反应详情

To a solution of 7-amino-1-phenyl-5-trifluoromethylbenzimidazole (0.50 g, 1.81 mmol) in anhydrous toluene (10 ml) was added benzaldehyde, p-toluenesulphonic acid (10 mg) and molecular sieves. The resultant mixture was stirred at reflux for 1.5 hours. The molecular sieves were removed by filtration and the filtrate was concentrated under reduced pressure. The concentrate was partitioned between aqueous sodium carbonate (2M) and ethyl acetate. The organic phase was dried and concentrated, and the concentrate was eluted through silica gel with a mixture of ethyl acetate and ligroin (1:1 v/v). Removal of solvent from the eluate left the desired product as a yellow solid (0.37 g, 56%) m/z, 366.1 (M+H)+.

1. temperatureat reflux for 1.5 hours
2. customThe molecular sieves were removed by filtration
3. concentrationthe filtrate was concentrated under reduced pressure
4. customThe concentrate was partitioned between aqueous sodium carbonate (2M) and ethyl acetate
5. customThe organic phase was dried
6. concentrationconcentrated
7. washthe concentrate was eluted through silica gel with a mixture of ethyl acetate and ligroin (1:1 v/v)
8. customRemoval of solvent from the eluate
9. waitleft the desired product as a yellow solid (0.37 g, 56%) m/z, 366.1 (M+H)+