反应详情

To a solution of methyl 3-amino-2-methoxybenzoate (94 g, 580 mmol) (from composite batches prepared as described above) in THF (1800 mL), saturated NaHCO3 (60.9 g, 725 mmol) was added. Then 2-propen-1-yl chloridocarbonate (83.7 g, 696 mmol) was added dropwise at 0° C. The mixture was stirred at rt for 2 h. The solution was extracted with EtOAc (700 mL×3). The combined organic layers were washed with water and brine successively, dried over Na2SO4, filtered and concentrated under reduced pressure to give the title compound of Step D (123 g, 80% yield), which was used in the next step directly. 1H NMR (400 MHz, CDCl3) δ ppm 8.25-8.35 (m, 1H), 7.49-7.53 (m, 1H), 7.36-7.42 (br, 1H), 7.10-7.18 (m, 1H), 5.91-6.07 (m, 1H), 5.75-5.90 (m, 2H), 4.63-4.70 (m, 2H), 3.92 (s, 3H), 3.86 (s, 3H).

1. additionThen 2-propen-1-yl chloridocarbonate (83.7 g, 696 mmol) was added dropwise at 0° C
2. extractionThe solution was extracted with EtOAc (700 mL×3)
3. washThe combined organic layers were washed with water and brine successively
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure