Trifluoroacetic acid → 7beta-amino-3-[2-(N-carboethoxysulfamoyl)benzoyloxy]methyl-3-cephem-4-carboxylic acid
反応式
C(OC([NH:8][C@@H:9]1[C:38](=[O:39])[N:11]2[C:12]([C:35]([OH:37])=[O:36])=[C:13]([CH2:16][O:17][C:18](=[O:34])[C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][C:20]=3[S:25](=[O:33])(=[O:32])[NH:26][C:27]([O:29][CH2:30][CH3:31])=[O:28])[CH2:14][S:15][C@H:10]12)=O)(C)(C)C.FC(F)(F)C(O)=O>CCOCC>[NH2:8][C@@H:9]1[C:38](=[O:39])[N:11]2[C:12]([C:35]([OH:37])=[O:36])=[C:13]([CH2:16][O:17][C:18](=[O:34])[C:19]3[CH:24]=[CH:23][CH:22]=[CH:21][C:20]=3[S:25](=[O:33])(=[O:32])[NH:26][C:27]([O:29][CH2:30][CH3:31])=[O:28])[CH2:14][S:15][C@H:10]12参加物
4
実験手順
7β-(t-Butoxycarbonyl)amino-3-[2-(N-carboethoxysulfamoyl)benzoyloxy]methyl-3-cephem-4-carboxylic acid (2.2 g) is dissolved in ice cooled solution of trifuoroacetic acid (20 ml) and the mixture is stirred for 20 minutes. Then trifluoroacetic acid is taken off under reduced pressure and viscous residue is obtained. The residue becomes solid upon addition of ether (50 ml). The solid is triturated, collected by filtration, washed with ether and dried over phosphorus pentoxide. The procedure provides 7β-amino-3-[2-(N-carboethoxysulfamoyl)benzoyloxy]methyl-3-cephem-4-carboxylic acid (1.55 g).