This invention relates to a 4-quinolinone derivative represented by the following general formula (1):
wherein R1 and R2 mean individually H, halogen, cyano, or lower alkyl, lower alkylsulfonyl, lower alkylsulfinyl, lower alkylthio or lower alkoxy which may be substituted by halogen, or phenylsulfonyl, phenylsulfinyl or phenylthio which may have a substituent; and R3 and R4 denote individually H, lower alkyl or cycloalkyl which may be substituted by halogen, or pyridyl, furanyl or phenyl which may have a substituent, or R3 and R4 may form a 4-, 5- or 6-membered heterocyclic ring, or a salt thereof, and an intermediate useful for the preparation thereof, and besides a medicinal composition comprising this compound as an active ingredient. The compound (1) or the salt thereof has an excellent potassium channel-activating effect and is useful as, for example, a prophylactic and therapeutic agent for diseases of circulatory and bronchial systems.
本发明涉及一种由以下通式(1)表示的 4-
喹啉酮衍
生物:
其中 R1 和 R2 分别表示 H、卤素、
氰基或可被卤素取代的低级烷基、低级烷基磺酰基、低级烷基亚磺酰基、低级烷
硫基或低级烷氧基,或可具有取代基的苯磺酰基、苯亚磺酰基或苯
硫基;R3和R4分别表示H、可被卤素取代的低级烷基或环烷基,或可被取代基取代的
吡啶基、
呋喃基或苯基,或R3和R4可形成4、5或6元杂环,或其盐,以及可用于制备该化合物的中间体,此外还可制备包含该化合物作为活性成分的药物组合物。化合物(1)或其盐具有极佳的
钾通道激活效果,可用作循环系统和支气管系统疾病的预防和治疗药物。