CA2540459C

CA2540459C - Benzimidazole compounds and uses in treating proliferative disorders

Info

Publication number: CA2540459C
Application number: CA2540459A
Authority: CA
Inventors: Pek Ling Lye; Weiping Deng; Ken Chi Lik Lee; Eric T. Sun; Dizhong Chen; Niefang Yu; Haishan Wang
Original assignee: Mei Pharma Inc
Current assignee: Mei Pharma Inc
Priority date: 2005-09-08
Filing date: 2006-03-21
Publication date: 2014-02-18
Anticipated expiration: 2026-03-21
Also published as: CA2540459A1; AR105930A2; ES2367811T3; AU2006201177B2; AU2006201177A1; SI1937650T1; ZA200803017B; CN101287712A; CN101287712B

Abstract

The present invention relates to compounds which are inhibitors of histone deacetylase. More particularly, the present invention relates to heterocyclic compounds and methods for their preparation. These compounds may be useful as medicaments for the treatment of proliferative disorders as well as other diseases involving, relating to or associated with enzymes having histone deacetylase (HDAC) activities.

Description

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BENZIMIDAZOLE COMPOUNDS AND USES IN TREATING PROLIFERATIVE DISORDERS
FIELD OF THE INVENTION
[0001] The present invention relates to hydroxamate compounds that are inhibitors of histone deacetylase (HDAC). More particularly, the present invention relates to benzimidazole containing compounds and methods for their preparation. These compounds may be useful as medicaments for the treatment of proliferative disorders as well as other diseases involving, relating to or associated with enzymes having histone deacetylase (HDAC) activities.
BACKGROUND OF THE INVENTION

[0002] Local chromatin architecture is generally recognized as an important factor in the regulation of gene expression. The architecture of chromatin, a protein-DNA
complex, is strongly influenced by post-translational modifications of the histones which are the protein components. Reversible acetylation of histones is a key component in the regulation of gene expression by altering the accessibility of transcription factors to DNA. In general, increased levels of histone acetylation are associated with increased transcriptional activity, whereas decreased levels of acetylation are associated with repression of gene expression [Wadem P.A. Hum. Mol. Genet. 10, 693-698 (2001), De Ruijter A.J.M. et al, Biochem. J., 370, 737-749 (2003)]. In normal cells, histone deacetylases (HDACs) and histone acetyltransferase together control the level of acetylation of histones to maintain a balance. Inhibition of HDACs results in the accumulation of acetylated histones, which results in a variety of cell type dependent cellular responses, such as apoptosis, necrosis, differentiation, cell survival, inhibition of proliferation and cytostasis.

[0003] Inhibitors of HDAC have been studied for their therapeutic effects on cancer cells. For example, suberoylanilide hydroxamic acid (SAHA) is a potent inducer of differentiation and/or apoptosis in murine erythroleukemia, bladder, and myeloma cell lines [Richon V.M. et al, Proc. Natl. Acad. Sci. USA, 93: 5705-5708 (1996), Richon V.M. et al, Proc. Natl. Acad. Sci. USA, 95: 3003-3007 (1998)]. SAHA has been shown to suppress the growth of prostate cancer cells in vitro and in vivo [Butler L.M. et al, Cancer Res. 60, 51 65-51 70 (2000)]. Other inhibitors of HDAC that have been widely studied for their anti-cancer activities are trichostatin A (TSA) and trapoxin B [Yoshida M. et al, J. Biol. Chem., 265, 17174 (1990), Kijima M. et al, J. Biol. Chem., 268, 22429 (1993)]. Trichostatin A is a reversible inhibitor of mammalian HDAC. Trapoxin B is a cyclic tetrapeptide, which is an irreversible inhibitor of mammalian HDAC.
However, due to the in vivo instability of these compounds they are less desirable as anti-cancer drugs. Recently, other small molecule HDAC inhibitors have become available for clinical evaluation [US6,552,065]. Additional HDAC inhibiting compounds have been reported in the literature [Bouchain G. et al, J. Med. Chem., 46, 820-830 (2003)] and patents [WO 03/066579A2]. The in vivo activity of such inhibitors can be directly monitored by their ability to increase the amount of acetylated histones in the biological sample. HDAC inhibitors have been reported to interfere with neurodegenerative processes, for instance, HDAC inhibitors arrest polyglutamine-dependent neurodegeneration [Nature, 413(6857): 739-43, 18 October, 2001]. In addition, HDAC
inhibitors have also been known to inhibit production of cytokines such as TNF, IFN, IL-1 which are known to be implicated in inflammatory diseases and/or immune system disorders. [J. Biol. Chem. 1990; 265(18): 10230-10237; Science, 1998; 281:

