| 摘要 |
Compounds of the formula <CHEM> in which R<1> is hydrogen, hydroxy, nitro, cyano, halo, amino, acetamido, hydroxy-C1-4 alkyl, carboxaldehydo, C1-4 alkylcarbonyl, carboxy, C1-4 alkoxy-carbonyl, C1-4 alkyl, C1-4 alkoxy, C1-4 alkylthio, C1-4 alkylsulphonyl or C1-4 alkoxy-C1-4 alkyl, R<2> is hydrogen, hydroxy, nitro, cyano, halo, amino, carboxamido, acetamido, hydroxy-C1-4alkyl, carboxaldehydo, C1-4 alkylcarbonyl, carboxy, C1-4 alkoxycarbonyl, C1-4 alkyl, C1-4 alkoxy, C1-4 alkylthio, C1-4 alkylsulphonyl, C1-4 alkoxy-C1-4 alkyl, oximino or aminomethyl, R<3> is optionally substituted phenyl or optionally substituted phenyl ortho condensed with an optionally substituted ring selected from benzene, cyclohexane, cyclohexene, cyclopentane or cyclopentene, in which ring one of the carbon atoms may be replaced by oxygen, sulphur or nitrogen, and R<4> is hydrogen, C1-4 alkyl, C2-4 alkenyl or optionally substituted benzyl; and salts thereof; have central nervous system activity. |
