Aniline → 2-Phenylamino-6-trifluoromethyl-nicotinic acid

Participants

Reaction Conditions

Reaction Steps

A solution of 2-chloro-6-trifluoromethyl-nicotinic acid (5 g, 22.2 mmol) in tetrahydrofuran (20 mL) cooled to −78° C. was treated with lithium bis(trimethylsilyl)amide (1.0 M solution in tetrahydrofuran, 66.5 mL, 66.5 mmol). This solution was stirred at −78° C. for 2 h. At this time, the reaction was treated with a solution of aniline (19.6 g, 19.2 mL, 210 mmol) in tetrahydrofuran (20 mL). The reaction was allowed to gradually warm to 25° C. and was stirred at 25° C. overnight. At this time, the reaction mixture was diluted with ethyl acetate (250 mL), washed with a saturated aqueous sodium bicarbonate solution (2×150 mL), water (1×50 mL), and a saturated aqueous sodium chloride solution (1×50 mL). The organic layers were dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo. The residue was triturated in ether to afford 2-phenylamino-6-trifluoromethyl-nicotinic acid (6.19 g, 96.9%) as a light brown solid.

Provenance & Evidence