Phosphorus oxychloride → 5-(4-chloro phenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carbonitrile

Participants

Reaction Conditions

Reaction Steps

Added dropwise to a solution of 5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxamide (1.57 g, 4.1 mmol) obtained in Step 1 dissolved in dimethylformamide (10 ml) at 0° C., was phosphoryl chloride (0.72 ml, 8.2 mmol). The resulting mixture was stirred for 20 minutes at 0° C. and then stirred for 1 hour at room temperature. The reaction mixture was quenched with water at 0° C., and an mixture was extracted with ethyl acetate (30 ml twice). After removing the solvent, 5-(4-chloro phenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carbonitrile was obtained by column chromatography as white solid (1.47 g, quantativly).

Provenance & Evidence