Enantioselective 1,2-Addition of alpha-Aminoalkyl Radical to Aldehydes via Visible-Light Photoredox Initiated Chiral Oxazaborolidinium Ion Catalysis

摘要

Enantioselective 1,2-addition reaction of alpha-aminoalkyl radical to alpha,beta-unsaturated or aromatic aldehydes to synthesize highly optically active beta-amino alcohols has been developed. In the presence of chiral oxazaborolidinium ion catalyst and photosensitizer, the reaction provides desired beta-amino allylic or benzylic alcohols with high yields (up to 99%) and high enantioselectivities (up to 98% ee).