反应详情

In 10N NaOH (13.1 ml, 131 mmol) and DMSO (25 ml), 3,5-difluoro-2-nitroanisole (8.29 g, 43.8 mmol) was stirred at 50° C. for 5 hours. After cooling, the reaction mixture was poured in 1N HCl (200 ml), followed by extraction with ethyl acetate (300 ml). The extract was washed with saturated brine (2×100 ml), dried over anhydrous magnesium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by chromatography on a silica gel column, whereby from hexane-ethyl acetate (4:1) eluate fractions, the title compound (4.14 g, 51%) was obtained as a yellow oil.

1. temperatureAfter cooling
2. extractionfollowed by extraction with ethyl acetate (300 ml)
3. washThe extract was washed with saturated brine (2×100 ml)
4. dry with materialdried over anhydrous magnesium sulfate
5. distillationdistilled under reduced pressure
6. customto remove the solvent
7. customThe residue was purified by chromatography on a silica gel column, whereby from hexane-ethyl acetate (4:1) eluate fractions