反应详情

To a solution of methyl 2-chloro-6-[methyl(methylsulfonyl)amino]isonicotinate (90.2 g, 323.6 mmol) in 1:1 THF:MeOH (1 L) was added a NaOH (388 mL, 388 mmol, 1N). The reaction mixture was stirred at rt for 2 h, acidified to pH 3-4 with 1N HCl, extracted with dichloromethane (×2), dried over sodium sulfate and concentrated in vacuo to provide 2-chloro-6-[methyl(methylsulfonyl)amino]isonicotinic acid (intermediate 4.2c.1) as a white solid. 1H NMR (400 MHz, CD3OD) δ 7.88 (s, 1H), 7.63 (s, 1H), 3.39 (s, 3H), 3.13 (s, 3H).

1. extractionextracted with dichloromethane (×2)
2. dry with materialdried over sodium sulfate
3. concentrationconcentrated in vacuo