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Roos CB, Chiang CH, Murray LAM, Yang D, Schulert L, Narayan ARH. Stereodynamic Strategies to Induce and Enrich Chirality of Atropisomers at a Late Stage. Chem Rev 2023; 123:10641-10727. [PMID: 37639323 DOI: 10.1021/acs.chemrev.3c00327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/31/2023]
Abstract
Enantiomers, where chirality arises from restricted rotation around a single bond, are atropisomers. Due to the unique nature of the origins of their chirality, synthetic strategies to access these compounds in an enantioselective manner differ from those used to prepare enantioenriched compounds containing point chirality arising from an unsymmetrically substituted carbon center. In particular stereodynamic transformations, such as dynamic kinetic resolutions, thermodynamic dynamic resolutions, and deracemizations, which rely on the ability to racemize or interconvert enantiomers, are a promising set of transformations to prepare optically pure compounds in the late stage of a synthetic sequence. Translation of these synthetic approaches from compounds with point chirality to atropisomers requires an expanded toolbox for epimerization/racemization and provides an opportunity to develop a new conceptual framework for the enantioselective synthesis of these compounds.
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Huth SE, Stone EA, Crotti S, Miller SJ. On the Ability of the N-O Bond to Support a Stable Stereogenic Axis: Peptide-Catalyzed Atroposelective N-Oxidation. J Org Chem 2023; 88:12857-12862. [PMID: 37561942 DOI: 10.1021/acs.joc.3c01385] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
During studies of atroposelective, peptide-catalyzed N-oxidations of pyridines, we observed lower-than-expected barriers to atropisomerization for these stereodynamic processes under the reaction conditions. Mechanistic studies indicate a hydrogen bond-assisted racemization mechanism intrinsic to both the starting materials and products. We also identified a protonation-dependent barrier to rotation that operates for the starting materials alone. Nonetheless, several substrates were amenable to atroposelective N-oxidations via kinetic resolution, yielding krel values of up to 12.6 and the isolation of one N-oxide with >99:1 er after recrystallization.
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Affiliation(s)
- Susannah E Huth
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Elizabeth A Stone
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Simone Crotti
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Scott J Miller
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
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Tuncel ST, Demir I, Erdem SS, Dogan I. Stable hemiaminals from axially chiral pyridine compounds. Chirality 2023; 35:365-375. [PMID: 36762682 DOI: 10.1002/chir.23545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 01/19/2023] [Accepted: 01/29/2023] [Indexed: 02/11/2023]
Abstract
In this study, we have synthesized a series of 3-(pyridin-2-yl)-2-(pyridin-2-ylimino)thiazolidin-4-ol derivatives regioselectively from 2-iminothiazolidin-4-ones using LiAlH4 at room temperature. Due to the presence of the restricted rotation around the N3-Caryl single bond, the formation of M/P isomers was observed. The OH group of the hemiaminal was found to orient itself on the same side with pyridyl nitrogen during this restricted rotation to form an intramolecular hydrogen bond, which was demonstrated by the computational DFT study. This orientation presumably inhibited the occurrence of dehydration and stabilized the molecule.
