PYRIDAZINONE DERIVATIVES AND PROCESSES FOR PREPARING THE SAME

摘要

Disclosed is a pyridazinone compound represented by the formula (I): <IMG> (I) wherein X represents hydrogen atom or the like; Y represents a single bonding arm, oxygen atom or sulfur atom; A represents a straight or branched alkylene group which may have a double bond; B represents carbonyl group or thiocarbonyl group; and R carbon atoms which may be substituted or the like; or B represents sulfonyl group; and R lower alkenyl group or the like; R1 represents hydrogen atom or the like; R3 represents hydrogen atom or the like; R4 represents hydrogen atom or the like; and R5 represents hydrogen atom or the like, or a pharmaceutically acceptable salt thereof.