Copper-catalyzed dehydrogenative borylation of terminal alkynes with pinacolborane

LCuOTf complexes [L = cyclic (alkyl)(amino) carbenes (CAACs) or N-heterocyclic carbenes (NHCs)] selectively promote the dehydrogenative borylation of C(sp)-H bonds at room temperature. It is shown that s, p-bis(copper) acetylide and copper hydride complexes are the key catalytic species.