1005; Dinarello C.A. and Moldawer L.L. Proinflammatory and anti-inflammatory cytokines in rheumatoid arthritis, A primer for clinicians, 2rid Edition, Amergen Inc., 2000].

[0004] Nevertheless, there is still a need to provide further HDAC inhibitors that would be expected to have useful, improved pharmaceutical properties in the treatment of diseases such as cancer, neurodegenerative diseases, disorders involving angiogenesis and inflammatory and/or immune system disorders. With a view to meeting this need a number of small organic moiety scaffolds have been investigated including a number of heterocyclic systems, especially bicyclic heterocyclic ring systems. One heterocyclic system that has been investigated has been the benzimidazole ring system. We have now found that judicious selection of the substituents on the 5 membered ring of the benzimidazole ring system leads to the production of a family of compounds with improved pharmacokinetic properties when compared with the compounds of the prior art. The compounds within the family exhibit microsomal stability and thereby demonstrate improved half lives in the plasma when compared to the compounds of the prior art. The compounds within the family typically provide a longer duration of action due to the increased in vivo exposure (i.e., area under the curve, AUCo_last) thereby yielding improved tumor growth inhibition profiles in the xenograft models.
SUMMARY OF THE INVENTION

[0005] In one aspect the present invention provides a compound of the formula (I):

N N/

Formula (I) wherein

[0006] R1 is an optionally substituted heteroaryl group, an optionally substituted heterocycloalkyl group or a group of formula:
-(CR20R21)m_(c R22 R23)._( c R24 R25)._ N R26 R27;

[0007] R2 is selected from the group consisting of: H, alkyl, alkenyl, alkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, cycloalkylalkyl, alkoxyalkyl, R11S(0)R13-, R11S(0)2R13-, R11C(0)N(R12)R13-, R11S02N(R12)R13-, R11N(R12)C(0)R13-, R11N(R12)S02R13-, R11N(R12)C(0)N(R12)R13- and acyl, each of which may be optionally substituted;

[0008] R3 is selected from the group consisting of H, C1 -C6 alkyl, and acyl, each of which may be optionally substituted;

[0009] X and Y are the same or different and are independently selected from the group consisting of: H, halogen, -CN, -NO2, -CF3, -0CF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkoxyheteroaryl, alkenyloxy, alkynyloxy, cycloalkyloxy, cycloalkenyloxy, heterocycloalkyloxy, heterocycloalkenyloxy, aryloxy, heteroaryloxy, arylalkyl, heteroarylalkyl, arylalkyloxy, -amino, alkylamino, acylamino, aminoalkyl, arylamino, sulfonyl, alkylsulfonyl, arylsulfonyl, aminosulfonyl, aminoalkyl, alkoxyalky, -C001-1 -C(0)0R5, -COR5, -SH, -SR6, -OW acyl and -NR7R5, each of which may be optionally substituted;

[0010] each R4 is selected from the group consisting of: H, alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl, each of which may be optionally substituted;

[0011] each R5 is independently selected from the group consisting of: alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl, each of which may be optionally substituted;

[0012] each R6 is independently selected from the group consisting of: alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl;
each of which may be optionally substituted;

