反应详情

To a solution of 5-bromo-2-chloropyridine-3-amine (3.9 g, 18.9 mmol) and triethylamine (5.3 mL, 37.9 mmol) in tetrahydrofuran (60 mL) was added 2-nitrobenzoylchloride (2.49 mL, 18.9 mmol). The reaction was stirred for 24 hours. The reaction mixture was diluted with ethyl acetate (200 mL) and saturated aqueous sodium bicarbonate (60 mL). The organic layer was separated and washed with water (50 mL), brine (50 mL), dried over sodium sulfate, filtered and concentrated to dryness under reduced pressure. The crude product was purified by flash chromatography (SiO2, 25% ethyl acetate in hexanes). The N-(5-bromo-2-chloropyridin-3-yl)-2-nitrobenzamide was obtained as a yellow solid (1.5 g). LCMS [M+H]: 356.

1. customThe organic layer was separated
2. washwashed with water (50 mL), brine (50 mL)
3. dry with materialdried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated to dryness under reduced pressure
6. customThe crude product was purified by flash chromatography (SiO2, 25% ethyl acetate in hexanes)