反应详情

温度

25 °C

Benzyl 4-(benzyloxy)-5-methoxy-2-nitrobenzoate (77 g) was dissolved in acetonitrile (882 ml). Sodium dithionite (160.5 g) was added to the solution and the temperature adjusted to 25° C. Water (588 ml) was then added, maintaining the temperature at 25° C. The pH was maintained at 6 using 8.8 M sodium hydroxide during the reduction. The slurry was then heated to 65° C. and the lower aqueous phase was removed. Concentrated hydrochloric acid (35% w/w, 7.25 ml) was then added. The slurry was allowed to cool to 40° C. and then to 20° C. Sodium hydroxide solution (47% w/w, 12.4 ml) was added and the slurry cooled to 0° C. The product (benzyl 2-amino-4-(benzyloxy)-5-methoxybenzoate) was isolated by filtration, washed with water (2×196 ml) and then dried at 40° C. under vacuum. Yield: 66.2 g, 92.4%;

1. customadjusted to 25° C
2. temperatureThe slurry was then heated to 65° C.
3. customthe lower aqueous phase was removed
4. additionConcentrated hydrochloric acid (35% w/w, 7.25 ml) was then added
5. temperatureto cool to 40° C.
6. customto 20° C
7. additionSodium hydroxide solution (47% w/w, 12.4 ml) was added
8. temperaturethe slurry cooled to 0° C