反应详情

4-(Benzylamino)-3,5-difluoro-2,6-dimethoxybenzoic acid (9.1 g, 28.1 mmol) was treated with chlorobenzene (45 mL) and the solution heated to reflux under nitrogen where it was maintained for 16 hours. The solution was cooled to room temperature and extracted with saturated, aqueous sodium bicarbonate solution (2×5 mL) followed by water. The organic layer was concentrated under reduced pressure to an oil that crystallized on standing. This was recrystallized from heptane (10 mL) and toluene (5 mL), the mixture cooled to −10° C., filtered and the crystals washed with heptane (10 mL) and vacuum dried at 35° C. to give N-benzyl-2,6-difluoro-3,5-dimethoxyaniline (7.4 g, 26.5 mmol). mp: 65° C.–66° C.

1. temperaturethe solution heated
2. temperatureto reflux under nitrogen where it
3. temperaturewas maintained for 16 hours
4. extractionextracted with saturated, aqueous sodium bicarbonate solution (2×5 mL)
5. concentrationThe organic layer was concentrated under reduced pressure to an oil that
6. customcrystallized
7. customThis was recrystallized from heptane (10 mL) and toluene (5 mL)
8. temperaturethe mixture cooled to −10° C.
9. filtrationfiltered
10. washthe crystals washed with heptane (10 mL) and vacuum
11. customdried at 35° C.