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Maity S, Khatri J, Kumar V, Dhar BB. Keto-enol tautomerism of β-diketo molecules in the presence of graphitic materials through π-π stacking. Phys Chem Chem Phys 2024; 26:6118-6126. [PMID: 38299585 DOI: 10.1039/d3cp05822k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
The pseudo aromatic structures of the enol forms of β-diketo molecules are stabilized on the surface of graphitic materials through π-π interaction. This phenomenon has been studied through a relative binding energy calculation using density functional theory. The intermolecular interaction as well as the relative stability of the keto or enol tautomer is also influenced by the functional groups attached to the graphitic materials. The theoretical results are supported by spectroscopic evidence. Our study with three different graphitic materials, with a comparable extent of π-electrons and acid functionalities, reveals that π-π interaction is the main governing factor for the stability of the enol forms. Then comes the role of intermolecular H-bonding between the adsorbate and adsorbent. This can stabilize both the keto and enol tautomers, according to the arrangements of the functional groups and the geometry of the β-diketo molecules. Acid groups on the adsorbent can enhance enolization through H-bonding, but an excess of functional groups may decrease the possibility of π-π interaction by disrupting the π-clouds of the graphitic surface and pushing the adsorbate and adsorbent away from each other beyond a π-π stacking distance. In that situation, H-bonding becomes crucial for determining the relative stability. Our results indicate that graphitic materials with acid functionalities across their edges, and ample π-cloud, are the most suitable catalysts for enolization.
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Affiliation(s)
- Sayantan Maity
- Department of Chemistry, School of Natural Sciences, Shiv Nadar Institution of Eminence Deemed to be University, Delhi NCR, Gautam Buddha Nagar, Dadri, UP-201314, India.
| | - Jaipriya Khatri
- Department of Chemistry, School of Natural Sciences, Shiv Nadar Institution of Eminence Deemed to be University, Delhi NCR, Gautam Buddha Nagar, Dadri, UP-201314, India.
| | - Vijay Kumar
- Center for Informatics, School of Natural Sciences, Shiv Nadar Institution of Eminence Deemed to be University, Delhi NCR, Gautam Buddha Nagar, Dadri, UP-201314, India.
- Dr. Vijay Kumar Foundation, 1969 Sector 4, Gurgaon, Haryana 122001, India
| | - Basab Bijayi Dhar
- Department of Chemistry, School of Natural Sciences, Shiv Nadar Institution of Eminence Deemed to be University, Delhi NCR, Gautam Buddha Nagar, Dadri, UP-201314, India.
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2
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Tighadouini S, Roby O, Mortada S, Lakbaibi Z, Radi S, Al-Ali A, Faouzi MEA, Ferbinteanu M, Garcia Y, Al-Zaqri N, Zarrouk A, Warad I. Crystal structure, physicochemical, DFT, optical, keto-enol tautomerization, docking, and anti-diabetic studies of (Z)-pyrazol β-keto-enol derivative. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131308] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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3
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Othman AK, El Kurdi R, Patra D. Outstanding Enhancement of Curcumin Fluorescence in PDDA and Silica Nanoparticles Coated DMPC Liposomes Based Nanocapsules: Application for Selective Estimation of ATP**. ChemistrySelect 2021. [DOI: 10.1002/slct.202101386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Alaa K. Othman
- Department of Chemistry American University of Beirut Beirut 1107-2020 Lebanon
| | - Riham El Kurdi
- Department of Chemistry American University of Beirut Beirut 1107-2020 Lebanon
| | - Digambara Patra
- Department of Chemistry American University of Beirut Beirut 1107-2020 Lebanon
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4
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Kumar MD, Jaccob M. The keto-enol tautomerization of ethyl acetoacetate in choline ionic liquids: the role of cation and anion in switching the tautomeric equilibrium. Phys Chem Chem Phys 2021; 23:7386-7397. [PMID: 33876098 DOI: 10.1039/d0cp05090c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In this work, density functional theory (DFT) calculations were carried out to study the role of the explicit treatment of four different choline-based ionic liquids (CS, CP, NS, and NP) by utilizing two different cations and anions in the tautomeric equilibrium of ethyl acetoacetate (EAA). The involvement of the acidic N-H proton from the cationic part of NS and NP ionic liquid offers the possibility to have two more additional transition states for the tautomeric equilibrium of EAA. The computed results demonstrated that a high activation free energy barrier (ΔG = 49.4 kcal mol-1) is associated with the direct enol to keto (E → K) interconversion via a 4-membered ring transition state. Upon explicit involvement of the cationic part of ionic liquids in the tautomeric equilibrium via a 6-membered ring transition state (CAT), ΔG is substantially reduced to 21.88 kcal mol-1. Further, ΔG is drastically reduced to 10.57 kcal mol-1 upon the involvement of the anionic part of the ionic liquid explicitly via an 8-membered ring transition state (AAT). The W-shaped TS in the CAT pathway causes steric hindrance and increases the energy penalty, while the sickle-shaped TS in AAT facilitates easy proton transfer without the influence of the steric factor. In addition, the RDG scatter graphs predict large negative values of ρ*, which indicate that the hydrogen bonding network in AAT is stronger, enhancing the delocalization of the electron density. The QTAIM analysis substantiated the role of intermolecular hydrogen bonding interactions between the ionic liquid and EAA and within the anion-cation pair in stabilizing the keto group of EAA. Besides, the involvement of the acidic N-H proton in the transition state is the key factor in influencing the energetics of the keto-enol tautomerization reaction. The present study illustrates molecular-level insights into the role of individual ions of ionic liquids and also provides adequate ideas for designing novel ionic liquid-based catalysts for industrially relevant chemical reactions.
