Hydrochloric Acid → Diphenylmethyl 7beta-amino-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylate
反応式
C([NH:3][C@@H:4]1[C:34](=[O:35])[N:6]2[C:7]([C:18]([O:20][CH:21]([C:28]3[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=3)[C:22]3[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=3)=[O:19])=[C:8]([S:11][CH2:12][C:13]3[CH:14]=[N:15][NH:16][CH:17]=3)[CH2:9][S:10][C@H:5]12)=O.Cl>CO>[NH2:3][C@@H:4]1[C:34](=[O:35])[N:6]2[C:7]([C:18]([O:20][CH:21]([C:22]3[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=3)[C:28]3[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=3)=[O:19])=[C:8]([S:11][CH2:12][C:13]3[CH:17]=[N:16][NH:15][CH:14]=3)[CH2:9][S:10][C@H:5]12参加物
4
実験手順
Diphenylmethyl 7β-formamido-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylate (2.96 g) was dissolved in methanol (30 ml) and concentrated hydrochloric acid (2.2 ml) was added thereto at the room temperature. Stirring was continued for 3 hours, then solvent was evaporated. The residue was diluted with a mixture of water. The ethyl acetate and aqueous layer was adjusted to pH 6.5 with 30% aqueous potassium carbonate. The organic layer was separated, washed with water and brine, and dried over magnesium sulfate. Solvent was evaporated to afford diphenylmethyl 7β-amino-3-[(pyrazol-4-yl)methylthio]-3-cephem-4-carboxylate (1.50 g).