反应详情

温度

90 °C

A 0° C. mixture of 2-chloro-4-hydroxypyridine (817 mg, 6.30 mmol) in DMF (30 mL) was treated with NaH (60% in mineral oil, 277 mg, 6.93 mmol), stirred for 1 h, treated with 5-bromo-2,4-difluoronitrobenzene (1.50 g, 6.30 mmol) and heated at 90° C. overnight. The mixture was cooled to RT, diluted with water, extracted with EtOAc (2×) and the combined organics were washed with brine, dried over Na2SO4, concentrated to dryness and purified via silica gel chromatography (EtOAc/Hex) to afford 4-(2-bromo-5-fluoro-4-nitrophenoxy)-2-chloropyridine (1.16 g, 53%). MS (ESI) m/z: (M+H+): 348.9.

1. temperatureThe mixture was cooled to RT
2. extractionextracted with EtOAc (2×)
3. washthe combined organics were washed with brine
4. dry with materialdried over Na2SO4
5. concentrationconcentrated to dryness
6. custompurified via silica gel chromatography (EtOAc/Hex)