Lithium hydroxide, monohydrate → 2-(2-Nitro-5-(piperidin-1-yl)phenyl)isonicotinic acid

Into a 50-mL round-bottom flask, was placed a solution of methyl 2-(2-nitro-5-(piperidin-1-yl)phenyl)isonicotinate 1.1 g (1 g, 2.93 mmol, 1.00 equiv) in tetrahydrofuran/water (1:1) (20 mL), lithium hydroxide hydrate (1.26 g, 30.00 mmol, 10.23 equiv). The resulting solution was stirred overnight at 25° C. in an oil bath. The resulting mixture was concentrated under vacuum. The resulting solution was diluted with 10 mL of water. The resulting solution was extracted with 2×20 mL of ethyl acetate and the aqueous layers combined. The solution was adjusted to pH 5 with hydrochloric acid. The resulting solution was extracted with 2×50 mL of ethyl acetate and the organic layers combined, dried over anhydrous sodium sulfate, and concentrated under vacuum. This resulted in 0.8 g (83%) of 2-(2-nitro-5-(piperidin-1-yl)phenyl)isonicotinic acid as a yellow solid.