[0013] each R7 and R5 is independently selected from the group consisting of:
H, alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl, each of which may be optionally substituted;

[0014] each R11 and R12 is independently selected from the group consisting of H, alkyl, alkenyl, and alkynyl, each of which may be optionally substituted;

[0015] each R13 is a bond or is independently selected from the group consisting of:
alkyl, alkenyl, and alkynyl, each of which may be optionally substituted;

[0016] each R20, R21, R22, R23, R24 and R25 is independently selected from the group consisting of: H, halogen, -CN, -NO2, -CF3, -0CF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl, arylalkenyl, cycloalkylheteroalkyl, heterocycloalkylheteroalkyl, heteroarylheteroalkyl, arylheteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkoxyheteroaryl, alkenyloxy, alkynyloxy, cycloalkylkoxy, heterocycloalkyloxy, aryloxy, arylalkyloxy, phenoxy, benzyloxy heteroaryloxy, amino, alkylamino, acylamino, aminoalkyl, arylamino, alkoxycarbonyl, alkylaminocarbonyl, sulfonyl, alkylsulfonyl, aminosulfonyl, arylsulfonyl, arylsulfinyl -COON, -C(0)0R5, -COR5, -SH, -SR6, -OW and acyl, each of which may be optionally substituted; or R2 and R21 when taken together may form a group of formula =0 or =S, and/or R22 and R23 when taken together may form a group of formula =0 or =S, and/or R24 and R25 when taken together may form a group of formula =0 or =S;

[0017] each R26 and R27 is independently selected from the group consisting of: H, halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalkylalkyl, 5 heterocycloalkylalkyl, arylalkyl, heteroarylalkyl, arylalkenyl, cycloalkylheteroalkyl, heterocycloalkylheteroalkyl, heteroarylheteroalkyl, aryl heteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkenyloxy, alkynyloxy, cycloalkylkoxy, heterocycloalkyloxy, aryloxy, arylalkyloxy, heteroaryloxy, amino, alkylamino, aminoalkyl, acylamino, arylamino,' phenoxy, benzyloxy, COOH, alkoxycarbonyl, alkylaminocarbonyl, sulfonyl, alkylsulfonyl, alkylsulfinyl, arylsulfonyl, arylsulfinyl, aminosulfonyl, SR5 and acyl, each of which may be optionally substituted, or R26 and R27 when taken together with the nitrogen atom to which they are attached form an optionally substituted heterocycloalkyl group;

[0018] Z is a bond or is selected from the group consisting of -CH2-, -CH2CH2-, -CH=CH-, C3-C6 alkylene, C3-C6 alkenylene, C3-C6 alkynylene, C3-C6 cycloalkyl, unsubstituted or substituted with one or more substituents independently selected from the group consisting of C1-C4 alkyl;

[0019] m, n and o are integers independently selected from the group consisting of 0, 1, 2, 3 and 4;

[0020] or a pharmaceutically acceptable salt or prodrug thereof.

[0021] In one embodiment of the invention R4 is H and the compounds are those of formula (la):

OH

Formula (la)

[0022] or a pharmaceutically acceptable salt or prodrug thereof

[0023] wherein R1, R2, R3, X, Y and Z are as defined for compounds of formula (I).

[0024] In another embodiment R3 and R4 are H and the compounds are of formula (lb):

R2-- 3 I 4 5 ¨Z OH
., 61 Formula (lb)

[0025] or a pharmaceutically acceptable salt or prodrug thereof

[0026] wherein Ize, R2, R3, X, Y and Z are as defined for compounds of formula (I).

[0027] As with any group of structurally related compounds which possess a particular utility, certain groups are preferred for the compounds of the Formula (I), (la) and (lb) in their end use application.

