| abstract |
A compound of formula I where: - n is 1 or 2 - R1, R2 and R3 are independently hydrogen or (C1-4)alkyl and A is a group of formulae a) to h). With reference to a) to h): - m is 1, 2, or 3 - X is O, S, NH or CH2 - R4 and R5 are independently hydrogen, halogen, hydroxy, (C1-4)alkyl, (C1-4)alkoxy, (C1-4)alkylthio, (C1-4)alkylamino, nitro, trifluoromethyl or phenyl. A process for the preparation of a compound of formula I is also disclosed. A compound and also a pharmaceutically acceptable composition comprising a compound of formula I, may be used to treat psychotic and neurodegnerative disorders. |