5-Aryl-1-[pyrimidin-2(4)-yl]-3-phenyl-4,5-dihydro-1H-pyrazoles. Synthesis from substituted 2(4)-hydrazinopyrimidines and fragmentation under positive electrospray ionization

Abstract

Reaction of substituted 2(4)-hydrazinopyrimidines with 3-aryl-1-phenyl-2-propen-1-ones in the presence of a base results prevailingly in 5-aryl-1-[pyrimidin-2(4)-yl]-3-phenyl-4,5-dihydro-1H-pyrazoles. The fragmentation path of these compounds under positive electrospray ionization consists in simultaneous decomposition of their heterocyclic fragments.