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温度

0 °C

5-Bromo-2-nitropyridine (1 g, 4.93 mmol) was dissolved in DMF (32 ml) and cooled to 0° C. Cesium carbonate (2.408 g, 7.39 mmol) was added, followed by 2-chloro-4-hydroxypyridine (0.702 g, 5.42 mmol). The mixture was stirred in an 80° C. oil bath for 24 hours. The reaction mixture was then cooled to RT, diluted with ethyl acetate (150 mL), washed with water (2×100 mL) and brine (50 mL), dried (MgSO4), evaporated under reduced pressure and purified via silica gel chromatography (ethyl acetate-hexanes) to yield 2-chloro-4-(6-nitropyridin-3-yloxy)pyridine as a clear oil (0.540 g, 44% yield). 1H NMR (400 MHz, DMSO-d6): δ 8.62 (d, 1H), 8.41 (m, 2H), 8.06 (d, 1H), 7.37 (d, 1H), 7.23 (dd, 1H); MS (ESI) m/z: 252.0 (M+H+).

1. temperatureThe reaction mixture was then cooled to RT
2. washwashed with water (2×100 mL) and brine (50 mL)
3. dry with materialdried (MgSO4)
4. customevaporated under reduced pressure
5. custompurified via silica gel chromatography (ethyl acetate-hexanes)