Volume 58, Issue 44 pp. 15767-15771
Communication

Cobalt-Catalyzed Asymmetric Hydrogenation of C=N Bonds Enabled by Assisted Coordination and Nonbonding Interactions

Yanhua Hu

Yanhua Hu

Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

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Dr. Zhenfeng Zhang

Dr. Zhenfeng Zhang

School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

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Jian Zhang

Jian Zhang

School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

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Prof. Dr. Yangang Liu

Prof. Dr. Yangang Liu

Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

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Prof. Dr. Ilya D. Gridnev

Prof. Dr. Ilya D. Gridnev

Department of Chemistry, Graduate School of Science, Tohoku University, Aramaki 3–6, Aoba-ku, Sendai, 980-8578 Japan

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Prof. Dr. Wanbin Zhang

Corresponding Author

Prof. Dr. Wanbin Zhang

Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

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First published: 29 August 2019
Citations: 109

Graphical Abstract

Interaction skills: Chiral nitrogen-containing compounds have been synthesized with excellent enantioselectivity (95–98 % ee) and high productivity (up to 2000 TON) by the Co-catalyzed asymmetric hydrogenation of C=N bonds. The reaction is facilitated by coordination of an NHBz group in the substrates to the cobalt atom and a nonbonding interaction with the ligand.

Abstract

An efficient cobalt-catalyzed asymmetric hydrogenation of C=N bonds has been realized. Chiral hydrazines were obtained in high yields and with excellent enantioselectivities (95–98 % ee). The hydrogenation went smoothly at up to 2000 substrate/catalyst and on a gram scale. The success of this reaction relies on the presence of an NHBz group in the substrates, with the reactivity and enantioselectivity improved by an assisted coordination to the cobalt atom and a nonbonding interaction with the ligand. Furthermore, this reaction has practical applications for the synthesis of several useful chiral nitrogen-containing compounds.

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