反应详情

温度

0 °C

To a solution of 4,6-difluoro-2-hydroxynitrobenzene (12.5 g, 71.1 mmol) in DMF (150 ml) was added sodium hydride (60% in oil, 3.70 g, 92.4 mmol) under stirring at 0° C., and the reaction mixture was stirred for 15 minutes. Benzyl bromide (11.0 ml, 92.4 mmol) was added dropwise at 0° C. After completion of the dropwise addition, the reaction mixture was stirred at 80° C. for 18 hours. After cooling to room temperature, the mixture was poured in ice-1N HCl to neutralize therewith, followed by extraction with ether. The extract was washed with saturated brine, dried over anhydrous sodium sulfate, and distilled under reduced pressure to remove the solvent. The residue was purified by chromatography on a silica gel column, whereby from ethyl acetate/hexane (1/5) eluate fractions, 2-benzyloxy-4,6-difluoronitrobenzene (13.7 g, 73%) was obtained as a yellow solid.

1. stirringthe reaction mixture was stirred for 15 minutes
2. additionAfter completion of the dropwise addition
3. stirringthe reaction mixture was stirred at 80° C. for 18 hours
4. temperatureAfter cooling to room temperature
5. extractionfollowed by extraction with ether
6. washThe extract was washed with saturated brine
7. dry with materialdried over anhydrous sodium sulfate
8. distillationdistilled under reduced pressure
9. customto remove the solvent
10. customThe residue was purified by chromatography on a silica gel column, whereby from ethyl acetate/hexane (1/5) eluate fractions