反应详情

24 g of 2-aminophenol, 55 g of methyl 2,5-dibromovalerate and 30 g of potassium carbonate were heated to reflux for 5 hours in 250 ml of acetone. For work-up, the reaction mixture was diluted with 250 ml of diethyl ether, washed with 200 ml of water and acidified to pH=1 using 12N hydrochloric acid solution. The organic phase was separated, washed twice with 100 ml of water each time, dried and evaporated. The residue was crystallized from methanol. 11 g of 2-(3-bromopropyl)-2H-1,4-benzoxazin-3(4H)one were obtained.

1. washwashed with 200 ml of water
2. customThe organic phase was separated
3. washwashed twice with 100 ml of water each time
4. customdried
5. customevaporated
6. customThe residue was crystallized from methanol