Ammonia → 5-(4-Chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-Pyrazole-3-carboxamide

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Reaction Steps

Thionyl chloride (1.3 ml, 22.0 mmol) was added to a solution of 5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxylic acid (2.09 g, 5.5 mmol) in toluene (50 ml) maintained at room temperature. The mixture was refluxed at 110° C. for 2 hours and then cooled to room temperature. The resulting solution was evaporated and dried under a vacuum to produce crude 5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carbonyl chloride, which are not further purified. 27% aqueous ammonia (2 ml) was added to the solution of crude 5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carbonyl chloride in methylene chloride (10 ml) at 0° C. After stirring 3 hours at room temperature, the resulting solution was quenched with saturated ammonium chloride which was extracted twice with 50 ml portions of ethyl acetate. After concentrating the extract by evaporation, the crude residue was purified using a silica gel column (hexane/ethyl acetate=1/1), to obtain the title compound (2.07 g, 99%) as white solid.

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