Volume 58, Issue 33 pp. 11505-11512
Research Article

Chemo- and Enantioselective Hydrogenation of α-Formyl Enamides: An Efficient Access to Chiral α-Amido Aldehydes

Jian Zhang

Jian Zhang

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

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Jia Jia

Jia Jia

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

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Xincheng Zeng

Xincheng Zeng

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

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Yuanhao Wang

Yuanhao Wang

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

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Dr. Zhenfeng Zhang

Dr. Zhenfeng Zhang

Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, 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 Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240 China

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First published: 12 June 2019
Citations: 66

Graphical Abstract

A new arrow in the quiver: A highly chemo- and enantioselective hydrogenation of α-formyl enamides has been developed for the synthesis of chiral α-amido aldehydes in high yields (98–99 %), with excellent chemo- and enantioselectivities (up to >99.9 % ee), and with high substrate/catalyst ratios (up to 20000 S/C). Computations give a clear description of the R/S pathways of the catalytic cycle.

Abstract

In order to effectively synthesize chiral α-amino aldehydes, which have a wide range of potential applications in organic synthesis and medicinal chemistry, a highly chemo- and enantioselective hydrogenation of α-formyl enamides has been developed, catalyzed by a rhodium complex of a P-stereogenic bisphosphine ligand. Under different hydrogen pressures, the chiral α-amido aldehydes and β-amido alcohols were obtained in high yields (97–99 %) and with excellent chemo- and enantioselectivities (up to >99.9 % ee). The hydrogenation can be carried out on a gram scale and with a high substrate/catalyst ratio (up to 20 000 S/C), and the hydrogenated products were further converted into several important chiral products. Computations of the catalytic cycle gave a clear description for the R/S pathways, provided a reasonable explanation for the enantioselectivity, and revealed several other specific features.

Conflict of interest

The authors declare no conflict of interest.

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