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Nigríni M, Bhosale VA, Císařová I, Veselý J. Enantioenriched 1,4-Benzoxazepines via Chiral Brønsted Acid-Catalyzed Enantioselective Desymmetrization of 3-Substituted Oxetanes. J Org Chem 2023; 88:17024-17036. [PMID: 37987742 PMCID: PMC10729023 DOI: 10.1021/acs.joc.3c01929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/23/2023] [Accepted: 11/01/2023] [Indexed: 11/22/2023]
Abstract
Herein, we present a highly enantioselective desymmetrization of 3-substituted oxetanes enabled by a confined chiral phosphoric acid. This metal-free process allows effective access to chiral seven-membered 1,4-benzoxazepines with a high degree of enantiocontrol, under mild reaction conditions. The developed synthetic strategy tolerates a broad substrate scope and demonstrates its synthetic utility in various enantioselective product transformations, thus proving its effectiveness in diverse scenarios.
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Affiliation(s)
- Martin Nigríni
- Department
of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague 2, Czech Republic
| | - Viraj A. Bhosale
- Department
of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague 2, Czech Republic
| | - Ivana Císařová
- Department
of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague 2, Czech Republic
| | - Jan Veselý
- Department
of Organic Chemistry, Faculty of Science, Charles University, Hlavova 2030/8, 128 43 Prague 2, Czech Republic
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2
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Bi HY, Wu QY, Zhou XM, Xu HJ, Liang C, Mo DL, Ma XP. Chan-Lam Reaction and Lewis Acid Promoted 1,3-Rearrangement of N-O Bonds to Prepare N-(2-Hydroxyaryl)pyridin-2-ones. Org Lett 2022; 24:4675-4679. [PMID: 35713172 DOI: 10.1021/acs.orglett.2c01827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe the difunctionalization of arylboronic acids to prepare various N-(2-hydroxyaryl)pyridin-2-ones in good yields using N-hydroxypyridin-2-ones as the oxygen and nitrogen sources through a copper(II)-catalyzed Chan-Lam reaction and subsequent BF3-promoted selective 1,3-rearrangement of N-O bond in a one-pot procedure. Mechanistic studies reveal that the 1,3-rearrangement selectivity is controlled by the formation of the key aryloxypyridinium salt. The obtained products are easily converted to various useful pyridin-2-one scaffolds.
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Affiliation(s)
- Hong-Yan Bi
- College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China.,State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Qing-Yan Wu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Xiao-Mei Zhou
- College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China
| | - Hui-Juan Xu
- College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China
| | - Cui Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Dong-Liang Mo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Xiao-Pan Ma
- College of Pharmacy, Guilin Medical University, 1 Zhi Yuan Road, Guilin 541199, China
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3
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Chalyk B, Grynyova A, Filimonova K, Rudenko TV, Dibchak D, Mykhailiuk PK. Unexpected Isomerization of Oxetane-Carboxylic Acids. Org Lett 2022; 24:4722-4728. [PMID: 35766229 PMCID: PMC9490830 DOI: 10.1021/acs.orglett.2c01402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
![]()
Many
oxetane-carboxylic
acids were found to be unstable. They easily
isomerized into new (hetero)cyclic lactones while being stored at
room temperature or slightly heated. Chemists should keep in mind
the high instability of these molecules, as this could dramatically
affect the reaction yields and lead to negative results (especially
in those reactions that require heating).
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Affiliation(s)
- Bohdan Chalyk
- Enamine Ltd., Chervonotkatska 78, 02094 Kyiv, Ukraine.,Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Strasse 5, 02094 Kyiv, Ukraine
| | | | | | - Tymofii V Rudenko
- Enamine Ltd., Chervonotkatska 78, 02094 Kyiv, Ukraine.,Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Strasse 5, 02094 Kyiv, Ukraine
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4
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Rojas JJ, Torrisi E, Dubois MAJ, Hossain R, White AJP, Zappia G, Mousseau JJ, Choi C, Bull JA. Oxetan-3-ols as 1,2-bis-Electrophiles in a Brønsted-Acid-Catalyzed Synthesis of 1,4-Dioxanes. Org Lett 2022; 24:2365-2370. [PMID: 35311271 PMCID: PMC9007565 DOI: 10.1021/acs.orglett.2c00568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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Annulations
that combine diacceptors with bis-nucleophiles are
uncommon. Here, we report the synthesis of 1,4-dioxanes from 3-aryloxetan-3-ols,
as 1,2-bis-electrophiles and 1,2-diols. Brønsted acid Tf2NH catalyzes both the selective activation of the oxetanol,
to form an oxetane carbocation that reacts with the diol, and intramolecular
ring opening of the oxetane. High regio- and diastereoselectivity
are achieved with unsymmetrical diols. The substituted dioxanes and
fused bicyclic products present interesting motifs for drug discovery
and can be further functionalized.
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Affiliation(s)
- Juan J. Rojas
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K
| | - Elena Torrisi
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K
- Department of Biomolecular Sciences, School of Pharmacy, University of Urbino “Carlo Bo”, P.za Rinascimento, 6, 61029 Urbino (PU), Italy
| | - Maryne A. J. Dubois
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K
| | - Riashat Hossain
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K
| | - Andrew J. P. White
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K
| | - Giovanni Zappia
- Department of Biomolecular Sciences, School of Pharmacy, University of Urbino “Carlo Bo”, P.za Rinascimento, 6, 61029 Urbino (PU), Italy
| | - James J. Mousseau
- Pfizer Worldwide Research, Development and Medical, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Chulho Choi
- Pfizer Worldwide Research, Development and Medical, Eastern Point Road, Groton, Connecticut 06340, United States
| | - James A. Bull
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K
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5
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M. Honnanayakanavar J, Owk O, Suresh S. Recent Advances in the Tandem Copper-Catalyzed Ullmann-Goldberg N-Arylation–Cyclization Strategies. Org Biomol Chem 2022; 20:2993-3028. [DOI: 10.1039/d2ob00082b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N‒Aryl bond formation under copper catalysis has been playing a pivotal role and has been extensively used as a key step in the total syntheses of several therapeutic molecules. The...
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