反应详情

A total of 10 g of 2-amino-4-fluoro-benzoic acid was dissolved in 129 ml of ethanol, 6.45 ml of sulfuric acid was added and the mixture was heated under reflux for 11 hours. After cooling to room temperature, the solvent was evaporated to about half. Water was added and the mixture was extracted with ethyl acetate. The resulting organic layer was washed with saturated aqueous sodium hydrogencarbonate solution and brine, dried over magnesium sulfate and the solvent was evaporated. The residue was purified and separated by silica gel column chromatography (ethyl acetate:hexane=1:5), to give 7.57 g of the title compound as a pale yellow oil.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 11 hours
3. customthe solvent was evaporated to about half
4. additionWater was added
5. extractionthe mixture was extracted with ethyl acetate
6. washThe resulting organic layer was washed with saturated aqueous sodium hydrogencarbonate solution and brine
7. dry with materialdried over magnesium sulfate
8. customthe solvent was evaporated
9. customThe residue was purified
10. customseparated by silica gel column chromatography (ethyl acetate:hexane=1:5)