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Zang Y, Ma Y, Xu Q, Li G, Chen N, Li X, Zhu F. TiCl 4-mediated deoxygenative reduction of aromatic ketones to alkylarenes with ammonia borane. Org Biomol Chem 2024; 22:932-939. [PMID: 38180250 DOI: 10.1039/d3ob01977b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
A rapid and mild protocol for the exhaustive deoxygenation of various aromatic ketones to corresponding alkanes was described, which was mediated by TiCl4 and used ammonia borane (AB) as the reductant. This reduction protocol applies to a wide range of substrates in moderate to excellent yields at room temperature. The gram-scale reaction and syntheses of some key building blocks for SGLT2 inhibitors demonstrated the practicability of this methodology. Preliminary mechanistic studies revealed that the ketone is first converted into an alcohol, which then undergoes a carbocation to give the alkane via hydrogenolysis.
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Affiliation(s)
- Yongjun Zang
- Anhui Province Key Laboratory for Quality Evaluation and Improvement of Traditional Chinese Medicine, Department of Biological and Pharmaceutical Engineering, West Anhui University, Lu'an, 237012, Anhui, P.R. China.
| | - Yunfeng Ma
- Anhui Anlito Biological Technology Co., Ltd, Anhui Huoshan Economic and Technological Development Zone, 237200, Anhui, P.R. China
| | - Qilin Xu
- Anhui Province Key Laboratory for Quality Evaluation and Improvement of Traditional Chinese Medicine, Department of Biological and Pharmaceutical Engineering, West Anhui University, Lu'an, 237012, Anhui, P.R. China.
| | - Guosi Li
- Anhui Province Key Laboratory for Quality Evaluation and Improvement of Traditional Chinese Medicine, Department of Biological and Pharmaceutical Engineering, West Anhui University, Lu'an, 237012, Anhui, P.R. China.
| | - Naidong Chen
- Anhui Province Key Laboratory for Quality Evaluation and Improvement of Traditional Chinese Medicine, Department of Biological and Pharmaceutical Engineering, West Anhui University, Lu'an, 237012, Anhui, P.R. China.
| | - Xing Li
- College of Pharmacy and Chemistry & Chemical Engineering, Taizhou University, Taizhou, 225300, Jiangsu, P.R. China.
| | - Fucheng Zhu
- Anhui Province Key Laboratory for Quality Evaluation and Improvement of Traditional Chinese Medicine, Department of Biological and Pharmaceutical Engineering, West Anhui University, Lu'an, 237012, Anhui, P.R. China.
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2
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Wan X, Wang D, Huang H, Mao GJ, Deng GJ. Radical-mediated photoredox hydroarylation with thiosulfonate. Chem Commun (Camb) 2023; 59:2767-2770. [PMID: 36786060 DOI: 10.1039/d2cc05948g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Herein, we report a novel visible light-induced photocatalytic system that enables intramolecular hydroarylation of unactivated alkenes. Thiosulfonate compounds were found to be the key radical precursor that mediates the Minisci-type intramolecular cyclization reaction. Under the optimal reaction conditions, a wide range of pyridyquinazolinone and pyrroloquinazolinone products were obtained in moderate to good yields.
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Affiliation(s)
- Xiaoyuan Wan
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.
| | - Dahan Wang
- Department of Food and Chemical Engineering, Shaoyang University, Shaoyang, 422100, China
| | - Huawen Huang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.
| | - Guo-Jiang Mao
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, P. R. China
| | - Guo-Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.
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Mohamadpour F. Carbazole-based photocatalyst (4CzIPN) as a novel donor-acceptor (D-A) fluorophore catalyzed gram-scale 2-amino-4H-chromene scaffolds photosynthesis via a proton-coupled electron transfer (PCET) process. J Taiwan Inst Chem Eng 2023. [DOI: 10.1016/j.jtice.2023.104699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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4
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Abdukader A, Abdukerem D, Liu C. Photoredox aerobic oxidative cycliation of N-arylacrylamides with benzylalcohols. Org Biomol Chem 2022; 20:9282-9286. [PMID: 36383155 DOI: 10.1039/d2ob01865a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
While the radical coupling/cyclization of N-arylacrylamides has been well established for the synthesis of functionalized oxindoles, in the present work, a visible-light-induced aerobic oxidative coupling/cyclization reaction of N-arylacrylamides with benzylalcohols has been developed. The combination of LiBr and benzophenone as the additive was found to be highly effective to enhance the catalytic efficacy. This protocol offers a mild alternative access to structurally valuable hydroxyalkyl oxindoles. Mechanistic studies reveal that the bromo radical in situ formed through the photoredox SET process under aerobic conditions enables efficient HAT to generate the key hydroxyalkyl radical intermediate.
