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Ji G, Li X, Zhang J. Anti-Markovnikov Hydroacylation of Aryl Alkenes with Aldehydes Enabled by Photo/Cobalt Dual Catalysis. Org Lett 2025; 27:334-339. [PMID: 39731548 DOI: 10.1021/acs.orglett.4c04373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2024]
Abstract
Herein we describe a dual photo/cobalt-catalyzed anti-Markovnikov hydroacylation of aryl alkenes using aldehyde as acyl source. The key to success is the cobalt catalyzed hydrogen atom transfer, which enables effective formation of the desired products and efficient regeneration of the photocatalyst under mild conditions. This protocol features broad substrate scopes, good functional group tolerance, high efficiency and regioselectivity.
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Affiliation(s)
- Guanghao Ji
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei Province, People's Republic of China 430072
| | - Xuan Li
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei Province, People's Republic of China 430072
| | - Jing Zhang
- The Institute for Advanced Studies, Wuhan University, Wuhan, Hubei Province, People's Republic of China 430072
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Tang Z, Yao Z, Yu Y, Huang J, Ma X, Zhao X, Chang Z, Zhao D. Photoredox-Catalyzed [3+2] annulation of Aromatic Amides with Olefins via Iminium Intermediates. Angew Chem Int Ed Engl 2024; 63:e202412152. [PMID: 39425635 DOI: 10.1002/anie.202412152] [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: 06/28/2024] [Revised: 10/03/2024] [Accepted: 10/18/2024] [Indexed: 10/21/2024]
Abstract
Despite the preliminary success of transition metal-catalyzed [3+2] annulation of amides with olefins, the corresponding radical-type [3+2] annulation remains a laborious challenge. Herein we report the first photoredox-catalyzed radical-type [3+2] annulation of aromatic amides with olefins. We established an approach to generate unprecedented iminium radicals by reducing the oxyiminium intermediates, formed in situ from corresponding amides with Tf2O, via photoredox catalysis. The [3+2] annulation was achieved via stepwise radical process, instead of forming linear products via other pathways as previously reported. This annulation protocol exhibits excellent functional group tolerance, and a diversity of substrates are united under the photoredox conditions, affording iminium products that can be in situ diversified into 1-indanones, enamines and amines. Mechanistic investigations indicate reduction of the oxyiminium intermediate to the iminium radicals by excited-state of the photocatalyst initiates the catalytic cycle.
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Affiliation(s)
- Zhanyong Tang
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
| | - Zhenying Yao
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
| | - Yueyang Yu
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
| | - Jialin Huang
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
| | - Xiaoqiang Ma
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
| | - Xingda Zhao
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
| | - Zhe Chang
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
| | - Depeng Zhao
- State Key Laboratory of Anti-infective Drug Discovery and Development, School of Pharmaceutical Sciences, Sun Yat-Sen University, Waihuan East Road 132, Guangzhou, China
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Patel SS, Gupta S, Tripathi CB. Organocatalyzed Hydroacylation of Enones by Photosensitization of Acyl Silanes. Chem Asian J 2024:e202400240. [PMID: 38600748 DOI: 10.1002/asia.202400240] [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: 03/04/2024] [Revised: 04/10/2024] [Accepted: 04/10/2024] [Indexed: 04/12/2024]
Abstract
A mild protocol for hydroacylation of enones through photosensitization of acyl silanes with thioxanthone under blue light (455 nm) irradiation is reported. A Brønsted acid is used as a cocatalyst in the reaction. The versatility of the method is demonstrated through inter- and intramolecular hydroacylation reaction. The hydroacylation product is applied for synthesizing an anti-HCV agent. Mechanistic insights are also provided through control experiments.
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Affiliation(s)
- Shiv Shankar Patel
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Samiksha Gupta
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Chandra Bhushan Tripathi
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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Yang J, Wang C, Huang B, Zhou H, Li J, Liu X. Photoredox Catalytic Phosphine-Mediated Deoxygenative Hydroacylation of Azobenzenes with Carboxylic Acids. Org Lett 2024. [PMID: 38194307 DOI: 10.1021/acs.orglett.3c03875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
The convenient and precise preparation of N,N'-diarylhydrazides, especially from readily available raw materials, remains highly challenging. Here, a photoredox catalytic phosphine-mediated deoxygenative hydroacylation of azobenzenes with abundant and readily available carboxylic acids has been developed. With Ir[dF(CF3)ppy]2(dtbbpy)PF6 as the photocatalyst, the reactions proceeded smoothly in the presence of PPh3 under visible light irradiation, delivering various N,N'-diarylhydrazides in up to 92% yields. Mechanistic studies revealed that the reaction proceeds via photoredox catalysis and phosphoranyl-radical-mediated C-O bond cleavage of carboxylic acids.
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Affiliation(s)
- Jingya Yang
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Cunhui Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Bao Huang
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
| | - Hongyan Zhou
- College of Science, Gansu Agricultural University, Lanzhou 730070, China
| | - Jiangjiang Li
- College of Science, Gansu Agricultural University, Lanzhou 730070, China
| | - Xiaojun Liu
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
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Yang ML, Dong CL, Guan Z, He YH. Visible Light-Induced Hydroacylation of Benzylidenemalononitriles with Aroyl Chlorides Using Silane as a Hydrogen Donor. J Org Chem 2024. [PMID: 38163337 DOI: 10.1021/acs.joc.3c02616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
A novel photoredox-catalyzed direct hydroacylation of benzylidenemalononitriles is described. In this method, aroyl chlorides are employed as a readily available and affordable source of acyl groups, while commercially available tris(trimethylsilyl)silane acts as both the hydrogen atom donor and electron donor. By eliminating the requirement for complex synthesis of acyl precursors and hydrogen atom-transfer (HAT) reagents, this approach offers a convenient and efficient strategy for the hydroacylation of benzylidenemalononitriles.
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Affiliation(s)
- Ming-Lin Yang
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Chun-Lin Dong
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Zhi Guan
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Yan-Hong He
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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