Drugs, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China; National Institutes for Food and Drug Control, National Key Laboratory for Quality Control of Pharmaceutical Excipients, Beijing 100050, China
| | - Yang Yang
- Center for Research Development and Evaluation of Pharmaceutical Excipients and Generic Drugs, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China; National Institutes for Food and Drug Control, National Key Laboratory for Quality Control of Pharmaceutical Excipients, Beijing 100050, China
| | - Jiasheng Tu
- Center for Research Development and Evaluation of Pharmaceutical Excipients and Generic Drugs, Department of Pharmaceutics, School of Pharmacy, China Pharmaceutical University, Nanjing 210009, China
| | - Jian Zou
- National Institutes for Food and Drug Control, National Key Laboratory for Quality Control of Pharmaceutical Excipients, Beijing 100050, China
| | - Huiying Yang
- National Institutes for Food and Drug Control, National Key Laboratory for Quality Control of Pharmaceutical Excipients, Beijing 100050, China.
| | - Rui Yang
- National Institutes for Food and Drug Control, National Key Laboratory for Quality Control of Pharmaceutical Excipients, Beijing 100050, China.
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3
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Pandey K, Arafin S, Jones E, Du Y, Kulkarni GC, Uddin A, Woods TJ, Plunkett KN. Assembly and Disassembly of Supramolecular Hypervalent Iodine Macrocycles via Anion Coordination. J Org Chem 2024. [PMID: 38742602 DOI: 10.1021/acs.joc.3c02830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2024]
Abstract
This study explores the dynamic self-assembly and disassembly of hypervalent iodine-based macrocycles (HIMs) guided by secondary bonding interactions. The reversible disassembly and reassembly of HIMs are facilitated through anion binding via the addition of tetrabutylammonium (TBA) salts or removal of the anion by the addition of silver nitrate. The association constants for HIM monomers with TBA(Cl) and TBA(Br) are calculated and show a correlation with the strength of the iodine-anion bond. A unique tetracoordinate hypervalent iodine-based compound was identified as the disassembled monomer. Last, the study reveals the dynamic bonding nature of these macrocycles in solution, allowing for rearrangement and participation in dynamic bonding chemistry.
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Affiliation(s)
- Krishna Pandey
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
| | - Samsul Arafin
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
| | - Eli Jones
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
| | - Yachu Du
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
| | - Gajanan C Kulkarni
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
| | - Ain Uddin
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
| | - Toby J Woods
- George L. Clark X-ray Facility and 3M Materials Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kyle N Plunkett
- School of Chemical and Biomolecular Sciences, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
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4
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Zhang G, Cheng C, Li Z, Zhao D, Han C. Charge-transfer inclusion complex formation of the tropylium cation with prism[6]arenes. Org Biomol Chem 2024; 22:3611-3614. [PMID: 38630011 DOI: 10.1039/d4ob00423j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2024]
Abstract
Herein, we report that prism[6]arenes (PrS[6]R) can form charge-transfer (CT) inclusion complexes with tropylium tetrakis[3,5-bis(trifluoromethyl)-phenyl]borate (G) in chloroform solution with an obvious CT band at 560 nm. Moreover, the CT complex PrS[6]Et⊃G showed Cl-/Ag+ responsiveness which can be easily monitored by the naked eye.
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Affiliation(s)
- Guojiao Zhang
- Department of Chemistry, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
| | - Channi Cheng
- Department of Chemistry, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
| | - Zhengxiang Li
- Department of Chemistry, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
| | - Dezhi Zhao
- Department of Chemistry, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
| | - Chengyou Han
- Department of Chemistry, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.
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5
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Acosta-Calle S, Huebsch EZ, Kolmar SS, Whited MT, Chen CH, Miller AJM. Regulating Access to Active Sites via Hydrogen Bonding and Cation-Dipole Interactions: A Dual Cofactor Approach to Switchable Catalysis. J Am Chem Soc 2024. [PMID: 38598724 DOI: 10.1021/jacs.3c10877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Hydrogen bonding networks are ubiquitous in biological systems and play a key role in controlling the conformational dynamics and allosteric interactions of enzymes. Yet in small organometallic catalysts, hydrogen bonding rarely controls ligand binding to the metal center. In this work, a hydrogen bonding network within a well-defined organometallic catalyst works in concert with cation-dipole interactions to gate substrate access to the active site. An ammine ligand acts as one cofactor, templating a hydrogen bonding network within a pendent crown ether and preventing the binding of strong donor ligands, such as nitriles, to the nickel center. Sodium ions are the second cofactor, disrupting hydrogen bonding to enable switchable ligand substitution reactions. Thermodynamic analyses provide insight into the energetic requirements of the different supramolecular interactions that enable substrate gating. The dual cofactor approach enables switchable catalytic hydroamination of crotononitrile. Systematic comparisons of catalysts with varying structural features provide support for the critical role of the dual cofactors in achieving on/off catalysis with substrates containing strongly donating functional groups that might otherwise interfere with switchable catalysts.
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Affiliation(s)
- Sebastian Acosta-Calle
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Elsa Z Huebsch
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Scott S Kolmar
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Matthew T Whited
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Chun-Hsing Chen
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Alexander J M Miller
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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6
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Medina-Berríos N, Pantoja-Romero W, Lavín Flores A, Díaz Vélez S, Martínez Guadalupe AC, Torres Mulero MT, Kisslinger K, Martínez-Ferrer M, Morell G, Weiner BR. Synthesis and Characterization of Carbon-Based Quantum Dots and Doped Derivatives for Improved Andrographolide's Hydrophilicity in Drug Delivery Platforms. ACS OMEGA 2024; 9:12575-12584. [PMID: 38524434 PMCID: PMC10955586 DOI: 10.1021/acsomega.3c06252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 12/11/2023] [Accepted: 12/13/2023] [Indexed: 03/26/2024]
Abstract
Carbon-based quantum dots (CBQDs), sulfur-doped carbon-based quantum dots (S-CBQDs), and nitrogen-doped carbon-based quantum dots (N-CBQDs) have strong potential for drug delivery platforms. They were conjugated with andrographolide, a well-known hydrophobic drug, to study the concomitant changes in hydrophilicity. The interactions between these nanomaterials and the drug were studied by characterizing the optical and structural properties of the nanoparticles before and after coupling with the drug. It was found that the interaction of the drug with these nanomaterials produced noticeable changes in their optical and structural properties. Moreover, the partition coefficient for the nanocomposites was determined by NMR. The results indicate that conjugating the drug with the nanoparticles significantly enhanced its affinity for the aqueous phase, from 2.632 to 0.1117, thereby opening the possibility of using this approach for developing an effective drug delivery platform for this hydrophobic drug.
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Affiliation(s)
- Nataniel Medina-Berríos
- Department
of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
| | - Wenndy Pantoja-Romero
- Department
of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
| | - Alexis Lavín Flores
- Department
of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
| | - Sebastián
C. Díaz Vélez
- Department
of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
| | - Anna C. Martínez Guadalupe
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
- Department
of Biology, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
| | - Mariana T. Torres Mulero
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
- Department
of Biology, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
| | - Kim Kisslinger
- Brookhaven
National Lab, Upton, New York 11973, United States
| | - Magaly Martínez-Ferrer
- Division
of Cancer Biology, University of Puerto
Rico Comprehensive Cancer Center, San Juan 00936-3027, Puerto Rico
- Department
of Pharmaceutical Sciences, School of Pharmacy, University of Puerto Rico, San Juan 00925-253, Puerto Rico
| | - Gerardo Morell
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
- Department
of Physics, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
| | - Brad R. Weiner
- Department
of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan 00925-253, Puerto Rico
- Molecular
Sciences Research Center, University of
Puerto Rico, San Juan 00925-253, Puerto
Rico
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7
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Ueda T, Yamaguchi MS, Christian-Tabak L, Takai Y, Tode C. Quantifying the bitter masking effect of drug-cyclodextrin complexation: NMR-ROESY mixing time approach. Carbohydr Res 2024; 537:109067. [PMID: 38442683 DOI: 10.1016/j.carres.2024.109067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 02/15/2024] [Accepted: 02/18/2024] [Indexed: 03/07/2024]
Abstract
Taste, especially unpleasant taste, can be key for patient compliance. In the formulation development process, drug-cyclodextrin (CD) inclusion complexes are often used to improve the solubility of a drug and/or mask its bitterness. This study aimed to evaluate the bitter masking effect of CDs on different drugs using NMR-ROESY analysis, human sensory tests, and e-tongue measurements. The strength of inclusion complex formation between drugs and CDs was investigated by NMR-ROSEY, and these results were compared to human sensory test results. In the sensory test, participants identified which drug-CD inclusion complexes were not bitter. NMR-ROSEY results aligned with the sensory tests; short magnetization transfer times corresponded to masked bitterness. The electrical tongue was not able to detect the taste of any of the drug-CD inclusion complexes. Additionally, we used NMR-ROSEY to determine which drug-CD inclusion complex formed in a system with multiple drug substances present. This research offers valuable insights into the bitter masking effect of CDs on different drugs and presents a comprehensive evaluation approach using various methods. This knowledge has significant implications for the pharmaceutical industry, clinical practice, and patient care, contributing to improved patient compliance and satisfaction with bitter medications.
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Affiliation(s)
- Tomohiko Ueda
- Sumitomo Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka, 554-0022, Japan.
| | - Mei S Yamaguchi
- Sumitomo Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka, 554-0022, Japan
| | - Leela Christian-Tabak
- Sumitomo Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka, 554-0022, Japan
| | - Yoshiaki Takai
- Sumitomo Pharma Co., Ltd., 3-1-98 Kasugade-naka, Konohana-ku, Osaka, 554-0022, Japan
| | - Chisato Tode
- Kobe Pharmaceutical University, 4-19-1 Motoyama-kitamachi, Higashinada-ku, Kobe, Hyogo, 658-8558, Japan.
