Three-Component Reaction between Triphenylphosphine, Dialkyl Acetylenedicarboxylates and N-Acetylarylidenehydrazides

Abstract

N-acetylarylidenehydrazides undergo a complex addition and cyclisation reaction with dialkyl acetylenedicarboxylates and triphenylphosphine to produce alkyl [2-acetyl-5-(aryl)-3-oxo-2,3-dihydro-1H-pyrazol-4-yl]-(triphenyl-λ 5 -phosphanylidene) acetates in good yields.