Process and intermediates for beta-lactam antibiotics
    7.
    发明授权
    Process and intermediates for beta-lactam antibiotics 失效
    β-内酰胺抗生素的工艺和中间体

    公开(公告)号:US4775752A

    公开(公告)日:1988-10-04

    申请号:US99032

    申请日:1987-09-21

    摘要: A process for preparing a .beta.-keto ester of the formula ##STR1## is provided which comprises cycloaddition of an (S)-4-aryloxazolidin-2-one-3-ylacetyl halide with an imine formed with a benzyl amine and an m-alkoxycinnamaldehyde to form the azetidinone ##STR2## hydrogenation of the azetidinone to the 4-[2-(m-alkoxyphenyl)-ethyl]substituted azetidinone; reduction of the hydrogenation product with Li-NH.sub.3 and t-butyl alcohol to form the 3-aminoazetidinone. ##STR3## and N-acylation of the 3-aminoazetidinone followed by ozonolysis of the cyclodiene group; wherein, e.g. alk, is methyl, Ar is phenyl and R.sub.1 is phenoxymethyl.

    摘要翻译: 提供了制备式“β”的β-酮酯的方法,其包括(S)-4-芳基恶唑烷-2-酮-3-基乙酰卤与由苄基胺形成的亚胺的环加成反应, 烷氧基肉桂醛形成氮杂环丁酮将氮杂环丁酮氢化成4- [2-(间 - 烷氧基苯基) - 乙基]取代的氮杂环丁酮; 用Li-NH 3和叔丁醇还原氢化产物以形成3-氨基氮杂环丁酮。 3-氨基氮杂环丁酮的N-酰化反应,然后进行环二烯基的臭氧分解; 其中,例如 烷基是甲基,Ar是苯基,R 1是苯氧基甲基。