Hydrochloric Acid → 5-Cyano-2-(difluoromethyl)nicotinic acid

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Reaction Steps

To a solution of ethyl 5-cyano-2-(difluoromethyl)nicotinate (1.2 g, 5.3 mmol) in THF:water (20 mL:5 mL) was added LiOH.H2O (0.267 g, 6.3 mmol) at 0° C. and the reaction mass was stirred for 40-60 minutes. The reaction mass was acidified with dil. HCl and extracted with ethyl acetate. The organic layer was separated, dried over anhydrous sodium sulphate and concentrated to afford 0.700 g of the desired product. 1H NMR (300 MHz, DMSO d6): δ 7.37-7.72 (t, J=53.7 Hz, 1H), 8.24 (s, 1H), 9.30 (s, 1H), 14.25 (br s, 1H); MS (m/z): 199.34 (M+H)+.

Provenance & Evidence