Preparation of 2-substituted pyridines
    3.
    发明公开
    Preparation of 2-substituted pyridines 有权
    Verfahren zur Herstellung von 2-substitutionierten Pyridinen

    公开(公告)号:EP0955291A1

    公开(公告)日:1999-11-10

    申请号:EP99303341.4

    申请日:1999-04-28

    IPC分类号: C07D213/61

    摘要: This invention relates to a process for preparing 2-substituted pyridines via metal halogen exchange with sec-butyllithium on optionally substituted 2-bromo or 2-iodopyridines. The resulting lithopyridine intermediate is reacted with an electrophile to provide the desired 2-substituted pyridine. The substitution of sec-butyllithium for n-butyllithium in such a process results in an enhanced yield and purity of the desired 2-substituted pyridine.

    摘要翻译: 本发明涉及通过任选取代的2-溴或2-碘吡啶与仲丁基锂的金属卤素交换制备2-取代的吡啶的方法。 将所得的litttyridine中间体与亲电试剂反应以提供所需的2-取代的吡啶。 在这种方法中,仲丁基锂代替正丁基锂导致所需2-取代吡啶的产率和纯度提高。

    Process for preparing 1,2-diacyl-2-t-alkylhydrazides
    6.
    发明公开
    Process for preparing 1,2-diacyl-2-t-alkylhydrazides 失效
    Verfahren zur Herstellung von 1,2-Diacyl-2-t-alkylhydroziden。

    公开(公告)号:EP0638545A1

    公开(公告)日:1995-02-15

    申请号:EP94305506.1

    申请日:1994-07-26

    IPC分类号: C07C241/04 C07C243/38

    CPC分类号: C07C241/04 C07C243/38

    摘要: A selective process is provided for preparing a hydrazide by reacting an aromatic anhydride with a tertiary alkyl hydrazine and then reacting the resultant acyl hydrazide with an aromatic acid chloride.

    摘要翻译: 提供了通过使芳族酸酐与叔烷基肼反应制备酰肼,然后使所得酰基酰肼与芳族酰氯反应的选择性方法。

    Synthesis of N-t-alkyl-1,2-diacylhydrazines
    10.
    发明公开
    Synthesis of N-t-alkyl-1,2-diacylhydrazines 失效
    合成N-叔 - 烷基-1,2-二酰肼。

    公开(公告)号:EP0339854A2

    公开(公告)日:1989-11-02

    申请号:EP89303845.5

    申请日:1989-04-18

    CPC分类号: C07C241/04 C07C243/38

    摘要: A process for preparing a N- t -alkyl-1,2-diacylhydrazine comprises reacting a 1, 3, 4-oxadiazole with a tertiary alkyl cation precursor in the presence of a strong acid catalyst.

    摘要翻译: 制备N-叔 - 烷基-1,2-二酰基肼的方法包括在强酸催化剂存在下使1,3,4-恶二唑与叔烷基阳离子前体反应。