反应详情

To a solution of 5-(benzyloxy)-2-((2-chlorophenyl)amino)-3,4-difluorobenzoic acid (23.80 g, 61.06 mmol) in DMF (200 mL) was added potassium bicarbonate (9.16 g, 91.6 mmol) followed by benzyl bromide (8.0 mL, 67.37 mmol). The mixture was stirred for 5 h at room temperature and water (300 mL) was added. The solution was extracted with ethyl acetate (100 mL×3). The combined organic extracts were washed with water (200 mL×3) and brine (200 mL) sequentially, dried over Na2SO4, filtered and concentrated in vacuo. After purification by column chromatography on silica gel (petroleum ether/ethyl acetate, 50:1, v/v), the corresponding product was obtained as white solid (27.82 g, 95% yield). 1H NMR (400 MHz, CDCl3): δ 8.56 (s, 1H), 7.52 (dd, J=8.5, 2.1 Hz, 1H), 7.40 (m, 11H), 7.15 (m, 1H), 6.88 (m, 1H), 6.74 (m, 1H), 5.34 (s, 2H), 5.16 (s, 2H).

1. extractionThe solution was extracted with ethyl acetate (100 mL×3)
2. washThe combined organic extracts were washed with water (200 mL×3) and brine (200 mL) sequentially
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customAfter purification by column chromatography on silica gel (petroleum ether/ethyl acetate, 50:1