反应详情

A solution of 10.0 g of 4-acetamido-2-fluorobenzoic acid, 100 ml of ethyl alcohol and 2.0 ml of boron trifluoride etherate is heated under reflux for 22 hours. The solvent is slowly removed by distillation as an equal amount of fresh ethyl alcohol is added. After 200 ml of solvent has been removed, the remainder is evaporated at reduced pressure. The residue is dissolved in ethyl acetate, washed with saturated aqueous sodium bicarbonate, dried and the solvent then evaporated to yield a solid. Recrystallization of the solid from ethanol-hexane yields ethyl 4-amino-2-fluorobenzoate.

1. temperatureunder reflux for 22 hours
2. customThe solvent is slowly removed by distillation as an equal amount of fresh ethyl alcohol
3. additionis added
4. customAfter 200 ml of solvent has been removed
5. customthe remainder is evaporated at reduced pressure
6. dissolutionThe residue is dissolved in ethyl acetate
7. washwashed with saturated aqueous sodium bicarbonate
8. customdried
9. customthe solvent then evaporated
10. customto yield a solid
11. customRecrystallization of the solid from ethanol-hexane