Piperazine and Piperidine MGLUR5 Potentiators

1 . A compound of Formula:

wherein:

Ar 1 is selected from the group consisting of aryl and heteroaryl, substituted with a CN group at the position alpha to the link with group B, further optionally-substituted with one or more substituents selected from the group consisting of alkyl, haloalkyl and halo;

Ar 2 is selected from the group consisting of aryl and heteroaryl, optionally substituted with one or more substituents selected from the group consisting of halo, alkyl, haloalkyl, alkoxy, haloalkoxy, NR 5 R 6 , O-alkylene-aryl, O-alkylene-heteroaryl, O-alkylene-O-alkyl, O-cycloalkyl, O-heterocycloalkyl, wherein any cyclic group may be further substituted with one or more substituents selected from the group consisting of alkyl and halo;

A is selected from the group consisting of C and N;

B is a bond when A is N and is group NR when A is C;

D is selected from the group consisting of NR 1 and O;

a is selected from the group consisting of 0 and 1;

m is selected from the group consisting of 1 and 2;

n is selected from the group consisting of 1, 2, 3 and 4;

R, R 2 , R 3 , R 5 and R 6 are independently selected from the group consisting of H and alkyl;

R 1 is selected from the group consisting of H, alkyl, COR, CO 2 R and SO 2 R; and

R 4 is selected from the group consisting of H, halo, CN, alkyl, haloalkyl, CH 2 OR and CO 2 R,

or a pharmaceutically acceptable salt, hydrate, solvate, optical isomer, or combination thereof.

2 . A compound according to claim 1 wherein A is N and B is a bond, or a pharmaceutically acceptable salt thereof, or a hydrate thereof, or a solvate thereof, or an optical isomer thereof.

3 . A compound according to claim 2 wherein a is 0, or a pharmaceutically acceptable salt thereof, or a hydrate thereof, or a solvate thereof, or an optical isomer thereof.

4 . A compound according to claim 3 wherein m is 1, or a pharmaceutically acceptable salt thereof, or a hydrate thereof, or a solvate thereof, or an optical isomer thereof.

5 . A compound according to claim 4 wherein Ar 1 is selected from the group consisting of phenyl, pyridyl and pyrazinyl, or a pharmaceutically acceptable salt thereof, or a hydrate thereof, or a solvate thereof, or an optical isomer thereof.

6 . A compound according to claim 4 wherein Ar 2 is selected from the group consisting of phenyl and pyridyl, or a pharmaceutically acceptable salt thereof, or a hydrate thereof, or a solvate thereof, or an optical isomer thereof.

7 . A compound selected from the group consisting of:

2-{4-[2-(4-Butoxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Butoxy-phenyl)-acetyl]-piperazin-1-yl}-benzonitrile;

4-[2-(4-Butoxy-phenyl)-acetyl]-3,4,5,6-tetrahydro-2H-[1,2]bipyrazinyl-3′-carbonitrile;

2-{4-[2-(4-Hydroxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Ethoxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Butoxy-phenyl)-acetyl]-[1,4]diazepan-1-yl}-nicotinonitrile;

2-(4-Butoxy-phenyl)-1-[4-(3-chloro-pyridin-2-yl)-piperazin-1-yl]-ethanone;

2-{4-[2-(4-Isopropoxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-(4-{2-[(4-Bromo-phenyl)-methyl-amino]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-{4-[2-(Methyl-p-tolyl-amino)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Phenoxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-[4-(2-Phenoxy-acetyl)-piperazin-1-yl]-nicotinonitrile;

2-{4-[2-(4-Butyl-phenoxy)-acetyl]-piperazin-1-yl}-nicotinonitrile;

3-{4-[2-(4-Butoxy-phenyl)-acetyl]-piperazin-1-yl}-pyridine-2-carbonitrile;

2-{4-[2-(4-Benzyloxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Propoxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-(4-{2-[4-(Tetrahydro-furan-3-yloxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-{4-[2-(4-Nitro-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-(4-{2-[4-(2-Methoxy-ethoxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-{4-[2-(4-Phenethyloxy-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

3-{4-[2-(4-Butoxy-phenyl)-acetyl]-piperazin-1-yl}-isonicotinonitrile;

