反应详情

温度

0 °C

To a stirred solution of ethyl 3-(1H-benzo[d]imidazol-2-yl)propanoate 6a (2.85 g, 13.1 mmol, 1.0 eq.) in tetrahydrofuran (100 mL) at 0° C., was added 60% sodium hydride in mineral oil (784 mg, 19.6 mmol, 1.5 eq.), and the reaction was stirred at 0° C. for 20 minutes. Benzyl bromide (4.47 g, 26.1 mmol, 2.0 eq.) was added at 0° C., and the reaction was stirred, with warming to room temperature, for 16 hours. The mixture was concentrated in vacuo and water (100 mL) was carefully added. The aqueous layer was extracted with dichloromethane (3×75 mL), and the combined organic extracts were washed with 1M hydrochloric acid (100 mL) and brine (100 mL). The organic layer was dried over magnesium sulfate and concentrated in vacuo. Purification by flash chromatography (5% MeOH:95% EtOAc) gave 6b as an orange oil (3.32 g, 82%).

1. stirringthe reaction was stirred
2. temperaturewith warming to room temperature, for 16 hours
3. concentrationThe mixture was concentrated in vacuo and water (100 mL)
4. additionwas carefully added
5. extractionThe aqueous layer was extracted with dichloromethane (3×75 mL)
6. washthe combined organic extracts were washed with 1M hydrochloric acid (100 mL) and brine (100 mL)
7. dry with materialThe organic layer was dried over magnesium sulfate
8. concentrationconcentrated in vacuo
9. customPurification by flash chromatography (5% MeOH:95% EtOAc)