反应详情

To a solution of 3-(4,4-dimethoxy-butyl)-1-(benzyloxy)-urea (4.14 g, 14.7 mmol) in DMF (40 mL) was added NaH (60 wt % in mineral oil, 0.659 g, 16.5 mmol). After 30 minutes, 1,2-dibromoethane (1.30 mL, 15.1 mmol) was added and the mixture was stirred for an additional 40 minutes. An additional amount of NaH (60 wt % in mineral oil, 0.636 g, 15.9 mmol) was added and the mixture was stirred at room temperature for 3 hours. The mixture was diluted with EtOAc (150 mL), washed with brine (5×25 mL), dried (MgSO4), and concentrated. Purification of the crude material by column chromatography on silica gel (1:1 hexanes-EtOAc) provided 1.61 g (36%) of 1-Benzyloxy-3-(4,4-dimethoxy-butyl)-imidazolidin-2-one as a colorless oil.

1. stirringthe mixture was stirred at room temperature for 3 hours
2. washwashed with brine (5×25 mL)
3. dry with materialdried (MgSO4)
4. concentrationconcentrated
5. customPurification of the crude material by column chromatography on silica gel (1:1 hexanes-EtOAc)