NOVEL PYRIDAZINE DERIVATIVES AND DRUGS CONTAINING THE SAME AS THE ACTIVE INGREDIENT

摘要

This invention relates to pyridazine derivatives represented by the formula (1): <CHEM> wherein R<1> represents a lower alkoxyl group, a lower alkylthio group or a halogen atom; R<2> represents H, a lower alkoxyl group, a lower alkylthio group or a halogen atom; R<3> represents a lower alkyl or lower alkenyl group, which may be substituted by one or more OHs, CNs, lower cycloalkyl groups, (substituted) aromatic groups or (substituted) carbamoyl groups; R<4> represents COOH, a lower alkoxycarbonyl group, a (substituted) carbamoyl group, a (substituted) amino group, or a (substituted) ureido group; and the dashed line indicates that the carbon-carbon bond between the 4-position and the 5-position is a single bond or a double bond, or salts thereof; and also to medicines containing them as effective ingredients. These compounds have excellent inhibitory activity against interleukin-1 beta production, and are useful as preventives and therapeutics for immune system diseases, inflammatory diseases, ischemic diseases and the like.