Inhibitors of histone deacetylase

1. A compound, N oxide, pharmaceutically acceptable salt, a racemic or scalemic mixture, or diastereomer or enantiomer thereof according of the Formula (II):

wherein

each n is independently 0-3; and

R g is independently selected from the group consisting of —C 0 -C 3 alkyl-aryl, -C 0 -C 3 alkyl-heteroaryl, —C 0 -C 3 alkyl-cycloalkyl, and —C 0 -C 3 alkyl-heterocylyl; and

each R c is selected from the group consisting of H, —C 1 -C 6 alkyl, —C 2 -C 3 alkyl-OR e , heteroaryl, -heteroaryl-heteroaryl, -heteroaryl-aryl, -aryl-heteroaryl, —C(O)-aryl, —C 1 -C 3 -alkoxy-C 1 -C 3 -alkyl, —C 2 -C 3 alkyl-O—C 1 -C 3 alkyl, —C 2 -C 3 alkyl-NR e R f , and —CH 2 —C(CH 3 ) 2 —NR e R f , in which each aryl and heteroaryl is optionally substituted with one, two or three substituents independently selected from amino, OCH 3 and OH;

wherein each R e and R f is independently selected from the group consisting of —H, -alkyl, -aryl, -aryl-aryl, -hetetoaryl, heteroaryl-aryl, heteroaryl-heteroaryl, —C(O)-alkyl, and —C(O)CF 3 ; and

wherein each cycloalkyl, heterocyclyl, aryl, alkyl and heteroaryl moiety is optionally substituted unless expressly stated otherwise,

the heterocyclyl substituents are selected from hydroxyl, halogen, cyano, nitro, alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle, aryl, —OR u , —SR u , —S(═O)R y , —S(═O) 2 R y , —P(═O) 2 R y , —S(═O) 2 OR y , —P(═O) 2 OR y , —NR v R w , —NR v S(═O) 2 R y , —NR v P(═O) 2 R y , —S(═O) 2 NR v R w , —P(═O) 2 NR v R w , —C(═O)OR y , —C(═O)R u , —C(═O)NR v R w , —OC(═O)R u , —OC(═O)NR v R w , —NR v C(═O) OR y , —NR x C(═O)NR v R w , —NR x S(═O) 2 NR v R w , —NR x P(═O) 2 NR v R w , —NR v C(═O) R u , or —NR v P(═O) 2 R y , wherein R u is hydrogen, alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle, or aryl; R v , R w and R x are independently hydrogen, alkyl, cycloalkyl, heterocycle or aryl, or said R v and R w together with the N to which they are bonded optionally form a heterocycle; and R y is alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle or aryl,

the aryl substituents are selected from hydroxyl, cyano, nitro, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle, aryl, —OR u , —SR u , —S(═O)R y , —S(═O) 2 R y , —P(═O) 2 R y , —S(═O) 2 OR y , —P(═O) 2 OR y , —NR v R w , —NR v S(═O) 2 R y , —NR v P(═O) 2 R y , —S(═O) 2 NR v R w , —P(═O) 2 NR v R w , —C(═O)OR y , —C(═O)R u , —C(═O)NR v R w , —OC (═O)R u , —OC(═O)NR v R w , —NR v C(═O)OR y , —NR x C(═O)NR v R w , —NR x S(═O) 2 N R v R w , —NR x P(═O) 2 NR v R w , —NR v C(═O)R u or —NR v P(═O) 2 R y , wherein R u is hydrogen, alkyl, cycloalkyl, alkenyl, cycloalkenyl, heterocycle or aryl; R v , R w and R x are independently hydrogen, alkyl, cycloalkyl, heterocycle or aryl, or said R v and R w together with the N to which they are bonded optionally form a heterocycle; and R y is alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle or aryl;

provided the compound does not have the formula (B)

in which

each R 12 is independently H, alkyl, halo or alkoxy;

R 13 is hydrogen; and

R 14 is H.

2. A compound, N oxide, pharmaceutically acceptable salt, a racemic or scalemic mixture, or diastereomer or enantiomer thereof of Formula XX:

wherein

each L 1 is independently selected from the group consisting of H, halo, —O-alkyl, —S-alkyl, —NO 2 , —N(R e )C(O)—C 0 -C 3 alkyl-aryl, —N(R e )C(O)—C 0 -C 3 alkyl-heteroaryl, —N(R a )(R b ), —N(R c )(R d ), —OH, -alkyl, —OCF 3 , and —CF 3 ; and

