Process for the preparation of cephem derivatives
    1.
    发明授权
    Process for the preparation of cephem derivatives 失效
    头孢烯衍生物的制备方法

    公开(公告)号:US5317099A

    公开(公告)日:1994-05-31

    申请号:US959359

    申请日:1992-10-13

    CPC分类号: C07D501/00

    摘要: A process for preparing B-lactam derivatives of the formula (I): ##STR1## wherein R.sup.1 represents hydrogen or a metal salt; and R.sup.2 represents hydrogen, acetoxy methyl, (2,5-dihydro-2-methyl-6-hydroxy-5-oxo-as-triazin-3-yl)thiomethyl or (1-methyl-1-H-tetrazol-5-yl)thiomethyl is disclosed. This process comprises the steps of (a) reacting triphenylphosphine and hexachloroethane or carbon tetrachloride with 2-(2-aminothiazol-4-yl)-2-syn-methoxyimino acetic acid in an organic solvent to give the corresponding acyloxyphosphonium chloride derivative of the formula: ##STR2## (b) acylating a previously silylated derivative of 7-ACA with this acyloxyphosphonium chloride derivative without its isolation.

    摘要翻译: 一种制备式(I)的β-内酰胺衍生物的方法:其中R 1表示氢或金属盐; 并且R 2表示氢,乙酰氧基甲基,(2,5-二氢-2-甲基-6-羟基-5-氧代 - 三嗪-3-基)硫代甲基或(1-甲基-1H-四唑-5-基) 噻吩基)硫代甲基。 该方法包括以下步骤:(a)使三苯基膦与六氯乙烷或四氯化碳与2-(2-氨基噻唑-4-基)-2-顺 - 甲氧基亚氨基乙酸在有机溶剂中反应,得到相应的式偕氯化鏻氯化物衍生物 (b)在不分离的情况下,用该酰氯氧氯化鏻衍生物酰化7-ACA的先前甲硅烷基化衍生物。