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Affiliation(s)
- Madhu Deepan Kumar
- Department of Chemistry & Computational Chemistry Laboratory, Loyola Institute of Frontier Energy (LIFE), Loyola College, University of Madras, Chennai 600 034, Tamil Nadu, India.
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Jiménez GL, Rosales-Hoz MJ, Leyva MA, Reyes-Rodríguez J, Galindo-García U, Falcony C. Structural analysis of an Europium-Sodium complex containing 2-thenoyltrifluoroacetone and succinimide as ligands, a highly photoluminescent material. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129778] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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6
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Maity S, Ram F, Dhar BB. Phosphorous-Doped Graphitic Material as a Solid Acid Catalyst for Microwave-Assisted Synthesis of β-Ketoenamines and Baeyer-Villiger Oxidation. ACS OMEGA 2020; 5:15962-15972. [PMID: 32656417 PMCID: PMC7345427 DOI: 10.1021/acsomega.0c01231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Accepted: 06/08/2020] [Indexed: 06/11/2023]
Abstract
Synthesis of phosphorous-doped graphitic materials (P-Gc) using phytic acid as a precursor was done in a microwave oven in a cost- and time-effective green way. The material was used as a solid acid catalyst for microwave (MW)-assisted synthesis of β-ketoenamines and Baeyer-Villiger (BV) oxidation. In the case of BV oxidation, hydrogen peroxide (H2O2) was used as a green oxidant. For β-ketoenamines, in most cases, 100% conversion with an ∼95% yield was achieved in ethyl acetate medium. In solvent-free conditions, the yield of β-ketoenamines was ∼75%. A kinetic study suggested that the resonance stabilization of the positive reaction center happens in the transition state for β-ketoenamine synthesis. In BV oxidation, cyclic ketones were converted to their corresponding cyclic esters in good to high yields (∼80% yield) in a shorter reaction time (6-20 min). As per our knowledge, this is the first report of BV oxidation catalyzed by a heteroatom-doped graphitic material. For BV oxidation, the phosphoric acid functional groups present in P-Gc might increase the electrophilicity of the carbonyl group of the ketones to compensate for the weakness of H2O2 as a nucleophile and a spiro-bisperoxide intermediate has been identified in high-resolution mass spectrometry.
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Affiliation(s)
- Sayantan Maity
- Department
of Chemistry, Shiv Nadar University, Gautam Buddha Nagar, Dadri UP-201314, India
| | - Farsa Ram
- Polymer
Science and Engineering Division, CSIR-National
Chemical Laboratory, Dr. Homi Bhabha Road, Pune, Maharashtra 411008, India
| | - Basab Bijayi Dhar
- Department
of Chemistry, Shiv Nadar University, Gautam Buddha Nagar, Dadri UP-201314, India
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7
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Yang Y, Li D, Li C, Liu Y, Jiang K. Asymmetric substitution changes the UV-induced nonradiative decay pathway and the spectra behaviors of β-diketones. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 207:209-215. [PMID: 30240982 DOI: 10.1016/j.saa.2018.09.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 09/13/2018] [Accepted: 09/14/2018] [Indexed: 06/08/2023]
Abstract
Asymmetric substitution has not been termed as an essential factor in studying photo-induced ultrafast dynamics of molecular system. Asymmetric 4-hydroxybut-3-en-2-one (HEO), together with symmetric malonaldehyde (MA) and acetylacetone (AA), have been provided as target sample to study the nonradiative decay (ND) processes of β-diketones. An effective ND pathway of the three molecules is presented that their excited second (S2) states transfer to first (S1) state by nonadiabatic surface hopping, and then transfer to triplet (T1) state by crossing minimum energy crossing point (MECP), after which decay to ground (S0) state through MECP. More importantly, the asymmetric substitution of HEO induces the proton transfer in the S1 state and generates a proton-transferred conformer with lowest energy, which does not occur for MA and AA. This change exploits a new ND pathway that the S1 state decays to the proton transferred T1 state and then undergoes reverse proton transfer to S0 state through the MECPs between the three states. The two pathways of HEO give detailed energy and geometric information on surface hopping of S2/S1 and MECPs of S1/T1/S0, and interpret the reason of the ND pathway while not spectra emission. This result is significantly different from the previous reported ND pathway of photoisomerization or conical intersection between different states. This work shows that asymmetric substitution changes the molecular structure and then changes their spectra behaviors.
