Stannylated Allylsulfones as Versatile New Building Blocks

Propargylic sulfones undergo regioselective hydrostannation in the presence of Mo(CO)3(CNt-Bu)3(MoBl3), giving rise to stannylated allyl sulfones. These are interesting building blocks, because in the first step the vinylstannane subunit can be modified via Stille coupling, and in the second step the sulfone can be subjected to a Julia-Lythgoe olefination. In principle, modifications at the double bond should also be possible after the Stille coupling.