The invention relates to cis-2,3,3a,4,5,9b-Hexahydro-1H-benzo[b]indole derivatives of the formula ##STR1## wherein R.sup.1 is a residue of the formula --O--CO--NR.sup.4 R.sup.5, R.sup.2 is lower alkyl, lower cycloalkyl or lower alkyl substituted by lower cycloalkyl, aryl, aroyl, aroylamino, amino or by a cyclic amino, amide or imide group, R.sup.3 is hydrogen or lower alkyl, R.sup.4 is lower alkyl and R.sup.5 is hydrogen or lower alkyl, the corresponding trans isomers or cis-trans isomeric mixtures and pharmaceutically acceptable salts thereof. These compounds and salts are especially suitable for the treatment or prophylaxis of cognitive disorders and senile dementia particularly, Alzheimer's disease, and for the improvement of memory capacity.
本发明涉及公式如下的cis-2,3,3a,4,5,9b-六
氢-1H-
苯并[b]
吲哚衍
生物:##
STR1## 其中R1为公式--O--CO--NR4R5的残基,R2为较低的烷基、较低的
环烷基或被较低的
环烷基、芳香族、芳香酰、芳香酰
氨基、
氨基或环状
氨基、
酰胺或
亚胺基取代的较低的烷基,R3为
氢或较低的烷基,R4为较低的烷基,R5为
氢或较低的烷基,相应的顺式异构体或顺反异构体混合物及其药学上可接受的盐。这些化合物和盐特别适用于治疗或预防认知障碍和老年性痴呆,特别是阿尔茨海默病,并提高记忆容量。