2-Chloronicotinic acid → 2-Chloro-N-methoxy-N-methylnicotinamide

Participants

Reaction Conditions

Reaction Steps

A solution of 2-chloronicotinic acid (20.0 g, 127 mmol) in N,N-dimethylformamide (600 mL, 0.21M) was treated with N,N-diisopropylethylamine (66 mL, 379 mmol), N,O-dimethylhydroxylamine hydrochloride (13.63 g, 140 mmol), and benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphonium hexafluorophosphate (84.25 g, 190 mmol). The reaction was stirred at 25° C. over 3 d. The resulting reaction was concentrated in vacuo, taken up in ethyl acetate (400 mL) and washed with a saturated aqueous ammonium chloride solution (2×250 mL), a saturated aqueous sodium bicarbonate solution (2×250 mL), and a saturated aqueous sodium chloride solution (250 mL). The organics were dried over magnesium sulfate, filtered and rinsed with ethyl acetate, and concentrated in vacuo. Flash chromatography (AnaLogix IntelliFlash 280 column chromatography, 400 g silica gel column, 25-50% ethyl acetate/hexanes) afforded 2-chloro-N-methoxy-N-methyl-nicotinamide (23.58 g, 93%) as a light yellow oil.

Provenance & Evidence