Highly Enantioselective Chiral Diol-Catalyzed Conjugate Addition of Boronic Acids to α,β-Unsaturated Trifluoromethyl Ketones.

The ( R )-3,3'-(3,5-(CF 3 ) 2 -C 6 H 3 ) 2 -BINOL-catalyzed enantioselective conjugate addition of organic boronic acids to α,β-unsaturated 1,1,1-trifluoromethyl ketones affords corresponding addition products bearing a stereogenic center at the β-position in moderate to high yields and excellent enantioselectivities (up to 99% ee), without any 1,2-addition product formation. Moreover, this catalytic protocol features mild reaction conditions, a broad substrate scope, suitability for alkenylboronic acids and (hetero)arylboronic acids, and easy scale-up.