Process for preparing 4-acetoxy-3-hydroxyethylazetidin-2-one derivatives
    21.
    发明授权
    Process for preparing 4-acetoxy-3-hydroxyethylazetidin-2-one derivatives 失效
    4-乙酰氧基-3-羟乙基氮杂环丁-2-酮衍生物的制备方法

    公开(公告)号:US4861877A

    公开(公告)日:1989-08-29

    申请号:US809

    申请日:1987-01-06

    IPC分类号: C07D205/08 C07F7/18

    摘要: A process for preparing a 4-acetoxy-3-hydroxyethylazetidin-2-one derivative having the formula (II): ##STR1## wherein R.sup.1 is a protective group for the hydroxyl group, which comprises reacting a .beta.-lactam compound having the formula (I): ##STR2## wherein R.sup.1 is as defined above, R.sup.2, R.sup.3 and R.sup.4 are a lower alkyl group having 1 to 6 carbon atoms, phenyl group or an aralkyl group and R is a protective group for N, with acetic anhydride in an organic solvent in the presence of a base, and removing the protective group for N.4-Acetoxy-3-hydroxyethylazetidin-2-one derivatives are useful intermediates for preparing carbapenem .beta.-lactam antibiotics such as thienamycin and penem .alpha.-lactam antibiotics.

    摘要翻译: 制备具有式(II)的4-乙酰氧基-3-羟乙基氮杂环丁-2-酮衍生物的方法:其中R1是羟基的保护基,其包括使具有 式(I):其中R 1如上定义,其中R 1,R 3和R 4为具有1至6个碳原子的低级烷基,苯基或芳烷基,R为N的保护基 在乙酸酐的存在下,在有机溶剂中,在碱的存在下,除去N-(4-乙酰氧基-3-羟乙基氮杂环丁烷-2-酮)衍生物的保护基是制备碳青霉烯类β-内酰胺抗生素如噻吩霉素和青霉素的有用中间体 α-内酰胺抗生素。