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Affiliation(s)
- Yonggang Yang
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Donglin Li
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Chaozheng Li
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Yufang Liu
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China.
| | - Kai Jiang
- School of Environment, Henan Normal University, Xinxiang 453007, China
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Meinke JL, Mehaffey MR, Wagner DT, Sun N, Zhang Z, Brodbelt JS, Keatinge-Clay AT. Structural and Functional Studies of a gem-Dimethylating Methyltransferase from a trans-Acyltransferase Assembly Line. ACS Chem Biol 2018; 13:3306-3314. [PMID: 30371052 DOI: 10.1021/acschembio.8b00733] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The methyl substituents in products of trans-acyltransferase assembly lines are usually incorporated by S-adenosyl-methionine (SAM)-dependent methyltransferase (MT) domains. The gem-dimethyl moieties within the polyketide disorazol are installed through the iterative action of an MT in the third module of its assembly line. The 1.75-Å-resolution crystal structure of this MT helps elucidate how it catalyzes the addition of two methyl groups. Activity assays of point mutants on β-ketoacyl chains linked to an acyl carrier protein and N-acetylcysteamine provide additional insights into the roles of active site residues. The replacement of an alanine with a phenylalanine at an apparent gatekeeping position resulted in more monomethylation than dimethylation. MTs may form an interface with ketoreductases (KRs) and even mediate the docking of trans-acyltransferase assembly line polypeptides through this association.
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Affiliation(s)
- Jessica L. Meinke
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - M. Rachel Mehaffey
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Drew T. Wagner
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Ningze Sun
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Zhicheng Zhang
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Jennifer S. Brodbelt
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Adrian T. Keatinge-Clay
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas 78712, United States
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9
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Durlak P, Latajka Z. Investigations of the hydrogen bond in the crystals of tropolone and thiotropolone via car‐parrinello and path integral molecular dynamics. J Comput Chem 2018; 40:671-687. [DOI: 10.1002/jcc.25753] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 10/21/2018] [Accepted: 10/22/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Piotr Durlak
- Faculty of ChemistryUniversity of Wrocław Wrocław 50‐383 Poland
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Durlak P, Latajka Z. Car–Parrinello and Path Integral Molecular Dynamics Study of the Proton Transfer in the Intramolecular Hydrogen Bonds in the Ketohydrazone–Azoenol System. J Phys Chem B 2018; 122:7862-7873. [DOI: 10.1021/acs.jpcb.8b04883] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Piotr Durlak
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie Street, 50-383 Wrocław, Poland
| | - Zdzisław Latajka
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie Street, 50-383 Wrocław, Poland
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11
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Pareras G, Palusiak M, Duran M, Solà M, Simon S. Tuning the Strength of the Resonance-Assisted Hydrogen Bond in o-Hydroxybenzaldehyde by Substitution in the Aromatic Ring 1. J Phys Chem A 2018; 122:2279-2287. [PMID: 29378123 DOI: 10.1021/acs.jpca.7b12066] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Intramolecular resonance-assisted hydrogen bonds (RAHBs) are stronger than conventional hydrogen bonds (HBs) thanks to the extra stabilization connected with the partial delocalization of the π-electrons within the HB motif containing conjugated formally single and double bonds. When these conjugated bonds are part of an aromatic ring, there is an interplay between resonance-assisted hydrogen bonding and the aromaticity of the ring. The main aim of the present work is to analyze the changes in RAHB strength by substitution in the aromatic ring. For this purpose, we use density functional theory methods to study all possible mono- and disubstitutions in the four free positions of the aromatic ring of o-hydroxybenzaldehyde. As substituents, we consider three π-electron donating groups (EDG: NH2, OH, and F) and three π-electron withdrawing groups (EWG: NO2, NO, and CN). We show that it is possible to tune the HB bond distance in the RAHB by locating different substituents in given positions of the aromatic ring. Indeed, certain combinations of EDG and EWD result in a reduction or increase of the HB distance by up to 0.05 Å. Results found can be explained by considering the existence of a resonance effect of the π-electrons within the HB motif.
