Tributylphosphine-Catalyzed Stereoselective O-Vinylation of 2-Hydroxybenzaldehyde Derivatives
摘要:
Protonation of the highly reactive 1:1 intermediates, produced in the reaction between tributylphosphine and alkyl acetylenecarboxylates by 2-hydroxybenzaldehyde derivatives, leads to vinyltributylphosphonium salts, which undergo a Michael addition reaction with conjugate base to produce corresponding phosphorus ylides. The phosphorus ylides convert to electron-poor O-vinyl ether derivatives under reaction conditions.