1,3-disubstituted 4-(aryl-X-phenyl)-

1. A method for treating, ameliorating, or controlling a central nervous system disorder in a human, selected from the group consisting of anxiety disorders, psychotic disorders selected from the group consisting of schizophrenia, schizoaffective disorder and schizophreniform disorder, mood disorders, epilepsy or convulsive disorders, and dementia of the Alzheimer's type, wherein the method comprises administering to the human an effective amount of a compound having the formula (I)

or a stereochemically isomeric form thereof, wherein

R 1 is C 1-6 alkyl; or C 1-3 alkyl substituted with C 3-7 cycloalkyl, phenyl, or phenyl substituted with halo, trifluoromethyl or trifluoromethoxy;

R 2 is halo, trifluoromethyl, C 1-3 alkyl or cyclopropyl;

R 3 is hydrogen or halo;

X is O, S, SO, SO 2 , or CF 2 ; and

Ar is unsubstituted phenyl; unsubstituted pyridinyl; or phenyl or pyridinyl substituted with one or two substituents selected from the group consisting of halo, C 1-3 alkyl, C 1-3 alkoxy, trifluoromethyl, hydroxyC 1-3 alkyl and (CH 2 ) n —CO 2 H, wherein n=0, 1, or 2;

or a pharmaceutically acceptable salt thereof, provided that when R 3 is 2′-fluoro then Ar is not 3-pyridinyl substituted with one or two C 1-3 alkyl substituents.

2. The method according to claim 1 wherein

R 1 is 1-butyl, 2-methyl-1-propyl, 3-methyl-1-butyl, (cyclopropyl)methyl or 2-(cyclopropyl)-1-ethyl;

R 2 is chloro or trifluoromethyl;

R 3 is hydrogen, chloro or fluoro;

X is O; and

Ar is pyridinyl substituted with at least one methyl, or phenyl substituted with COOH or hydroxyC 1-3 alkyl;

or a pharmaceutically acceptable salt or a solvate thereof.

3. The method according to claim 1 wherein

R 1 is 1-butyl, 3-methyl-1-butyl, (cyclopropyl)methyl or 2-(cyclopropyl)-1-ethyl;

R 2 is chloro;

R 3 is chloro or fluoro;

X is O; and

Ar is 2-methylpyridin-4-yl, 2-methylpyridin-3-yl or 2,6-dimethylpyridin-4-yl,

or a pharmaceutically acceptable salt thereof.

4. The method according to claim 1 wherein said compound is selected from the group consisting of:

1-Butyl-3-chloro-4-[4-(2-methylpyridin-4-yloxy)-phenyl]-1H-pyridin-2-one

1-Butyl-3-chloro-4-[2-fluoro-4-(2-methylpyridin-4-yloxy)-phenyl]-1H-pyridin-2-one

3-Chloro-1-cyclopropylmethyl-4-[4-(2,6-dimethylpyridin-3-yloxy)-3-fluoro-phenyl]-1H-pyridin-2-one

4-[4-(1-Butyl-3-chloro-2-oxo-1,2-dihydro-pyridin-4-yl)-phenoxy]-benzoic acid

1-Cyclopropylmethyl-4-[4-(2,6-dimethyl-pyridin-4-yloxy)-3-fluoro-phenyl]-3-trifluoromethyl-1H-pyridin-2-one.

5. The method of claim 1 , wherein the central nervous system disorder is an anxiety disorder selected from the group consisting of agoraphobia, generalized anxiety disorder (GAD), obsessive-compulsive disorder (OCD), panic disorder, posttraumatic stress disorder (PTSD), social phobia and other phobias.

6. The method of claim 1 , wherein the central nervous system disorder is a psychotic disorder selected from the group consisting of schizophrenia, schizoaffective disorder, and schizophreniform disorder.

7. The method of claim 1 , wherein the central nervous system disorder is a mood disorder selected from the group consisting of bipolar disorders (I & II), cyclothymic disorder, depression, dysthymic disorder, major depressive disorder and substance-induced mood disorder.

8. The method of claim 1 , wherein the central nervous system disorder is epilepsy or a convulsive disorder selected from the group consisting of generalized nonconvulsive epilepsy, generalized convulsive epilepsy, petit mal status epilepticus, grand mal status epilepticus, partial epilepsy with or without impairment of consciousness, infantile spasms, epilepsy partialis continua, and other forms of epilepsy.

9. The method of claim 1 , wherein the central nervous system disorder is selected from the group consisting of anxiety, schizophrenia, depression, and epilepsy.

10. The method of claim 1 , further comprising administering an orthosteric agonist of mGluR2 in combination with the compound of formula (I).

11. The method of claim 1 , wherein the central nervous system disorder is dementia of the Alzheimer's type.

12. The method of claim 9 , wherein the central nervous system disorder is anxiety.

13. The method of claim 9 , wherein the central nervous system disorder is schizophrenia.

14. The method of claim 9 , wherein the central nervous system disorder is depression.

15. The method of claim 9 , wherein the central nervous system disorder is epilepsy.