Preparation of 3-alkyl-3-cephem-4-carboxylic acid compounds from dithio
isopropenyl azetidine carboxylic compounds
    9.
    发明授权
    Preparation of 3-alkyl-3-cephem-4-carboxylic acid compounds from dithio isopropenyl azetidine carboxylic compounds 失效
    由二硫异丙烯基氮杂环丁烷羧酸化合物制备3-烷基-3-头孢烯-4-羧酸化合物

    公开(公告)号:US4091210A

    公开(公告)日:1978-05-23

    申请号:US674234

    申请日:1976-04-06

    CPC分类号: C07D501/08 C07D205/095

    摘要: A new process for preparing 3-alkyl-3-cephem-4-carboxylic acids of the general formula: ##STR1## wherein R.sub.1 is amino or a substituted amino, R.sup.2 is carboxy or a protected carboxy and R.sup.3 is a lower alkyl, andNew intermediates of the general formula: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are each as defined above and Y' is a residue of ammonia or a saturated aliphatic amine or a secondary cyclic amine, comprises reacting a compound of the formula ##STR3## wherein X is a residue of a thiol compound, with a condensing agent or a polar solvent, or with ammonia or an amine, respectively. In the latter case, the resultant new intermediate may further be reacted with a condensing agent or a polar solvent to form a 3-alkyl-3-cephem-4-carboxylic acid as above.

    摘要翻译: 一种制备以下通式的3-烷基-3-头孢烯-4-羧酸的新方法:其中R1是氨基或取代的氨基,R2是羧基或被保护的羧基,R3是低级烷基,新的 通用化合物的中间体:其中R 1,R 2和R 3各自如上所定义,Y'是氨或饱和脂族胺或仲环状胺的残基,包括使下式化合物 X是硫醇化合物,缩合剂或极性溶剂,或分别与氨或胺的残基。 在后一种情况下,所得新的中间体可进一步与缩合剂或极性溶剂反应,形成如上所述的3-烷基-3-头孢烯-4-羧酸。