反应详情

A stirred solution of 4-(4-bromo-2-fluorophenylamino)-5-fluoro-6-oxo-1,6-dihydropyridine-3-carboxylic acid methyl ester (0.10 g, 0.278 mmol) in 4:1 THF:MeOH (5 mL) was treated with 1 M LiOH solution (0.75 mL). After 8 hours, the reaction mixture was acidified to pH 1 with 1 N HCl and extracted with ethyl acetate. The combined organic extracts were washed with brine, dried (MgSO4) and concentrated under reduced pressure to give 0.095 g (99%) of desired product as a white solid. MS APCI (−) m/z 343, 345 (M−, Br pattern) detected; 1H NMR (400 mHz, DMSO) δ 12.34 (bs, 1H), 9.39 (bs, 1H), 7.95 (s, 1H), 7.59 (d, 1H), 7.36 (d, 1H), 7.12 (td, 1H).

1. extractionextracted with ethyl acetate
2. washThe combined organic extracts were washed with brine
3. dry with materialdried (MgSO4)
4. concentrationconcentrated under reduced pressure