[0028] In one embodiment the group R1 is a group of formula -(CR20R21)m-(cR22R23)n..(c R24R25)04NR26R27;

[0029] in which m, n and o are integers independently selected from the group consisting of 0, 1, 2, 3 and 4;

[0030] Accordingly in one embodiment the compounds of the invention are compounds of formula (lc):
X 0 ,R3 R2-- 31 I 4 5j-Z 0-R4 NN

Formula (lc) wherein R1 is a group of formula _(cRR),,r(cR22R23),r( 2021 cR24R25)0_NR26R27

[0031] and R2, R3, R4, X, Y, Z, R20, R21, R22, R23, R24, R25, R26, K m, n and o are as defined for compounds of formula (I).

[0032] As the values of m, n and o are integers ranging from 0 to 4 the sum of m+n+o is an integer selected from the group consisting of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12. In one embodiment the sum of m+n+o is an integer selected from the group consisting of 0, 1, 2, 3, 4, 5, 6, 7 and 8. In another embodiment the sum of m+n+o is an integer selected from the group consisting of 0, 1, 2, 3 and 4. In another embodiment that the sum of m+n+o is an integer selected from the group consisting of 2 and 3.

[0033] In one specific embodiment the sum of m+n+o is 2. When this occurs R1 is selected from the group consisting of:
c R20 R21 )2_N R26R27;
c R22 R23 )2_ NR26R27;
R24R25)2_NR26R27;
.(cR20R21 )-(cR22R23)_NR26R27;
_(cR20R21)-(cR24R25)_NR26R27;
R22R23xc R24R25)-NR26R27;

[0034] In one form of this embodiment R1 is the group:
_(cR20R21 )-(cR22R23)_NR26R27;

[0035] This provides compounds of the formula (II):

N' R2o R21 <

Formula (II)

[0036] wherein X, Y, Z, R2, R3, R4, R20, R21, R22, R23, R26 and K.-.27 are as defined in =
formula (I).

[0037] In a specific form of this embodiment R4 is H which provides compounds of formula (11a):

X
NI/
R24 3Z O¨H
7<><R22 R26-"N\ R23 .Formula (11a)

[0038] wherein X, Y, Z, R2, R3, R20, R21, R22, R23, R26 and 11.-.27 are as defined in formula (I).

[0039] In another specific form R3 is H leading to compounds of formula (11b):
X
N
R2-- 31 I 4 56-hZ 0¨H
y 1R2o7 oR N R23 Formula (11b)

[0040] wherein X, Y, Z, R2, R20, R21, R22, R23, R26 and 11 are as defined in formula (I).

[0041] In an even more specific form of this embodiment R20, R21, R22 and R23 are H
providing compounds of formula (11c):
X 0\\

31 7 -1--Z O¨H
pj R26,-N\

Formula (11c)

[0042] wherein X, Y, Z, R2, R26 and R27 are as defined in formula (I).

[0043] In another embodiment the sum of m+n+o is 3. When this occurs R1 is selected from the group consisting of:
..(cR2oR21)3_NR26R27;
_(cR22R23)3_NR26R27;
_(cR2.4R25)3_NR26R27;
-(CR2 R21)2-(CR22R23)-NR26R27 -(CR2 R21)2_(cR24R25).NR26R27 4cR'20R21xcR22R23)2_NR26R27 -(C R22R23)2-(CR24R25)-NR26 R27 _(cR20R21 )-(cR24R25)2-N R261:127 4cR22R23)..(c R24R25)2_NR26R27 -(CR20R21 )-(cR22R23)_(c R24R25)_NR2eR27;

[0044] In one form of this embodiment R1 is a group of the formula:
-(CR20R21)_(c R22R23)-(c R24R25yNR26R27.

[0045] This provides compounds of the formula (III):

Formula (III)

[0046] wherein X,Y, Z, R2, R3, R4, R20, R21, R22, R231R24, R25, -26 K and R27 are as defined in formula (I).

[0047] In a specific form of this embodiment R4 is H which provides compounds of formula (111a).

