Palladacycle-Catalyzed Olefinic C–P Cross-Coupling of Alkenylsulfonium Salts with Diarylphosphines to Access Alkenylphosphines

An efficient olefinic C–P cross-coupling of alkenylsulfonium salts with secondary diarylphosphines is reported. The use of a palladacycle enables the facile formation of a C–P bond at the alkenyl moiety of alkenylsulfonium salts tolerating a wide range of functional groups under mild conditions. This protocol provides an easy access to various alkenylphosphine products in good to high yields with high levels of stereoselectivity (E selectivity).