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8
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Lebedinskiy K, Barvík I, Tošner Z, Císařová I, Jindřich J, Hrdina R. Spatial arrangements of cyclodextrin host-guest complexes in solution studied by 13C NMR and molecular modelling. Beilstein J Org Chem 2024; 20:331-335. [PMID: 38410781 PMCID: PMC10896224 DOI: 10.3762/bjoc.20.33] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 02/09/2024] [Indexed: 02/28/2024] Open
Abstract
13C NMR spectroscopic analyses of Cs symmetric guest molecules in the cyclodextrin host cavity, combined with molecular modelling and solid-state X-ray analysis, provides a detailed description of the spatial arrangement of cyclodextrin host-guest complexes in solution. The chiral cavity of the cyclodextrin molecule creates an anisotropic environment for the guest molecule resulting in a splitting of its prochiral carbon signals in 13C NMR spectra. This signal split can be correlated to the distance of the guest atoms from the wall of the host cavity and to the spatial separation of binding sites preferred by pairs of prochiral carbon atoms. These measurements complement traditional solid-state analyses, which rely on the crystallization of host-guest complexes and their crystallographic analysis.
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Affiliation(s)
- Konstantin Lebedinskiy
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Praha, Czech Republic
| | - Ivan Barvík
- Institute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 2026/5, 121 16 Praha, Czech Republic
| | - Zdeněk Tošner
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Praha, Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Praha, Czech Republic
| | - Jindřich Jindřich
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Praha, Czech Republic
| | - Radim Hrdina
- Department of Organic Chemistry, Faculty of Science, Charles University, Hlavova 8, 128 43 Praha, Czech Republic
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9
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Marchetti L, Truzzi E, Rossi MC, Benvenuti S, Cappellozza S, Saviane A, Bogataj L, Siligardi C, Bertelli D. Alginate-Based Carriers Loaded with Mulberry ( Morus alba L.) Leaf Extract: A Promising Strategy for Prolonging 1-Deoxynojirimicyn (DNJ) Systemic Activity for the Nutraceutical Management of Hyperglycemic Conditions. Molecules 2024; 29:797. [PMID: 38398549 PMCID: PMC10892242 DOI: 10.3390/molecules29040797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 11/30/2023] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
The iminosugar 1-deoxynojirimicyn (DNJ) contained in mulberry leaves has displayed systemic beneficial effects against disorders of carbohydrate metabolism. Nevertheless, its effect is impaired by the short half-life. Alginate-based carriers were developed to encapsulate a DNJ-rich mulberry extract: Ca-alginate beads, obtained by external gelation, and spray-dried alginate microparticles (SDMs). Mean size and distribution, morphology, drug loading, encapsulation efficiency, experimental yield, and release characteristics were determined for the two formulations. Ca-alginate beads and SDMs exhibited an encapsulation efficiency of about 54% and 98%, respectively, and a DNJ loading in the range of 0.43-0.63 μg/mg. The in vitro release study demonstrated the carriers' capability in controlling the DNJ release in acid and basic conditions (<50% in 5 h), due to electrostatic interactions, which were demonstrated by 1H-NMR relaxometry studies. Thus, alginate-based particles proved to be promising strategies for producing food supplements containing mulberry leaf extracts for the management of hyperglycemic state.
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Affiliation(s)
- Lucia Marchetti
- Department of Life Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy; (L.M.); (S.B.)
| | - Eleonora Truzzi
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy
| | - Maria Cecilia Rossi
- Centro Interdipartimentale Grandi Strumenti, University of Modena and Reggio Emilia, Via G. Campi 213/A, 41125 Modena, Italy;
| | - Stefania Benvenuti
- Department of Life Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy; (L.M.); (S.B.)
| | - Silvia Cappellozza
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment (CREA-AA), Via Eulero, 6a, 35143 Padova, Italy; (S.C.); (A.S.); (L.B.)
| | - Alessio Saviane
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment (CREA-AA), Via Eulero, 6a, 35143 Padova, Italy; (S.C.); (A.S.); (L.B.)
| | - Luca Bogataj
- Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment (CREA-AA), Via Eulero, 6a, 35143 Padova, Italy; (S.C.); (A.S.); (L.B.)
| | - Cristina Siligardi
- Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, 41125 Modena, Italy;
| | - Davide Bertelli
- Department of Life Sciences, University of Modena and Reggio Emilia, Via G. Campi 103, 41125 Modena, Italy; (L.M.); (S.B.)
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10
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Glaser F, Schmitz M, Kerzig C. Coulomb interactions for mediator-enhanced sensitized triplet-triplet annihilation upconversion in solution. NANOSCALE 2023; 16:123-137. [PMID: 38054748 DOI: 10.1039/d3nr05265f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Sensitized triplet-triplet annihilation upconversion offers an attractive possibility to replace a high-energy photon by two photons with lower energy through the combination of a light-harvesting triplet sensitizer and an annihilator for the formation of a fluorescent singlet state. Typically, high annihilator concentrations are required to achieve an efficient initial energy transfer and as a direct consequence the most highly energetic emission is often not detectable due to intrinsic reabsorption by the annihilator itself. Herein, we demonstrate that the addition of a charge-adapted mediator drastically improves the energy transfer efficiency at low annihilator concentrations via an energy transfer cascade. Inspired by molecular dyads and recent developments in nanocrystal-sensitized upconversion, our system exploits a concept to minimize intrinsic filter effects, while boosting the upconversion quantum yield in solution. A sensitizer-annihilator combination consisting of a ruthenium-based complex and 9,10-diphenylanthracene (DPA) is explored as model system and a sulfonated pyrene serves as mediator. The impact of opposite charges between sensitizer and mediator - to induce coulombic attraction and subsequently result in accelerated energy transfer rate constants - is analyzed in detail by different spectroscopic methods. Ion pairing and the resulting static energy transfer in both directions is a minor process, resulting in an improved overall performance. Finally, the more intense upconverted emission in the presence of the mediator is used to drive two catalytic photoreactions in a two-chamber setup, illustrating the advantages of our approach, in particular for photoreactions requiring oxygen that would interfere with the upconversion system.
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Affiliation(s)
- Felix Glaser
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
| | - Matthias Schmitz
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
| | - Christoph Kerzig
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany.
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11
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Ge YY, Zhou XC, Zheng J, Luo J, Lai YL, Su J, Zhang HJ, Zhou XP, Li D. Self-Assembly of Two Tubular Metalloligand-Based Palladium-Organic Cages as Hosts for Polycyclic Aromatic Hydrocarbons. Inorg Chem 2023; 62:4048-4053. [PMID: 36847302 DOI: 10.1021/acs.inorgchem.2c04505] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Herein we report two tubular metal-organic cages (MOCs), synthesized by the self-assembly of bidentate metalloligands with different lengths and PdII. These two MOCs feature Pd4L8-type square tubular and Pd3L6-type triangular cage structures, respectively. Both MOCs have been fully characterized by NMR spectroscopy, mass spectrometry, and theoretical calculation. Both cages can be employed for encapsulating polycyclic aromatic hydrocarbons and show high binding affinity toward coronene.
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Affiliation(s)
- Ying-Ying Ge
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Xian-Chao Zhou
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Ji Zheng
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Jie Luo
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Ya-Liang Lai
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Juan Su
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Hao-Jie Zhang
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Xiao-Ping Zhou
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
| | - Dan Li
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, College of Chemistry and Materials Science, Jinan University, Guangzhou 510632, P. R. China
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12
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Park G, Ettles C, Charles M, Hudson RH. Nucleobase Intrinsic Quenchers: A Fluorescence Off Switch. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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13
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Li Y, Zhao H, Ren Y, Qiu M, Zhang H, Gao G, Zheng L, Stavropoulos P, Ai L. Synthesis of Enantiomers of Chiral Ester Derivatives Containing an Amide Group and Their Chiral Recognition by
1
H NMR Spectroscopy. ChemistrySelect 2023. [DOI: 10.1002/slct.202204039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Yan‐Lin Li
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Hong‐Mei Zhao
- State Key Laboratory of Information Photonics and Communications, School of Science Beijing University of Posts and Telecommunications Beijing 100876 P. R. China
| | - Yu‐Qing Ren
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Meng Qiu
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Hai‐Tong Zhang
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Guang‐Peng Gao
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Li Zheng
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
| | - Pericles Stavropoulos
- Department of Chemistry Missouri University of Science and Technology Rolla, Missouri 65409 USA
| | - Lin Ai
- College of Chemistry Beijing Normal University Beijing 100875 P. R. China
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14
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Mayer BP, Kennedy DJ, Lau EY, Valdez CA. Evaluation of polyanionic cyclodextrins as high affinity binding scaffolds for fentanyl. Sci Rep 2023; 13:2680. [PMID: 36792632 PMCID: PMC9932099 DOI: 10.1038/s41598-023-29662-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 02/08/2023] [Indexed: 02/17/2023] Open
Abstract
Cyclodextrins (CDs) have been previously shown to display modest equilibrium binding affinities (Ka ~ 100-200 M-1) for the synthetic opioid analgesic fentanyl. In this work, we describe the synthesis of new CDs possessing extended thioalkylcarboxyl or thioalkylhydroxyl moieties and assess their binding affinity towards fentanyl hydrochloride. The optimal CD studied displays a remarkable affinity for the opioid of Ka = 66,500 M-1, the largest value reported for such an inclusion complex to date. One dimensional 1H Nuclear Magnetic Resonance (NMR) as well as Rotational Frame Overhauser Spectroscopy (2D-ROESY) experiments supported by molecular dynamics (MD) simulations suggest an unexpected binding behavior, with fentanyl able to bind the CD interior in one of two distinct orientations. Binding energies derived from the MD simulations work correlate strongly with NMR-derived affinities highlighting its utility as a predictive tool for CD candidate optimization. The performance of these host molecules portends their utility as platforms for medical countermeasures for opioid exposure, as biosensors, and in other forensic science applications.
