反应详情

In an aqueous solution (150 ml) of 6.1 g of sodium carbonate is dissolved 11.7 g of 2-amino-4-(2-nitrophenyl)-butyric acid, and 15 g of N-ethoxycarbonylphthalimide is added to the solution under stirring. After stirring at room temperature overnight, the insoluble material is removed by filtration, and the filtrate is made weakly acidic with concentrated hydrochloric acid. The viscous material, which separates out, is admixed with 50 ml of ethanol, followed by stirring, whereby there separate out crystals. The crystals are collected by filtration and dried to give 13 g of 4-(2-nitrophenyl)-2-phtalimidobutyric acid as colorless crystals. m.p. 177°-179° C.

1. additionis added to the solution
2. stirringAfter stirring at room temperature overnight
3. customthe insoluble material is removed by filtration
4. stirringby stirring
5. customwhereby there separate out crystals
6. filtrationThe crystals are collected by filtration
7. customdried