Acetylene derivatives as inhibitors of histone deacetylase

1. A compound of Formula (I):

wherein:

R is hydrogen;

Ar 1 is phenylenc and the triple bond attached to Ar 1 is in the para position relative to the —CONHOH group, wherein said Ar 1 is optionally substituted with one or two substituents independently selected from alkyl, halo, alkoxy, haloalkoxy, or haloalkyl;

X and Y are a bond;

R 1 and R 2 are hydrogen or alkyl;

Z is —CONH—;

Ar 2 is heteroaryl;

and individual stercoisomers, individual geometric isomers, or mixtures thereof: or a pharmaceutically acceptable salt thereof.

2. The compound of claim 1 wherein Ar 2 is thiophenyl, pyridinyl, quinolinyl, thiazolyl, benzthiazolyl, benzoxazolyl, furanyl, benzimidazolyl, benzothiophenyl, pyrrolyl, indolyl, isoindolyl, or isoquinolinyl optionally substituted with one or two substituents independently selected from alkyl, alkoxy, alkoxyalkyl, halo, haloalkyl, haloalkoxy, alkylamino, dialkylamino, hydroxy, hydroxyalkyl, hydroxyalkyloxy, aminoalkyl, aminoalkoxy, alkoxyalkyloxy, optionally substituted phenyl, optionally substituted heteroaryl, optionally substituted phenyloxyalkyl, optionally substituted heteroaralkyloxy, optionally substituted heteroaryloxyalkyl, optionally substituted heterocycloalkylalkyloxy, or optionally substituted heterocycloalkylalkyl.

3. The compound of claim 1 wherein Ar 2 is thiazolyl, quinolinyl, oxazulyl, benzothiophenyl, indolyl, benzofuranyl, benzthiazolyl, or benzimidazolyl optionally substituted with a substituent selected from halo, haloalkyl, alkoxy, haloalkoxyalkyl, aminoalkoxy, aminoalkyl, alkoxyalkyloxy, alkoxyalkyloxyalkyl, optionally substituted heterocycloalkyloxy, optionally substituted hetrocycloalkylalkyloxy, or phenyl optionally substituted with -(alkylene)NRR′ where R and R′ are independenly hydrogen or alkyl.

4. A compound selected from the group consisting of;

N-hydroxy-4-[3-(3-phenylacryloylamino)prop-1-ynyl]-benzamide,

N-hydroxy-4-[3-(4-phenylthiazol-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-S-(3-phenylacryloylamino)-but-1-ynyl]-benzamide;

N-hydroxy-4-[3-(4-methoxyquinolin-2-ylcarbonylamino)prop-ynyl]-benzamide;

N-hydroxy-4-{3-[2-(4-aminomethylphenyl)oxazol-5-ylcarbonylamino}prop-1-ynyl]-benzamide hydrochloride;

N-hydroxy-4-[3S-(4-phenylthiazol-2-ylcarbonylamino)but-1-ynyl]-benzamide;

N-hydroxy-4-[3-(phenylcarbonlamino)prop-1-ynyl[-benzamide;

N-hydroxy-4-[3-(benzothiophen-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(5-chlorobenzofuran-2-ylcarbonylamino)-prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(5-indol-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(benzofuran-2-ylcarbonylamino)prop-1-ynyl]-benzarmide;

N-hydroxy-4-[3S-(benzothiophen-2-ylcarbonylamino)but-1-ynyl]-benzamide;

N-hydroxy-4-[3-(indol-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-{3-[3-(2,2,2-trifluoroethyloxymethyl)benzofuran-2-yl-carbonyl-amino]prop-1-vnyl }-benzamide;

N-hydroxy-4-[3-(benzthiazol-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(4-trifluorornethylbenzothiophen-2-ylcarbonyl-amino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(5-fluorobenzothiophen-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(3-N,N-dimethylaminomethylbenzofuran-2-ylcarbonylamino)prop-1-ynyl]-benzamide hydrochloride;

N-hydroxy-4-{3-[1-(2-N,N-dimethylaminoethyl)benzimidazol-2-ylcarbonyl-amino]prop-1-ynyl}benzamide;