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Affiliation(s)
- Brian P. Mayer
- grid.250008.f0000 0001 2160 9702Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA ,grid.250008.f0000 0001 2160 9702Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA L-090 94550 USA ,grid.250008.f0000 0001 2160 9702Forensic Science Center, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA
| | - Daniel J. Kennedy
- grid.250008.f0000 0001 2160 9702Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA ,grid.250008.f0000 0001 2160 9702Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA L-090 94550 USA ,grid.250008.f0000 0001 2160 9702Forensic Science Center, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA
| | - Edmond Y. Lau
- grid.250008.f0000 0001 2160 9702Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA ,grid.250008.f0000 0001 2160 9702Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA L-090 94550 USA ,grid.250008.f0000 0001 2160 9702Biosciences and Biotechnology Division, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA
| | - Carlos A. Valdez
- grid.250008.f0000 0001 2160 9702Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA ,grid.250008.f0000 0001 2160 9702Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA L-090 94550 USA ,grid.250008.f0000 0001 2160 9702Forensic Science Center, Lawrence Livermore National Laboratory, Livermore, CA 94550 USA
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15
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Kutta RJ, Großkopf J, van Staalduinen N, Seitz A, Pracht P, Breitenlechner S, Bannwarth C, Nuernberger P, Bach T. Multifaceted View on the Mechanism of a Photochemical Deracemization Reaction. J Am Chem Soc 2023; 145:2354-2363. [PMID: 36660908 DOI: 10.1021/jacs.2c11265] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Upon irradiation in the presence of a chiral benzophenone catalyst (5 mol %), a racemic mixture of a given chiral imidazolidine-2,4-dione (hydantoin) can be converted almost quantitatively into the same compound with high enantiomeric excess (80-99% ee). The mechanism of this photochemical deracemization reaction was elucidated by a suite of mechanistic experiments. It was corroborated by nuclear magnetic resonance titration that the catalyst binds the two enantiomers by two-point hydrogen bonding. In one of the diastereomeric complexes, the hydrogen atom at the stereogenic carbon atom is ideally positioned for hydrogen atom transfer (HAT) to the photoexcited benzophenone. Detection of the protonated ketyl radical by transient absorption revealed hydrogen abstraction to occur from only one but not from the other hydantoin enantiomer. Quantum chemical calculations allowed us to visualize the HAT within this complex and, more importantly, showed that the back HAT does not occur to the carbon atom of the hydantoin radical but to its oxygen atom. The achiral enol formed in this process could be directly monitored by its characteristic transient absorption signal at λ ≅ 330 nm. Subsequent tautomerization leads to both hydantoin enantiomers, but only one of them returns to the catalytic cycle, thus leading to an enrichment of the other enantiomer. The data are fully consistent with deuterium labeling experiments and deliver a detailed picture of a synthetically useful photochemical deracemization reaction.
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Affiliation(s)
- Roger Jan Kutta
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, RegensburgD-93053, Germany
| | - Johannes Großkopf
- Department Chemie and Catalysis Research Center (CRC), School of Natural Sciences, Technische Universität München, D-85747Garching, Germany
| | - Nils van Staalduinen
- Institut für Physikalische Chemie, RWTH Aachen University, D-52074Aachen, Germany
| | - Antonia Seitz
- Department Chemie and Catalysis Research Center (CRC), School of Natural Sciences, Technische Universität München, D-85747Garching, Germany
| | - Philipp Pracht
- Institut für Physikalische Chemie, RWTH Aachen University, D-52074Aachen, Germany.,Yusuf Hamied Department of Chemistry, University of Cambridge, CambridgeCB2 1EW, United Kingdom
| | - Stefan Breitenlechner
- Department Chemie and Catalysis Research Center (CRC), School of Natural Sciences, Technische Universität München, D-85747Garching, Germany
| | - Christoph Bannwarth
- Institut für Physikalische Chemie, RWTH Aachen University, D-52074Aachen, Germany
| | - Patrick Nuernberger
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, RegensburgD-93053, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), School of Natural Sciences, Technische Universität München, D-85747Garching, Germany
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16
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Xu EY, Werth J, Roos CB, Bendelsmith AJ, Sigman MS, Knowles RR. Noncovalent Stabilization of Radical Intermediates in the Enantioselective Hydroamination of Alkenes with Sulfonamides. J Am Chem Soc 2022; 144:18948-18958. [PMID: 36197450 PMCID: PMC9668373 DOI: 10.1021/jacs.2c07099] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Noncovalent interactions (NCIs) are critical elements of molecular recognition in a wide variety of chemical contexts. While NCIs have been studied extensively for closed-shell molecules and ions, very little is understood about the structures and properties of NCIs involving free radical intermediates. In this report, we describe a detailed mechanistic study of the enantioselective radical hydroamination of alkenes with sulfonamides and present evidence suggesting that the basis for asymmetric induction in this process arises from attractive NCIs between a neutral sulfonamidyl radical intermediate and a chiral phosphoric acid (CPA). We describe experimental, computational, and data science-based evidence that identifies the specific radical NCIs that form the basis for the enantioselectivity. Kinetic studies support that C-N bond formation determines the enantioselectivity. Density functional theory investigations revealed the importance of both strong H-bonding between the CPA and the N-centered radical and a network of aryl-based NCIs that serve to stabilize the favored diastereomeric transition state. The contributions of these specific aryl-based NCIs to the selectivity were further confirmed through multivariate linear regression analysis by comparing the measured enantioselectivity to computed descriptors. These results highlight the power of NCIs to enable high levels of enantioselectivity in reactions involving uncharged open-shell intermediates and expand our understanding of radical-molecule interactions.
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Affiliation(s)
- Eve Y. Xu
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, United States
| | - Jacob Werth
- Department of Chemistry, University of Utah, Salt Lake City, Utah, 84112, United States
| | - Casey B. Roos
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, United States
| | - Andrew J. Bendelsmith
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, United States
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, Salt Lake City, Utah, 84112, United States
| | - Robert R. Knowles
- Department of Chemistry, Princeton University, Princeton, New Jersey, 08544, United States
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17
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Electronic Tuning of Host-Guest Interactions within the Cavities of Fluorophore-Appended Calix[4]arenes. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27175689. [PMID: 36080456 PMCID: PMC9457996 DOI: 10.3390/molecules27175689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 08/29/2022] [Accepted: 09/02/2022] [Indexed: 11/26/2022]
Abstract
A series of fluorescent calix[4]arene scaffolds bearing electron-rich carbazole moiety conjugated at the lower rim have been prepared. Studies of the fluorescence quenching in the presence of the N-methyl pyridinium guest revealed that the electronic properties of the distal phenolic ring play a major role in the host–guest complexation. In particular, placing an electron-donating piperidine fragment at that ring significantly increased the host–guest interactions, while introducing the same fragment into the proximal phenolic ring weakened the fluorescence response. These results suggest that the dominant interactions between the guest and calixarene cavity involve the oxygen-depleted fluorophore-bearing aromatic ring and not the more electron-rich unsubstituted phenolic fragments.
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18
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Sarraute S, Biesse-Martin AS, Devemy J, Dequidt A, Bonal C, Malfreyt P. Investigation of the Complexation between 4-Aminoazobenzene and Cucurbit[7]uril through a Combined Spectroscopic, Nuclear Magnetic Resonance, and Molecular Simulation Studies. ACS OMEGA 2022; 7:25013-25021. [PMID: 35910107 PMCID: PMC9330255 DOI: 10.1021/acsomega.2c00499] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 06/30/2022] [Indexed: 06/02/2023]
Abstract
Cucurbiturils are well known for their ability to form supramolecular systems with ultrahigh affinities binding. Inclusion complex between 4-aminoazobenzene and cucurbit[7]uril has been investigated in aqueous solution by ultraviolet (UV)-spectroscopy, 1H NMR, and molecular simulations. 4-aminoazobenzene shows high affinity in acidic solutions while no association was detected in neutral solutions. The thermodynamic properties of complex formation are investigated using both UV spectroscopy and nuclear magnetic resonance (NMR) measurements. Our results highlight that the high binding constant between CB7 and 4AA (log K = 4.9) is the result of a large negative change in Δr H° (-19 kJ/mol) and a small positive change in TΔr S° (9 kJ/mol). The analysis of the experimental data lead to hypothesis on the structure of the complex. We have used molecular dynamics simulation to interpret experiments. Interestingly, the cis-trans isomerization of aminoazobenzene is considered. All the results are discussed and compared with those previously obtained with other host molecules.
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19
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Jopa S, Wójcik J, Ejchart A, Nowakowski M. NMR studies of inclusion complexes: naphthalene and natural cyclodextrins. Phys Chem Chem Phys 2022; 24:13690-13697. [PMID: 35611965 DOI: 10.1039/d2cp01152b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Inclusion complexes of naphthalene (NP) with cyclodextrins (CD) have been investigated so far using non-NMR techniques resulting in inconsistent data. Here, the first application of high-field NMR spectroscopy in combination with a precise analysis of the results has allowed us to determine accurately the stoichiometry of complexes and their association constants. Titration measurements have been performed by 1H NMR spectroscopy in D2O at a magnetic field B0 of 18.8 T. NP and αCD form a 1 : 2 complex in which a single NP molecule is closed in a capsule made up of two αCD macrocycles. NP and βCD build coexisting 2 : 1 and 2 : 2 complexes with large binding constants. Larger γCD host molecules form essentially similar complexes with NP as the βCD but corresponding binding constants are smaller.
