Regioselective Cu(I)-Catalyzed Tandem A3-Coupling/Decarboxylative Coupling to 3-Amino-1,4-Enynes

Abstract
An efficient and novel copper-mediated protocol for the synthesis of 3-amino-1,4-enynes from glyoxylic acid, an amine, and an alkyne was developed. This new reaction involving two sequential C–C bond formations is air and moisture tolerant and proceeds via a tandem A3-coupling and a selective decarboxylative coupling.