反应详情

Carbazole (16.9 g, 0.1 mol) was dissolved in nitrobenzene (300 mL). Anhydrous AlCl3 (54.0 g, 0.4 mol) was added under stirring in an ice bath. Then AcCl (55.5 g, 0.7 mol) was added slowly dropwise. The reaction mixture was allowed to warm to room temperature under stirring and kept for 13 h. Water (500 mL) was added in small portions under cooling in an ice bath in order to avoid violent foaming. The cooling bath was removed, and the mixture was refluxed with a condenser for 2 h. The product was extracted with chloroform (3×150 mL). The combined extracts were sequentially washed with saturated solutions of NaHCO3 and NaCl, dried with anhydrous Na2SO4, and evaporated. The residue was purified by column chromatography (silica gel, CHCl3-MeOH) to afford 112.5 g (50%).

1. stirringunder stirring
2. temperatureunder cooling in an ice bath in order
3. customThe cooling bath was removed
4. temperaturethe mixture was refluxed with a condenser for 2 h
5. extractionThe product was extracted with chloroform (3×150 mL)
6. washThe combined extracts were sequentially washed with saturated solutions of NaHCO3 and NaCl
7. dry with materialdried with anhydrous Na2SO4
8. customevaporated
9. customThe residue was purified by column chromatography (silica gel, CHCl3-MeOH)
10. customto afford 112.5 g (50%)