Synthesis and Characterization of 4-Aroyl Substituted Pyrazolines and Pyrazoles

Abstract

Some new 4-aroyl substituted pyrazolines (IIIa-d) and pyrazole
(lVa-d) have been synthesized by condensation of phenyl hydrazine
hydrochloride with 3-aroyl flavanones (1a-d) and 3-aroyl flavones
(IIa-d) respectively in DMF containing small amount of piperidine.
Also, 4-aroyl substituted pyrazoles (IVa-d) have been synthesized
by reaction with 4-aroyl substituted pyrazoline (IIIa-d) with
DMSO·I₂-H₂SO₄ system or DMSO·I₂ system. Structures of the
compounds have been characterized by IR spectra, PMR spectra
and chemical properties.