反应详情

To a solution of phenylmethyl 2-(2,5-dioxoimidazolidinyl)acetate (4.0 g, 16.1 mmol) in DMF (50 ml) at 0° C. were added lithium tert-butoxide (1.6 g, 19.3 mmol) and benzyl bromide (2.1 ml, 17.7 mmol). After stirring the mixture at room temperature overnight, the reaction mixture was poured into water (100 ml) and the mixture was extracted with ethyl acetate. The organic phase was washed with water, 10% aqueous citric acid solution, saturated aqueous sodium hydrogen carbonate solution and brine. The organic solution was dried over anhydrous magnesium sulfate, filtered and evaporated under reduced pressure. The residue was purified by column chromatography (silica gel, n-hexane:ethyl acetate=3:1) to give phenylmethyl 2-(2,5-dioxo-3-benzylimidazolidinyl)acetate (3.42 g).

1. extractionthe mixture was extracted with ethyl acetate
2. washThe organic phase was washed with water, 10% aqueous citric acid solution, saturated aqueous sodium hydrogen carbonate solution and brine
3. dry with materialThe organic solution was dried over anhydrous magnesium sulfate
4. filtrationfiltered
5. customevaporated under reduced pressure
6. customThe residue was purified by column chromatography (silica gel, n-hexane:ethyl acetate=3:1)