Bromine → Ethyl 4-amino-3-bromo-5-nitrobenzoate
反応式
[NH2:1][C:2]1[CH:12]=[CH:11][C:5]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[CH:4][C:3]=1[N+:13]([O-:15])=[O:14].[Br:16]Br>C(Cl)Cl>[NH2:1][C:2]1[C:3]([N+:13]([O-:15])=[O:14])=[CH:4][C:5]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[CH:11][C:12]=1[Br:16]参加物
4
実験手順
To a solution of ethyl 4-amino-3-nitrobenzoate (D212) (21.0 g, 100 mmol, 1 equiv) in CH2Cl2 (500 ml) at room temperature was added bromine (6.7 ml, 130 mmol, 1.3 equiv) and the resulting mixture was refluxed for 4 h then bromine (2 ml, 40 mmol, 0.4 equiv) was added and the resulting mixture refluxed for another 3 h then cooled to room temperature. The organic phase was washed twice with a 10% aqueous Na2S2O3 solution and twice with H2O, dried over MgSO4 and concentrated in vacuo to give ethyl 4-amino-3-bromo-5-nitrobenzoate (D213) (27.1 g, 94%) as a yellow solid which was used in the next step without further purification.