Treatment of 3-methyl 1-phenyl-5-amino pyrazole 1 with 4-acetyl benzene sulfonyl chloride in pyridine gave the sulfonamide 2. Condensation of 2 with aromatic aldehydes, semicarbazide, and thiosemicarbazide furnished the f, g-unsaturated ketones 3a-c, the semicarbazone 4a and the thiosemicarbazone 4b respectively. Reaction of 3a-c with hydrazine hydrate, phenyl hydrazine, hydroxylamine, thiourea afforded the pyrazoles 5a-f, ...
