申请人:MEIJI SEIKA KAISHA LTD.
公开号:EP0806419A1
公开(公告)日:1997-11-12
This invention provides a serotonin 5-HT3 receptor partial activator which has a serotonin 5-HT3 receptor activating action, in addition to its serotonin 5-HT3 receptor antagonism, and does not cause constipation as a side effect.
Particularly, based on the finding that newly synthesized benzoxazole derivatives typified by the compounds of the following formula (2) have strong serotonin 5-HT3 receptor antagonism and serotonin 5-HT3 receptor activating action, this invention provides these benzoxazole derivatives as serotonin 5-HT3 receptor partial activators.
In the above formula, R1 to R4 may be the same or different from one another and each represents a hydrogen atom, a halogen atom, a substituted or unsubstituted lower alkyl group, a substituted or unsubstituted lower alkenyl group or a substituted or unsubstituted amino group, or two groups of R1 and R2 may be linked together to form a ring structure, namely benzene ring; R5 represents a hydrogen atom, a substituted or unsubstituted lower alkyl group or a substituted or unsubstituted lower alkenyl group; and m is an integer of 1 to 4.
本发明提供了一种5-羟色胺5-HT3受体部分激活剂,它除了具有5-羟色胺5-HT3受体拮抗作用外,还具有5-羟色胺5-HT3受体激活作用,并且不会引起便秘副作用。
特别是,基于新合成的以下式(2)化合物为典型代表的苯并恶唑衍生物具有很强的血清素 5-HT3 受体拮抗作用和血清素 5-HT3 受体激活作用,本发明提供了这些苯并恶唑衍生物作为血清素 5-HT3 受体部分激活剂。
上式中,R1~R4可以相同或互不相同,各自代表氢原子、卤素原子、取代或未取代的低级烷基、取代或未取代的低级烯基或取代或未取代的氨基,也可以将R1和R2的两个基团连接在一起形成环状结构,即苯环;R5代表氢原子、取代或未取代的低级烷基或取代或未取代的低级烯基;m为1~4的整数。