CONDENSED HETEROAROMATIC RING SYSTEMS. VII. SYNTHESIS OF THIENOPYRIDINES, THIENOPYRIMIDINES, AND FUROPYRIDINES FROM o-SUBSTITUTED N-HETEROARYLACETYLENES
The cross-coupling reaction of 2-chloro-3-iodo- and 4-chloro-3iodopyridines with phenylacetylene in the presence of dichlorobis(triphenylphosphine)palladium occured at the 3-position.The 3-ethynylpyridines containing an adjacent chloro group were converti