| 摘要 |
Compounds of Structure (1) …<CHEM>… in which… R<1> is H, C1-5 alkyl (straight or branched), or a phenyl or benzyl group optionally substituted by C1-5 alkyl (straight or branched), C1-4 alkoxy (straight or branched) or hydroxy;… R<2> is H, OH, C1-5 alkyl (straight or branched), aryl or acyl;… R<3> is H, C1-5 alkyl (straight or branched) or phenyl and R<4> is C1-5 alkyl (straight or branched) or phenyl, or R<3> and R<4> can together form a 1,4-butylene or 1,5-pentylene group;… R<5> is H or C1-5 alkyl (straight or branched);… R<6> is H, C1-5 alkyl (straight or branched), -CHR<8>CONH2 or -CHR<8>CONHCHR<9>CONH2; where R<8> and R<9> (which can be the same or different) are H or C1-5 alkyl (straight or branched);… and… R<7> is H or C1-5 alkyl (straight or branched),… and pharmaceutically acceptable salts thereof, processes and intermediates for making them, pharmaceutical compositions containing them and their use as nootropic agents. |