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Affiliation(s)
- Sylwia Jopa
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland.
| | - Jacek Wójcik
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warszawa, Poland
| | - Andrzej Ejchart
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5A, 02-106 Warszawa, Poland
| | - Michał Nowakowski
- Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland.
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20
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Reek JNH, de Bruin B, Pullen S, Mooibroek TJ, Kluwer AM, Caumes X. Transition Metal Catalysis Controlled by Hydrogen Bonding in the Second Coordination Sphere. Chem Rev 2022; 122:12308-12369. [PMID: 35593647 PMCID: PMC9335700 DOI: 10.1021/acs.chemrev.1c00862] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Transition metal catalysis is of utmost importance for the development of sustainable processes in academia and industry. The activity and selectivity of metal complexes are typically the result of the interplay between ligand and metal properties. As the ligand can be chemically altered, a large research focus has been on ligand development. More recently, it has been recognized that further control over activity and selectivity can be achieved by using the "second coordination sphere", which can be seen as the region beyond the direct coordination sphere of the metal center. Hydrogen bonds appear to be very useful interactions in this context as they typically have sufficient strength and directionality to exert control of the second coordination sphere, yet hydrogen bonds are typically very dynamic, allowing fast turnover. In this review we have highlighted several key features of hydrogen bonding interactions and have summarized the use of hydrogen bonding to program the second coordination sphere. Such control can be achieved by bridging two ligands that are coordinated to a metal center to effectively lead to supramolecular bidentate ligands. In addition, hydrogen bonding can be used to preorganize a substrate that is coordinated to the metal center. Both strategies lead to catalysts with superior properties in a variety of metal catalyzed transformations, including (asymmetric) hydrogenation, hydroformylation, C-H activation, oxidation, radical-type transformations, and photochemical reactions.
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Affiliation(s)
- Joost N H Reek
- Homogeneous and Supramolecular Catalysis, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.,InCatT B.V., Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Bas de Bruin
- Homogeneous and Supramolecular Catalysis, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Sonja Pullen
- Homogeneous and Supramolecular Catalysis, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Tiddo J Mooibroek
- Homogeneous and Supramolecular Catalysis, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | | | - Xavier Caumes
- InCatT B.V., Science Park 904, 1098 XH Amsterdam, The Netherlands
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21
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Hydrogen Bonds in Precursor Solution: The Origin of the Anomalous J–V Curves in Perovskite Solar Cells. CRYSTALS 2022. [DOI: 10.3390/cryst12050610] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Perovskite Solar Cells are a promising solar energy harvesting technology due to their low cost and high-power conversion efficiency. A high-quality perovskite layer is fundamental for a highly efficient perovskite Solar Cell. Utilizing a gas quenching process (GQP) can eliminate the need for toxic, flammable, and expensive anti-solvents in the preparation of perovskite layers. It is a promising candidate technology for large scale preparation of perovskite layers, as it can be easily integrated in a production line by coupling up-scalable techniques. The GQP removes the need for polar solvents in the precursor solution layer by using nitrogen flow, rather than extracting them with non-polar solvents. The crystallization dynamics in this process can be significantly different. In this study, we found that the quality of perovskite crystal from GQP is much more sensitive to Lewis base molecules (LBMs) in the precursor solution than it is in anti-solvents technology. Thus, the processing parameters of the LBMs in anti-solvents technology cannot be directly transferred to the GQP. An XRD and 1H NMR study explains the origin of the S-shaped J–V curves and how these LBMs hinder the reaction between PbI2 and monovelent cations.
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22
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Doan AT, Doan VTH, Katsuki J, Fujii S, Kono H, Sakurai K. Dramatically Increased Binding Constant of Water-Soluble Cyclodextrin Hyperbranched Polymers: Explored with Diffusion Ordered NMR Spectroscopy (DOSY). ACS OMEGA 2022; 7:10890-10900. [PMID: 35415377 PMCID: PMC8991930 DOI: 10.1021/acsomega.1c06194] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 03/08/2022] [Indexed: 05/13/2023]
Abstract
We report that the polymerization of cyclodextrin (CD) with epichlorohydrin (ECH) dramatically increases the binding constant of CD to vanillin, from 55 to 8.4 × 103 M-1, by approximately 100 times, as determined by diffusion ordered spectroscopy (DOSY)-1H NMR. The binding constant increased with an increase of the ECH content of the polymer, although ECH polymers without CDs showed no affinity at all, suggesting that the hydrophobicity of the ECH network outside of CDs helps to enhance the binding. This increased binding constant allows CD-ECH polymers to increase the drug loading ratio, which may be one of the most critical issues for drug delivery systems.
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Affiliation(s)
- Anh Thi
Ngoc Doan
- Department
of Chemistry and Biochemistry, University
of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
| | - Van Thi Hong Doan
- Department
of Chemistry and Biochemistry, University
of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
| | - Jun Katsuki
- Department
of Chemistry and Biochemistry, University
of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
| | - Shota Fujii
- Department
of Chemistry and Biochemistry, University
of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
| | - Hiroyuki Kono
- Division
of Applied Chemistry and Biochemistry, National
Institute of Technology Tomakomai College, 443 Nishikioka, Tomakomai, Hokkaido 059-1275, Japan
| | - Kazuo Sakurai
- Department
of Chemistry and Biochemistry, University
of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
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23
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Sheng Q, Wang L, Zhang L, Wang X, Qian S, Lan M, Qing G, Liang X. High-efficiency Two-dimensional Separation of Natural Products Based on β-Cyclodextrin Stationary Phase Working in Both Hydrophilic and Reversed Hydrophobic Modes. J Chromatogr A 2022; 1673:463069. [DOI: 10.1016/j.chroma.2022.463069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 03/09/2022] [Accepted: 04/14/2022] [Indexed: 10/18/2022]
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24
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Sulfobutylation of Beta-Cyclodextrin Enhances the Complex Formation with Mitragynine: An NMR and Chiroptical Study. Int J Mol Sci 2022; 23:ijms23073844. [PMID: 35409208 PMCID: PMC8998676 DOI: 10.3390/ijms23073844] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 03/25/2022] [Accepted: 03/29/2022] [Indexed: 02/05/2023] Open
Abstract
Mitragynine (MTR), the main indole alkaloid of the well-known plant kratom (Mitragyna speciosa), is one of the most studied natural products nowadays, due to its remarkable biological effects. It is a partial agonist on the opioid receptors, and as such relieves pain without the well-known side-effects of the opioids applied in the clinical practice. MTR and its derivatives therefore became novel candidates for drug development. The poor aqueous solubility and low bioavailability of drugs are often improved by cyclodextrins (CyDs) as excipients through host-guest type complex formation. Among the wide variety of CyDs, sulfobutylether-beta-cyclodextrin (SBEβCyD) is frequently used and official in the European and U.S. Pharmacopoeia. Herein, the host-guest complexation of MTR with βCyD and SBEβCyD was studied using chiroptical and NMR spectroscopy. It was found by NMR measurements that MTR forms a rather weak (logβ11 = 0.8) 1:1 host-guest complex with βCyD, while the co-existence of the 2MTR∙SBEβCyD and MTR∙SBEβCyD species was deducted from 1H NMR titrations in the millimolar MTR concentration range. Sulfobutylation of βCyD significantly enhanced the affinity towards MTR. The structure of the formed inclusion complex was extensively studied by circular dichroism spectroscopy and 2D ROESY NMR. The insertion of the indole moiety was confirmed by both techniques.
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25
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Tűz B, Noszál B, Hosztafi S, Mazák K. β-cyclodextrin complex formation and protonation equilibria of morphine and other opioid compounds of therapeutic interest. Eur J Pharm Sci 2022; 171:106120. [PMID: 34999212 DOI: 10.1016/j.ejps.2022.106120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/02/2021] [Accepted: 01/05/2022] [Indexed: 11/24/2022]
Abstract
The inclusion complex formation of morphine and its 18 opioid derivatives with β-cyclodextrin has been studied using nuclear magnetic resonance spectroscopy. Initially, the protonation equilibria and the acid-base properties of dibasic opioid compounds have been fully characterized. Apparent protonation constants and the relative concentration of the microspecies in cyclodextrin excess were also determined. The 1:1 complex stoichiometry was confirmed by the continuous variation method of Job using UV-VIS spectroscopy. The stability constants of the different protonation forms were determined by 1H NMR titrations. The highest stability was observed in highly alkaline solutions where the amino group is in its unprotonated, neutral state. The structures of the complexes were investigated by two-dimensional ROESY experiments. Based on the stability constants and ROESY experiments, morphine derivatives with longer side chain on the nitrogen atom such as nalbuphine and naltrexone show stronger complexation. The protonation state of the phenolate group, positioned outside the CD cavity, has only a slight influence on the complex stability.
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Affiliation(s)
- Boglárka Tűz
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes Endre u. 9., Budapest H-1092, Hungary
| | - Béla Noszál
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes Endre u. 9., Budapest H-1092, Hungary
| | - Sándor Hosztafi
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes Endre u. 9., Budapest H-1092, Hungary
| | - Károly Mazák
- Department of Pharmaceutical Chemistry, Semmelweis University, Hőgyes Endre u. 9., Budapest H-1092, Hungary.
