PyrazoloÝ1,5-a¨pyrimidine derivatives

摘要

The present invention provides pyrazolo 1,5-a­pyrimidine derivatives represented by the formula (1) wherein R<1> represents lower alkyl or the like; one of R<2> and R<3> represents hydrogen and the other represents phenyl having lower alkoxy or the like, and R<4> 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.