Enantioselective Synthesis of Yohimbine Analogues by an Organocatalytic and Pot-Economic Strategy

J Org Chem. 2019 Sep 20;84(18):12138-12147. doi: 10.1021/acs.joc.9b01193. Epub 2019 Jul 24.

Abstract

An efficient and one-pot method has been developed for the enantioselective synthesis of pentacyclic indole derivatives with the yohimbane skeleton via a sequence of asymmetric Michael-Michael-Mannich-reduction-amidation-Bischler-Napieralski-reduction reactions with a high diastereoselectivity and high enantioselectivities (up to >99% ee). The seven-step reaction sequence, which generates five bonds and five stereocenters, can be conducted with a pot-economic synthetic strategy and one-pot operation in good yields. The structure and absolute stereochemistry of two products were confirmed by X-ray crystallography analysis.

Publication types

  • Research Support, Non-U.S. Gov't