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Affiliation(s)
- Gerard Pareras
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona , C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia Spain
| | - Marcin Palusiak
- Department of Theoretical and Structural Chemistry, Faculty of Chemistry, University of Łódź , Pomorska 163/165, 90-236 Łódź, Poland
| | - Miquel Duran
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona , C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia Spain
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona , C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia Spain
| | - Sílvia Simon
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona , C/ Maria Aurèlia Capmany 69, 17003 Girona, Catalonia Spain
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12
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John J, Rugmini SD, Nair BS. Kinetics and Mechanism of the Thermal and Hydrolytic Decomposition Reaction of Rosocyanin. INT J CHEM KINET 2018. [DOI: 10.1002/kin.21148] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Jeena John
- Department of Chemistry; Mahatma Gandhi College; University of Kerala; Thiruvananthapuram India
| | - Sudha Devi Rugmini
- Department of Chemistry; Mahatma Gandhi College; University of Kerala; Thiruvananthapuram India
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13
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Ajavakom V, Yutthaseri T, Chantanatrakul R, Suksamrarn A, Ajavakom A. Curcuminoids in Multi-Component Synthesis. J Heterocycl Chem 2017. [DOI: 10.1002/jhet.3005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Vachiraporn Ajavakom
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science; Ramkhamhaeng University; Bangkok 10240 Thailand
| | - Thatsawan Yutthaseri
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science; Ramkhamhaeng University; Bangkok 10240 Thailand
| | - Rachata Chantanatrakul
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science; Ramkhamhaeng University; Bangkok 10240 Thailand
| | - Apichart Suksamrarn
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science; Ramkhamhaeng University; Bangkok 10240 Thailand
| | - Anawat Ajavakom
- Nanotec-CU Center of Excellence on Food and Agriculture, Department of Chemistry, Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
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14
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Podyachev SN, Sudakova SN, Gimazetdinova GS, Shamsutdinova NA, Syakaev VV, Barsukova TA, Iki N, Lapaev DV, Mustafina AR. Synthesis, metal binding and spectral properties of novel bis-1,3-diketone calix[4]arenes. NEW J CHEM 2017. [DOI: 10.1039/c6nj03381d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Novel bis-1,3-diketone calix[4]arenes provide good antenna effects on Tb3+- and Yb3+-centered luminescence.
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Affiliation(s)
- Sergey N. Podyachev
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Svetlana N. Sudakova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | | | - Nataliya A. Shamsutdinova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Victor V. Syakaev
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Tatjiana A. Barsukova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
| | - Nobuhiko Iki
- Graduate School of Environmental Studies
- Tohoku University
- Sendai 980-8579
- Japan
| | - Dmitry V. Lapaev
- Zavoisky Physical-Technical Institute of Kazan Scientific Center of Russian Academy of Sciences
- 420029 Kazan
- Russia
| | - Asiya R. Mustafina
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan
- Russia
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Mahmudov KT, Pombeiro AJL. Resonance-Assisted Hydrogen Bonding as a Driving Force in Synthesis and a Synthon in the Design of Materials. Chemistry 2016; 22:16356-16398. [PMID: 27492126 DOI: 10.1002/chem.201601766] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Indexed: 11/08/2022]
Abstract
Resonance-assisted hydrogen bonding (RAHB), a concept introduced by Gilli and co-workers in 1989, concerns a kind of intramolecular H-bonding strengthened by a conjugated π-system, usually in 6-, 8-, or 10-membered rings. This Review highlights the involvement of RAHB as a driving force in the synthesis of organic, coordination, and organometallic compounds, as a handy tool in the activation of covalent bonds, and in starting moieties for synthetic transformations. The unique roles of RAHB in molecular recognition and switches, E/Z isomeric resolution, racemization and epimerization of amino acids and chiral amino alcohols, solvatochromism, liquid-crystalline compounds, and in synthons for crystal engineering and polymer materials are also discussed. The Review can provide practical guidance for synthetic chemists that are interested in exploring and further developing RAHB-assisted synthesis and design of materials.
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Affiliation(s)
- Kamran T Mahmudov
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal. .,Department of Chemistry, Baku State University, Z. Xalilov Str. 23, Az 1148, Baku, Azerbaijan.
| | - Armando J L Pombeiro
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal.
