| 摘要 |
The novel compounds correspond to the formula <IMAGE> in which R represents hydrogen, or optionally substituted alkyl, heteroaryl, aryl, optionally substituted alkoxy, aryloxy, heteroaryloxy, or optionally substituted carbamoyl, COB denotes carboxyl, esterified carboxyl, or an acid amide group, acid anhydride group, acid halide group, or a carboxylate salt group, and X is hydrogen or a nucleophilic group. They are valuable intermediates for preparing antibacterial 1-oxadethiacephalosporins.
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