申请人:Shionogi & Co., Ltd.
公开号:US04233216A1
公开(公告)日:1980-11-11
.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-e n-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.
从(1R,5S)-α-(3-取代-7-氧代-4-氧杂-2,6-二氮杂双环[3.2.0]庚-2-烯-6-基)-α-异丙基乙酸酯或(1R,5S)-α-(3-取代-7-氧代-4-氧杂-2,6-二氮杂双环[3.2.0]庚-2-烯-6-基)-α-异丙基亚乙酸酯与一种原始醇在酸的存在下制备α-[3(R)-取代氨基-4(R)-取代烷氧基-2-氧代-氮杂丙二酸-1-基]-α-异丙基酸酯(Ia)和α-[3(R)-取代氨基-4(R)-取代烷氧基-2-氧代-氮杂丙二酸-1-基]-α-异丙基亚乙酸酯(Ib)。 该产品是制备氧代头孢菌素的有用中间体。