Trisubstituted alkenes from alkynes and aryl iodides by boron-to-zinc transmetallation and palladium(0) catalyzed cross coupling

Article abstract of DOI:10.1016/0022-328X(93)83047-Y

Alkenylethylzincs, obtained from the corresponding trialkenylboranes by transmetallation with diethylzine, couple with aryl iodides in the presence of Pd(PPh3)4, 0.19-0.28 molpercent, to produce trisubstituted alkenes in good isolated yields.Both the transmetallation and subsequent coupling occur with complete retention of stereochemistry.