AZAINDOLIZINONE DERIVATIVES AND COGNITIVE ENHANCERS COMPRISING THE SAME AS EFECTIVE COMPONENTS

摘要

Azaindolizinone derivatives of general formula (I) or pharmaceutically acceptable salts thereof, wherein R1 is hydrogen, halogeno, or C1-C6 alkyl; R2 is hydrogen, C1-C6 alkyl, or the like; and R3 and R4 are each C1-C6 alkyl or - CH(R7)-R6 (wherein R6 is vinyl, ethynyl, phenyl, or the like; and R7 is hydrogen or C1-C6 alkyl), or alternatively R3 and R4may be united to form an indan or dihydrophenalene ring.