反应详情

温度

30 °C

230.6 g (1 mole) of N-(5-chloro-2-hydroxy-3-nitrophenyl)acetamide prepared according to Example 1b was suspended in a mixture of 950 ml of water and 100 ml of 2-propanol under a mild nitrogen purge. 345 ml of 36% w/w hydrochloric acid was added followed by 25 ml of water. The mixture was heated to reflux in about 30° C., while vigorously stirring and refluxed for 2 hours. The mixture was cooled to 0-5° C. in about one hour and stirred for an additional hour at 0-5° C. The solid was filtered off, washed twice with 250 ml of water, and dried at 50° C. and 100 mbar under a gentle nitrogen stream till dry. Yield about 91%.

1. custompurge
2. addition345 ml of 36% w/w hydrochloric acid was added
3. temperatureThe mixture was heated
4. temperaturerefluxed for 2 hours
5. temperatureThe mixture was cooled to 0-5° C. in about one hour
6. stirringstirred for an additional hour at 0-5° C
7. filtrationThe solid was filtered off
8. washwashed twice with 250 ml of water
9. customdried at 50° C.
10. customtill dry