反应详情

One gram of 3-(3-trifluoromethylphenyl)-4-amino-5-isothiazolecarboxylic acid and 0.7 g. of carbonyldiimidazole were dissolved in 25 ml. of DMF at ambient temperature. The solution was stirred for 2.25 hours; 3 ml. of 14 N aqueous ammonium hydroxide were added and the resulting mixture stirred overnight at ambient temperature after which time it was poured into an ice-water mixture. 3-(3-Trifluoromethylphenyl)-4-amino-5-isothiazolecarboxamide formed in the above reaction precipitated and the precipitate was collected by filtration and was dried. 3-(3-Trifluoromethylphenyl)-4-amino-5-isothiazole carboxamide, thus prepared and purified, melted at about 124° C. after recrystallization from an ethyl acetate-hexane solvent mixture; yield 0.4 g.

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