[CH:1]([NH:3][C:4]1[S:5][CH:6]=[C:7]([C:9](=[N:27][O:28][CH3:29])[C:10]([NH:12][C@@H:13]2[C:25](=[O:26])[N:15]3[C:16]([C:22]([OH:24])=[O:23])=[C:17]([CH2:20]Cl)[CH2:18][S:19][C@H:14]23)=[O:11])[N:8]=1)=[O:2].[CH3:30][N:31]1[CH2:36][CH2:35][N:34]([C:37](=[O:46])[C:38]2[CH:43]=[CH:42][C:41]([OH:44])=[C:40]([OH:45])[CH:39]=2)[CH2:33][CH2:32]1.C(OCC)(=O)C>CN(C)C=O>[CH:1]([NH:3][C:4]1[S:5][CH:6]=[C:7]([C:9](=[N:27][O:28][CH3:29])[C:10]([NH:12][C@@H:13]2[C:25](=[O:26])[N:15]3[C:16]([C:22]([O-:24])=[O:23])=[C:17]([CH2:20][N+:31]4([CH3:30])[CH2:36][CH2:35][N:34]([C:37](=[O:46])[C:38]5[CH:43]=[CH:42][C:41]([OH:44])=[C:40]([OH:45])[CH:39]=5)[CH2:33][CH2:32]4)[CH2:18][S:19][C@H:14]23)=[O:11])[N:8]=1)=[O:2]To a solution of 7β-[2-(2-formamidothiazol-4-yl)-2-methoxyiminoacetamido]-3-chloromethyl-3-cephem-4-carboxylic acid (syn isomer) (920 mg) in N,N-dimethylformamide (5 ml) was added 1-methyl-4-(3,4-dihydroxybenzoyl)piperazine (945 mg) at 0° C. and the mixture was stirred at 0° C. for 3.5 hours. The mixture was added dropwise to ethyl acetate (200 ml) under stirring and the pulverized product was collected by filtration and washed with ethyl acetate to give 7β-[2-(2-formamidothiazol-4-yl)-2-methoxyiminoacetamido]-3-[1-methyl-4-(3,4-dihydroxybenzoyl)-1-piperazinio]methyl-3-cephem-4-carboxylate (syn isomer) (1.53 g).
読み込み中…