N/

AT-Z O¨H
7 ,`:,1 N' R2o Formula (111a)

[0048] wherein X,Y, Z, R2, R3, Ra, R20, R21, R22, R231R24, R25, R26 and K.-.27 are as 5 defined in formula (1).

[0049] In another specific form R3 is H leading to compounds of formula (111b):

-Z O¨H

Formula (111b) 10 [0050] wherein X,Y, Z, R2, R3, Fe, R20, R21, R22, R23,R24, R25, K.-.26 and R27 are as defined in formula (I).
[0051] In an even more specific form of this embodiment R20, R21, R24, R25 are H, and R22 and R23 are methyl providing compounds of formula (111c).

N
R2-- 3Dt1 I 4 5 -2> NO¨H
7 ,9 N

Formula (111c) [0052] wherein X,Y, Z, R2, R3, R4, R20, R21, R22, R23, R24, R25, R26 and 11 are as defined in formula (I).
[0053] In each of the above embodiments of the invention R2 and R21 may represent a number of different variables. In one embodiment R2 and R21 are independently selected from the group consisting of H, alkyl, alkenyl and alkynyl. In another embodiment R2 and R21 are independently selected from the group consisting of H and alkyl. In a specific embodiment R2 and R21 are both H.
[0054] In each of the above embodiments of the invention R22 and R23 may represent a number of different variables. In one embodiment R22 and R23 are independently selected from the group consisting of H, alkyl, alkenyl and alkynyl. In another embodiment R22 and R23 are independently selected from the group consisting of H and alkyl. In a further embodiment R22 and R23 are independently selected from the group consisting of alkyl. In a most specific embodiment R22 and R23 are both methyl.
[0055] In each of the above embodiments of the invention R24 and R25 may represent a number of different variables. In one embodiment R24 and R25 are preferably independently selected from the group consisting of H, alkyl, alkenyl and alkynyl. In another embodiment R24 and R25 are independently selected from the group consisting of H and alkyl. In a specific embodiment R24 and R25 are both H.
[0056] In each of the above embodiments there are a number of values for R26 and R27. In one embodiment R26 and R27 are independently selected from the group consisting of: H, alkyl, alkenyl, alkynyl, alkoxyalkyl, and acyl. In another embodiment R26 and R27 are independently selected from the group consisting of: H, alkyl and acyl.

In a further embodiment R26 and R27 are independently selected from the group . consisting of H, methyl, ethyl, isopropyl, propyl, 2-ethyl-propyl, 3,3-dimethyl-propyl, butyl, isobutyl, 3,3-dimethyl-butyl, 2-ethyl-butyl, pentyl, 2-methyl, pentyl, pent-4-enyl, hexyl, heptyl, octyl, acetyl and 2-methoxy-ethyl.
[0057] In another embodiment R1 is a heterocycloalkyl group which may optionally be substituted.
[0058] In one form of this embodiment the heterocycloalkyl group is selected from the group consisting of:
N/
R28 "R28 [0059] wherein R28 is selected from the group consisting of H, halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl, arylalkenyl, cycloalkylheteroalkyl, heterocycloalkylheteroalkyl, heteroarylheteroalkyl, arylheteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkenyloxy, alkynyloxy, cycloalkylkoxy, heterocycloalkyloxy, aryloxy, arylalkyloxy, heteroaryloxy, amino, alkylamino, aminoalkyl, acylamino, arylamino, phenoxy, benzyloxy, COOH, alkoxycarbonyl, alkylaminocarbonyl, arylacyl, sulfonyl, alkylsulfonyl, alkylsulfinyl, arylsulfonyl, arylsulfinyl, aminosulfonyl, SR5 and acyl, each of which may be optionally substituted.
[0060] In one embodiment R28 is selected from the group consisting of H, alkyl, alkenyl, arylalkyl and arylacyl. Specific values of R28 are H, methyl; ethyl;
propyl; 2-methyl-propyl, 2-2-dimethyl-propyl; isopropyl; 3,3,3-triflouro-propyl; butyl;
isobutyl; 3,3-, dimethyl-butyl; pentyl; 2,4,4-trimethyl-pentyl; penten-4-yl, hexyl;
heptyl, octyl, nonyl, 2-methoxy nonyl, benzyl, 2-phenyl-ethyl, 2-phenyl-acetyl, 3-phenyl-propyl, [0061] In another embodiment the heterocycloalkyl group is pyrrolidyl, tetrahydrofuryl, tetrahydrothiofuranyl, piperidyl, piperazyl, tetrahydropyranyl, morphilino, 1,3-diazapane, 1,4-diazapane, 1,4-oxazepane, and 1,4-oxathiapane. It is particularly preferred that R1 is selected from the group consisting of piperidine-3-yl, piperidine-4-y1 and pyrollidin-3-y.
[0062] In another embodiment R1 is a heteroaryl group.
[0063] In another embodiment R1 is a group selected from the group consisting of:
(32.4.N
N
(32.2 N N
N La?7- N N
NH
,CNH
N
NH

