Nitric Acid → Ethyl 5-bromo-6-nitrobenzofuran-3-carboxylate
反応式
[Br:1][C:2]1[CH:3]=[CH:4][C:5]2[O:9][CH:8]=[C:7]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[C:6]=2[CH:15]=1.[N+:16]([O-])([OH:18])=[O:17]>C(Cl)(Cl)Cl>[Br:1][C:2]1[C:3]([N+:16]([O-:18])=[O:17])=[CH:4][C:5]2[O:9][CH:8]=[C:7]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[C:6]=2[CH:15]=1参加物
4
反応条件
- 温度
- 0 °C
実験手順
To a solution of ethyl 5-bromobenzofuran-3-carboxylate (95 g, 353 mmol) in CHCl3 (1000 mL), fuming HNO3 (192 mL, 95%) was added dropwise at −20° C. over 90 min and stirred at 0° C. for 1 hour. The reaction mixture was added to ice water and extracted with CH2Cl2. The organic layer was washed with NaHCO3 and brine. The solvent was removed by distillation to provide the crude product of ethyl 5-bromo-6-nitrobenzofuran-3-carboxylate (95 g, yield: 85%). It was used for the next step without further purification.