反应详情

In 150 ml of N,N-dimethylformamide is dissolved 12.3 g of 3(S)-tert-butoxycarbonylamino-2,3,4,5-tetrahydro-1,5-benzoxazepine-4-one, and 8.7 g of benzyl chloroacetate, 8.7 g of anhydrous potassium carbonate and 1 g of potassium iodide are added to the solution. After stirring for 15 hours, the mixture is poured in ice-cooled water. The deposited material is collected by filtration, washed with water and recrystallized from ethyl acetate-hexane to give 11.7 g of benzyl 3(S)-tert-butoxycarbonylamino-4-oxo-2,3,4,5-tetrahydro-1,5-benzoxazepine-5-acetate as colorless prisms, melting at 122°-124° C.

1. additionare added to the solution
2. additionthe mixture is poured in ice-
3. filtrationThe deposited material is collected by filtration
4. washwashed with water
5. customrecrystallized from ethyl acetate-hexane