Copper‐Catalyzed Three‐Component Cascade Reaction of Alkynes, Sulfonyl Azides and Simple Aldehydes/Ketones.

A copper-catalyzed dimethylzinc-promoted three-component cascade reaction of alkynes, sulfonyl azides, and simple aldehydes or ketones is described. Polysubstituted olefins were thus constructed expeditiously in a one-pot procedure under mild conditions.