| 摘要 |
A compound of formula (I) wherein: A is (II), (III), (IV) or (V); X is O or S; Y is O or S; G and D are independently nitrogen or carbon with the proviso that no more than one of G, D, or E is nitrogen; E is N or C-R4; R1 is hydrogen or methyl; R2 is hydrogen or fluoro; R3 is hydrogen, halogen, C1 to C3 alkyl, -OR5, -CN, -CONH2, -CO2R5, -NR5R6 or phenyl optionally substituted with one to three of the following substituents: halogen, C1 to C3 alkyl, NO2, -CN, or -OCH3; R4 is hydrogen, halogen, C1 to C3 alkyl, -OR5, -CN, CONH2, -CO2R5, -NR5R6 or phenyl optionally substituted with one to three of the following substituents: halogen, C1 to C3 alkyl, -NO2, -CN, or -OCH3; or R2 and R3 or R3 and R4 may together represent a fused phenyl ring optionally substituted with one or two of the following substituents: halogen, C1 to C3 alkyl, -NO2, -CN, or -OCH3; R5 and R6 are independently hydrogen or C1 to C3 alkyl; or an enantiomer thereof, and pharmaceutically acceptable salts thereof, processes for preparing them, compositions containing them, and their use in therapy, especially in the treatment or prophylaxis of psychotic disorders and intellectual impairment disorders, as well as intermediates and use of intermediates in synthesis.
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