Process for the preparation of cephalosporin derivatives
    2.
    发明授权
    Process for the preparation of cephalosporin derivatives 失效
    头孢菌素衍生物的制备方法

    公开(公告)号:US4835267A

    公开(公告)日:1989-05-30

    申请号:US1875

    申请日:1987-01-09

    CPC分类号: C07D501/36 C07D501/32

    摘要: The present invention relates to an improved process for producing cephalosporin derivatives of formula (I), the 3-position of which being substituted by acetoxymethyl or tetrazolylthiomethyl and the 7-acyl group of which being substituted by D-mandelic acid derivatives, which comprises simultaneously reacting the compound of formula (III) with the compound of formula (IV) in the presence of a compound of formula (II) and anamine in high yield, ##STR1## wherein, R.sup.1 is hydrogen or ##STR2## R.sup.2 is methyl, ethyl, propyl or phenyl, X is ##STR3##

    摘要翻译: 本发明涉及一种制备式(I)的头孢菌素衍生物的改进方法,其3-位被乙酰氧基甲基或四唑基硫代甲基取代,其7-酰基被D-扁桃酸衍生物取代,其包括同时 在式(II)化合物和胺的存在下,以高产率使式(III)化合物与式(Ⅳ)化合物反应,其中式(Ⅳ)化合物与式 (IV)其中R1是氢或R2是甲基,乙基,丙基或苯基,X是

    7-(S)-Acylaminocephalosporin sulfones and process
    4.
    发明授权
    7-(S)-Acylaminocephalosporin sulfones and process 失效
    7-(S) - 氨基头孢菌素砜及方法

    公开(公告)号:US4477660A

    公开(公告)日:1984-10-16

    申请号:US442077

    申请日:1982-11-16

    申请人: David A. Hall

    发明人: David A. Hall

    CPC分类号: C07D501/04 C07D501/26

    摘要: This invention encompasses 7-(S)-acylamino-3-acetoxymethyl-3-cephem-4-carboxylic acid sulfones and the epimerization process for making them. The epimerization process employs an organic nitrogen base reagent having a pKa between about 9.0 to about 11.5. The compounds of this invention are intermediates in the synthesis of 1-oxa-.beta.-lactam antibiotics.

    摘要翻译: 本发明包括7-(S) - 酰基氨基-3-乙酰氧基甲基-3-头孢烯-4-羧酸砜和用于制备它们的差向异构化方法。 差向异构化方法使用pKa在约9.0至约11.5之间的有机氮碱试剂。 本发明的化合物是合成1-氧代-β-内酰胺抗生素的中间体。