N-hydroxy-4-[3-(4-methoxybenzofuran-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(4-N,N-dimethylaminoethoxybenzofuran-2-ylcazbonylamino-)prop-1-ynyl]-benzamide hydrochloride,

N-hydroxy-4-[3-(4-methoxyindol-2ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(4-N,N-dimethylaminoethoxyindol-2-yl-carbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(5-methoxyindol-2-ylcarbonylamino)prop-1-ynyl]-benzamide;

N-hydroxy-4-[3-(5-N,N-dimethylaminoethoxyindol-2-ylcarbonyl-amino)prop-1-ynyl]-benzamide hydrochloride;

N-hydroxy-4-{3-[3-(2-methoxyethyloxymethyl)-benzofuran-2-yl-carbonylamino]prop-1-ynyl]benzamide;

N-hydroxy-4-{3-[3-(2-methoxyethyloxy)indol-2-yl-carbonylamino]prop-1-ynyl}-benzamide;

N-hydroxy-4-[3-(5-tetrahydropyran-4-yloxybenzofuran-2-yl-carbonylamino)prop-1-ynyl]benzamide;

N-hydroxy-4-{3-[5-(2-pyrrolidin-1-ylethoxy)benzofuran-2-yl-carbonylamino]prop-1-ynyl}benzamide hydrochloride;

N-hydroxy-4-{3-[5-(2-methoxyethyloxy)benzofuran-2-yl-carbonylamino]prop-1-ynyl}-benzamide;

N-hydroxy-4-{3-[4-(N,N-dimethylaminoethyloxy)quinolin-2-yl-carbonylamino]prop-1-ynyl}benzamide hydrochloride;

N-hydroxy-4-{3-[5-(1-(2,2,2-trifluoroethyl)piperidin-4-yloxy)benzofuran-2-ylcarbonyl-amino ]prop-1-ynyl}benzamide;

N-hydroxy-4-{3-[5-(1-cyclopropylpiperidin-4-yloxy)benzofuran-2-yl-carbonylamino]-prop-1-ynyl}benzamide hydrochloride;

N-hydroxy-4-{3-[5-(tetrahydropyran-4-ylmethyloxy)benzofuran-2-ylcarbonylamino]-prop-1-ynyl}benzamide;

N-hydroxy-4-{3-[5-(2-morpholin-4-ylethyloxy)benzofuran-2-yl-carbonylamino]prop-1-ynyl}benzamide hydrochloride;

N-hydroxy-4-{3-[3-(4-chlorophenyl)ureido]prop-1-ynyl}benzamide;

N-hydroxy-4-{3-[3-(4-trifluorormethylphenyl)ureido]prop-1-ynyl}benzamide;

N-hydroxy-4-{3-[3-(phenyl)ureido]prop-1-ynyl}benzamide;

N-hydroxy-4-{3-[3-(2-trifluoromethyloxyphenyl)ureido]prop-1-ynyl}benzamide;

N-hydroxy-4-[3-methyl-3-(3-phenylacryloylamino)but-1-ynyl]-benzamide;

N-hydroxy-4-[3-methyl-3-(4-phenylthiazol-2-ylcarbonylamino)but-1-ynyl]-benzamide;

N-hydroxy-4-[3-methyl-3-(benzithiazol-2-ylcarbonylamino)but-1-ynyl]-benzamide; and

N-hydroxy-4-[3-methyl-3-(benzofuran-2-ylcarbonylamino)but-1-ynyl]-benzamide; or a pharmaceutically acceptable salt thereof.

5. N-hydroxy-4-[3-(5-N,N-dimethylaminoethoxyindol-2-ylcarbonylamino)prop-1-ynyl}-benzamide; or a pharmaceutically acceptable salt thereof and having the structure:

6. N-hydroxy-4-[3-(2-methoxyethyloxymethyl)indol-2-ylcarbonylamino)prop-1-ynyl]-benzamide; or a pharmaceutically acceptable salt thereof and having the structure:

7. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 1 and a pharmaceutically acceptable excipient.

8. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 2 and a pharmaceutically acceptable excipient.

9. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 3 and a pharmaceutically acceptable excipient.

10. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 4 and a pharmaceutically acceptable excipient.

11. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 5 and a pharmaceutically acceptable excipient.

12. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 6 and a pharmaceutically acceptable excipient.