Catalytic asymmetric synthesis of either enantiomer of physostigmine. Formation of quaternary carbon centers with high enantioselection by intramolecular Heck reactions of (Z)-2-butenanilides
作者:Atsuyuki Ashimori、Takaharu Matsuura、Larry E. Overman、Daniel J. Poon
DOI:10.1021/jo00077a005
日期:1993.12
A practical method for preparing either enantiomer of physostigmine and congeners is reported. The Z stereochemistry of the butenanilide cyclization substrate is required to obtain high enantioselection (95% ee) in the key asymmetric Heck insertion.