申请人:Toyama Chemical Co., Ltd.
公开号:US05877174A1
公开(公告)日:1999-03-02
The present invention relates to a 2,3-diketopiperazine derivative or a salt thereof, which has inhibitory effect on platelet aggregation because of glycoprotein IIb/IIIa receptor antagonism and hence is useful as a prophylactic and therapeutic agent for diseases associated with platelet aggregation. General formula: ##STR1## wherein R.sup.1 represents a protected or unprotected amidino group; R.sup.2 represents a hydrogen atom or a carboxyl-protecting group; A represents a substituted or unsubstituted lower alkylene group; B represents --O--, --CONH--, --NHCO--or --SO.sub.2 NH--; Y represents a substituted or unsubstituted lower alkylene group; and the broken line represents a single bond or a double bond.
本发明涉及一种2,3-二酮哌嗪衍生物或其盐,由于糖蛋白IIb/IIIa受体拮抗作用具有抑制血小板聚集的效果,因此可用作预防和治疗与血小板聚集有关的疾病的药物。通式为:##STR1##其中R.sup.1表示保护或未保护的酰胺基团;R.sup.2表示氢原子或羧基保护基团;A表示取代或未取代的较低的烷基烷基链;B表示--O--,--CONH--,--NHCO--或--SO.sub.2NH--;Y表示取代或未取代的较低的烷基烷基链;而虚线表示单键或双键。