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Otake C, Namba T, Tabata H, Makino K, Hirano K, Oshitari T, Natsugari H, Kusumi T, Takahashi H. Conformational Preference of 2'-Fluoro-Substituted Acetophenone Derivatives Revealed by Through-Space 1H- 19F and 13C- 19F Spin-Spin Couplings. J Org Chem 2021; 86:4638-4645. [PMID: 33645981 PMCID: PMC8154564 DOI: 10.1021/acs.joc.1c00051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
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The conformational properties of
2′-fluoro-substituted acetophenone
derivatives were elucidated based on Hα–F
and Cα–F through-space spin–spin couplings
(TS-couplings), which occur between two atoms constrained at a distance
smaller than the sum of their van der Waals radii. This study revealed
that 2′-fluoro-substituted acetophenone derivatives in solutions
form exclusively s-trans conformers
by analyzing their NMR spectra focused on the TS-couplings. The magnitudes
of the coupling constants 5J (Hα, F) and 4J (Cα, F)
correlate linearly with the value of the dielectric constant of the
solvents. Furthermore, s-trans conformations
of the two derivatives were confirmed by X-ray crystallographic analysis.
These conformational preferences were consistent with the DFT calculations.
The s-cis conformer, in which fluorine
and oxygen atoms lie in a syn-periplanar mode, may
be subject to strong repulsion between the two polar atoms and become
unstable. The s-trans preference
of the 2′-fluoro-substituted acetophenone derivatives may be
utilized in drug design.
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Affiliation(s)
- Chinatsu Otake
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Takuya Namba
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Hidetsugu Tabata
- Faculty of Pharma Sciences, Teikyo University, 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan
| | - Kosho Makino
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
| | - Kiriko Hirano
- Bruker Japan K.K., 3-9 Moriya, Kanagawa-ku, Yokohama, Kanagawa 221-0022, Japan
| | - Tetsuta Oshitari
- Faculty of Pharma Sciences, Teikyo University, 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan
| | - Hideaki Natsugari
- Graduate School of Pharmaceutical Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Takenori Kusumi
- Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japan
| | - Hideyo Takahashi
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641Yamazaki, Noda-shi, Chiba 278-8510, Japan
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2
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Čapkauskaitė E, Zakšauskas A, Ruibys V, Linkuvienė V, Paketurytė V, Gedgaudas M, Kairys V, Matulis D. Benzimidazole design, synthesis, and docking to build selective carbonic anhydrase VA inhibitors. Bioorg Med Chem 2017; 26:675-687. [PMID: 29305297 DOI: 10.1016/j.bmc.2017.12.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 12/15/2017] [Accepted: 12/22/2017] [Indexed: 10/18/2022]
Abstract
The similarity of human carbonic anhydrase (CA) active sites makes it difficult to design selective inhibitors for one or several CA isoforms that are drug targets. Here we synthesize a series of compounds that are based on 5-[2-(benzimidazol-1-yl)acetyl]-2-chloro-benzenesulfonamide (1a) which demonstrated picomolar binding affinity and significant selectivity for CA isoform five A (VA), and explain the structural influence of inhibitor functional groups to the binding affinity and selectivity. A series of chloro-substituted benzenesulfonamides bearing a heterocyclic tail, together with molecular docking, was used to build inhibitors that explore substituent influence on the binding affinity to the CA VA isoform.
