申请人:Takeda Chemical Industries, Ltd.
公开号:US06566535B1
公开(公告)日:2003-05-20
A process for preparing a compound represented by the following formula:
wherein each symbol is as defined below, or a salt thereof, characterized by subjecting a compound represented by the following formula:
wherein R1 is an electron-attracting group; R2, R3, R4, R5, R6 and R7 are each a hydrogen atom, a halogen atom, an optionally substituted amino group, an optionally substituted hydroxyl group, an optionally substituted thiol group, an optionally substituted hydrocarbon group, or an optionally substituted heterocyclic group, provided that R6 and R7 may be united to form a ring; and R8 is a hydrogen atom or an optionally substituted hydrocarbon group, or a salt thereof, to a ring-closing reaction.
一种制备下述化合物或其盐的方法,所述化合物由以下公式表示:其中每个符号定义如下,其特征在于将以下公式表示的化合物:其中R1是一个电子吸引基团;R2、R3、R4、R5、R6和R7分别是氢原子、卤原子、可选择取代的氨基团、可选择取代的羟基团、可选择取代的硫基团、可选择取代的碳氢基团或可选择取代的杂环基团,但R6和R7可以结合形成一个环;以及R8是氢原子或可选择取代的碳氢基团,或其盐,进行环闭合反应。