Process for penems
    21.
    发明授权
    Process for penems 失效
    青春期的过程

    公开(公告)号:US5416208A

    公开(公告)日:1995-05-16

    申请号:US199963

    申请日:1994-02-22

    摘要: Antibacterial penems of formula (I), where R represents a hydrogen atom or a hydroxy protecting group, are prepared by reacting a .beta.-lactam of formula (II) with an oxalyl halide in an inert solvent in the presence of an organic or inorganic base or an acid scavenger to produce a compound of formula (III), wherein X is a halogen atom, treating the resultant compound of formula (III) with a 1,3-dioxolen-2-one of formula (IV), wherein Y is a hydroxy group, in the presence of molecular sieves or an organic or inorganic base to produce a compound of formula (V), and cyclizing the compound of formula (V) in the presence of a trialkylphosphite to provide the penems of formula (I).

    摘要翻译: 通过在有机或无机碱的存在下,在惰性溶剂中使式(II)的β-内酰胺与草酰卤反应来制备式(I)的抗菌青霉烯,其中R表示氢原子或羟基保护基 或酸清除剂,以制备其中X为卤素原子的式(III)化合物,用式(IV)的1,3-二氧戊环-2-酮处理所得的式(III)化合物,其中Y为 在分子筛或有机或无机碱存在下制备式(V)化合物的羟基,并且在亚烷基三烷基膦存在下使式(Ⅴ)化合物环化以提供式(I)的pen) 。