反应详情

Under a nitrogen atmosphere, 3,6-dibromocarbazole (9.75 g, 30 mmol) was slowly added to a suspension of sodium hydride (45 mmol) in dried THF (100 mL), and then stirred for 30 minutes at room temperature. Benzylbromide (6.72 g, 40 mmol) was dropped into the reaction mixture to be stirred for 20 hours. After addition of water (about 100 mL), a precipitated solid was filtrated, and the filtrate (residuum of the filtration) was washed with an aqueous sodium hydrogencarbonate solution, and then was dissolved in ethanol. The solution was dried by magnesium sulfate, filtrated and concentrated. The residuum was recrystallized with ethanol to give N-benzyl-3,6-dibromocarbazole as a white solid. The yield was 61%.

1. stirringto be stirred for 20 hours
2. filtrationa precipitated solid was filtrated
3. filtrationthe filtrate (residuum of the filtration)
4. washwas washed with an aqueous sodium hydrogencarbonate solution
5. dissolutionwas dissolved in ethanol
6. dry with materialThe solution was dried by magnesium sulfate
7. filtrationfiltrated
8. concentrationconcentrated
9. customThe residuum was recrystallized with ethanol