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Affiliation(s)
| | - Ilke Demir
- Department of Chemistry, Marmara University, Istanbul, Turkey
| | | | - Ilknur Dogan
- Department of Chemistry, Bogazici University, Istanbul, Turkey
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Bulak E, Dogan I, Varnali T, Schwederski B, Gunal SE, Lönnecke P, Bubrin M, Kaim W. An Acyclic Diaminocarbene Complex of Platinum Formed by Desulfurization of 1,3‐Bis(3‐methylpyridin‐2‐yl)thiourea. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ece Bulak
- Bogazici University Department of Chemistry, Bebek 34342 Istanbul Turkey
| | - Ilknur Dogan
- Bogazici University Department of Chemistry, Bebek 34342 Istanbul Turkey
| | - Tereza Varnali
- Bogazici University Department of Chemistry, Bebek 34342 Istanbul Turkey
| | - Brigitte Schwederski
- University of Stuttgart Institute of Inorganic Chemistry Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Sule Erol Gunal
- Bogazici University Department of Chemistry, Bebek 34342 Istanbul Turkey
| | - Peter Lönnecke
- University of Leipzig Fakultät für Chemie und Mineralogie Johannisallee 29 04103 Leipzig Germany
| | - Martina Bubrin
- University of Stuttgart Institute of Inorganic Chemistry Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Wolfgang Kaim
- University of Stuttgart Institute of Inorganic Chemistry Pfaffenwaldring 55 70569 Stuttgart Germany
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Carraro Junior LR, Alves AG, Rech TDST, Campos Júnior JC, Siqueira GM, Cunico W, Brüning CA, Bortolatto CF. Three -(pyridin-2-yl)-2-(pyridin-2-ylimino)thiazolidin-4-one as a novel inhibitor of cerebral MAO-B activity with antioxidant properties and low toxicity potential. J Biochem Mol Toxicol 2021; 35:e22833. [PMID: 34047428 DOI: 10.1002/jbt.22833] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 01/21/2021] [Accepted: 05/18/2021] [Indexed: 11/12/2022]
Abstract
Some brain diseases are associated with oxidative stress and altered monoamine oxidase (MAO) activity. The objective of this study was to evaluate the antioxidant and neuroprotective actions through MAO inhibition of 3-(pyridin-2-yl)-2-(pyridine-2-ylimino) thiazolidin-4-one (PPIT, a synthetic molecule containing a thiazolidinone nucleus), as well as its effects on toxicity parameters in Swiss female mice. Five in vitro assays were carried out to verify the PPIT antioxidant capacity: protein carbonylation (PC), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), 1,1-diphenyl-2-picryl-hydrazil (DPPH), ferric ion (Fe3+ ) reducing antioxidant power (FRAP), and superoxide dismutase (SOD)-like activity. The results showed that PPIT reduced the level of PC in the homogenate of the brain. This compound did not demonstrate SOD mimetic activity, but it acted as a free radical scavenger (ABTS and DPPH) and exhibited reducing activity in the FRAP assay. In addition, the effects of PPIT on cerebral MAO activity (MAO-A and B isoforms) were investigated in vitro. Our data revealed inhibition of the MAO-B activity by PPIT with no effects on MAO-A. Lastly, an acute oral toxicity test was conducted in mice. No changes in food intake, body weight, and biochemical markers of kidney and liver damage were detected in mice treated with a high dose of PPIT (300 mg/kg). In conclusion, the present study demonstrated that PPIT exhibits antioxidant activity and selectively inhibits the MAO-B isoform without causing apparent toxicity. These findings suggest PPIT as a potential therapeutic candidate to be tested in preclinical models of brain diseases involving perturbations of MAO-B activity and redox status.
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Affiliation(s)
- Luiz Roberto Carraro Junior
- Programa de Pós-graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brasil
| | - Amália Gonçalves Alves
- Programa de Pós-graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brasil
| | - Taís da Silva Teixeira Rech
- Programa de Pós-graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brasil
| | - José Coan Campos Júnior
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Química Aplicada a Bioativos (LaQuiABio), Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, UFPel, Pelotas, RS, Brasil
| | - Geonir Machado Siqueira
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Química Aplicada a Bioativos (LaQuiABio), Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, UFPel, Pelotas, RS, Brasil
| | - Wilson Cunico
- Programa de Pós-Graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Química Aplicada a Bioativos (LaQuiABio), Centro de Ciências Químicas, Farmacêuticas e de Alimentos, Universidade Federal de Pelotas, UFPel, Pelotas, RS, Brasil
| | - César Augusto Brüning
- Programa de Pós-graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brasil
| | - Cristiani Folharini Bortolatto
