反应详情

温度

60 °C

10 mmol of 3-acetyl-4-nitro-aminobenzene as a starting material was added to 100 mL of HBr/H2O (1/2, v/v) and a sodium nitrite solution was slowly added dropwise thereto in an ice bath. The reaction mixture was stirred at 60° C. for 2 hours. When the reaction was completed, the precipitate was filtered off. The filtrate was neutralized with 1N NaOH, extracted with EtOAc, dried over anhydrous sodium sulfate, distilled under reduced pressure and purified by silica gel column chromatography (hexane/EtOAc=2/1) to obtain the desired 3-acetyl-4-nitro-bromobenzene as a yellow oil (75%).

1. filtrationthe precipitate was filtered off
2. extractionextracted with EtOAc
3. dry with materialdried over anhydrous sodium sulfate
4. distillationdistilled under reduced pressure
5. custompurified by silica gel column chromatography (hexane/EtOAc=2/1)