反应详情

温度

45 °C

To a mixture of ethyl 5-bromo-8-carbamoyl-9H-carbazole-2-carboxylate (90 g, 249 mmol), CCl4 (2900 mL), and NMP (600 mL) was added NCS (36.1 g, 271 mmol). The reaction mixture was stirred at 45° C. for 2 h. After cooling to room temperature, the solid was collected by vacuum filtration. The solid was stirred in methanol (1 L) at 60° C. for 2 h and then cooled to room temperature. The solid was collected and dried to give ethyl 5-bromo-8-carbamoyl-6-chloro-9H-carbazole-2-carboxylate (69.5 g, 167 mmol, 67% yield) (95% purity).

1. temperatureAfter cooling to room temperature
2. filtrationthe solid was collected by vacuum filtration
3. stirringThe solid was stirred in methanol (1 L) at 60° C. for 2 h
4. temperaturecooled to room temperature
5. customThe solid was collected
6. customdried