IMPROVED PROCESS FOR THE KUMADA COUPLING REACTION
    4.
    发明授权
    IMPROVED PROCESS FOR THE KUMADA COUPLING REACTION 有权
    改进方法,熊田偶联反应

    公开(公告)号:EP1836184B1

    公开(公告)日:2008-06-04

    申请号:EP05855436.1

    申请日:2005-12-22

    IPC分类号: C07D333/06

    CPC分类号: C07D333/06

    摘要: A method for the formation of 3-alkylthiophenes or 3-arylthiophenes from 3--halothiophenes. More particularly, improvements on the Kumada coupling reaction for the production of 3-alkylthiophenes or 3- arylthiophenes by reacting a 3-hâlothiophene with an alkylmagnesiumhalide or arylmagnesiumhalide Grignard reagent in the presence of a catalyst and a 2-methyl tetrahydrofuran solvent. The 2-methyl tetrahydrofuran solvent allows for higher concentrations of the Grignard reagent with minimal or no dithienyl side product generation, achieving higher product yields and at a lower cost than other known methods.

    PROCESS FOR ISOMERIZATION OF 2-HALOTHIOPHENE TO-3-HALOTHIOPHENE
    5.
    发明公开
    PROCESS FOR ISOMERIZATION OF 2-HALOTHIOPHENE TO-3-HALOTHIOPHENE 审中-公开
    2-卤代苯对3-卤代苯并异构化的方法

    公开(公告)号:EP1836186A1

    公开(公告)日:2007-09-26

    申请号:EP05855005.4

    申请日:2005-12-21

    IPC分类号: C07D333/28

    CPC分类号: C07D333/28

    摘要: An improved process and catalyst system for the isomerization of halothiophenes. More particularly, an improved process for the isomerization of 2-halothiophenes to 3-halothiopenes by reacting a w-halothiophene with a catalyst and in the presence of a base. The addition of a base additive to the acidic zeolite catalyst allows the desired isomerization to take place while suppressing side-reactions that result in the decomposition of the thiophene rings. The catalyst lifetime is thus increased and the amount of catalyst needed for the reaction is reduced, lowering cost.

    摘要翻译: 用于卤代噻吩异构化的改进方法和催化剂体系。 更具体地说,是一种改进的2-卤代噻吩异构化为3-卤代硫代环戊烯的方法,该方法是使一种间卤代噻吩与一种催化剂反应并在碱存在下反应。 向酸性沸石催化剂中添加碱添加剂可以实现所需的异构化反应,同时抑制导致噻吩环分解的副反应。 催化剂寿命因此增加并且反应所需的催化剂量减少,从而降低了成本。

    IMPROVED PROCESS FOR THE KUMADA COUPLING REACTION
    8.
    发明公开
    IMPROVED PROCESS FOR THE KUMADA COUPLING REACTION 有权
    改进方法,熊田偶联反应

    公开(公告)号:EP1836184A1

    公开(公告)日:2007-09-26

    申请号:EP05855436.1

    申请日:2005-12-22

    IPC分类号: C07D333/06

    CPC分类号: C07D333/06

    摘要: A method for the formation of 3-alkylthiophenes or 3-arylthiophenes from 3--halothiophenes. More particularly, improvements on the Kumada coupling reaction for the production of 3-alkylthiophenes or 3- arylthiophenes by reacting a 3-hâlothiophene with an alkylmagnesiumhalide or arylmagnesiumhalide Grignard reagent in the presence of a catalyst and a 2-methyl tetrahydrofuran solvent. The 2-methyl tetrahydrofuran solvent allows for higher concentrations of the Grignard reagent with minimal or no dithienyl side product generation, achieving higher product yields and at a lower cost than other known methods.