Amide-controlled highly selective catalytic borylcupration of allenes.

A novel copper-catalyzed, highly regio- and stereoselective borylcupration of substituted 2,3-allenamides with bis(pinacolato)diboron producing Z-β-borylated β,γ-unsaturated enoamides has been demonstrated. Due to the unique effect of the amide-group, perfect regio- and stereoselectivity and good to excellent yields have been achieved, which were rationalized by a DFT study.