5-PHENYL-3-PYRIDAZINONE DERIVATIVES AND DRUG COMPOSITIONS CONTAINING THE SAME

摘要

5-Phenyl-3-pyridazinone derivatives represented by general formula (I) where in R1 is optionally substituted C1-C8 alkyl, C3-C7 cycloalkyl, or indanyl; R2 i s C1-C4 alkyl; R3 is hydrogen, optionally substituted C1-C5 alkyl, C3-C7 cycloalkyl or aryl optionally containing a hetero atom; R4 and R5 are each independently hydrogen, C1-C6 alkyl, optionally substituted phenyl, or monocyclic aryl containing a hetero atom; and the broken line refers to a single or double bond, with the proviso that when the line refers to the former, R6 is hydrogen or C1-C6 alkyl.