反应详情

温度

60 °C

To a solution of 5,6-dimethoxybenzimidazole (0.100 g, 0.8 mmol) was added 60% NaH (0.021 g, 0.88 mmol). After stirring for 30 min, the 4-chlorobenzylbromide (0.171 g, 0.8 mmol) was added and the solution was heated to 60° C. for 2 h. The reaction solution was diluted with EtOAc (10 mL) and washed with aqueous saturated NaHCO3 (2×10 mL). The organic layer was dried with Na2SO4 and concentrated in vacuo. To a solution of the crude alkylated intermediate (0.8 mmol) in CH2Cl2 (10 mL) was added 1 M BBr3 in CH2Cl2 (1 mL, 1 mmol). After stirring for 16 h, the solvent was removed in vacuo and the crude product was purified by reverse-phase preparative HPLC to provide 1-(4-chloro-benzyl)-1H-benzoimidazole-5,6-diol.

1. washwashed with aqueous saturated NaHCO3 (2×10 mL)
2. dry with materialThe organic layer was dried with Na2SO4
3. concentrationconcentrated in vacuo
4. stirringAfter stirring for 16 h
5. customthe solvent was removed in vacuo
6. customthe crude product was purified by reverse-phase preparative HPLC