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16
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The Effect of Solvent on Tautomerism, Acidity and Radical Stability of Curcumin and Its Derivatives Based on Thermodynamic Quantities. J SOLUTION CHEM 2016. [DOI: 10.1007/s10953-016-0481-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Synthesis, structure and biological activity of 3(5)-trifluoromethyl-1H-pyrazoles derived from hemicurcuminoids. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.07.055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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18
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Babjaková E, Dastychová L, Hanulíková B, Kuřitka I, Nečas M, Vašková H, Vícha R. Synthesis, molecular structure and vibrational spectra of 1,3-bis(1-adamantyl)-2-phenylpropan-1,3-diones. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.12.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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19
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Ni F, Yang Y, Shu WM, Ma JR, Wu AX. Brønsted acid promoted addition–cyclization and C–C bond cleavage: a convenient synthesis of 2-amino-5-aroylmethylthiazoles derivatives. Org Biomol Chem 2014; 12:9466-70. [DOI: 10.1039/c4ob01519c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Verma PK, Koch F, Steinbacher A, Nuernberger P, Brixner T. Ultrafast UV-Induced Photoisomerization of Intramolecularly H-Bonded Symmetric β-Diketones. J Am Chem Soc 2014; 136:14981-9. [DOI: 10.1021/ja508059p] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Pramod Kumar Verma
- Institut für Physikalische
und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Federico Koch
- Institut für Physikalische
und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Andreas Steinbacher
- Institut für Physikalische
und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Patrick Nuernberger
- Institut für Physikalische
und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Tobias Brixner
- Institut für Physikalische
und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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21
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Ferreira PJ, Pinto da Silva L, Duarte DJ, Miranda MS, Esteves da Silva JC. A computational study of the structure, aromaticity and enthalpy of formation of UVA filter 4-tert-butyl-4′-methoxydibenzoylmethane. COMPUT THEOR CHEM 2014. [DOI: 10.1016/j.comptc.2014.03.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Pinto da Silva L, Ferreira PJO, Duarte DJR, Miranda MS, Esteves da Silva JCG. Structural, Energetic, and UV–Vis Spectral Analysis of UVA Filter 4-tert-Butyl-4′-methoxydibenzoylmethane. J Phys Chem A 2014; 118:1511-8. [DOI: 10.1021/jp4123375] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luís Pinto da Silva
- Centro
de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, P-4169-007 Porto, Portugal
| | - Paulo J. O. Ferreira
- Centro
de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, P-4169-007 Porto, Portugal
| | - Darío J. R. Duarte
- Laboratorio de Estructura Molecular y Propiedades, Área de Química Física-Departamento
de Química, Facultad de
Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Avenida Libertad 5460, (3400) Corrientes, Argentina
| | - Margarida S. Miranda
- Centro de Geologia da Universidade do Porto, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, P-4169-007 Porto, Portugal
| | - Joaquim C. G. Esteves da Silva
- Centro
de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, s/n, P-4169-007 Porto, Portugal
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23
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Shamsutdinova NA, Podyachev SN, Sudakova SN, Mustafina AR, Zairov RR, Burilov VA, Nizameev IR, Rizvanov IK, Syakaev VV, Gabidullin BM, Katsuba SA, Gubaidullin AT, Safiullin GM, Dehaen W. A facile synthetic route to convert Tb(iii) complexes of novel tetra-1,3-diketone calix[4]resorcinarene into hydrophilic luminescent colloids. NEW J CHEM 2014. [DOI: 10.1039/c4nj00637b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Luminescent hydrophilic core–shell nanoparticles are synthesized through reprecipitation and polyelectrolyte deposition techniques from Tb(iii) complexes.
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Affiliation(s)
- Nataliya A. Shamsutdinova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Sergey N. Podyachev
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Svetlana N. Sudakova
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Asiya R. Mustafina
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Rustem R. Zairov
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | | | - Irek R. Nizameev
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Ildar Kh. Rizvanov
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Victor V. Syakaev
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Bulat M. Gabidullin
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Sergey A. Katsuba
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Aidar T. Gubaidullin
- A. E. Arbuzov Institute of Organic and Physical Chemistry
- Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Georgy M. Safiullin
- Zavoisky Physical -Technical Institute of Kazan Scientific Center of Russian Academy of Sciences
- Kazan, Russia
| | - Wim Dehaen
- Department of Chemistry
- KU Leuven
- 3001 Leuven, Belgium
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24
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Durlak P, Latajka Z. Car–Parrinello and path integral molecular dynamics study of the intramolecular hydrogen bonds in the crystals of benzoylacetone and dideuterobenzoylacetone. Phys Chem Chem Phys 2014; 16:23026-37. [DOI: 10.1039/c4cp02569e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dynamics of the intramolecular short hydrogen bond in the molecular crystal of benzoylacetone and its deuterated analogue are investigated using ab initio molecular dynamics simulations.
