Vinylogous Propargylation of α,α-dicyanoalkenes Construction of an All-carbon Quaternary Center

The first highly efficient vinylogous propargylation of α,α-dicyanoalkenes catalyzed by a copper catalyst to construct of an all-carbon quaternary center with 3-ethynyl-2-oxoindolin-3-yl acetates is reported. The corresponding products with an...