N-bromobutanimide → Ethyl 2-bromomethyl-4-(3,4-dimethoxyphenyl)-6,7-dimethoxyquinoline-3-carboxylate
反応式
[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][C:12]=1[O:13][CH3:14])[N:9]=[C:8]([CH3:15])[C:7]([C:16]([O:18][CH2:19][CH3:20])=[O:17])=[C:6]2[C:21]1[CH:26]=[CH:25][C:24]([O:27][CH3:28])=[C:23]([O:29][CH3:30])[CH:22]=1.[Br:31]N1C(=O)CCC1=O>C(Cl)(Cl)(Cl)Cl>[Br:31][CH2:15][C:8]1[C:7]([C:16]([O:18][CH2:19][CH3:20])=[O:17])=[C:6]([C:21]2[CH:26]=[CH:25][C:24]([O:27][CH3:28])=[C:23]([O:29][CH3:30])[CH:22]=2)[C:5]2[C:10](=[CH:11][C:12]([O:13][CH3:14])=[C:3]([O:2][CH3:1])[CH:4]=2)[N:9]=1参加物
4
実験手順
A mixture of ethyl 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)-2-methylquinoline-3-carboxylate (411 mg), N-bromosuccinimide (214 mg), 2,2-azobis(isobutyronitrile)(10 mg) and carbon tetrachloride (10 ml) was stirred under reflux for 5 hours. The reaction mixture was washed with water, dried over magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was subjected to column chromatography on silica gel. The fractions eluted with chloroform/ethyl acetate (10/1, v/v) gave ethyl 2-bromomethyl-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylate (285 mg, 58%) which was then recrystallized from ethyl acetate-hexane. Colorless prisms. mp. 135°-136° C.