申请人:TSUMURA & CO.
公开号:EP0269754A1
公开(公告)日:1988-06-08
Biphenyl derivatives represented by formula (I), process for their preparation, liver trouble-relieving agents containing the derivatives as effective ingredients, and intermediates represented by formula (II) for preparing the derivatives. The compounds of the formula (I) are prepared by reacting an alkyl gallate with a methylating agent, halogenating the product, mono-dehalogenating the product to prepare the intermediate (II), methylating it, coupling the product according to the Ullmann reaction, and reacting the product with lead tetraacetate, wherein R, and R2 each represents H or CH3, and X represents a halogen atom.
由式(I)表示的联苯衍生物,其制备工艺,含有该衍生物作为有效成分的肝脏问题缓解剂,以及由式(II)表示的用于制备该衍生物的中间体。式(I)化合物的制备方法是:将没食子酸烷基酯与甲基化剂反应,卤化产物,单脱卤制备中间体(II),将其甲基化,根据乌尔曼反应偶联产物,并使产物与四乙酸铅反应,其中R和R2分别代表H或CH3,X代表卤素原子。