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    • 3. 发明授权
    • Method for preparing indole carboxylic acid derivatives
    • 吲哚羧酸衍生物的制备方法
    • US4965369A
    • 1990-10-23
    • US489895
    • 1990-03-07
    • Uwe MaetzelWalter Heitmann
    • Uwe MaetzelWalter Heitmann
    • C07D209/42C07D471/06C07D487/06C07D498/06C07D513/06
    • C07D471/06C07D209/42C07D513/06
    • A method of preparing indole carboxylic acid derivatives from aniline derivatives is described which can be carried out in a single reaction vessel without any isolation of intermediate products. The method involes reacting an aniline derivative with a soluble nitrite in an acid medium, reducing the resulting nitrosamine by treating the acidic nitrosamine containing reaction solution with zinc in the presence of sufficient acid, optionally with addition of additional acid and/or a solvent such as a lower alcohol, reacting the resulting hydrazine derivative containing solution with a lower alkyl ester of pyruvic acid to obtain a corresponding hydrazone which cyclizes to yield an indole carboxylic acid ester, and if desired, hydrolyzing the ester to obtain the corresponding carboxylic acid.
    • 描述了从苯胺衍生物制备吲哚羧酸衍生物的方法,其可以在单个反应容器中进行而不分离中间产物。 该方法使苯胺衍生物与可溶性亚硝酸盐在酸性介质中反应,通过在足够的酸存在下,用酸处理含酸性亚硝胺的反应溶液,任选地加入另外的酸和/或溶剂如 低级醇,使得到的含肼衍生物溶液与丙酮酸的低级烷基酯反应,得到相应的腙,其环化以产生吲哚羧酸酯,如果需要,水解该酯以获得相应的羧酸。