Hydrochloric Acid → N-(5-amino-2-chloropyridin-3-yl)morpholine-4-sulfonamide

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The two batches of N-(2-chloro-5-(diphenylmethyleneamino)pyridin-3-yl)morpholine-4-sulfonamide (total 0.47 g, 1.0 mmol) were placed in two 150 mL round-bottomed flasks. To each flask were added 1 N hydrochloric acid (0.6 mL each, total 1.2 mL) and 3 mL THF (3 mL each, total 6 mL). After stirring at room temperature for 10 min, the two reaction mixtures were combined and most of THF was removed in vacuo, and the residue was partitioned between saturated aqueous ammonium chloride (30 mL) and 25% isopropanol in chloroform (30 mL). The aqueous phase was extracted with 25% isopropanol in chloroform (2×20 mL). The combined organic phases were dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by silica gel column chromatography (25 g, eluent: iPrOH in CHCl3 0% to 10%) to afford N-(5-amino-2-chloropyridin-3-yl)morpholine-4-sulfonamide (0.233 g, 77% yield) as a light brown solid. 1H NMR (400 MHz, CDCl3) δ ppm 7.64 (d, J=2.74 Hz, 1H) 7.30 (d, J=2.74 Hz, 1H) 6.68 (br. s., 1H) 3.83 (br. s., 2H) 3.66-3.71 (m, 4H) 3.22-3.27 (m, 4H). m/z (ESI, positive ion): 293.0 (M+H)+.

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