The synthesis of enynes from the coupling of terminal alkynes
with alkenyl iodides and bromides is described. This system employs
1.0-5.0 mol% of CuI(Xantphos) as a catalyst. A
variety of alkenyl iodides and bromides are coupled smoothly with terminal
alkynes, affording enynes in good to excellent yields.
copper - cross-coupling - terminal alkyne - alkenyl halide - enyne