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Novel sulfonamide derivatives have been synthesized from the readily accessible N‐(4‐acetylphenyl)benzenesulfonamide (1). Condensation of 1 with phenylhydrazine in refluxing ethyl alcohol gave the corresponding phenylhydrazone 2, which was then added to the Vilsmeier‐Haack reagent (POCl3/DMF) to give the 4‐formylpyrazole derivative 3. Fusion of 1 with thiourea in the presence of iodine at 130°C afforded...
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