Direct preparation of Z-1,3-enyne systems with a TMS-propargylic sulfone:: Application of a one-pot Julia olefination

A benzothiazolyl TMS-propargylic sulfone was subjected to one-pot Julia olefinations with a variety of aliphatic and aromatic aldehydes. Predominant Z-selectivity up to 98:2 and good chemical yields were obtained in a facile route to the desired Z-1,3-enyne moieties.