Dimethylformamide → 5-Amino-N-{2-[({[2-chloro-6-(trifluoromethyl)phenyl]carbonyl}amino)methyl]-3,3,3-trifluoro-2-hydroxypropyl}-1-(4-fluorophenyl)-1H-pyrazole-4-carboxamide

Participants

Reaction Steps

To a solution of 2-chloro-6-(trifluoromethyl)benzoic acid (27 mg) in anhydrous tetrahydrofuran (1 ml) was added anhydrous dimethylformamide (5 μl) followed by a solution of oxalyl chloride in anhydrous tetrahydrofuran (1M, 0.13 ml). The solution effervesced and was stirred under nitrogen for 30 minutes. A solution of 5-amino-N-[2-(aminomethyl)-3,3,3-trifluoro-2-hydroxypropyl]-1-(4-fluorophenyl)-1H-pyrazole-4-carboxamide (36 mg) in anhydrous tetrahydrofuran (1 ml) and diisopropylethylamine (65 μl) was added washed in with further tetrahydrofuran (0.5 ml). It was stirred under nitrogen for 16 hours, blown down, dissolved in dichloromethane (5 ml), washed with 2M hydrochloric acid (2 ml), blown down and purified on a silica SPE cartridge (5 g). Elution with dichloromethane followed by ethyl acetate:cyclohexane (1:5), (1:3), (1:2), (1:1) (4 times). Combination of the appropriate fractions and evaporation gave the title compound (50 mg).

Provenance & Evidence