ORGANIC SYNTHESIS USING HALOBORATION REACTIONS 11. A FORMAL CARBOBORATION REACTION OF 1-ALKYNES AND ITS APPLICATION TO THE DI- AND TRISUBSTITUTED ALKENE SYNTHESIS
The cross-coupling reaction of organozinc chlorides with (Z)-2-bromo-1-alkenylboranes prepared by the bromoboration reaction of 1-alkynes with tribromoborane, proceeds in the presence of a palladium catalyst to give 2,2-disubstituted alkenylboranes, which can be used for the di- or trisubstituted alkene synthesis directly.