CO[CH:3](OC)[C:4]1[CH2:5][S:6][C@@H:7]2[C@H:14]([NH:15][C:16](=[O:23])[CH2:17][C:18]3[S:19][CH:20]=[CH:21][CH:22]=3)[C:13](=[O:24])[N:8]2[C:9]=1[C:10]([OH:12])=[O:11].Cl.[CH3:28][O:29][NH2:30]>O1CCCC1.O>[CH3:28][O:29][N:30]=[CH:3][C:4]1[CH2:5][S:6][C@@H:7]2[C@H:14]([NH:15][C:16](=[O:23])[CH2:17][C:18]3[S:19][CH:20]=[CH:21][CH:22]=3)[C:13](=[O:24])[N:8]2[C:9]=1[C:10]([OH:12])=[O:11]To a solution of 3-dimethoxymethyl-7β-(2-thienylacetamido)-3-cephem-4-carboxylic acid (76 mg) in tetrahydrofuran (4 ml) is added a solution of O-methylhydroxylamine hydrochloride (23 mg) in water (1 ml), and the mixture is kept at room temperature for 10 hours. The reaction mixture is evaporated to remove tetrahydrofuran, and the separated solid material is collected by filtration. Recrystallization of the solid from a mixture of ethyl acetate and ether gives 3-methoxyiminomethyl-7β-(2-thienylacetamido)-3-cephem-4-carboxylic acid (61 mg). m.p. 186°-189° C. Yield: 80%.
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