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Isoda K, Sato Y. Cobalt(I)-Catalyzed Reductive Cyclization of Enynes and Diynes Using Hydrogen Gas as a Reductant. Org Lett 2023; 25:2103-2107. [PMID: 36943924 DOI: 10.1021/acs.orglett.3c00524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Reductive cyclization of enynes and diynes by using H2 gas as a reductant was realized, and the corresponding cyclized products were obtained in good yields without olefin isomerization and over-reduction of the products. By an experiment using D2 instead of H2, it was confirmed that H2 unambiguously operates as a reductant in this reaction. The protocol of the reaction is very economical and user-friendly, using air- and moisture-stable CoBr2·6H2O and 1 atm of pressure of H2.
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Affiliation(s)
- Kaho Isoda
- Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
| | - Yoshihiro Sato
- Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan
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2
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Hou SH, Yu X, Zhang R, Wagner C, Dong G. Rhodium-Catalyzed Diastereo- and Enantioselective Divergent Annulations between Cyclobutanones and 1,5-Enynes: Rapid Construction of Complex C(sp 3)-Rich Scaffolds. J Am Chem Soc 2022; 144:22159-22169. [PMID: 36399332 PMCID: PMC10630065 DOI: 10.1021/jacs.2c09814] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Given the emerging demand to "escape from flatland" for drug discovery, synthetic methods that can efficiently construct complex three-dimensional structures with multi-stereocenters become increasingly valuable. Here, we describe the development of Rh(I)-catalyzed intramolecular annulations between cyclobutanones and 1,5-enyne groups to construct complex C(sp3)-rich scaffolds. Divergent reactivities are realized with different catalysts, and excellent diastereo- and enantioselectivity have been achieved. The use of (R)-H8-binap as the ligand favors forming the bis-bicyclic scaffolds with multiple quaternary stereocenters, while the (R)-segphos ligand prefers to generate the tetrahydro-azapinone products. Owing to the versatile reactivity of ketone moieties, these C(sp3)-rich scaffolds can be further functionalized. Experimental and computational mechanistic studies support a reaction pathway involving enyne-cyclometallation, 1,2-carbonyl addition, and then β-carbon elimination; the divergent reactivities are dictated by a product-determining Rh-alkyl migratory insertion step.
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Affiliation(s)
- Si-Hua Hou
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Xuan Yu
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Rui Zhang
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Cole Wagner
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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Oonishi Y, Sato Y, Sakamoto S, Agata S. Rhodium(I)-Catalyzed Enantioselective Cyclization of Enynes through Site-Selective C(sp3)–H Bond Activation Triggered by Formation of Rhodacycle. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1469-7408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractRhodium(I)-catalyzed enantioselective cyclization of enynes through C(sp3)–H bond activation was investigated. It was found that the cyclization of enynes having a tert-butyl moiety on the alkene afforded a spirocyclic compound (up to 92% ee), while the cyclization of enynes having an isopropyl or an ethyl group on the alkene gave a cyclic diene (up to 98% ee). Furthermore, an intermolecular competition reaction using a deuterium-labeled substrate revealed that C(sp3)–H bond activation was one of the key steps, having a high energy barrier, in this cyclization.
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4
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Chen J, Wang Y, Ding Z, Kong W. Synthesis of bridged tricyclo[5.2.1.0 1,5]decanes via nickel-catalyzed asymmetric domino cyclization of enynones. Nat Commun 2020; 11:1882. [PMID: 32312990 PMCID: PMC7171102 DOI: 10.1038/s41467-020-15837-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 03/30/2020] [Indexed: 12/18/2022] Open
Abstract
The restricted availability, expense and toxicity of precious metal catalysts such as rhodium and palladium challenge the sustainability of synthetic chemistry. As such, nickel catalysts have garnered increasing attention as replacements for enyne cyclization reactions. On the other hand, bridged tricyclo[5.2.1.01,5]decanes are found as core structures in many biologically active natural products; however, the synthesis of such frameworks with high functionalities from readily available precursors remains a significant challenge. Herein, we report a nickel-catalyzed asymmetric domino cyclization reaction of enynones, providing rapid and modular synthesis of bridged tricyclo[5.2.1.01,5]decane skeletons with three quaternary stereocenters in good yields and remarkable high levels of regio- and enantioselectivities (92-99% ee).