Y 1 is selected from the group consisting of —Z—Z 2 -D,

wherein

Z is selected from the group consisting of —O—, —N(R c )C(O)—, —C(O)N(R c )—C(O)—, —C(O)N(R c )—, —N(R c )—, —N(R c )(C 2 -C 4 alkyl-OR d )—, —C(O)—, —C(NOR 21 )—, —CH[C(O)N(R 21 )(R 22 )]-C(O)N(R 22 )—, —CH(N(R 21 )(R 22 ))—C(O)N(R 22 )—, —CH[C(O)N(R c )(R f )]—C(O)N(R 22 )—, —S(O) 2 N(R 21 )—, —N(R 21 )S(O) 2 N(R 22 )—, —OC(O)—, —C(O)O—, —N(R 21 )C(NR 22 )—, —C(NR 22 )N(R 21 )—, —N(R 21 )C(O)N(R 22 )—, —N(R 21 )C(O)O—, —OC(O)N(R 21 )—, —N(R 21 )C(S)—, —C(S)N(R 21 )—, —N(R 21 )C(S)N(R 22 )—, —N(R 21 )C(S)O—, —OC(S)N(R 21 )—, —O—C 2 -C 4 alkyl-N(R 21 )—, —N(R 21 )—C 2 -C 4 alkyl-O—, —N(C 2 -C 4 alkyl-O-alkyl)-C 2 -C 4 alkyl-O—, —O—C 2 -C 4 alkyl-N(R c )—, —N(R 21 )—C 2 -C 4 alkyl-O—, —N(R c )—C 2 -C 4 alkyl-N(R d )—, —O—C 1 -C 4 alkyl-S(O) 2 N(R 21 )—, —O—C 1 -C 4 alkyl-O—, —O—C 1 -C 4 alkyl-O—C 1 -C 4 alkyl-O—, —S(O) 2 N(R 21 )—C 2 -C 4 alkyl-O—, —O—C 2 -C 4 alkyl-N(R 21 )S(O) 2 —, —N(R 21 )S(O) 2 —C 1 -C 4 alkyl-O—, —C(O)—C 1 -C 4 alkyl-N(R 21 )—, —N(C(O)—C 1 -C 4 alkyl)-, —N(R 21 )—C 1 -C 4 alkyl-C(O)—, —O—C 1 -C 4 alkyl-C(O)N(R 21 )—, —C(O)N(R 21 )—C 2 -C 4 alkyl-O—, —C(O)—C 1 -C 4 alkyl-O—, —C(O)—C 1 -C 4 alkyl-S(O) 0-2 —, —O—C 2 -C 4 alkyl-N(R 21 )C(O)—, —N(R 21 )C(O)—C 1 -C 4 alkyl-O—, —N(R 21 )C(O)—C 1 -C 4 alkyl-S(O) 0-2 —, —O—C 1 -C 4 alkyl-C(O)—, —C(O)—C 1 -C 4 alkyl-O—, —N(R 21 )—C 1 -C 4 alkyl-C(O), —C(O)—C 1 -C 4 alkyl-N(R 21 )—, —O—C 1 -C 4 alkyl-C(S)—, —C(S)—C 1 -C 4 alkyl-O—, —N(R 21 )—C 1 -C 4 alkyl-C(S), —C(S)—C 1 -C 4 alkyl-N(R 21 )—, —N(R 21 )—C 1 -C 4 alkyl-C(S)—, —O—C 1 -C 4 alkyl-C(S)N(R 21 )—, —C(S)N(R 21 )—C 2 -C 4 alkyl-O—, —O—C 2 -C 4 alkyl-N(R 21 )C(S)—, —N(R 21 )C(O)—C 1 -C 4 alkyl-O—, —N(R 21 )C(S)—C 1 -C 4 alkyl-O—, —N(R 21 )—C 1 -C 4 alkyl-S(O) 2 —, —O—C 1 -C 4 alkyl-S(O) 2 N(R 21 )—, —S(O) 2 N(R 21 )—C 2 -C 4 alkyl-O—, —O—C 2 -C 4 alkyl-N(R 21 )S(O) 2 —, —N(R 21 )S(O) 2 —C 1 -C 4 alkyl-O—, —O—C 2 -C 4 alkyl-OC(O)N(R 21 )—, and —O—C 2 -C 4 alkyl-OC(S)N(R 21 )—, wherein each alkyl moiety is optionally substituted;

Z 2 is selected from the group consisting of a alkyl, alkenyl, alkynyl, alkyl-alkenyl, alkynyl-alkyl, and alkyl-alkynyl, wherein each alkyl, alkenyl and alkynyl moiety is optionally substituted;

