反应详情

温度

0 °C

With exclusion of oxygen, 27.1 g (159.28 mmol) of methyl 5-fluoro-2-hydroxybenzoate are initially charged in 500 ml of dry THF and cooled to 0° C. With cooling, 238 ml (238 mmol) of a 1 M solution of lithium aluminum hydride in THF are then slowly added dropwise, and the mixture is then stirred at 0° C. for 1 hour and then at RT overnight. After the reaction has gone to completion, saturated ammonium chloride solution is added and the mixture is taken up in dichloromethane. The organic phase is separated off and dried over sodium sulfate. After filtration, the solvent is removed under reduced pressure. The crude product is purified chromatographically on silica gel (mobile phase: cyclohexane/ethyl acetate 20:1). This gives 18.0 g (126.6 mmol, 79% of theory) of a colorless solid.

1. temperatureWith cooling
2. customat RT
3. customovernight
4. additionis added
5. customThe organic phase is separated off
6. dry with materialdried over sodium sulfate
7. filtrationAfter filtration
8. customthe solvent is removed under reduced pressure
9. customThe crude product is purified chromatographically on silica gel (mobile phase: cyclohexane/ethyl acetate 20:1)