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Affiliation(s)
- Piotr Durlak
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław, Poland
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25
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Jones RC, Herasymchuk K, Mahdi T, Petrov A, Resanović S, Vaughan DG, Lough AJ, Quail JW, Koivisto BD, Wylie RS, Gossage RA. Tautomerism and metal complexation of 2-acylmethyl-2-oxazolines: a combined synthetic, spectroscopic, crystallographic and theoretical treatment. Org Biomol Chem 2013; 11:3484-93. [PMID: 23591452 DOI: 10.1039/c3ob25867j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A synthetic, structural and theoretical investigation into the solid-state, solution and gas phase structure(s) of six 2-acylmethyl-4,4-dimethyl-2-oxazolines is reported. Four of these materials, viz.α-[(4,5-dihydro-4,4-dimethyl-2-oxazolyl)methylene]benzenemethanol (3a), α-[(4,5-dihydro-4,4-dimethyl-2-oxazolyl)methylene]-(4-nitrobenzene)methanol (3b), 1-(4,5-dihydro-4,4-dimethyl-2-oxazolyl)-3,3-dimethyl-1-buten-2-ol (3d) and (E)-1-phenyl-2-((3aR)-3,3a,8,8a-tetrahydro-2H-indeno[1,2-d]oxazol-2-ylidene)ethanone (3f) have been characterised in the solid-state by single crystal X-ray diffraction studies. These data represent the first solid-state structural studies of this class of compounds and details the first synthesis and full characterisation of chiral derivative 3f. All four of these materials are shown to exist in the solid phase in the enamine tautomeric form (e.g., 3a is best described as 2-[4,4-dimethyl-2-oxazolidinylidene]-1-phenylethanone) and it is suggested (NMR, IR) that this isomeric form is likely also retained in solution (e.g., CDCl3) as the more stable isomer. An investigation of the relative gas phase stabilities of the three possible (i.e., the (Z)-enol, keto and enamine) isomers of all five compounds by DFT at the B3LYP/6-311G(d) level of theory confirms the latter as the most stable form. The energy differences between the enamine and keto tautomers have been calculated to be the lowest for derivative 3d. These results are compared and contrasted with the previously reported NMR studies of such compounds which have identified the keto form as being a minor (albeit solution) tautomer. Equilibrium solution tautomer distributions for 3d are found to be solvent dependent. The protonated form of 3a, isolated as the HSO4(-) salt (i.e.4a), has been further characterised in the solid state by single crystal X-ray diffraction. These data represent the first example of a protonated oxazoline to be structurally elucidated and confirms that upon protonation, the keto (oxazoline) tautomer is the energetically favoured form in the solid-state. This observation is further supported by DFT studies for the gas phase protonated forms of such materials. Further DFT (B3LYP/6-311G(d)) calculations employing the SM8 or SMD solvation models were then applied to address the observed solution isomeric distribution for 3d; these results corroborate the gas phase theoretical treatment and also yield values that predict the higher solution stability of the enamine form as observed, although they fail to account for the existence of the keto form as a minor solution state tautomer. To access the availability of an enol-form, via hypothetical de-protonation to the enolate, compound 3a was treated with hydrated Cu(NO3)2 in EtOH solution. The resulting isolated green-coloured product (5), the first metal derivative of this entire class of ligands, is best described (IR, X-ray diffraction) as a coordinated enolate complex, i.e., Cu(3a-H)2. Complex 5 crystallizes in the P21/c space group with four molecules in the unit cell. The coordination geometry around the formal Cu(2+) metal centre is determined to be highly distorted square planar in nature (τ4 = 0.442). TD-DFT is used to give a reasonable explanation for the intensity of the absorbance band observed in the visible region for solutions of 5. These latter experiments strongly suggest that the title class of compounds may have considerable potential as ligands in coordination chemistry and/or metal-mediated catalysis.
