反应详情

To a suspension of methyl 6-aminopyridine-2-carboxylate (5.98 g, 39.5 mmol) and sodium carbonate (2.64 g, 24.9 mmol) in acetic acid (150 mL) was added bromine (7.89 g, 49.4 mmol), and the mixture was stirred at room temperature for 7 hr. The solvent was evaporated under reduced pressure, and the residue was diluted with ethyl acetate, and washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine. This was dried over anhydrous sodium sulfate and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate/hexane=30/70→80/20) to give the title compound (2.67 g, yield 29%).

1. customThe solvent was evaporated under reduced pressure
2. additionthe residue was diluted with ethyl acetate
3. washwashed with saturated aqueous sodium hydrogen carbonate solution and saturated brine
4. dry with materialThis was dried over anhydrous sodium sulfate
5. customthe solvent was evaporated under reduced pressure
6. customThe residue was purified by silica gel column chromatography (ethyl acetate/hexane=30/70→80/20)