Process for the preparation of 3-(substituted
phenyl)-5-alkylidene-1,3-oxazolidine-2,4-dione derivatives
    2.
    发明授权
    Process for the preparation of 3-(substituted phenyl)-5-alkylidene-1,3-oxazolidine-2,4-dione derivatives 失效
    3-(取代苯基)-5-亚烷基-1,3-恶唑烷-2,4-二酮衍生物的制备方法

    公开(公告)号:US6090946A

    公开(公告)日:2000-07-18

    申请号:US894655

    申请日:1997-12-15

    IPC分类号: C07C67/31 C07D263/44

    CPC分类号: C07D263/44 C07C67/31

    摘要: The present invention provides an industrial process for efficiently preparing a 3-(substituted phenyl)-5-isopropylidene-1,3-oxazolidine-2,4-dione derivative having a potent herbicidal activity without using phosgene or the like. The present invention relates to a process for preparing a 3-(substituted phenyl)-5-alkylidene-1,3-oxazolidine-2,4-dione derivative represented by general formula (III), which comprises reaction of an N-(substituted phenyl)carbamate represented by general formula (I) with a 2-hydroxy-3-alkenoate represented by-general formula (II) or with a 3-alkoxy-2-hydroxyalkanoate represented by general formula (IV): ##STR1## (wherein Ar is a substituted phenyl group, R.sup.1 is an alkyl group having a carbon number of from 1 to 6, R.sup.2 and R.sup.3 are independently hydrogen atoms or alkyl groups having carbon numbers of from 1 to 12, and R.sup.4 and R.sup.5 are independently alkyl groups having carbon numbers of from 1 to 6).

    摘要翻译: PCT No.PCT / JP96 / 00430 Sec。 371 1997年12月15日第 102(e)日期1997年12月15日PCT提交1996年2月26日PCT公布。 公开号WO96 / 26930 PCT。 日本1996年9月6日本发明提供了一种不使用光气等有效制备具有强效除草活性的3-(取代苯基)-5-异亚丙基-1,3-恶唑烷-2,4-二酮衍生物的工业方法 。 本发明涉及一种制备由通式(III)表示的3-(取代苯基)-5-亚烷基-1,3-恶唑烷-2,4-二酮衍生物的方法,该方法包括N-(取代的 苯基)氨基甲酸酯与由通式(II)表示的2-羟基-3-烯酸酯或由通式(IV)表示的3-烷氧基-2-羟基链烷酸酯反应:(其中Ar为 取代的苯基,R1是碳数为1至6的烷基,R2和R3独立地为氢原子或碳数为1至12的烷基,R4和R5独立地为碳数为 从1到6)。