| abstract |
The present invention relates to compounds of general formula (I) wherein X is a single bond or an ethynediyl group, wherein, in case X is a single bond, R<1> is halogen or phenyl which is optionally substituted with halogen, lower alkyl, halo-lower alkyl, lower alkoxy, halo-lower alkoxy, or cyano; In case X is an ethynediyl group, R<1> is phenyl, optionally substituted with halogen, lower alkyl, halo-lower alkyl, lower cycloalkyl, lower alkoxy or halo-lower alkoxy; R<3> is a 5 or 6 membered aryl or heteroaryl which are optionally substituted. The compounds according to the present invention can be used for treating or preventing acute and/or chronic neurological disorders such as psychosis, schizophrenia, Alzheimer's disease, cognitive disorders and memory deficits. |