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Affiliation(s)
- Jiachang Chen
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China
| | - Yiming Wang
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China
| | - Zhengtian Ding
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China
| | - Wangqing Kong
- The Center for Precision Synthesis (CPS), Institute for Advanced Studies (IAS), Wuhan University, 430072, Wuhan, People's Republic of China.
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Suzuki S, Shibata Y, Tanaka K. Rhodium-Catalyzed Asymmetric [2+2+2] Cycloaddition of 1,6-Enynes with Racemic Secondary Allylic Alcohols through Kinetic Resolution. Chemistry 2020; 26:3698-3702. [PMID: 31903635 DOI: 10.1002/chem.202000010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Indexed: 01/01/2023]
Abstract
It has been established that a cationic rhodium(I)/P-phos complex catalyzes the asymmetric [2+2+2] cycloaddition of 1,6-enynes with racemic secondary allylic alcohols to produce the corresponding chiral bicyclic cyclohexenes, possessing three stereogenic centers, as a single diastereomer with excellent ee values. Mechanistic experiments revealed that the present cycloaddition proceeds through the kinetic resolution of the racemic secondary allylic alcohols, in which one enantiomer preferentially reacts with the 1,6-enyne.
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Affiliation(s)
- Shunsuke Suzuki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Yu Shibata
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Ken Tanaka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8550, Japan
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Teng Q, Mao W, Chen D, Wang Z, Tung C, Xu Z. Asymmetric Synthesis of a Fused Tricyclic Hydronaphthofuran Scaffold by Desymmetric [2+2+2] Cycloaddition. Angew Chem Int Ed Engl 2020; 59:2220-2224. [DOI: 10.1002/anie.201911071] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 10/15/2019] [Indexed: 12/18/2022]
Affiliation(s)
- Qi Teng
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Wenxiu Mao
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Dong Chen
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Zhen Wang
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Chen‐Ho Tung
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Zhenghu Xu
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
- State Key Laboratory of Organometallic ChemistryShanghai Institute of Organic ChemistryChinese Academy of Sciences Shanghai 200032 China
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7
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Li SJ, Huang J, He JY, Zhang RJ, Qian HD, Dai XL, Kong HH, Xu H. Highly enantioselective copper-catalyzed propargylic amination to access N-tethered 1,6-enynes. RSC Adv 2020; 10:38478-38483. [PMID: 35685332 PMCID: PMC9127637 DOI: 10.1039/d0ra07698h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 10/12/2020] [Indexed: 12/17/2022] Open
Abstract
A highly enantioselective copper-catalyzed propargylic amination has been developed with a new chiral N,N,P ligand, providing a series of N-tethered 1,6-enynes in good to excellent yields with excellent enantioselectivities.
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Affiliation(s)
- Si-Jia Li
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
| | - Jian Huang
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
| | - Jin-Yu He
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
| | - Rui-Jin Zhang
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
| | - Hao-Dong Qian
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
| | - Xue-Lin Dai
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
| | - Han-Han Kong
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
| | - Hao Xu
- CCNU-uOttawa Joint Research Centre
- Key Laboratory of Pesticides & Chemical Biology Ministry of Education
- International Joint Research Center for Intelligent Biosensing Technology and Health
- College of Chemistry
- Central China Normal University
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8
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Teng Q, Mao W, Chen D, Wang Z, Tung C, Xu Z. Asymmetric Synthesis of a Fused Tricyclic Hydronaphthofuran Scaffold by Desymmetric [2+2+2] Cycloaddition. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201911071] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Qi Teng
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Wenxiu Mao
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Dong Chen
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Zhen Wang
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Chen‐Ho Tung
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
| | - Zhenghu Xu
- Key Lab for Colloid and Interface Chemistry of Education MinistryDepartment of ChemistryShandong University No. 27 South Shanda Road Jinan 250100 China
- State Key Laboratory of Organometallic ChemistryShanghai Institute of Organic ChemistryChinese Academy of Sciences Shanghai 200032 China
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