Volume 129, Issue 10 pp. 2769-2773
Zuschrift

One-Pot N-Deprotection and Catalytic Intramolecular Asymmetric Reductive Amination for the Synthesis of Tetrahydroisoquinolines

Huan Zhou

Huan Zhou

Department of Chemistry and Chemical Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi, 712100 PR China

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Yuan Liu

Yuan Liu

Department of Chemistry and Chemical Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi, 712100 PR China

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Suhua Yang

Suhua Yang

Department of Chemistry and Chemical Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi, 712100 PR China

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Prof. Dr. Le Zhou

Prof. Dr. Le Zhou

Department of Chemistry and Chemical Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi, 712100 PR China

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Prof. Dr. Mingxin Chang

Corresponding Author

Prof. Dr. Mingxin Chang

Department of Chemistry and Chemical Engineering, Northwest A&F University, 22 Xinong Road, Yangling, Shaanxi, 712100 PR China

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First published: 01 February 2017
Citations: 12

Abstract

A one-pot N-Boc deprotection and catalytic intramolecular reductive amination protocol for the preparation of enantiomerically pure tetrahydroisoquinoline alkaloids is described. The iodine-bridged dimeric iridium complexes displayed superb stereoselectivity to give tetrahydroisoquinolines, including several key pharmaceutical drug intermediates, in excellent yields under mild reaction conditions. Three additives played important roles in this reaction: Titanium(IV) isopropoxide and molecular iodine accelerated the transformation of the intermediate imine to the tetrahydroisoquinoline product; p-toluenesulfonic acid contributed to the stereocontrol.

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