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Geniller L, Ben Kraim H, Clot E, Taillefer M, Jaroschik F, Prieto A. Metal-Free Decarboxylative Allylation of Oxime Esters under Light Irradiation. Chemistry 2024; 30:e202401494. [PMID: 38785147 DOI: 10.1002/chem.202401494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 05/07/2024] [Accepted: 05/24/2024] [Indexed: 05/25/2024]
Abstract
Allylation reactions, often used as a key step for constructing complex molecules and drug candidates, typically rely on transition-metal (TM) catalysts. Even though TM-free radical allylations have been developed using allyl-stannanes, -sulfides, -silanes or -sulfones, much less procedures have been reported using simple and commercially available allyl halides, that are used for the preparation of the before-mentioned allyl derivatives. Here, we present a straightforward photocatalytic protocol for the decarboxylative allylation of oxime esters using allyl bromide derivatives under metal-free and mild conditions. This methodology yields a diverse variety of functionalized molecules including several pharmaceutically relevant molecules.
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Affiliation(s)
- Lilian Geniller
- ICGM, University of Montpellier, CNRS, ENSCM, 34000, Montpellier, France
| | - Hiba Ben Kraim
- ICGM, University of Montpellier, CNRS, ENSCM, 34000, Montpellier, France
| | - Eric Clot
- ICGM, University of Montpellier, CNRS, ENSCM, 34000, Montpellier, France
| | - Marc Taillefer
- ICGM, University of Montpellier, CNRS, ENSCM, 34000, Montpellier, France
| | - Florian Jaroschik
- ICGM, University of Montpellier, CNRS, ENSCM, 34000, Montpellier, France
| | - Alexis Prieto
- ICGM, University of Montpellier, CNRS, ENSCM, 34000, Montpellier, France
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Shibutani S, Nagao K, Ohmiya H. A Dual Cobalt and Photoredox Catalysis for Hydrohalogenation of Alkenes. J Am Chem Soc 2024; 146:4375-4379. [PMID: 38300804 DOI: 10.1021/jacs.3c10133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
We demonstrate hydrohalogenation of aliphatic alkenes with collidine·HX salts through dual photoredox/cobalt catalysis. The dual catalysis enables conversion of a proton and a halide anion from collidine·HX salt to a nucleophilic hydrogen radical equivalent and an electrophilic halogen radical equivalent and delivery of them to an alkene moiety. This protocol allows for introduction of fluorine, chlorine, bromine, or iodine atom to alkene, producing highly functionalized alkyl halides.
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Affiliation(s)
- Shotaro Shibutani
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Kazunori Nagao
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Hirohisa Ohmiya
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Wang FD, Wang C, Wang M, Yan H, Jiang J, Li P. Visible-light-induced halocyclization of 2-alkynylthioanisoles with simple alkyl halides towards 3-halobenzo[ b]thiophenes without an external photocatalyst. Org Biomol Chem 2023; 21:8170-8175. [PMID: 37782212 DOI: 10.1039/d3ob00860f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
A new strategy for the preparation of 3-halobenzo[b]thiophenes via a photo-driven halocyclization/demethylation of 2-alkynylthioanisoles with simple alkyl halides was developed. The reaction can proceed smoothly at room temperature under visible-light irradiation without any external photocatalyst, and the protocol has a range of advantages, including simplicity and mildness of the reaction conditions, good functional-group tolerance, and excellent yields of the products.
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Affiliation(s)
- Fen-Dou Wang
- College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China.
| | - Chunmiao Wang
- College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China.
| | - Min Wang
- College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China.
- Key Laboratory of Green and Precise Synthetic Chemistry and Applications, Ministry of Education; College of Chemistry and Materials Science, Huaibei Normal University, Huaibei, Anhui 235000, P.R. China.
| | - Han Yan
- College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China.
| | - Jin Jiang
- College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China.
| | - Pinhua Li
- College of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, P. R. China.
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Levitre G, Granados A, Molander GA. Sustainable Photoinduced Decarboxylative Chlorination Mediated by Halogen Atom Transfer. GREEN CHEMISTRY : AN INTERNATIONAL JOURNAL AND GREEN CHEMISTRY RESOURCE : GC 2023; 25:560-565. [PMID: 37588672 PMCID: PMC10427136 DOI: 10.1039/d2gc04578h] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Chlorinated organic backbones constitute important components in existing biologically active chemicals, and they are extraordinary useful intermediates in organic synthesis. Herein, an operationally simple and sustainable halodecarboxylation protocol via halogen-atom transfer (XAT) as a key step is presented. The method merges a metal-free photoredox system with (diacetoxyiodo)benzene (PIDA) as a hypervalent iodine reagent using 1,2-dihaloethanes as halogen sources to afford haloalkanes in an efficient manner. The sustainability of this protocol is highlighted by an important waste recovery protocol as well as by atom economy and carbon efficiency parameters.
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Affiliation(s)
- Guillaume Levitre
- Department of Chemistry, University of Pennsylvania, Roy and Diana Vagelos Laboratories 231 S. 34th Street, Philadelphia, PA 19104-6323 (USA)
| | - Albert Granados
- Department of Chemistry, University of Pennsylvania, Roy and Diana Vagelos Laboratories 231 S. 34th Street, Philadelphia, PA 19104-6323 (USA)
| | - Gary A Molander
- Department of Chemistry, University of Pennsylvania, Roy and Diana Vagelos Laboratories 231 S. 34th Street, Philadelphia, PA 19104-6323 (USA)
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Hao J, Ding W, Zheng Z, Sun L, Dong J, Li M, Wan W. Hantzsch Ester-Mediated Visible-Light-Induced Radical Ethoxycarbonyldifluoromethylation of Aryl Alkynes: Kinetic-Controlled Stereoselective Synthesis of Z- gem-Difluoroallyl Esters. J Org Chem 2022; 87:13828-13836. [DOI: 10.1021/acs.joc.2c01537] [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]
Affiliation(s)
- Jian Hao
- Department of Chemistry, Shanghai University, Shanghai 200444, China
| | - Wanjun Ding
- Department of Chemistry, Shanghai University, Shanghai 200444, China
| | - Zhichun Zheng
- Department of Chemistry, Shanghai University, Shanghai 200444, China
| | - Linan Sun
- Department of Chemistry, Shanghai University, Shanghai 200444, China
| | - Junjie Dong
- Department of Chemistry, Shanghai University, Shanghai 200444, China
| | - Minjie Li
- Department of Chemistry, Shanghai University, Shanghai 200444, China
| | - Wen Wan
- Department of Chemistry, Shanghai University, Shanghai 200444, China
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