反应详情

温度

80 °C

N-(3-Nitrobenzyl)urea (78 g) was dissolved in 500 mL of 80% acetic acid, 120 g of benzyl 2-benzyloxy-2-hydroxyacetate was added thereto at 80° C. and the mixture was stirred at 80° C. for two hours. The mixture was concentrated in vacuo and the solvent was evaporated therefrom by means of an azeotropic distillation with toluene. The residue was purified by a silica gel column and recrystallized from a mixed solvent of ethyl acetate and hexane to give 49 g of 5-hydroxy-1-(3-nitrobenzyl)-2,4-dioxoimidazolidine.

1. concentrationThe mixture was concentrated in vacuo
2. customthe solvent was evaporated
3. distillationby means of an azeotropic distillation with toluene
4. customThe residue was purified by a silica gel column
5. customrecrystallized from a mixed solvent of ethyl acetate and hexane