反应详情

Potassium hydride (3.3 g of 40% oil suspension, washed with ether to remove oil, 0.03 mol) was added to a stirred solution of diethyl (dipropylamino)-malonate (10.2 g, 0.039 mol) in dry THF (100 mL). After 5 minutes, t-butyl, 4-(bromomethyl)-1H-benzimidazole-1-carboxylate (6.22 g, 0.02 mol) was added and the solution was refluxed for 6 hours. The solvent was removed under reduced pressure and the residual oil was partitioned between ethyl acetate and water. After evaporation of the ethyl acetate, the crude product was chromatographed on silica gel using ethyl acetate:hexane as the eluant to give 7.9 g of diethyl {((1,1-dimethylethoxycarbonyl)-1H-benzimidazole-4-yl)methyl}(dipropylamino)-propanedioate as an oil.

1. temperaturethe solution was refluxed for 6 hours
2. customThe solvent was removed under reduced pressure
3. customthe residual oil was partitioned between ethyl acetate and water
4. customAfter evaporation of the ethyl acetate
5. customthe crude product was chromatographed on silica gel