反应详情

To 3,5-difluoro-4-(4-methoxy-benzylamino)-benzonitrile (26.2 g, 95.5 mmol) obtained in Step A, methanol (300 ml) and 5M-NaOH aqueous solution (150 ml) were added, followed by heating to reflux for 58 hours. The solvent was distilled off under reduced pressure, and dichloromethane (200 ml) was added, followed by extraction with 1M-NaOH aqueous solution (200 ml×3). To the aqueous layer, 6M−HCl aqueous solution was added to adjust the pH to 6, followed by extraction with ethyl acetate (300 ml×2). After the organic layer was dried over sodium sulfate, the solvent was distilled off under reduced pressure. The resulting solid was washed with n-hexane, and the desired compound was obtained as a colorless solid (25.6 g, 91%).

1. temperatureby heating
2. temperatureto reflux for 58 hours
3. distillationThe solvent was distilled off under reduced pressure, and dichloromethane (200 ml)
4. additionwas added
5. extractionfollowed by extraction with 1M-NaOH aqueous solution (200 ml×3)
6. additionTo the aqueous layer, 6M−HCl aqueous solution was added
7. extractionfollowed by extraction with ethyl acetate (300 ml×2)
8. dry with materialAfter the organic layer was dried over sodium sulfate
9. distillationthe solvent was distilled off under reduced pressure
10. washThe resulting solid was washed with n-hexane