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26
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Zheng X, Tang T, Li L, Xu LW, Huang S, Zhao Y. Application of aromatic amide-derived atropisomers as chiral solvating agents for discrimination of optically active mandelic acid derivatives in 1 H nuclear magnetic resonance spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2022; 60:86-92. [PMID: 34106483 DOI: 10.1002/mrc.5185] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 06/03/2021] [Accepted: 06/04/2021] [Indexed: 06/12/2023]
Abstract
Non-biaryl atropisomers and their stereochemistry have attracted much attentions in the past years. However, application of the non-biaryl atropisomers as chiral solvating agents is yet to be explored. In this work, four aromatic amide-derived atropisomeric phosphine ligands (hosts) were used as chiral solvating agents to recognize various mandelic acid derivatives (guests) in 1 H nuclear magnetic resonance (NMR) spectroscopy. It is found that chiral center configurations of the four hosts have different effects on the enantiorecognition to the used guests. In addition, the host and guest interaction was further investigated by determination of the host-guest complex stoichiometry using the Job's method and density functional theory calculation, respectively. Moreover, chiral analysis accuracy of these hosts was evaluated through relationship between enantiomeric excess values of 4-chloromandelic acid provided by NMR and gravimetry, respectively.
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Affiliation(s)
- Xiaojing Zheng
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, China
| | - Tingfeng Tang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, China
| | - Li Li
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou, China
| | - Shaohua Huang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo, China
| | - Yufen Zhao
- Institute of Drug Discovery Technology, Ningbo University, Ningbo, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo, China
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27
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Floare CG, Bogdan M, Tomoaia-Cotişel M, Mocanu A. 1H NMR spectroscopic characterization of inclusion complex of desferrioxamine B chelator and β-cyclodextrin. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131477] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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28
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Molecular interactions in remdesivir-cyclodextrin systems. J Pharm Biomed Anal 2021; 209:114482. [PMID: 34856493 PMCID: PMC8609759 DOI: 10.1016/j.jpba.2021.114482] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 11/05/2021] [Accepted: 11/14/2021] [Indexed: 02/01/2023]
Abstract
Remdesivir (REM) is the first antiviral drug (Veklury™) approved by the Food and Drug Administration for the therapy of COVID-19. Due to its poor water solubility, the preparation of Veklury™ requires a suitable solubilizing excipient at pH 2 conditions. For this purpose, the final formulation contains the randomly substituted sulfobutylether-β-cyclodextrin (SBEβCD) as a complexing agent. Herein, extensive NMR spectroscopic study with various cyclodextrin (CD) derivatives were conducted to understand the interactions in SBEβCD - REM systems at the molecular level. The pKa value of REM has been determined experimentally for the first time, as the protonation state of the aminopyrrolo-triazine moiety can play a key role in CD-REM inclusion complex formation as SBEβCD has permanent negative charges. The UV-pH titration experiments yielded a pKa of 3.56, thus the majority of REM bears a positive charge at pH 2.0. NMR experiments were performed on β- and γCD derivatives to determine complex stabilities, stoichiometries and structures. The stability constants were determined by nonlinear curve fitting based on 1H NMR titrations at pH 2.0, while Job's method was used to determine the stoichiometries. βCD complexes were one order of magnitude more stable than their γCD counterparts. Sulfobutylation resulted in a significant increase in stability and the single isomer derivatives showed unexpectedly high stability values (logK = 4.35 for REM - per-6-SBEβCD). In the case of βCDs, the ethylbutyl-moiety plays a key role in complexation immersing into the βCD cavity, while the phenoxy-moiety overtakes and drives the inclusion of REM in the case of γCDs. This is the first comprehensive study of REM-CD complexation, allowing the design of new CD derivatives with tailored stabilities, thereby aiding the formulation or production and even the analytical characterization of REM.
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29
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Luo S, Qiu F, Shi H, Yu W. Design, Characterizations and Host‐Guest Properties of a New Metal‐Organic Cage Based on Half‐Sandwich Rhodium Moieties. ChemistrySelect 2021. [DOI: 10.1002/slct.202103116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shi‐Ting Luo
- Analysis and Testing Central Facility Institutes of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan 243002 P. R. China
| | - Feng‐Yi Qiu
- Analysis and Testing Central Facility Institutes of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan 243002 P. R. China
| | - Hua‐Tian Shi
- Analysis and Testing Central Facility Institutes of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan 243002 P. R. China
| | - Weibin Yu
- Analysis and Testing Central Facility Institutes of Molecular Engineering and Applied Chemistry Anhui University of Technology Ma'anshan 243002 P. R. China
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30
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Bouattour Y, Neflot-Bissuel F, Traïkia M, Biesse-Martin AS, Frederic R, Yessaad M, Jouannet M, Wasiak M, Chennell P, Sautou V. Cyclodextrins Allow the Combination of Incompatible Vancomycin and Ceftazidime into an Ophthalmic Formulation for the Treatment of Bacterial Keratitis. Int J Mol Sci 2021; 22:ijms221910538. [PMID: 34638878 PMCID: PMC8508691 DOI: 10.3390/ijms221910538] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 09/24/2021] [Accepted: 09/27/2021] [Indexed: 01/31/2023] Open
Abstract
Ceftazidime (CZ) and vancomycin (VA) are two antibiotics used to treat bacterial keratitis. Due to their physical incompatibility (formation of a precipitate), it is not currently possible to associate both molecules in a single container for ophthalmic administration. We firstly characterized the incompatibility then investigated if 2-hydroxypropyl-beta (HPβCD) and 2-hydroxypropyl-gamma cyclodextrins (HPγCD) could prevent this incompatibility. The impact of pH on the precipitation phenomena was investigated by analysing the supernatant solution of the mixture using high performance liquid chromatography. A characterization of the inclusion of CZ with HPγCD using 1H nuclear magnetic resonance (NMR), and VA with HPβCD using 1H-NMR and a solubility diagram was performed. A design of experiment was built to determine the optimal conditions to obtain a formulation that had the lowest turbidity and particle count. Our results showed that VA and CZ form an equimolar precipitate below pH 7.3. The best formulation obtained underwent an in-vitro evaluation of its antibacterial activity. The impact of HPCDs on incompatibility has been demonstrated through the inclusion of antibiotics and especially VA. The formulation has been shown to be able to inhibit the incompatibility for pH higher than 7.3 and to possess unaltered antibacterial activity.
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Affiliation(s)
- Yassine Bouattour
- Université Clermont Auvergne, CHU Clermont Ferrand, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France; (Y.B.); (V.S.)
| | - Florent Neflot-Bissuel
- CHU Clermont-Ferrand, Pôle Pharmacie, F-63000 Clermont-Ferrand, France; (F.N.-B.); (M.Y.); (M.J.); (M.W.)
| | - Mounir Traïkia
- Université Clermont Auvergne, CNRS, SIGMA-Clermont, ICCF, F-63000 Clermont-Ferrand, France; (M.T.); (A.-S.B.-M.)
| | - Anne-Sophie Biesse-Martin
- Université Clermont Auvergne, CNRS, SIGMA-Clermont, ICCF, F-63000 Clermont-Ferrand, France; (M.T.); (A.-S.B.-M.)
| | - Robin Frederic
- Université Clermont Auvergne, Inserm U1071, INRA USC2018, F-63000 Clermont-Ferrand, France;
| | - Mouloud Yessaad
- CHU Clermont-Ferrand, Pôle Pharmacie, F-63000 Clermont-Ferrand, France; (F.N.-B.); (M.Y.); (M.J.); (M.W.)
| | - Mireille Jouannet
- CHU Clermont-Ferrand, Pôle Pharmacie, F-63000 Clermont-Ferrand, France; (F.N.-B.); (M.Y.); (M.J.); (M.W.)
| | - Mathieu Wasiak
- CHU Clermont-Ferrand, Pôle Pharmacie, F-63000 Clermont-Ferrand, France; (F.N.-B.); (M.Y.); (M.J.); (M.W.)
| | - Philip Chennell
- Université Clermont Auvergne, CHU Clermont Ferrand, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France; (Y.B.); (V.S.)
- Correspondence:
| | - Valerie Sautou
- Université Clermont Auvergne, CHU Clermont Ferrand, Clermont Auvergne INP, CNRS, ICCF, F-63000 Clermont-Ferrand, France; (Y.B.); (V.S.)
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31
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Zhang H, Zhao H, Wen J, Zhang Z, Stavropoulos P, Li Y, Ai L, Zhang J. Discrimination of enantiomers of amides with two stereogenic centers enabled by chiral bisthiourea derivatives using 1H NMR spectroscopy. Org Biomol Chem 2021; 19:6697-6706. [PMID: 34296731 PMCID: PMC9420356 DOI: 10.1039/d1ob00742d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Enantiomers of a few new amides containing two stereogenic centers have been derived from d- and l-α-amino acids as guests for chiral recognition by 1H NMR spectroscopy. A variety of chiral amides with two or more stereogenic centers often exist in the products of catalytic asymmetric synthesis, natural products or their total synthetic products, and chiral drugs. It would be a challenging and meaningful work to explore their chiral recognition. For this purpose, a class of novel chiral bisthiourea derivatives 1-9 has been synthesized from (1S,2S)-(+)-1,2-diaminocyclohexane, d-α-amino acids, and isothiocyanates as chiral solvating agents (CSAs). CSAs 1-9 proved to afford better chiral discriminating results towards most amides with two stereogenic centers, which have been rarely studied as chiral substrates by 1H NMR spectroscopy. In particular, CSAs 7, 8 and 9, featuring 3,5-bis(trifluoromethyl)benzene residues, exhibit outstanding chiral discriminating capabilities towards all amides, providing well-separated 1H NMR signals and sufficiently large nonequivalent chemical shifts. To test their practical application in the determination of enantiomeric excess, 1H NMR spectra of chiral amides (G16) with different optical purities were measured in the presence of CSAs 7 and 8, respectively. Their ee values (up to 90%) were accurately calculated by the integration of the NH proton of the CONHPh group of G16. To better understand the chiral discriminating behavior, Job plots of (±)-G16 with CSA 7 and (±)-G17 with CSA 8 and the association constants (Ka) of (S,R)-G16 and (R,S)-G16 with CSA 7 were evaluated, respectively. In order to further reveal any underlying intermolecular hydrogen bonding interactions, theoretical calculations of the enantiomers of (S,R)-G16 and (R,S)-G16 with CSA 7 were performed by means of the hybrid density functional theory (B3LYP) with the standard basis sets of 3-21G of the Gaussian 03 program, respectively.
