1
|
Chen X, Zhao Y, Huang C, Zhao Z, Zhao W, Li SW. Catalytic asymmetric conjugate addition of coumarins to unsaturated ketones catalyzed by a chiral-at-metal Rh(III) complex. Chem Commun (Camb) 2023; 60:236-239. [PMID: 38054345 DOI: 10.1039/d3cc04726a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
The first catalytic asymmetric vinylogous Michael addition of coumarins to unsaturated ketones catalyzed by chiral rhodium catalysts has been established. This strategy allowed the synthesis of a variety of highly enantioenriched compounds containing coumarin skeletons in 41-99% yields and 84-99% ee. The developed reaction enriches the chemistry of catalytic asymmetric vinylogous Michael additions of 3-cyano-4-methylcoumarins. Furthermore, the protocol showed obvious advantages in reaction enantioselectivity. When the chiral rhodium catalyst was reduced to 0.06 mol%, a Gram-level reaction was still achieved to provide the desired products with 99% ee.
Collapse
Affiliation(s)
- Xiangjie Chen
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Xinjiang Uygur Autonomous Region 832000, People's Republic of China.
| | - Yujie Zhao
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Xinjiang Uygur Autonomous Region 832000, People's Republic of China.
| | - Cheng Huang
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Xinjiang Uygur Autonomous Region 832000, People's Republic of China.
| | - Zhifei Zhao
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Xinjiang Uygur Autonomous Region 832000, People's Republic of China.
| | - Weiwei Zhao
- College of Life Science & Technology, Tarim University, Alar, 843300, Xinjiang, People's Republic of China.
| | - Shi-Wu Li
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Xinjiang Uygur Autonomous Region 832000, People's Republic of China.
| |
Collapse
|
2
|
Qin X, Zhang J, Wang ZY, Song Y, Yang Y, Zhang W, Liu H. Highly regioselective synthesis of lactams via cascade reaction of α,β-unsaturated ketones, ketoamides, and DBU as a catalyst. RSC Adv 2023; 13:4782-4786. [PMID: 36760281 PMCID: PMC9901288 DOI: 10.1039/d2ra07117g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 12/27/2022] [Indexed: 02/08/2023] Open
Abstract
Herein, the aldol/Michael cascade reaction on the β,γ-positions of α,β-unsaturated ketones with ketoamides to construct bicyclic lactams via DBU catalysis has been developed. The substrates were well-tolerated with high regio- and diastereoselectivities in moderate to good yields (32 examples). The control experiments revealed that the hydrogen of the amide was the key factor.
Collapse
Affiliation(s)
- Xin Qin
- College of Chemistry and Materials Engineering, Wenzhou University Wenzhou 325035 P. R. China .,Institute of New Materials & Industrial Technology, Wenzhou University Wenzhou 325035 P. R. China
| | - Jinhai Zhang
- College of Chemistry and Materials Engineering, Wenzhou University Wenzhou 325035 P. R. China .,Institute of New Materials & Industrial Technology, Wenzhou University Wenzhou 325035 P. R. China
| | - Zhan-Yong Wang
- School of Pharmacy, Xinxiang UniversityXinxiang453003P. R. China
| | - Yimei Song
- College of Chemistry and Materials Engineering, Wenzhou University Wenzhou 325035 P. R. China .,Institute of New Materials & Industrial Technology, Wenzhou University Wenzhou 325035 P. R. China
| | - Yixiao Yang
- College of Chemistry and Materials Engineering, Wenzhou University Wenzhou 325035 P. R. China .,Institute of New Materials & Industrial Technology, Wenzhou University Wenzhou 325035 P. R. China
| | - Wenhai Zhang
- College of Chemistry and Materials Engineering, Wenzhou University Wenzhou 325035 P. R. China .,Institute of New Materials & Industrial Technology, Wenzhou University Wenzhou 325035 P. R. China
| | - Hongxin Liu
- College of Chemistry and Materials Engineering, Wenzhou University Wenzhou 325035 P. R. China .,Institute of New Materials & Industrial Technology, Wenzhou University Wenzhou 325035 P. R. China
| |
Collapse
|
3
|
Chen X, An Y, Du G, Zhao Y, He L, Zhao J, Li SW. Catalytic Asymmetric Conjugate Addition of 2-Methyl-3,5-dinitrobenzoates to Unsaturated Ketones. J Org Chem 2022; 87:5497-5509. [PMID: 35420811 DOI: 10.1021/acs.joc.1c02757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Asymmetric catalytic vinylogous Michael addition of 2-methyl-3,5-dinitrobenzoates to unsaturated ketones catalyzed by chiral rhodium catalysts has been established. This strategy allowed the synthesis of a variety of optically pure compounds containing imidazole and 3,5-dinitrobenzene skeletons in 64-98% yields with 88-98% ee. The developed reaction not only represents highly asymmetric catalytic enantioselective vinylogous Michael addition employing 2-methyl-3,5-dinitrobenzoates as a building block but also enriches the chemistry of catalytic asymmetric vinylogous Michael addition of 2-methyl-3,5-dinitrobenzoates. Furthermore, the protocol showed obvious advantages in reaction activity and enantioselectivity. When the chiral rhodium catalyst was reduced to 0.06 mol %, the gram-level reaction was still achieved to provide the desired product with 95% ee.
Collapse
Affiliation(s)
- Xiangjie Chen
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, People's Republic of China
| | - Yi An
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, People's Republic of China
| | - Guangfen Du
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, People's Republic of China
| | - Yujie Zhao
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, People's Republic of China
| | - Lin He
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, People's Republic of China
| | - Jixing Zhao
- Analysis and Testing Center of Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, People's Republic of China
| | - Shi-Wu Li
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, People's Republic of China
| |
Collapse
|