Methyl 4-(hydrazinecarbonyl)benzoate → HCID 178498000, compound

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1-(1-(3,4-Dimethylphenyl)-5-hydroxy-3-trifluoromethyl-1H-pyrazol-4-yl)-ethanone (0.189 mmol, 56.5 mg) and 4-methoxycarbonylbenzhydrazide (0.189 mmol, 36.8 mg) were stirred in DMF at 100° C. for 2.2 hours and at 120° C. for 17 hours. After the solvent was removed by evaporation, the residue was resolved by silica gel thin layer chromatography (CHCl3/MeOH=10/1) to obtain 4-methoxycarbonylbenzoic N′-(1-(1-(3,4-dimethylphenyl)-3-trifluoromethyl-5-oxo-1,5-dihydropyrazol-4-ylidene)-ethyl)-hydrazide as a yellow solid (55.6 mg, 62%)

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