Ethyl Acetate → 5-Amino-1-(1-naphthyl)-3-(4-tolyl)pyrazole-4-carboxamide

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The title compound was prepared from 2-cyano-3-methylthio-3-(4-tolyl) acrylamide (464 mg, 2.0 mmol), 1-naphthyl hydrazine hydrochloride (389 mg, 2.0 mmol) and sodium hydroxide (88 mg, 2.2 mmol) following the procedure used for the compound of Example 12. The crude product was subjected to column chromatography (SiO2, 50-60% ethyl acetate in hexane) and was recrystallised from diethylether to give the title compound as pink crystals (185 mg) m.p. 195°. δH (CDCl3) 8.00 (1H, d, J 8.3 Hz), 7.95 (1 H., m), 7.73-7.55 (7H, m), 7.30 (2H, d, J 8.3 Hz), 5.52 (2H, br s), 5.16 (2H, br s) and 2.42 (3H, s).

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