- Programa de Pós-graduação em Bioquímica e Bioprospecção (PPGBBio), Laboratório de Bioquímica e Neurofarmacologia Molecular (LABIONEM), Grupo de Pesquisa em Neurobiotecnologia (GPN), Centro de Ciências Químicas, Farmacêuticas e de Alimentos (CCQFA), Universidade Federal de Pelotas (UFPel), Pelotas, RS, Brasil
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Hassan AA, Aly AA, Ramadan M, Mohamed NK, Tawfeek HN, Bräse S, Nieger M. Stereoselective synthesis of 2-(2,4-dinitrophenyl)hydrazono- and (2-tosylhydrazono)-4-oxo-thiazolidine derivatives and screening of their anticancer activity. MONATSHEFTE FUR CHEMIE 2020. [DOI: 10.1007/s00706-020-02671-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Tuncel ST, Gunal SE, Ekizoglu M, Gokhan Kelekci N, Erdem SS, Bulak E, Frey W, Dogan I. Thioureas and their cyclized derivatives: Synthesis, conformational analysis and antimicrobial evaluation. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.10.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Affiliation(s)
- Alaa A. Hassan
- Chemistry Department, Faculty of Science; Minia University; El-Minia 61519 Egypt
| | - Maysa M. Makhlouf
- Chemistry Department, Faculty of Science; Minia University; El-Minia 61519 Egypt
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Liang MM, Ma YY, Zhu L, Jia YJ, Zhu HJ, Li W, Zhou BD. Experimental and theoretical investigation of stable diastereomeric conformations of biscarboline amides in solution. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.06.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hasegawa F, Kawamura K, Tsuchikawa H, Murata M. Stable C-N axial chirality in 1-aryluracil scaffold and differences in in vitro metabolic clearance between atropisomers of PDE4 inhibitor. Bioorg Med Chem 2017; 25:4506-4511. [PMID: 28698053 DOI: 10.1016/j.bmc.2017.06.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 06/22/2017] [Accepted: 06/26/2017] [Indexed: 10/19/2022]
Abstract
We report herein the stable C-N axial chirality in a 1-phenyl-6-aminouracil scaffold owing to the presence of various functional groups at the ortho-position of the N(1)-phenyl group. Racemic 1-phenyl-6-aminouracils were first separated by chiral HPLC or converting them to the corresponding diastereomers using a chiral resolving agent. We then determined the rotational barrier of each atropisomer by a thermal racemization method and found that these compounds have rotational barriers similar to other C-N axially chiral biaryls. In addition, there was a good correlation between the rotational barriers and van der Waals radii of an ortho-substituent of the N(1)-phenyl group. To explore the possibility of the chiral 1-phenyl-6-aminouracil scaffold as a drug lead, we synthesized both atropisomers as phosphodiesterase-4 inhibitors 10. The atropisomers showed significantly different metabolic stabilities while their PDE4 inhibitory activities were somewhat similar. This finding demonstrates the potential utility of stable C-N bond atropisomers in the development of chiral drugs.
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Affiliation(s)
- Futoshi Hasegawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Kazushi Kawamura
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Hiroshi Tsuchikawa
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
| | - Michio Murata
- Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
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12
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Dong H, Zhang D, Lin H, Wang Y, Liu L, Zheng M, Li X, Zhang C, Li J, Zhang P, So J. A surface molecularly imprinted polymer as chiral stationary phase for chiral separation of 1,1′-binaphthalene-2-naphthol racemates. Chirality 2017; 29:340-347. [DOI: 10.1002/chir.22710] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 03/13/2017] [Accepted: 04/01/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Hongxing Dong
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Danxia Zhang
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Hailong Lin
- COFCO Nutrition & Health Research Institute; Beijing China
| | - Yudan Wang
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Lijia Liu
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Meixia Zheng
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Xiaobo Li
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Chunhong Zhang
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Junqing Li
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
| | - Peng Zhang
- College of Power and Energy Engineering; Harbin Engineering University; Harbin China
| | - Juhyok So
- Institute of Advanced Marine Materials, Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, College of Material Science and Chemical Engineering; Harbin Engineering University; Harbin China
- Department of Chemistry; University of Science; Pyongyang Democratic People's Republic of Korea
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