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Affiliation(s)
- Roderick C Jones
- School of Chemistry, University of Tasmania, Hobart, TAS 7001, Australia
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26
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Durlak P, Mierzwicki K, Latajka Z. Investigations of the Very Short Hydrogen Bond in the Crystal of Nitromalonamide via Car–Parrinello and Path Integral Molecular Dynamics. J Phys Chem B 2013; 117:5430-40. [DOI: 10.1021/jp312473b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Piotr Durlak
- Faculty
of Chemistry, University of Wrocław,
14 F. Joliot-Curie Street, 50-383 Wrocław, Poland
| | - Krzysztof Mierzwicki
- Faculty
of Chemistry, University of Wrocław,
14 F. Joliot-Curie Street, 50-383 Wrocław, Poland
| | - Zdzisław Latajka
- Faculty
of Chemistry, University of Wrocław,
14 F. Joliot-Curie Street, 50-383 Wrocław, Poland
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27
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Álvarez CM, Carrillo R, García-Rodríguez R, Miguel D. Stereoselective Aldol Addition to Rhenium(I) Complexes and Reversible Dimerization with Epimerization of the Metal Center. Chemistry 2013; 19:8285-93. [DOI: 10.1002/chem.201300412] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Indexed: 11/10/2022]
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28
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Ferrari E, Asti M, Benassi R, Pignedoli F, Saladini M. Metal binding ability of curcumin derivatives: a theoretical vs. experimental approach. Dalton Trans 2013; 42:5304-13. [PMID: 23403470 DOI: 10.1039/c3dt33072a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Theoretical calculations employing DFT at the B3LYP/6-311G++** level are used to investigate the tautomeric equilibrium in curcumin derivatives. The solvent effect is evaluated using the CPCM continuum solvation method. The results are compared with experimental data obtained from the X-ray crystal structure of K2A23 and UV-vis data. The KE tautomer is more stable in a vacuum and in the solid state, while in water the DK tautomer reaches a population of 90%. In agreement with spectroscopic data, theoretical calculations predict a slight prevalence of the DK form in non-aqueous solvent systems. The ability to chelate metal ions [Fe(3+), Ga(3+) and Cu(2+)] is then explored by means of (1)H, (13)C NMR and UV-Vis spectroscopy. From the calculation of the overall stability constants of metal complexes and (1)H NMR titrations with Ga(3+), it is clear that the more stable species has a 1 : 2 M/L molar ratio. The curcuminoid coordinates the metal ion through the keto-enol function in the dissociated form; in addition 2D (1)H (13)C NMR experiments suggest the involvement of carboxylic oxygen in metal coordination it was found in the solid state for the complex [Ga(K2A33)2]PF6. The rate of the complexation reaction is strongly influenced by the type of substituent on the aromatic ring of the curcuminoid (K2A33 ≈ K2A23 ≫ K2A21). In addition DPPH assay evidences how antioxidant ability of curcumin derivatives is mainly due to the presence of a phenolic group and metal coordination by a keto-enolic moiety does not affect it, especially for K2A21.
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Affiliation(s)
- Erika Ferrari
- Department of Chemical and Geological Sciences, via Campi, 183, 41125 Modena, Italy.
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29
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Ravikumar K, Sridhar B, Hariharakrishnan V, Singh AN. Three novel benzothiazine-fused triazoles as potential centrally acting muscle relaxants. Acta Crystallogr C 2012; 68:o475-80. [PMID: 23124467 DOI: 10.1107/s0108270112040759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Accepted: 09/27/2012] [Indexed: 11/11/2022] Open
Abstract
The structures of the novel triazolobenzothiazines 2,4-dihydro-1H-benzo[b][1,2,4]triazolo[4,3-d][1,4]thiazin-1-one (IDPH-791), C(9)H(7)N(3)OS, (I), a potential muscle relaxant, its benzoyl derivative, 2-(2-oxo-2-phenylethyl)-2,4-dihydro-1H-benzo[b][1,2,4]triazolo[4,3-d][1,4]thiazin-1-one, C(20)H(17)N(3)O(4)S, (II), and the β-keto ester derivative, ethyl 3-oxo-2-(1-oxo-2,4-dihydro-1H-benzo[b][1,2,4]triazolo[4,3-d][1,4]thiazin-2-yl)-3-phenylpropanoate, C(17)H(13)N(3)O(2)S, (III), are the first examples of benzothiazine-fused triazoles in the crystallographic literature. The heterocyclic thiazine rings in all three structures adopt a distorted half-chair conformation. Compound (III) exists in the trans-β-diketo form. Other than N-H···O hydrogen bonds in (I) forming dimers, no formal intermolecular hydrogen bonds are involved in the crystal packing of any of the three structures, which is dominated by C-H···O/N and π-π stacking interactions.
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Affiliation(s)
- Krishnan Ravikumar
- Laboratory of X-ray Crystallography, CSIR Indian Institute of Chemical Technology, Hyderabad 500 007, India.
