Copper-Catalyzed Trifluoromethylation of Polysubstituted Alkenes Assisted by Decarboxylation

An efficient copper-catalyzed trifluoromethylation of polysubstituted alkenes assisted by decarboxylation of β,γ-unsaturated carboxylic acids has been achieved. The reaction provides a general method to construct allylic and vinylic CF3-substituted compounds under mild conditions.