Stereo- and Regio-Selective Synthesis of Silicon-Containing Diborylalkenes via Platinum-Catalyzed Mono-Lateral Diboration of Dialkynylsilanes

A highly chemoselective platinum-catalyzed mono-lateral diboration of dialkynylsilanes for the construction of silicon-tethered alkynyl diborylalkenes is described, in which the tris(4-methoxyphenyl)phosphine was found to be an effective ligand for cis-addition of diboron agent to the silicon-tethered alkynes, and the chiral ligand (AFSi-Phos) -mediated diboration of dialkynylsilanes resulted into desymmetric construction of silicon-stereogenic center in promising enantioselectivity.