Copper(I)-Secondary Diamine Complex-Catalyzed Enantioselective Conjugate Boration of Linear β,β-Disubstituted Enones

A copper(I) chiral secondary diamine (L-e) complex catalyzes an enantioselective conjugate boration of beta,beta-disubstituted enones in high yields and up to 99% ee. Product chiral tertiary organoboronates can be converted to enantiomerically enriched cross-aldol products between ketones without any racemization.