Pyridazinone derivatives of formula (I):
wherein R¹ represents a hydrogen atom or a methyl group which may be substituted with an aliphatic cyclic amino group optionally containing a hetero atom in the ring thereof; each of X¹ and X² independently represents a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a cyano group, a nitro group or a group shown by - CO-NR²R³ (wherein each of R² and R³ independently represents an alkyl group having 1 to 6 carbon atoms); Y represents a halogen atom; Z represents an alkoxy group having 1 to 6 carbon atoms; ℓ represents 0 or an integer of 1 to 3; A represents CH or N; m represents 0 or an integer of 1 or 2; and n represents an integer of 1 to 8, exhibit a platelet aggregation inhibiting activity and are useful for the treatment of circulatory disorders such as cerebral infarction.
式 (I) 的
哒嗪酮衍
生物:
其中 R¹ 代表氢原子或可被脂族环状
氨基取代的甲基,环中可选择含有一个杂原子;X¹ 和 X² 各自独立地代表氢原子、卤素原子、具有 1 至 6 个碳原子的烷基、具有 1 至 6 个碳原子的烷氧基、
氰基、硝基或 - CO-NR²R³ 所示的基团(其中 R² 和 R³ 各自独立地代表具有 1 至 6 个碳原子的烷基);Y 代表卤素原子;Z 代表具有 1 至 6 个碳原子的烷氧基;ℓ 代表 0 或 1 至 3 的整数;A 代表 CH 或 N;m 代表 0 或 1 或 2 的整数;n 代表 1 至 8 的整数,具有血小板聚集抑制活性,可用于治疗循环系统疾病,如脑梗塞。