1,3-Dienyl and 1,4-dienyl sulfones can be stereoselectively synthesized in one pot under mild conditions, in good yields, by the palladium-catalyzed hydrostannylation of acetylenic sulfones, followed by Stille coupling with alkenyl or allylic halides, respectively.
acetylenic sulfone - hydrostannylation - Stille coupling - 1,3-dienyl sulfone - 1,4-dienyl sulfone