D is selected from the group consisting of H, aryl, heteroaryl, alkyl, alkenyl, alkynyl, heteroalkyl, cycloalkyl, heterocyclyl, bridged heterocyclyl, spiro heterocyclyl, aromatic polycycles, non-aromatic polycycles, polyheteroaryl groups, non-aromatic polyheterocyclic, mixed aryl, and non-aryl polyheterocycle, each of which is optionally substituted and each of which is optionally fused to one or more aryl or heteroaryl rings, or one or more saturated or partially unsaturated cycloalkyl or heterocyclyl rings, each of which ring is optionally substituted, wherein

each R 21 and R 22 is independently selected from the group consisting of —H, -alkyl, -aryl and heteroaryl, wherein each said aryl and heteroaryl moiety is optionally substituted;

in which

each R a and R b together with the nitrogen to which they are bound form a 4 to 7 membered heterocyclyl having 1 or 2 annular heteroatoms, or a 5 to 8 membered bridged heterocyclyl having 1 or 2 annular heteroatoms, the heterocyclyl being optionally substituted with 1-3 substituents independently selected from the group consisting of H, OH, oxo, N(R c )(R d ), C 1 -C 6 alkyl, aryl, heteroaryl, —C 1 -C 6 alkyl-aryl, —C 1 -C 6 alkyl-heteroaryl, —C 1 -C 3 alkoxy-C 1 -C 3 alkyl, —C 2 -C 3 alkyl-O—H, —C 2 -C 3 alkyl-O—C 1 -C 4 alkyl, —C 5 -C 6 cycloalkyl, —C 0 -C 3 alkyl-N(H)—C(O)—C 1 -C 3 alkyl, —C 0-3 alkyl-N(H)—C(O)-haloalkyl, —C 0 -C 3 alkyl-NHC(O)O—C 1 -C 3 alkyl-aryl, —C 0 -C 3 alkyl-CF 3 , —C 0 -C 3 alkyl-NHC(O)O-C 1 -C 3 alkyl-heteroaryl, and —C 0 -C 3 alkyl-NH 2 , wherein said heterocyclyl is optionally fused to an aryl or heteroaryl;

each R c is selected from the group consisting of H, —C 1 -C 6 alkyl, —C 2 -C 3 alkyl-OR e , heteroaryl, -heteroaryl-heteroaryl, -heteroaryl-aryl, -aryl-heteroaryl, —C(O)-aryl, —C 1 -C 3 -alkoxy-C 1 -C 3 -alkyl, —C 1-2 —C 3 alkyl-O—C 1 -C 3 alkyl, —C 2 -C 3 alkyl-NR e R f , —CH 2 —C(CH 3 ) 2 —NR e R f , in which each aryl and heteroaryl is optionally substituted with one, two or three substituents independently selected from amino, OCH 3 and OH;

each R d is independently selected from the group consisting of H, —C 1 -C 6 alkyl, —C 2 -C 3 alkyl, aryl, heteroaryl, -heteroaryl-heteroaryl, -heteroaryl-aryl, -aryl-heteroaryl, —C(O)-aryl, —C 1 -C 3 -alkoxy-C 1 -C 3 -alkyl, —C 2 -C 3 alkyl-O—C 1 -C 3 alkyl, —C 2 -C 3 alkyl-NR e R f , and —CH 2 —C(CH 3 ) 2 —NR e R f , in which each aryl and heteroaryl is optionally substituted with one, two or three substituents independently selected from amino, OCH 3 and OH; or

each R e and R f is independently selected from the group consisting of —H, -alkyl, -aryl, -aryl-aryl, -hetetoaryl, heteroaryl-aryl, heteroaryl-heteroaryl, —C(O)-alkyl, and —C(O)CF 3 ; and

wherein each cycloalkyl, heterocyclyl, aryl, alkyl and heteroaryl moiety is optionally substituted unless expressly stated otherwise,

the heterocyclyl substituents are selected from hydroxyl, halogen, cyano, nitro, alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle, aryl, —OR o , —SR u , —S(═O)R y , —S(═O) 2 R y , —P(═O) 2 R y , —S(═O) 2 OR y , —P(═O) 2 OR y , —NR v R w , —NR v S(═O) 2 R y , —NR v P(═O) 2 R y , —S(═O) 2 NR v R w , —P(═O) 2 NR v R w , —C(═O)OR y , —C(═O)R u , —C(═O)NR v R w , —OC(═O)R u , —OC(═O)NR v R w , —NR v C(═O)OR y , —NR x C(═O)NR v R w , —NR x S(═O) 2 NR v R w , —N R x P(═O) 2 NR v R w , —NR v C(═O)R u or —NR v P(═O) 2 R y , wherein R u is hydrogen, alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle or aryl; R v , R w and R x are independently hydrogen, alkyl, cycloalkyl, heterocycle or aryl, or said R v and R w together with the N to which they are bonded optionally form a heterocycle; and R y is alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle or aryl,

