The present invention relates to compounds of formula (I) wherein n represents 0, 1, 2, 3, 4 or 5, R represents independent from each other hydroxyl, cyano, nitro, halogen, alkyl, alkoxy alkylcarbonyl, alkoxycarbonyl, alkylamine, dialkylamine, alkylcarbonylamine, alkylcarbamate Y represents one of the following groups: (Ia) in free base or acid addition salt form, to processes for their production, to pharmaceutical compositions comprising them and their use in the manufacture of a medicament for the treatment and/or delay of progression of psychotic and neurodegenerative disorders.