反应详情

A stirred solution of methyl 3-hydroxy-2-pyridinecarboxylate (1.69 g, 11.0 mmol) in water (75 mL) at ambient temperature was treated dropwise with bromine (2.39 g, 15.0 mmol). The reaction mixture was stirred at ambient temperature for 3 h, during which time a fine white precipitate formed. The mixture was extracted with CH2Cl2 (100 mL×2). The combined organic extracts were washed with water, brine and dried over Na2SO4, filtered, and the filtrate was concentrated to give 2.11 g (82%) of methyl 6-bromo-3-hydroxy-2-pyridinecarboxylate as an off-white solid. 1H NMR (400 MHz, CDCl3): δ 10.69 (s, 1H), 7.55 (d, 1H, J=8.8 Hz), 7.27 (d, 1H, J=8.8 Hz), 4.04 (s, 3H); LRMS (APCI), m/z 232/234 (M+H).

1. customformed
2. extractionThe mixture was extracted with CH2Cl2 (100 mL×2)
3. washThe combined organic extracts were washed with water, brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationthe filtrate was concentrated