Copper-Catalyzed Enantioselective Conjugate Addition of Grignard Reagents to Methyl 4,4,4-Trifluorocrotonate: Synthesis of Enantioenriched Trifluoromethylated Compounds

Copper-catalyzed enantioselective 1,4-conjugate addition of methyl 4,4,4-trifluorocrotonate with aliphatic Grignard reagents to access an asymmetric tertiary carbon center attached with a trifluoromethyl group was achieved under mild reaction conditions. The desired products could be obtained in reasonable yields and good enantioselectivities.