反应详情

温度

50 °C

(RS)-1-[1-(Acenaphthen-1-yl)piperidin-4-yl]-1,3-dihydro-2H-benzoimidazol-2-one (1.5 g, 4 mmol) was dissolved in dimethylformamide (DMF, 15 ml). Sodium hydride (200 mg, 60%) was added and the suspension was stirred at 50° C. for 30 min. The mixture was cooled to room temperature, ethyl bromoacetate (0.75 g, 4.5 mmol) was added and the mixture was stirred for 1 hr. The reaction mixture was poured into water and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated aqueous ammonium chloride solution, dried over magnesium sulfate, and concentrated. The obtained residue was purified by silica gel column chromatography (chloroform/methanol) to give the title compound (1.6 g) as pale-yellow crystals.

1. temperatureThe mixture was cooled to room temperature
2. stirringthe mixture was stirred for 1 hr
3. extractionthe mixture was extracted with ethyl acetate
4. washThe extract was washed with water and saturated aqueous ammonium chloride solution
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated
7. customThe obtained residue was purified by silica gel column chromatography (chloroform/methanol)