Ethenylation and Alkynylation in Palladium-Catalyzed Carbosubstitution in Heteroazines.
摘要:
Hydrozirconated alkynes can be used for regioselective E-alkenylation of 2,4-dichloro-pyrimidine or -quinazoline with Pd-catalysis. Partial saturation of an alkynylpyrimidine by catalytic hydrogenation gave the corresponding Z-alkenyl derivative. Alkynyl derivatives have been prepared by carbosubstitution in regio- and chemo-selective reactions.