Butanedione → 5-Bromo-8-(3,5-dimethoxy-phenyl)-2,3-dimethyl-quinoxaline
반응식
[Br:1][C:2]1[CH:7]=[C:6](OC)[C:5]([C:10]2[CH:15]=[CH:14][CH:13]=[C:12]([O:16][CH3:17])[CH:11]=2)=[C:4]([NH2:18])[C:3]=1[NH2:19].[CH3:20][C:21](=O)[C:22](=O)[CH3:23].C[CH2:27][OH:28]>>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:10]2[CH:11]=[C:12]([O:16][CH3:17])[CH:13]=[C:14]([O:28][CH3:27])[CH:15]=2)=[C:4]2[C:3]=1[N:19]=[C:22]([CH3:23])[C:21]([CH3:20])=[N:18]2참가 물질
4
실험 절차
A mixture of 4-bromo-3′,6-dimethoxy-biphenyl-2,3-diamine (Step 85.7) (3 g, 9.3 mmol) and 2,3-butanedione (1 mL, 11.1 mmol, 1.2 equiv) in EtOH (60 mL) was stirred at reflux for 2 h, allowed to cool to it and stirred for 16 h. Additional 2,3-butanedione (0.4 ml) was added. The reaction mixture was stirred at reflux for 2 h, allowed to cool and concentrated to half of the initial volume. The resulting yellow precipitate was collected vacuum filtration providing 2.9 g of the title compound: ES-MS: 373.1/375.0 [M+H]+; tR=5.60 min (System 1).