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Affiliation(s)
- Hanchang Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Hongmei Zhao
- State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China
| | - Jie Wen
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Zhanbin Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Pericles Stavropoulos
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
| | - Yanlin Li
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Lin Ai
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Jiaxin Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
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32
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Lidskog A, Dawaigher S, Solano Arribas C, Ryberg A, Jensen J, Bergquist KE, Sundin A, Norrby PO, Wärnmark K. Experimental and Computational Models for Side Chain Discrimination in Peptide-Protein Interactions. Chemistry 2021; 27:10883-10897. [PMID: 33908678 PMCID: PMC8362025 DOI: 10.1002/chem.202100890] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Indexed: 12/02/2022]
Abstract
A bis(18‐crown‐6) Tröger's base receptor and 4‐substituted hepta‐1,7‐diyl bisammonium salt ligands have been used as a model system to study the interactions between non‐polar side chains of peptides and an aromatic cavity of a protein. NMR titrations and NOESY/ROESY NMR spectroscopy were used to analyze the discrimination of the ligands by the receptor based on the substituent of the ligand, both quantitatively (free binding energies) and qualitatively (conformations). The analysis showed that an all‐anti conformation of the heptane chain was preferred for most of the ligands, both free and when bound to the receptor, and that for all of the receptor‐ligand complexes, the substituent was located inside or partly inside of the aromatic cavity of the receptor. We estimated the free binding energy of a methyl‐ and a phenyl group to an aromatic cavity, via CH‐π, and combined aromatic CH‐π and π‐π interactions to be −1.7 and −3.3 kJ mol−1, respectively. The experimental results were used to assess the accuracy of different computational methods, including molecular mechanics (MM) and density functional theory (DFT) methods, showing that MM was superior.
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Affiliation(s)
- Anna Lidskog
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Sami Dawaigher
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Carlos Solano Arribas
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Anna Ryberg
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Jacob Jensen
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Karl Erik Bergquist
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Anders Sundin
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
| | - Per-Ola Norrby
- Data Science & Modelling, Pharmaceutical Sciences, R&D, AstraZeneca Gothenburg, Gothenburg, Sweden
| | - Kenneth Wärnmark
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, P. O Box 124, S-221 00, Lund, Sweden
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33
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Plaza M, Großkopf J, Breitenlechner S, Bannwarth C, Bach T. Photochemical Deracemization of Primary Allene Amides by Triplet Energy Transfer: A Combined Synthetic and Theoretical Study. J Am Chem Soc 2021; 143:11209-11217. [PMID: 34279085 DOI: 10.1021/jacs.1c05286] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The photochemical deracemization of 2,4-disubstituted 2,3-butadienamides (allene amides) was investigated both experimentally and theoretically. The reaction was catalyzed by a thioxanthone which is covalently linked to a chiral 1,5,7-trimethyl-3-azabicyclo[3.3.1]nonan-2-one skeleton providing a U-shaped arrangement of the sensitizing unit relative to a potential hydrogen-bonding site. Upon irradiation at λ = 420 nm in the presence of the sensitizer (2.5 mol %), the amides reached at -10 °C a photostationary state in which one enantiomer prevailed. The enantioenriched allene amides (70-93% ee) were isolated in 74% to quantitative yield (19 examples). Based on luminescence data and DFT calculations, energy transfer from the thioxanthone to the allene amides is thermodynamically feasible, and the achiral triplet allene intermediate was structurally characterized. Hydrogen bonding of the amide enantiomers to the sensitizer was monitored by NMR titration. The experimental association constants (Ka) were similar (59.8 vs 25.7 L·mol-1). DFT calculations, however, revealed a significant difference in the binding properties of the two enantiomers. The major product enantiomer exhibits a noncovalent dispersion interaction of its arylmethyl group to the external benzene ring of the thioxanthone, thus moving away the allene from the carbonyl chromophore. The minor enantiomer displays a CH-π interaction of the hydrogen atom at the terminal allene carbon atom to the same benzene ring, thus forcing the allene into close proximity to the chromophore. The binding behavior explains the observed enantioselectivity which, as corroborated by additional calculations, is due to a rapid triplet energy transfer within the substrate-catalyst complex of the minor enantiomer.
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Affiliation(s)
- Manuel Plaza
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, D-85747 Garching, Germany
| | - Johannes Großkopf
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, D-85747 Garching, Germany
| | - Stefan Breitenlechner
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, D-85747 Garching, Germany
| | - Christoph Bannwarth
- Institute of Physical Chemistry, RWTH Aachen University, D-52056 Aachen, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, D-85747 Garching, Germany
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34
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Szente L, Puskás I, Sohajda T, Varga E, Vass P, Nagy ZK, Farkas A, Várnai B, Béni S, Hazai E. Sulfobutylether-beta-cyclodextrin-enabled antiviral remdesivir: Characterization of electrospun- and lyophilized formulations. Carbohydr Polym 2021; 264:118011. [PMID: 33910715 PMCID: PMC8025548 DOI: 10.1016/j.carbpol.2021.118011] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 03/22/2021] [Accepted: 03/28/2021] [Indexed: 10/30/2022]
Abstract
Veklury™ by Gilead Sciences, Inc., containing antiviral drug, remdesivir (REM) has received emergency authorization in the USA and in Europe for COVID-19 therapy. Here, for the first time, we describe details of the non-covalent, host-guest type interaction between REM and the solubilizing excipient, sulfobutylether-beta-cyclodextrin (SBECD) that results in significant solubility enhancement. Complete amorphousness of the cyclodextrin-enabled REM formulation was demonstrated by X-ray diffraction, thermal analysis, Raman chemical mapping and electron microscopy/energy dispersive spectroscopy. The use of solubilizing carbohydrate resulted in a 300-fold improvement of the aqueous solubility of REM, and enhanced dissolution rate of the drug enabling the preparation of stable infusion solutions for therapy. 2D ROESY NMR spectroscopy provided information on the nature of REM-excipient interaction and indicated the presence of inclusion phenomenon and the electrostatic attraction between anionic SBECD and nitrogen-containing REM in aqueous solution.
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Affiliation(s)
- Lajos Szente
- CycloLab Cyclodextrin R&D Laboratory Ltd., H-1097, Budapest, Illatos út 7., Hungary.
| | - István Puskás
- CycloLab Cyclodextrin R&D Laboratory Ltd., H-1097, Budapest, Illatos út 7., Hungary
| | - Tamás Sohajda
- CycloLab Cyclodextrin R&D Laboratory Ltd., H-1097, Budapest, Illatos út 7., Hungary
| | - Erzsébet Varga
- CycloLab Cyclodextrin R&D Laboratory Ltd., H-1097, Budapest, Illatos út 7., Hungary
| | - Panna Vass
- Budapest University of Technology and Economics, H-1111, Budapest, Műegyetem rkp. 3, Hungary
| | - Zsombor Kristóf Nagy
- Budapest University of Technology and Economics, H-1111, Budapest, Műegyetem rkp. 3, Hungary
| | - Attila Farkas
- Budapest University of Technology and Economics, H-1111, Budapest, Műegyetem rkp. 3, Hungary
| | - Bianka Várnai
- Semmelweis University, Department of Pharmacognosy, Budapest, Üllői út 26, Hungary
| | - Szabolcs Béni
- Semmelweis University, Department of Pharmacognosy, Budapest, Üllői út 26, Hungary
| | - Eszter Hazai
- Virtua Drug, Ltd., H-1015, Budapest, Csalogány utca 4C, Hungary
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35
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Tahir MN, Cao Y, Azzouz A, Roy R. Host-guest chemistry of the sulfasalazine-β-cyclodextrin inclusion complex. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Várnai B, Grabarics M, Szakács Z, Pagel K, Malanga M, Sohajda T, Béni S. Structural characterization of fondaparinux interaction with per-6-amino-beta-cyclodextrin: An NMR and MS study. J Pharm Biomed Anal 2021; 197:113947. [PMID: 33601159 DOI: 10.1016/j.jpba.2021.113947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 01/28/2021] [Accepted: 01/30/2021] [Indexed: 11/18/2022]
Abstract
The highly anionic synthetic pentasaccharide fondaparinux (FDPX) - representing the antithrombin binding sequence of heparin - is in clinical use as a potent anticoagulant. Contrary to the unfractionated heparin, FDPX lacks potent antidote completely reversing its anticoagulant activity, therefore it is of great importance to identify new structures exhibiting strong intermolecular interactions towards FDPX. The polycationic heptakis(6-amino-6-deoxy)-beta-cyclodextrin (NH2-β-CD) can serve as an excellent model compound to mimic these interactions between the oppositely charged oligosaccharides. Herein, extensive NMR spectroscopic and nano-electrospray ionization mass spectrometric (nESI-MS) studies were conducted to understand the molecular-level interactions in the FDPX - NH2-β-CD systems. NMR experiments were performed at pD 7.4 and 2.0. Job's method of continuous variation and 1H NMR titration experiments suggested the formation of FDPX∙NH2-β-CD complex at pD 7.4, while the presence of multiple complexes was assumed at pD 2.0. Stability constants were determined by separate 1H NMR titrations, yielding log β11=3.65 ± 0.02 at pD 7.4, while log β11 ≥ 4.9 value suggested a high-affinity system at pD 2.0. 2D NOESY NMR studies indicated spatial proximities between the anomeric resonance α-l-iduronic acid residue and the cyclodextrin's methylene unit in the proximity of the cationic amino function. Acidic degradation of FDPX was investigated by NMR and MS for the first time in detail confirming that desulfation occurs involving one to two sulfate moieties. The desulfation of FDPX was inhibited by the cationic cyclodextrin in the case of equimolar ratio at pD 2.0. This is the first report on the stabilizing effect of cyclodextrin complexation on heparin degradation.