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30
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Durlak P, Latajka Z. Ab InitioMolecular Dynamics Study of the Very Short O–H···O Hydrogen Bonds in the Condensed Phases. J Chem Theory Comput 2012; 9:65-72. [DOI: 10.1021/ct300589r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Piotr Durlak
- Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Zdzisław Latajka
- Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland
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31
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Ravikumar K, Sridhar B, Nanubolu JB, Hariharakrishnan V, Singh AN. Structures of benzoxazine-fused triazoles as potential diuretic agents. Acta Crystallogr C 2012; 68:o302-7. [PMID: 22850856 DOI: 10.1107/s0108270112029800] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Accepted: 06/29/2012] [Indexed: 11/10/2022] Open
Abstract
6,8-Dinitro-2,4-dihydro-1H-benzo[b][1,2,4]triazolo[4,3-d][1,4]oxazin-1-one, C(9)H(5)N(5)O(6), (I), a potential diuretic, and its acetylacetone derivative (E)-2-(2-hydroxy-4-oxopent-2-en-3-yl)-6,8-dinitro-2,4-dihydro-1H-benzo[b][1,2,4]triazolo[4,3-d][1,4]oxazin-1-one, C(14)H(11)N(5)O(8), (II), both crystallize from methanol but in centrosymmetric and noncentrosymmetric space groups, respectively. To the best of our knowledge, this is the first report of crystal structures of benzoxazine-triazole fused systems. The acetylacetone group in (II) exists as the keto-enol tautomer and is oriented perpendicular to the triazol-3-one ring. Of the two nitro groups present, one is rotated significantly less than the other in both structures. The oxazine ring adopts a screw-boat conformation in (II), whereas it is almost planar in (I). N-H···N and N-H···O hydrogen bonds form centrosymmetric dimers in (I), while C-H···O interactions associate the molecules into helical columns in (II).
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Affiliation(s)
- Krishnan Ravikumar
- Laboratory of X-ray Crystallography, CSIR Indian Institute of Chemical Technology, Hyderabad, India.
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32
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Ferrari E, Pignedoli F, Imbriano C, Marverti G, Basile V, Venturi E, Saladini M. Newly synthesized curcumin derivatives: crosstalk between chemico-physical properties and biological activity. J Med Chem 2011; 54:8066-77. [PMID: 22029378 DOI: 10.1021/jm200872q] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
New curcumin analogues (ester and acid series) were synthesized with the aim to improve the chemical stability in physiological conditions and potential anticancer activity. Cytotoxicity against different tumorigenic cell lines (human ovarian carcinoma cells -2008, A2780, C13*, and A2780/CP, and human colon carcinoma cells HCT116 and LoVo) was tested to evaluate cellular specificity and activity. Physico-chemical properties such as acidity, lipophilicity, kinetic stability, and free radical scavenging activity were investigated to shed light on the structure-activity relationship and provide new attractive candidates for drug development. Most of ester derivatives show IC(50) values lower than curcumin and exhibit selectivity against colon carcinoma cells. Especially they are extremely active after 24 h exposure showing enhanced inhibitory effect on cell viability. The best performances of ester curcuminoids could be ascribed to their high lipophilicity that favors a greater and faster cellular uptake overcoming their apparently higher instability in physiological condition.
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Affiliation(s)
- Erika Ferrari
- Department of Chemistry, University of Modena and Reggio Emilia, Via Campi 183, 41125 Modena, Italy
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33
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Ferrari E, Saladini M, Pignedoli F, Spagnolo F, Benassi R. Solvent effect on keto–enol tautomerism in a new β-diketone: a comparison between experimental data and different theoretical approaches. NEW J CHEM 2011. [DOI: 10.1039/c1nj20576e] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Benassi R, Ferrari E, Lazzari S, Pignedoli F, Spagnolo F, Saladini M. How glucosylation triggers physical-chemical properties of curcumin: an experimental and theoretical study. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1750] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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35
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Poplaukhin P, Tiekink ERT. Interwoven coordination polymers sustained by tautomeric forms of the bridging ligand. CrystEngComm 2010. [DOI: 10.1039/b916585a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Priyadarsini KI. Photophysics, photochemistry and photobiology of curcumin: Studies from organic solutions, bio-mimetics and living cells. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2009. [DOI: 10.1016/j.jphotochemrev.2009.05.001] [Citation(s) in RCA: 292] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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37
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Thomas LH, Florence AJ, Wilson CC. Hydrogen atom behaviour imaged in a short intramolecular hydrogen bond using the combined approach of X-ray and neutron diffraction. NEW J CHEM 2009. [DOI: 10.1039/b908915b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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