A general method for the synthesis of tetrasubstituted alkenyl
sulfides has been developed by the carbocupration of alkynyl
sulfides with functionalized diorganozinc reagents in the presence
of CuCN˙2LiCl. The intermediate alkenylcopper reagents readily
react with various electrophiles furnishing a broad range of highly
functionalized alkenes with excellent stereoselectivity (E/Z 93:7-99:1).
alkynyl sulfides - copper - zinc - carbometalation - olefins