Zinc‐Catalysed Hydroboration of Terminal and Internal Alkynes

A regioselective hydroboration of alkynes has been developed by using commercially available zinc triflate as a catalyst, in the presence of catalytic amount of NaBHEt3. The reaction tolerates a wide range of terminal alkynes having several synthetically useful functional groups and proceeds regioselectively to furnish hydroborated products in moderate to excellent yields. This system shows moderate chemoselectivity towards terminal C≡C bond over terminal and internal C=C bond and internal C≡C bond. Bore into alkynes! A zinc‐catalysed regioselective hydroboration of alkynes has been achieved. This method shows an excellent substrate scope and moderate chemoselectivity towards terminal alkyne over other reducible functional groups.