the aryl substituents are selected from hydroxyl, cyano, nitro, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle, aryl, —OR u , —SR u , —S(═O)R y , —S(═O) 2 R y , —P(═O) 2 R y , —S(═O) 2 OR y , —P(═O) 2 OR y , —NR v R w , —NR v S(═O) 2 R y , —NR v P(═O) 2 R y , —S(═O) 2 NR v R w , —P(═O) 2 NR v R w , —C(═O)OR y , —C(═O)R u , —C(═O)NR v R w , —OC(═O)R u , —OC(═O)NR v R w , —NR v C(═O)OR y , —NR x C(═O)NR v R w , —NR x S(═O) 2 NR v R w , —NR x P(═O) 2 NR v R w , —NR v C(═O)R u or —NR v P(═O) 2 R y , wherein R u is hydrogen, alkyl, cycloalkyl, alkenyl, cycloalkenyl, heterocycle or aryl; R v , R w and R x are independently hydrogen, alkyl, cycloalkyl, heterocycle or aryl, or said R v and R w together with the N to which they are bonded optionally form a heterocycle; and R y is alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, heterocycle or aryl;

provided the compound does not have the formula (B)

in which

each R 12 is independently H, alkyl, halo or alkoxy;

R 13 is hydrogen; and

R 14 is H.

3. The compound, N oxide, pharmaceutically acceptable salt, a racemic or scalemic mixture, or diastereomer or enantiomer thereof according to claim 2 , wherein the compound has Formula XX-A:

wherein

each L 1 is independently selected from the group consisting of H, —O—CH 3 , —CH 3 and —OH; and

Y 1 is selected from the group consisting of —Z—Z 2 -D;

wherein

Z is selected from the group consisting of —O—, —N(R c )C(O)—, —C(O)N(R c )—, —N(R c )—, —S(O) 2 N(R 21 )—, —O—C 2 -C 4 alkyl-N(R 21 )—, —N(R 21 )—C 2 -C 4 alkyl-O—, —N(R c )—C 2 -C 4 alkyl-N(R d )—, and —O—C 1 -C 4 alkyl-O—;

Z 2 is an optionally substituted alkyl; and

D is selected from the group consisting of H, aryl, heteroaryl, alkyl, cycloalkyl and heterocyclyl, each of which is optionally substituted and each of which is optionally fused to one or more aryl or heteroaryl rings, or one or more saturated or partially unsaturated cycloalkyl or heterocyclyl rings, each of which ring is optionally substituted.

4. A pharmaceutical composition comprising a pharmaceutically acceptable carrier, excipient, or diluent, and a compound according to claim 1 .

5. A compound selected from the group consisting of

2-(4-(benzyloxy)phenyl)-N-hydroxy-2-phenylacetamide,

N-hydroxy-2-(4-(2-morpholinoethoxy)phenyl)-2-phenylacetamide,

N-hydroxy-2-phenyl-2-(4-(2-(pyrrolidin-1-yl)ethoxy)phenyl)acetamide,

N-hydroxy-2-(4-morpholinophenyl)-2-m-tolylacetamide,

N-hydroxy-2-(4-morpholinophenyl)-2-o-tolylacetamide,

N-hydroxy-2-(4-(2-morpholino-2-oxoethoxy)phenyl)-2-phenylacetamide,

2-(4-(diethylamino)phenyl)-N-hydroxy-2-phenylacetamide,

2-(4-(dimethylamino)phenyl)-N-hydroxy-2-phenylacetamide,

2-(biphenyl-4-yl)-N-hydroxy-2-phenylacetamide,

N-hydroxy-2-phenyl-2-(4-(pyrrolidin-1-yl)phenyl)acetamide,

2-(4-(4-cyclopentylpiperazin-1-yl)phenyl)-N-hydroxy-2-phenylacetamide,

2-(4′-(dimethylamino)biphenyl-4-yl)-N-hydroxy-2-phenylacetamide,

2-(4-(diethylamino)phenyl)-2-(3-fluorophenyl)-N-hydroxyacetamide,

N-hydroxy-2-(4-(2-phenoxyethoxy)phenyl)-2-phenylacetamide,

N-(4-(2-(hydroxyamino)-2-oxo-1-phenylethyl)phenyl)-4-methylbenzamide; and

2-(4-(diethylamino)phenyl)-N-hydroxy-2-(3-methoxyphenyl)acetamide;

or an N-oxide, or pharmaceutically acceptable salt thereof, racemic or scalemic mixture thereof, or a diastereomer or enantiomer thereof.