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Affiliation(s)
- Bianka Várnai
- Semmelweis University, Department of Pharmacognosy, Üllői út. 26, H-1085, Budapest, Hungary
| | - Márkó Grabarics
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Arnimallee 22, 14195, Berlin, Germany; Fritz Haber Institute of the Max Planck Society, Department of Molecular Physics, Faradayweg 4-6, 14195, Berlin, Germany
| | - Zoltán Szakács
- Gedeon Richter Plc., Spectroscopic Research Department, H-1475, Budapest, P.O.B. 27, Hungary
| | - Kevin Pagel
- Freie Universität Berlin, Institute of Chemistry and Biochemistry, Arnimallee 22, 14195, Berlin, Germany; Fritz Haber Institute of the Max Planck Society, Department of Molecular Physics, Faradayweg 4-6, 14195, Berlin, Germany
| | - Milo Malanga
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097, Illatos út 7, Hungary
| | - Tamás Sohajda
- CycloLab, Cyclodextrin R&D Ltd, Budapest, H-1097, Illatos út 7, Hungary
| | - Szabolcs Béni
- Semmelweis University, Department of Pharmacognosy, Üllői út. 26, H-1085, Budapest, Hungary.
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37
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Yesypenko OA, Osipova AO, Tribrat OO, Kravchenko SO, Usachov OM, Dyakonenko VV, Ryabitskii AB, Pirozhenko VV, Shishkina SV, Rozhenko AB, Kalchenko VI. Synthesis and enantiorecognition properties of stereoisomeres of inherently chiral propyloxy-octyloxy-calix[4]arene acetic acids. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131894] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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Yu W, Qiu FY, Luo ST, Shi HT, Yuan G, Wei X. Coordination assembly and host–guest chemistry of a triply interlocked [2]catenane. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00174d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Triply catenated systems composed of two or more discrete coordination-metal cages through mechanical bonds exhibit excellent host–guest behaviors, which can be potentially applied in drug delivery systems.
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Affiliation(s)
- Weibin Yu
- Analysis and Testing Central Facility
- Institutes of Molecular Engineering and Applied Chemistry
- Anhui University of Technology
- Ma'anshan 243002
- P. R. China
| | - Feng-Yi Qiu
- Analysis and Testing Central Facility
- Institutes of Molecular Engineering and Applied Chemistry
- Anhui University of Technology
- Ma'anshan 243002
- P. R. China
| | - Shi-Ting Luo
- Analysis and Testing Central Facility
- Institutes of Molecular Engineering and Applied Chemistry
- Anhui University of Technology
- Ma'anshan 243002
- P. R. China
| | - Hua-Tian Shi
- Analysis and Testing Central Facility
- Institutes of Molecular Engineering and Applied Chemistry
- Anhui University of Technology
- Ma'anshan 243002
- P. R. China
| | - Guozan Yuan
- Analysis and Testing Central Facility
- Institutes of Molecular Engineering and Applied Chemistry
- Anhui University of Technology
- Ma'anshan 243002
- P. R. China
| | - Xianwen Wei
- Analysis and Testing Central Facility
- Institutes of Molecular Engineering and Applied Chemistry
- Anhui University of Technology
- Ma'anshan 243002
- P. R. China
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39
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Synthesis, silver (I) extraction and silver (I) binding studies of novel N1,N3-bis(2-(benzylthio)ethyl)propanediamide derivatives. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-020-01307-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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40
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Amponsah-Efah KK, Mistry P, Eisenhart R, Suryanarayanan R. The Influence of the Strength of Drug-Polymer Interactions on the Dissolution of Amorphous Solid Dispersions. Mol Pharm 2020; 18:174-186. [PMID: 33332132 DOI: 10.1021/acs.molpharmaceut.0c00790] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In an earlier report, ionic interactions between ketoconazole (KTZ), a weakly basic drug, and poly(acrylic acid) (PAA), an anionic polymer, resulted in a dramatic decrease in molecular mobility as well as reduced crystallization propensity of amorphous solid dispersion (ASD) in the solid state. On the other hand, weaker dipole-dipole interactions between KTZ and polyvinylpyrrolidone (PVP) resulted in ASDs with higher crystallization propensity (Mistry Mol Pharm., 2015, 12 (9), 3339-3350). In this work, we investigated the behavior of the ketoconazole (KTZ) solid dispersions in aqueous media. In vitro dissolution tests showed that the PAA ASD maintained the level of supersaturation for a longer duration than the PVP ASD at low polymer contents (4-20% w/w polymer). Additionally, the PAA ASDs were more resistant to drug crystallization in aqueous medium when measured with synchrotron X-ray diffractometry. Two-dimensional 1H nuclear Overhauser effect spectroscopy (NOESY) NMR cross peaks between ketoconazole and PAA confirmed the existence of drug-polymer interactions in D2O. The interaction was accompanied by a reduced drug diffusivity as monitored by 2D diffusion ordered spectroscopy (DOSY) NMR and enthalpy-driven when characterized by isothermal titration calorimetry (ITC). On the other hand, drug-polymer interactions were not detected between ketoconazole and PVP in aqueous solution, with NOESY, DOSY, or ITC. The results suggest that interactions that stabilize ASDs in the solid state can also be relevant and important in sustaining supersaturation in solution.
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Affiliation(s)
- Kweku K Amponsah-Efah
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 308 Harvard Street SE, Minneapolis, Minnesota 55455, United States
| | - Pinal Mistry
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 308 Harvard Street SE, Minneapolis, Minnesota 55455, United States
| | - Reed Eisenhart
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Raj Suryanarayanan
- Department of Pharmaceutics, College of Pharmacy, University of Minnesota, 308 Harvard Street SE, Minneapolis, Minnesota 55455, United States
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Amponsah-Efah KK, Demeler B, Suryanarayanan R. Characterizing Drug-Polymer Interactions in Aqueous Solution with Analytical Ultracentrifugation. Mol Pharm 2020; 18:246-256. [PMID: 33264020 DOI: 10.1021/acs.molpharmaceut.0c00849] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We present a new approach for characterizing drug-polymer interactions in aqueous media, using sedimentation velocity analytical ultracentrifugation (AUC). We investigated the potential interaction of ketoconazole (KTZ), a poorly water-soluble drug, with polyacrylic acid (PAA) and a polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymer (Soluplus) in aqueous buffers. The effect of the polymer on the sedimentation coefficient of the drug was the observable metric. The drug alone, when subjected to AUC, exhibited a very narrow sedimentation peak at 0.2 Svedberg (S), in agreement with the expectation for a monomeric drug with a molar mass < 1000 Dalton. Conversely, the neat polymers showed broad profiles with higher sedimentation coefficients, reflecting their larger more heterogeneous size distributions. The sedimentation profiles of the drug-polymer mixtures were expectedly different from the profile of the neat drug. With KTZ-Soluplus, a complete shift to faster sedimentation times (indicative of an interaction) was observed, while with KTZ-PAA, a split peak indicated the existence of the drug in both free and interacting states. The sedimentation profile of carbamazepine, a second model drug, in the presence of hydroxypropyl methyl cellulose acetate succinate (HPMCAS, another polymer) revealed multiple "populations" of drug-polymer species, very similar to the sedimentation profile of neat HPMCAS. The interactions probed by AUC were compared with the results from isothermal titration calorimetry. In vitro dissolution tests performed on amorphous solid dispersions prepared with the same drug-polymer pairs suggested that the interactions may play a role in prolonging drug supersaturation. The results show the possibility of characterizing drug-polymer interactions in aqueous solution with high hydrodynamic resolution, addressing a major challenge frequently encountered in the mechanistic investigations of the dissolution behavior of amorphous solid dispersions.
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Affiliation(s)
- Kweku K Amponsah-Efah
- Department of Pharmaceutics, University of Minnesota, 308 Harvard St SE, Minneapolis, Minnesota 55455, United States
| | - Borries Demeler
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive, Lethbridge, Alberta T1K 3M4, Canada
| | - Raj Suryanarayanan
- Department of Pharmaceutics, University of Minnesota, 308 Harvard St SE, Minneapolis, Minnesota 55455, United States
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Li X, Kutta RJ, Jandl C, Bauer A, Nuernberger P, Bach T. Photochemically Induced Ring Opening of Spirocyclopropyl Oxindoles: Evidence for a Triplet 1,3‐Diradical Intermediate and Deracemization by a Chiral Sensitizer. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008384] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Xinyao Li
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Roger J. Kutta
- Institut für Physikalische und Theoretische Chemie Universität Regensburg Universitätsstr. 31 93053 Regensburg Germany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Andreas Bauer
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Patrick Nuernberger
- Institut für Physikalische und Theoretische Chemie Universität Regensburg Universitätsstr. 31 93053 Regensburg Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
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Bussandri S, Buljubasich L, Acosta RH. Diffusion measurements with continuous hydrogenation in PHIP. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 320:106833. [PMID: 33032245 DOI: 10.1016/j.jmr.2020.106833] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 09/19/2020] [Accepted: 09/20/2020] [Indexed: 06/11/2023]
Abstract
DOSY is a powerful spectroscopic NMR technique that resolves components in mixtures through the evaluation of different diffusion coefficients. The application of DOSY to dilute mixtures is hampered by the low signal to noise ratios (SNR), leading to long acquisition times. The use of PHIP may resolve this issue as long as reproducible signals are obtained in order to perform 2D experiments. Here we show that the use of hollow membranes and adequate gas flow produce constant polarization for a time-span that enables the acquisition of 2D experiments. A pressure gradient is evidenced by the presence of convection, which is accounted for by using a DPGSE sequence. The influence of J-coupling evolution during the sequence is studied both numerically and experimentally, to determine the optimum echo-time. The applicability of the method for samples with poor SNR is explored by setting the reaction rate to achieve a low intensity of polarized signals.