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Key Words
- 3,4-Dihydro-2H-quinoline
- CA inhibitor
- Carbonic anhydrase isozyme I, II, III, IV, VA, VB, VI, VII, IX, XII, XIII, and XIV
- Docking
- Fluorescent thermal shift assay
- Imidazole
- Indoline
- N-Alkylated benzimidazole
- Sulfonamide
- ThermoFluor®
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Affiliation(s)
- Edita Čapkauskaitė
- Department of Biothermodynamics and Drug Design, Institute of Biotechnology, Vilnius University, Saulėtekio al. 7, Vilnius LT-10257, Lithuania
| | - Audrius Zakšauskas
- Department of Biothermodynamics and Drug Design, Institute of Biotechnology, Vilnius University, Saulėtekio al. 7, Vilnius LT-10257, Lithuania
| | - Virginijus Ruibys
- Department of Organic Chemistry, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko 24, Vilnius LT-03225, Lithuania
| | - Vaida Linkuvienė
- Department of Biothermodynamics and Drug Design, Institute of Biotechnology, Vilnius University, Saulėtekio al. 7, Vilnius LT-10257, Lithuania
| | - Vaida Paketurytė
- Department of Biothermodynamics and Drug Design, Institute of Biotechnology, Vilnius University, Saulėtekio al. 7, Vilnius LT-10257, Lithuania
| | - Marius Gedgaudas
- Department of Biothermodynamics and Drug Design, Institute of Biotechnology, Vilnius University, Saulėtekio al. 7, Vilnius LT-10257, Lithuania
| | - Visvaldas Kairys
- Department of Bioinformatics, Institute of Biotechnology, Vilnius University, Saulėtekio al. 7, Vilnius LT-10257, Lithuania
| | - Daumantas Matulis
- Department of Biothermodynamics and Drug Design, Institute of Biotechnology, Vilnius University, Saulėtekio al. 7, Vilnius LT-10257, Lithuania.
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3
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Chalifoux WA, Reznik SK, Leighton JL. Direct and highly regioselective and enantioselective allylation of β-diketones. Nature 2012; 487:86-9. [PMID: 22763452 PMCID: PMC3393786 DOI: 10.1038/nature11189] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 05/04/2012] [Indexed: 11/09/2022]
Abstract
The enantioselective allylation of ketones is a problem of fundamental importance in asymmetric reaction design, especially given that only a very small number of methods can generate tertiary carbinols. Despite the vast amount of attention that synthetic chemists have given to this problem, success has generally been limited to just a few simple ketone types. A method for the selective allylation of functionally complex ketones would greatly increase the utility of ketone allylation methods in the chemical synthesis of important targets. Here we describe the operationally simple, direct, regioselective and enantioselective allylation of β-diketones. The strong tendency of β-diketones to act as nucleophilic species was overcome by using their enol form to provide the necessary Brønsted-acid activation. This reaction significantly expands the pool of enantiomerically enriched and functionally complex tertiary carbinols that may be easily accessed. It also overturns more than a century of received wisdom regarding the reactivity of β-diketones.
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Affiliation(s)
- Wesley A Chalifoux
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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4
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Merza MY, El-Bermani MF. Estimations of excited state dipole moments of conformers in some o-substituted acetophenones by solvato-chromic shifts. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2004; 60:1677-1683. [PMID: 15147713 DOI: 10.1016/j.saa.2003.09.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2002] [Revised: 08/25/2003] [Accepted: 09/05/2003] [Indexed: 05/24/2023]
Abstract
Ultra violet absorption spectra of o-methylacetophenone, o-fluoroacetophenone and o-hydroxyacetophenone solutions in different solvents are recorded in the region 200-350 nm at room temperature. Excited state dipole moments for three (pi* <-- pi) transitions of the benzene ring for solutions in non-polar and polar solvents are estimated using solvato-chromic shift method [Delta nu against f(epsilon, n)]. The results show that two types of shifts are observed red and blue shifts. The dipole moment values obtained on excitation by red shifted bands in non-polar solvents are much higher than their counterparts both in the ground state and those of the solutions in polar solvents. Those obtained on excitation by blue shifted bands have lower values than ground state, some with same direction and others of reverse direction in both non-polar and polar solvents.
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Affiliation(s)
- Mohammed Y Merza
- Department of Chemistry, College of Science, University of Baghdad, Al-Jadryah, Baghdad, Iraq
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5
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Gussoni M, Rui M, Zerbi G. Electronic and relaxation contribution to linear molecular polarizability. An analysis of the experimental values. J Mol Struct 1998. [DOI: 10.1016/s0022-2860(97)00292-5] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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