Palladium-Catalyzed Asymmetric Hydrogenation of Unprotected 3-Substituted Indoles

J Org Chem. 2022 Aug 5;87(15):10398-10407. doi: 10.1021/acs.joc.2c00702. Epub 2022 Jul 22.

Abstract

A palladium-catalyzed asymmetric hydrogenation of unprotected 3-substituted indoles was developed, providing a series of 3-substituted indolines in excellent yields with ≤94.4:5.6 er. The large sterically hindered bisphosphine ligand played a crucial role in the enantioselective control. In addition, the gram-scale hydrogenation experiment and product derivatizations were performed successfully.