Copper(I)-Catalyzed Deacetylenative Coupling of Propargylic Amines: An Efficient Synthesis of Symmetric 1,4-Diamino-2-butynes

Copper(I)-Catalyzed Deacetylenative Coupling of Propargylic Amines: An Efficient Synthesis of Symmetric 1,4-Diamino-2-butynes