Multi-substituted trifluoromethyl alkene construction via gold-catalyzed fluoroarylation of gem-difluoroallenes

A visible-light-promoted gold-catalyzed fluoroarylation of gem -difluoroallenes is developed. This reaction proceeds in a highly stereo- and regioselective manner and enables a facile construction of tri- and tetra-substituted trifluoromethyl alkenes.