Useful intermediates, 7α-acylamino-3-(oxo or exomethylene)-1-dethia-1-oxacepham-4a-carboxylates, are produced by the intramolecular carbenoid insertion of a 2-diazo-3-(oxo or exomethylene)-4-(3α-acylamino-2-oxoazetidin-4β-yl)oxybutyrate prepared in several steps from the corresponding oxazolinoazetidinone and diketone.
有用的中间体 7α-acylamino-3-(oxo or exomethylene)-1-dethia-1-oxacepham-4a-carboxylates 是通过 2-重氮-3-(氧代或外亚甲基)-4-(3α-acylamino-2-oxoazetidin-4β-yl)氧丁酸酯的分子内类羰基插入物,由相应的噁唑烷氮杂环丁酮和二酮经过几个步骤制备而成。
US4539148A
申请人:——
公开号:US4539148A
公开(公告)日:1985-09-03
Production of 1-oxacephams and intermediates
申请人:Shionogi & Co., Ltd.
公开号:US04539148A1
公开(公告)日:1985-09-03
Useful intermediates, 7.alpha.-acylamino-3-(oxo or exomethylene)-1-dethia-1-oxacepham-4.alpha.-carboxylates, are produced by the intramolecular carbenoid insertion of a 2-diazo-3-(oxo or exomethylene)-4-(3.alpha.-acylamino-2-oxoazetidin-4.beta.-yl)oxybutyrate prepared in several steps from the corresponding oxazolinoazetidinone and diketone.