发明授权
US4233216A Azetidinone derivatives and production thereof 失效
氮杂环丁酮衍生物及其制备

Azetidinone derivatives and production thereof
摘要:
.alpha.-[3(R)-Substituted amino-4(R)-substituted alkoxy-2-oxo-azetidin-1-yl]-.alpha.-isopropenylacetate (Ia) and .alpha.-[3(R)-substituted amino-4(R)-substituted alkoxy-2-oxo-azetidin-1-yl]-.alpha.-isopropylideneacetate (Ib) prepared from (1R,5S)-.alpha.-(3-substituted-7-oxo-4-oxa-2,6-diazabicyclo[3.2.0]hept-2-en-6-yl)-.alpha.-isopropenylacetate or (1R,5S)-.alpha.-(3-substituted-7-oxo-4-oxa-2,6-diazabicyclo-[3.2.0]hept-2-en-6-yl)-.alpha.-isopropylideneacetate with a primary alcohol in the presence of an acid. The products are useful intermediates for preparing oxadethiacephalosporins.
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