2-{4-[2-(4-Butoxy-phenyl)-acetyl]-piperazin-1-yl}-6-trifluoromethyl-nicotinonitrile;

2-{4-[2-(6-Chloro-pyridin-3-yl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{1-[2-(4-Butoxy-phenyl)-acetyl]-piperidin-4-ylamino}-nicotinonitrile;

2-({1-[2-(4-Butoxy-phenyl)-acetyl]-piperidin-4-yl}-methyl-amino)-nicotinonitrile;

2-(4-Butoxy-phenyl)-1-[4-(3-ethylamino-pyridin-2-yl)-piperazin-1-yl]-ethanone;

2-{4-[2-(5-Butoxy-pyridin-2-yl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Butylamino-phenyl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Butyl-phenylamino)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-(4-{2-[4-(Butyl-methyl-amino)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[(4-Butyl-phenyl)-methyl-amino]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[(6-Butoxy-pyridin-3-yl)-methyl-amino]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[4-(Pyridin-4-ylmethoxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-{4-[2-(6-Butoxy-pyridin-3-ylamino)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(6-Butoxy-pyridin-3-yl)-acetyl]-piperazin-1-yl}-nicotinonitrile;

2-{4-[2-(4-Butoxy-phenylamino)-acetyl]-piperazin-1-yl}-nicotinonitrile;

4-{2-[(4-Butyl-phenyl)-methyl-amino]-acetyl}-3,4,5,6-tetrahydro-2H-[1,2]bipyrazinyl-3′-carbonitrile;

2-((R)-4-{2-[(4-Butyl-phenyl)-methyl-amino]-acetyl}-3-methyl-piperazin-1-yl)-nicotinonitrile;

2-((S)-4-{2-[(4-Butyl-phenyl)-methyl-amino]-acetyl}-3-methyl-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[(4-Butyl-phenyl)-methyl-amino]-acetyl}-2-methyl-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[(4-Butyl-phenyl)-methyl-amino]-acetyl}-[1,4]diazepan-1-yl)-nicotinonitrile;

2-(4-{2-[(4-Butyl-phenyl)-methyl-amino]-propionyl}-piperazin-1-yl)-nicotinonitrile;

N-(4-Butyl-phenyl)-N-{2-[4-(3-cyano-pyridin-2-yl)-piperazin-1-yl]-2-oxo-ethyl}-methanesulfonamide;

N-(4-Butyl-phenyl)-N-[2-(3′-cyano-2,3,5,6-tetrahydro-[1,2]bipyrazinyl-4-yl)-2-oxo-ethyl]-methanesulfonamide;

2-(4-{2-[4-(Pyridin-2-ylmethoxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[4-(Pyridin-3-ylmethoxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[4-(Thiazol-2-ylmethoxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile;

2-(4-{2-[4-(4-Methyl-thiazol-2-ylmethoxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile, and

2-(4-{2-[4-(Thiazol-5-ylmethoxy)-phenyl]-acetyl}-piperazin-1-yl)-nicotinonitrile

or a pharmaceutically acceptable salt, hydrate, solvate or optical isomer, of any foregoing compound.

8 . A pharmaceutical composition comprising a compound, or a pharmaceutically acceptable salt thereof, or a hydrate thereof, or a solvate thereof, or an optical isomer thereof, according to claim 1 and a pharmaceutically acceptable carrier or excipient.

9 - 11 . (canceled)

12 . A method for the treatment or prevention of neurological and psychiatric disorders associated with glutamate dysfunction in an animal in need of such treatment, comprising the step of administering to said animal a therapeutically effective amount of a compound, or a pharmaceutically acceptable salt thereof, or a hydrate thereof, or a solvate thereof, or an optical isomer thereof, according to claim 1 .

13 . A method for the treatment or prevention of neurological and psychiatric disorders associated with glutamate dysfunction in an animal in need of such treatment, comprising the step of administering to said animal a therapeutically effective amount of a pharmaceutical composition according to claim 8 .

14 . A method according to claim 12 , wherein the disorder is schizophrenia.

15 . A method according to claim 13 , wherein the disorder is schizophrenia.