The present invention provides pyrazolo[1,5-a]pyrimidine derivatives represented by the formula (1)
wherein R1 represents lower alkyl or the like; one of R2 and R3 represents hydrogen and the other represents phenyl having lower alkoxy or the like, and R4 is hydrogen, carboxyl, lower alkoxy-carbonyl or the like. The derivatives of the invention have pharmacological effects such as analgesic action, inhibitory effect on nitrogen monoxide synthetase and the like and are useful as analgesics. The derivatives of the invention are also useful as therapeutic or prophylactic agents for septicemia, endotoxin shock, chronic articular rheumatism, etc.
本发明提供由式(1)表示的
吡唑并[1,5-a]
嘧啶衍
生物
其中 R1 代表低级烷基或类似物;R2 和 R3 中的一个代表
氢,另一个代表具有低级烷
氧基或类似物的
苯基,R4 是
氢、羧基、低级烷
氧基-羰基或类似物。本发明的衍
生物具有镇痛作用、
一氧化氮合成酶抑制作用等药理作用,可用作镇痛剂。本发明的衍
生物还可作为治疗或预防败血症、内毒素休克、慢性关节风湿病等的药物。