申请人:Takeda Chemical Industries, Ltd.
公开号:EP1184381A1
公开(公告)日:2002-03-06
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.
一种制备下式所代表的化合物或其盐的工艺,其特征在于将下式所代表的化合物
其中各符号如下文所定义,或其盐,其特征在于将下式所代表的化合物:
其中 R1 为引电子基团;R2、R3、R4、R5、R6 和 R7 各为氢原子、卤素原子、任选取代的氨基、任选取代的羟基、任选取代的硫醇基、任选取代的烃基或任选取代的杂环基,但 R6 和 R7 可结合成环;R8 为氢原子或任选取代的烃基或其盐,使其进行闭环反应。