Copper-catalyzed regio- and stereoselective fluorocarboalkynylation of alkynes

Abstract

It is attractive to establish an efficient and practical platform affording functional compounds using readily available feedstocks as starting materials under mild conditions. We describe a direct copper-catalyzed fluorocarboalkynylation of the readily available alkynes with excellent regio- and stereoselectivity. A wide range of conjugated trifluoromethyl 1,3-enynes were obtained in good yields by this operationally simple strategy. The mechanistic experiments and DFT calculation revealed that a radical-mediated process was involved in the catalytic cycle.