Acetic Acid → 4-(2,4-Dichlorophenyl)-N-(2,4-difluorophenyl)-1,3-dimethyl-1H-pyrazol-5-amine

Participants

Reaction Steps

Acetic acid (50 μL) and methylhydrazine (41 μL) were added to a stirred suspension of α-acetyl-2,4-dichloro-N-(2,4-difluorophenyl)benzeneethanethioamide (238 mg, 0.64 mmol) in ethanol (4 mL). The reaction mixture was heated at reflux for 2 h and allowed to cool. Then the reaction mixture was diluted with ethyl acetate (10 mL) and washed with 1 N aqueous NaOH (10 mL), water (10 mL) and brine (10 mL), dried over MgSO4, and concentrated to leave a solid residue. The residue was purified by column chromatography on 5 g of silica gel with a gradient of hexanes/ethyl acetate (2:1 to 1:1) to give the title compound as a solid (170 mg).

Provenance & Evidence