反应详情

To a 100 mL round-bottomed flask were added a stir bar, ethyl 3-(5-methoxy-1H-benzo[d]imidazol-2-yl)-2,2-dimethylpropanoate (1.5 g, 5.4 mmol), DMF (19 mL), cesium carbonate (3.5 g, 11 mmol), and 4-bromobenzyl bromide (1.4 g, 5.4 mmol). After 12 h, the mixture was partitioned between water (100 mL) and EtOAc (50 mL). The aqueous layer was extracted with EtOAc (50 mL×3). The combined organic layers were dried with sodium sulfate, filtered, and concentrated to dryness. The residue was subjected to FCC to give ethyl 3-(1-(4-bromobenzyl)-6-methoxy-1H-benzo[d]imidazol-2-yl)-2,2-dimethylpropanoate (550 mg, 23%) and ethyl 3-(1-(4-bromobenzyl)-5-methoxy-1H-benzo[d]imidazol-2-yl)-2,2-dimethylpropanoate (620 mg, 26%).

1. additionTo a 100 mL round-bottomed flask were added a stir bar
2. customthe mixture was partitioned between water (100 mL) and EtOAc (50 mL)
3. extractionThe aqueous layer was extracted with EtOAc (50 mL×3)
4. dry with materialThe combined organic layers were dried with sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated to dryness