p-Toluenesulfonic acid → 5-{1-[4-Hydroxy-1-methyl-5-(4-trifluoromethylphenyl)-1H-pyrazol-3-yl]ethylidenehydrazinocarbonyl}thiophene-2-carboxylic Acid Diethylamide

Participants

Reaction Steps

1-[4-Hydroxy-1-methyl-5-(4-trifluoromethylphenyl)-1H-pyrazol-3-yl]ethanone (28 mg, 0.10 mmol, synthesized in accordance with WO2004/108683), 5-hydrazinocarbonylthiophene-2-carboxylic acid diethylamide (24 mg, 0.10 mmol) prepared in Reference Synthetic Example 1 and p-toluenesulfonic acid (6 mg) were heated with 2-propanol (4 mL) for 14 hours with reflux. After cooling, the solvent was evaporated, and the resulting solid was recrystallized from 2-propanol-diethyl ether-n-hexane to give 27 mg of the desired product (yield 53%).

Provenance & Evidence