| 摘要 |
A process for preparing lactams, particularly 1-azabicyclo[4.2.0]octanes, 1-azabicyclo[3.2.0]heptanes, 4-thia-1-azabicyclo[3.2.0]heptanes and 5-thia-1-azabicyclo[4.2.0]octenes, which comprises subjecting a cyclic alpha -ketoamide to an oxidizing agent to form a carboxyl substituted lactam structure. The oxidant is preferably periodate, in an aqueous solution, at pH 5-9 and room temperature. The novel products obtained from the process are useful intermediates in the preparation of antimicrobial agents. The cyclic alpha -ketoamide starting materials are also novel.
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