Piperazine compounds of the formula:
wherein R' is aryl;
ar(lower)alkyl which may have lower alkoxy; or
heterocyclic(lower)alkyl which may have substituent(s) selected from the group of lower
alkyl and aryl on the heterocyclic ring;
R2 is lower alkyl;
higher alkyl;
lower alkylthio(lower)alkyl;
lower alkenylthio(lower)alkyl;
hydroxy(lower)alkyl;
protected hydroxy(lower)alkyl;
amino(lower)alkyl;
protected amino(lower) alkyl;
carboxy(lower)alkyl;
protected carboxy(lower)alkyl;
arylthio(lower)alkyl;
ar(lower)alkylthio(lower)alkyl; or heterocyclic-(lower)alkyl which may have lower alkyl on the heterocyclic ring; and
R3 and R4 are each hydrogen or lower alkyl, or pharmaceutically acceptable salt thereof.
Processes for the preparation of these piperazine compounds are also described, together with pharmaceutical compositions comprising them.
The compounds are PAF (Platelet Activating Factor)antagonists and are therefore useful in the prevention and treatment of diseases caused by PAF, such as asthma, thrombosis and nephritis.
式中的
哌嗪化合物:
其中 R' 为芳基;
可带有低级烷氧基的芳基(低级)烷基;或
杂环(低级)烷基,可在杂环上具有选自低级烷基和芳基的取代基;或
或杂环(低级)烷基,其杂环上可有选自低级烷基和芳基的取代基;
R2 是低级烷基
高烷基
低级烷
硫基(低级)烷基
低级烯
硫基(低级)烷基
羟基(低级)烷基
受保护的羟基(低级)烷基
氨基(低级)烷基
受保护的
氨基(低级)烷基
羧基(低级)烷基
受保护的羧基(低级)烷基;
芳
硫基(低级)烷基;
芳
硫基(低级)烷基;或杂环-(低级)烷基,杂环上可能有低级烷基;以及
R3 和 R4 分别为氢或低级烷基,或其药学上可接受的盐。
本文还描述了制备这些
哌嗪化合物的工艺以及包含这些化合物的药物组合物。
这些化合物是 PAF(血小板活化因子)拮抗剂,因此可用于预防和治疗由 PAF 引起的疾病,如哮喘、血栓和肾炎。