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Affiliation(s)
- Ablimit Abdukader
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, P R China.
| | - Dilshat Abdukerem
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, P R China.
| | - Changhong Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, P R China.
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Matsuo B, Granados A, Majhi J, Sharique M, Levitre G, Molander GA. 1,2-Radical Shifts in Photoinduced Synthetic Organic Transformations: A Guide to the Reactivity of Useful Radical Synthons. ACS ORGANIC & INORGANIC AU 2022; 2:435-454. [PMID: 36510615 PMCID: PMC9732885 DOI: 10.1021/acsorginorgau.2c00032] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 07/27/2022] [Accepted: 07/27/2022] [Indexed: 12/16/2022]
Abstract
The exploration of 1,2-radical shift (RS) mechanisms in photoinduced organic reactions has provided efficient routes for the generation of important radical synthons in many chemical transformations. In this Review, the basic concepts involved in the traditional 1,2-spin-center shift (SCS) mechanisms in recently reported studies are discussed. In addition, other useful 1,2-RSs are addressed, such as those proceeding through 1,2-group migrations in carbohydrate chemistry, via 1,2-boron shifts, and by the generation of α-amino radicals. The discussion begins with a general overview of the basic aspects of 1,2-RS mechanisms, followed by a demonstration of their applicability in photoinduced transformations. The sections that follow are organized according to the mechanisms operating in combination with the 1,2-radical migration event. This contribution is not a comprehensive review but rather aims to provide an understanding of the topic, focused on the more recent advances in the field, and establishes a definition for the nomenclature that has been used to describe such mechanisms.
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Zhong S, Zhou Z, Zhao F, Mao G, Deng GJ, Huang H. Deoxygenative C–S Bond Coupling with Sulfinates via Nickel/Photoredox Dual Catalysis. Org Lett 2022; 24:1865-1870. [DOI: 10.1021/acs.orglett.2c00478] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Shuai Zhong
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan Xiangtan 411105, China
| | - Zhiwei Zhou
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan Xiangtan 411105, China
| | - Feng Zhao
- Hunan Provincial Key Laboratory for Synthetic Biology of Traditional Chinese Medicine, School of Pharmaceutical Sciences, Hunan University of Medicine, Huaihua 418000, China
| | - Guojiang Mao
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
| | - Guo-Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan Xiangtan 411105, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
| | - Huawen Huang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Hunan Xiangtan 411105, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
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7
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Ji X, Yang Z, Wu X, Deng GJ, Huang H. Photoredox Neutral Decarboxylative Hydroxyalkylations of Heteroarenes with α-Keto Acids. J Org Chem 2022; 87:4168-4182. [PMID: 35212524 DOI: 10.1021/acs.joc.1c03007] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photoredox neutral decarboxylative hydroxyalkylations of heteroarenes with α-keto acids under mild conditions are described. Stable and readily available α-keto acids were employed as hydroxyalkylating reagents with only CO2 released as the byproduct. A range of aromatic and aliphatic α-keto acids were successfully converted into hydroxyalkylated products with various heteroarenes. This transformation proceeded through a decarboxylation/Minisci addition/SCS sequence, generating a variety of valuable hydroxyalkylated heteroarenes.
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Affiliation(s)
- Xiaochen Ji
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.,School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
| | - Zhonglin Yang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Xinzhuang Wu
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China
| | - Guo-Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.,School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
| | - Huawen Huang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China.,School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
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8
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Cao H, Ma S, Feng Y, Guo Y, Jiao P. Synthesis of β-nitro ketones from geminal bromonitroalkanes and silyl enol ethers by visible light photoredox catalysis. Chem Commun (Camb) 2022; 58:1780-1783. [PMID: 35037921 DOI: 10.1039/d1cc06529g] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Various β-nitro ketones, including those bearing a β-tertiary carbon, were prepared from geminal bromonitroalkanes and trimethylsilyl enol ethers of a broad range of ketones by visible light photoredox catalysis, which were then easily converted into β-amino ketones, 1,3-amino alcohols, α,β-unsaturated ketones, β-cyano ketones and γ-nitro ketones.
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Affiliation(s)
- Haoying Cao
- College of Chemistry, Beijing Normal University, P. R. China.
| | - Shanshan Ma
- College of Chemistry, Beijing Normal University, P. R. China.
| | - Yanhong Feng
- College of Chemistry, Beijing Normal University, P. R. China.
| | - Yawen Guo
- College of Chemistry, Beijing Normal University, P. R. China.
| | - Peng Jiao
- College of Chemistry, Beijing Normal University, P. R. China.
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Wu X, Zhao F, Ji X, Huang H. Visible Light-Assisted Photocatalyst-Free Tandem Sulfonylation/ Cyclization for the Synthesis of Oxindoles. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202208036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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