Hydrochloric Acid → methyl 1-(3-chloropyridin-2-yl)-3-{[4-(trifluoromethyl)phenyl]carbamoyl}-1H-pyrazole-5-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of 1.00 g (3.55 mmol) of 1-(3-chloropyridin-2-yl)-5-(methoxycarbonyl)-1H-pyrazole-3-carboxylic acid in 13 ml of dichloromethane and 1.3 ml of N,N-dimethylformamide was cooled to 0° C., a solution of 0.86 g (5.33 mmol) of 4-(trifluoromethyl)aniline in 3 ml of dichloromethane was added dropwise and 0.68 g (3.55 mmol) of N-ethyl-N′-3-(dimethylaminopropyl)carbodiimide×HCl and 87 mg (710 μmol) of 4-dimethylaminopyridine were added a little at a time. The mixture was stirred at 0° C. for 2 hours and at 20° C. for 16 hours. The mixture was then diluted with dichloromethane and washed successively with 1 N aqueous hydrochloric acid and water. The organic phase was dried over sodium sulphate, the solvent was removed under reduced pressure and the residue was purified on silica gel using cyclohexane/ethyl acetate=3:1→2:1. (logP: 3.54).

Provenance & Evidence