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Affiliation(s)
- S Bussandri
- Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, Córdoba, Argentina; CONICET, Instituto de Física Enrique Gaviola (IFEG), Córdoba, Argentina
| | - L Buljubasich
- Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, Córdoba, Argentina; CONICET, Instituto de Física Enrique Gaviola (IFEG), Córdoba, Argentina.
| | - R H Acosta
- Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, Córdoba, Argentina; CONICET, Instituto de Física Enrique Gaviola (IFEG), Córdoba, Argentina
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Lin C, Skufca J, Partch RE. New insights into prediction of weak π-π complex association through proton-nuclear magnetic resonance analysis. BMC Chem 2020; 14:66. [PMID: 33292404 PMCID: PMC7602360 DOI: 10.1186/s13065-020-00718-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 07/21/2020] [Indexed: 11/16/2022] Open
Abstract
For analysis of weak π–π complexes proton-nuclear magnetic resonance (proton-NMR) simultaneously provides information of stacking configurations and association constants \documentclass[12pt]{minimal}
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\begin{document}$$\left( K \right)$$\end{document}K However, an apparent issue for this approach is inconsistent/impossible constant estimation which often leads to unreasonable interpretation for π–π complexation. Whether or not this proton-dependent constant variation could be attributed to simple experimental uncertainties or to more sophisticated additional unspecific shielding effects (AUS effects) was addressed by means of hypothesis tests using a robust bootstrap technique in this report. Our analysis shows the significance of AUS effects on such variation in constant estimation. A following study using numeric simulation further reveals the variation patterns induced by AUS effects and concludes that the largest \documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document}K among the obtained \documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document}K estimates of a complex is considered as the best estimate of \documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document}K due to minimum deviation from the true value of K and the multiple \documentclass[12pt]{minimal}
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\begin{document}$$K$$\end{document}K estimates of a π–π complex could provide preferable inferences for complex geometries.
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Affiliation(s)
- Chenyu Lin
- Chemistry & Biomolecular Department, Clarkson University, Potsdam, NY, 13699, USA.
| | - Joseph Skufca
- Mathematics Department, Clarkson University, 8 Clarkson Ave., Potsdam, NY, 13699, USA
| | - Richard E Partch
- Chemistry & Biomolecular Department, Clarkson University, Potsdam, NY, 13699, USA
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Applications of NMR in Drug:Cyclodextrin Complexes. Methods Mol Biol 2020. [PMID: 33113144 DOI: 10.1007/978-1-0716-0920-0_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
NMR spectroscopy is an effective technique, applicable for studying bioactive materials or drug delivery systems in order to obtain comprehensive details related to structural and dynamic characteristics at atomic resolution. The applications of NMR spectroscopy have been increased considerably as a result of the combination of advancement in technological NMR instrumentation and scientific knowledge. This chapter is dedicated to highlight the applications of NMR spectroscopy in drug:cyclodextrin complexes using both liquid- and solid-state NMR spectroscopy.
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Aderibigbe AD, Clark AJ. N,S-donor acetamide ligand: silver (I) binding and test silver (I) extraction studies. TRANSIT METAL CHEM 2020. [DOI: 10.1007/s11243-020-00428-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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47
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Li X, Kutta RJ, Jandl C, Bauer A, Nuernberger P, Bach T. Photochemically Induced Ring Opening of Spirocyclopropyl Oxindoles: Evidence for a Triplet 1,3-Diradical Intermediate and Deracemization by a Chiral Sensitizer. Angew Chem Int Ed Engl 2020; 59:21640-21647. [PMID: 32757341 PMCID: PMC7756555 DOI: 10.1002/anie.202008384] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 07/23/2020] [Indexed: 12/17/2022]
Abstract
The photochemical deracemization of spiro[cyclopropane‐1,3′‐indolin]‐2′‐ones (spirocyclopropyl oxindoles) was studied. The corresponding 2,2‐dichloro compound is configurationally labile upon direct irradiation at λ=350 nm and upon irradiation at λ=405 nm in the presence of achiral thioxanthen‐9‐one as the sensitizer. The triplet 1,3‐diradical intermediate generated in the latter reaction was detected by transient absorption spectroscopy and its lifetime determined (τ=22 μs). Using a chiral thioxanthone or xanthone, with a lactam hydrogen bonding site as a photosensitizer, allowed the deracemization of differently substituted chiral spirocyclopropyl oxindoles with yields of 65–98 % and in 50–85 % ee (17 examples). Three mechanistic contributions were identified to co‐act favorably for high enantioselectivity: the difference in binding constants to the chiral thioxanthone, the smaller molecular distance in the complex of the minor enantiomer, and the lifetime of the intermediate 1,3‐diradical.
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Affiliation(s)
- Xinyao Li
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany
| | - Roger J Kutta
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany
| | - Andreas Bauer
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany
| | - Patrick Nuernberger
- Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Universitätsstr. 31, 93053, Regensburg, Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC), Technische Universität München, Lichtenbergstraße 4, 85747, Garching, Germany
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48
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Singh A, Maikhuri VK, Verma V, Chhatwal RJ, Sharma D, Prasad AK. Synthesis and carboxylate anion binding studies on cyclic sugar-amino acid hybrids. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1785502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Ankita Singh
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, India
| | - Vipin K. Maikhuri
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, India
| | - Vineet Verma
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, India
| | | | - Deepti Sharma
- Sri Venkateswara College, University of Delhi, Delhi, India
| | - Ashok K. Prasad
- Bioorganic Laboratory, Department of Chemistry, University of Delhi, Delhi, India
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Ruengsuk A, Khamphaijun K, Pananusorn P, Docker A, Tantirungrotechai J, Sukwattanasinitt M, Harding DJ, Bunchuay T. Pertosylated pillar[5]arene: self-template assisted synthesis and supramolecular polymer formation. Chem Commun (Camb) 2020; 56:8739-8742. [PMID: 32633280 DOI: 10.1039/d0cc04005c] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile synthesis of decatosylate pillar[5]arene 1 is reported in excellent yield (>70%). The high yield is attributed to a self-template effect of the pendant tosylate arms. The X-ray crystal structure shows the formation of a linear supramolecular polymer, stabilised by intermolecular pillar[5]arene-tosylate inclusion complexes. These polymeric arrays persist in solution and form rod-like microfibril nanostructures evidenced by SEM.
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Affiliation(s)
- Araya Ruengsuk
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand.
| | - Korawit Khamphaijun
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand.
| | - Puttipong Pananusorn
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand.
| | - Andrew Docker
- Department of Chemistry, University of Oxford Chemistry Research Laboratory Mansfield Road, Oxford, OX1 3TA, USA
| | - Jonggol Tantirungrotechai
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand.
| | | | - David J Harding
- Functional Materials and Nanotechnology Center of Excellence, Walailak University, Thasala, Nakhon Si Thammarat 80160, Thailand
| | - Thanthapatra Bunchuay
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC), Faculty of Science, Mahidol University, Bangkok, 10400, Thailand.
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50
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Yang Z, Stein RA, Ngendahimana T, Pink M, Rajca S, Jeschke G, Eaton SS, Eaton GR, Mchaourab HS, Rajca A. Supramolecular Approach to Electron Paramagnetic Resonance Distance Measurement of Spin-Labeled Proteins. J Phys Chem B 2020; 124:3291-3299. [PMID: 32227839 DOI: 10.1021/acs.jpcb.0c00743] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We demonstrate a host-guest molecular recognition approach to advance double electron-electron resonance (DEER) distance measurements of spin-labeled proteins. We synthesized an iodoacetamide derivative of 2,6-diazaadamantane nitroxide (DZD) spin label that could be doubly incorporated into T4 Lysozyme (T4L) by site-directed spin labeling with efficiency up to 50% per cysteine. The rigidity of the fused ring structure and absence of mobile methyl groups increase the spin echo dephasing time (Tm) at temperatures above 80 K. This enables DEER measurements of distances >4 nm in DZD-labeled T4L in glycerol/water at temperatures up to 150 K with increased sensitivity compared to that of a common spin label such as MTSL. Addition of β-cyclodextrin reduces the rotational correlation time of the label, slightly increases Tm, and most importantly, narrows (and slightly lengthens) the interspin distance distributions. The distance distributions are in good agreement with simulated distance distributions obtained by rotamer libraries. These results provide a foundation for developing supramolecular recognition to facilitate long-distance DEER measurements at near physiological temperatures.
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Affiliation(s)
- Zhimin Yang
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, United States
| | - Richard A Stein
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee 37232, United States
| | - Thacien Ngendahimana
- Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208, United States
| | - Maren Pink
- IUMSC, Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
| | - Suchada Rajca
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, United States
| | - Gunnar Jeschke
- Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 2, CH-8093 Zürich, Switzerland
| | - Sandra S Eaton
- Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208, United States
| | - Gareth R Eaton
- Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208, United States
| | - Hassane S Mchaourab
- Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, Tennessee 37232, United States
| | - Andrzej Rajca
- Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, United States
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