Azaindolizinone derivatives and cerebral function improvers containing the same as the active ingredient

摘要

Azaindolizinon derivatives or pharmaceutically acceptable salts thereof represented by the formula I: wherein R1 represents hydrogen atom, halogen atom or C1-C6 alkyl, R2 represents hydrogen atom, C1-C6 alkyl, C1-C6alkoxy, hydroxy, halogen atom, amino, acetylamino, benzylamino, trifluoromethyl or -O-(CH2)n-R5 (R5 represents vinyl, C3-C8 cycloalkyl or phenyl, n being 0 or 1), R3 and R4 respectively represent C1-C6 alkyl or -CH(R7)-R6 (wherein R6 represents vinyl, ethynyl, phenyl (which may be substituted with C1-C6 alkyl, C1-C6 alkoxy, hydroxy, one or two halogen atoms, di C1-C6 alkylamino, cyano, nitro, carboxy or phenyl), phenethyl, pyridyl, thienyl or furyl and R7 represents hydrogen atom or C1-C6 alkyl) or R3 is coupled with R4 to form indan or dihydrophenalene.