Process for the preparation of 3-substituted thiophenes
    3.
    发明授权
    Process for the preparation of 3-substituted thiophenes 失效
    3-取代噻吩的制备方法

    公开(公告)号:US5512685A

    公开(公告)日:1996-04-30

    申请号:US244379

    申请日:1994-12-20

    CPC分类号: C07D333/08

    摘要: The invention relates to a process for the preparation of 3-substituted thiophenes in which the substituent is a C.sub.4 -C.sub.18 -alkyl group. According to the invention, the preparation is carried out by allowing an alkali metal salt of a C.sub.4 -C.sub.18 -alkyl-succinic acid to react with a compound of sulfur and phosphorus, e.g. tetraphosphorus decasulfide, in an organic solvent at a temperature of 100.degree.-180.degree. C., the product obtained being 3-(C.sub.4 -C.sub.18 -alkyl)thiophene. The said reaction may be the last step in a process in which the initial material is maleic acid anhydride with which .alpha.-C.sub.4 -C.sub.18 -alkene is combined so that C.sub.4 -C.sub.18 -alkenylsuccinic acid anhydride is obtained, whereafter this is hydrogenated catalytically to produce C.sub.4 -C.sub.18 -alkylsuccinic acid anhydride. This is thereafter reacted with an alkali metal hydroxide so that an alkali salt of the C.sub.4 -C.sub.18 -alkylsuccinic acid is obtained, which salt is reacted with a compound of sulfur and phosphorus to produce 3-(C.sub.4 -C.sub.18 -alkyl)thiophene, which constitutes the final product.

    摘要翻译: PCT No.PCT / FI92 / 00333 Sec。 371日期1994年12月20日第 102(e)日期1994年12月20日PCT提交1992年12月8日PCT公布。 出版物WO93 / 12106 日期:1993年6月24日。本发明涉及一种制备3-取代噻吩的方法,其中取代基是C4-C18-烷基。 根据本发明,通过使C4-C18-烷基 - 琥珀酸的碱金属盐与硫和磷的化合物反应来进行制备。 十四硫化四磷,在有机溶剂中,在100-180℃的温度下,得到的产物是3-(C 4 -C 18 - 烷基)噻吩。 所述反应可以是其中初始材料是马来酸酐与其中α-C 4 -C 18 - 烯烃组合使得得到C 4 -C 18 - 烯基琥珀酸酐的方法中的最后一个步骤,然后将其氢化催化以产生 C4-C18-烷基琥珀酸酐。 然后与碱金属氢氧化物反应,得到C4-C18-烷基琥珀酸的碱金属盐,该盐与硫和磷的化合物反应生成3-(C 4 -C 18烷基)噻吩,其中 构成最终产品。