All reactions were performed in an oven-dried glassware under the argon atmosphere. Solvents were dried by distillation over sodium/benzophenone. Alkynes and pinacolborane were used as supplied and degassed prior to use. Alkali metal trialkylborohydrides were commercially available as 1M solutions in toluene or THF and used as received. Gas chromatography was performed on a Bruker Scion 436-GC with a TCD detector. GC-MS analyses were performed on a Bruker Scion 436-GC a Scion SQ-MS mass spectrometry detector. NMR analyses were performed on a Bruker Fourier 300 spectrometer and referenced to the solvent residual peak.