A process for preparing 3-4-cis-.beta.,.beta.-(4)-substituted and 3-4-trans,.beta.,.alpha.- (4)-substituted azetidinones is provided. Also provided are novel 4,4-disubstituted azetidinones.
提供一种制备3-4-cis-.beta.,.beta.-(4)-取代和3-4-trans,.beta.,.alpha.-(4)-取代的氮杂环
丙酮的方法。同时提供了新型的4,4-二取代氮杂环
丙酮。