N
N
N N N

NH
N

N
[0064] In one specific embodiment R1 is a group of formula:
'Z'etNH2 [0065] In another specific embodiment R1 is a group of formula:

[0066] In another specific embodiment R1 is a group of formula:
[0067] In yet another specific embodiment R1 is a group of formula:
[0068] In another specific embodiment R1 is a group of formula:
N/
[0069] In another specific embodiment R1 is a group of formula:
N/
[0070] In another specific embodiment R1 is a group of formula:
[0071] In another specific embodiment R1 is a group of formula:

[0072] In another specific embodiment R1 is a group of formula:
Lh2,N
[0073] In one embodiment R2 is selected from the group consisting of H, alkyl, cycloalkyl, heteroalkyl, alkenyl, alkynyl, alkoxyalkyl and cycloalkylalkyl.
[0074] In one form of this embodiment R2 is alkyl. In one embodiment the alkyl is a C1-C10 alkyl. In anotherform of this embodiment the alkyl is a C,-C6 alkyl group. In another form of this embodiment R2 is selected from the group consisting of:
methyl;
ethyl; propyl; 2-methyl-propyl, 2-2-dimethyl-propyl; isopropyl; 3,3,3-triflouro-propyl;
butyl; isobutyl; 3,3-dimethyl-butyl; pentyl; 2,4,4-trimethyl-pentyl; hexyl;
heptyl, octyl, nonyl, and 2-methoxy nonyl.
[0075] In one form of this embodiment R2 is alkenyl. In one form of this embodiment the alkenyl is y a Ci-Cio alkeny. In another form of this embodiment the alkenyl is a C1-C6 alkenyl group. In another form of this embodiment R2 is selected from the group consisting of: ethenyl, prop-1-enyl, prop-2-enyl, but-l-enyl, but-2-enyl but-3-enyl, pent-1-enyl, pent-2-enyl, pent-3-enyl, pent-4-enyl, hex-1-enyl, hex-2-enyl, hex-3-enyl, hex-4-enyl and hex-5-enyl.
[0076] In another embodiment R2 is selected from the group consisting of R11S(0)R13-, R11S(0)2R13-, R11c(o)N(R12)R13-, R11S02N(R12)R13-, R11N(R12)C(0)R13-, R11N(R12)S02R13-, and RN(R12)C(0)N(R12)R13-. In one form of this embodiment R2 is a group of the formula R11C(0)N(R12)R13-. In one form of this embodiment R13 is a Cr 06 alkyl. In a specific form of this embodiment R13 is methyl or ethyl. In one form of thsi embodiment R12 is H or C1-C6alkyl. A specific value for R12 is H. In one form of thsi embodiment R11 is 01-06 alkyl group. Specific values for R11 include t-butyl and propyl.
. Specific examples of groups of this type include: (CH3)3CCH2CONH(CH2)2-;
(CH3)3CCONH(CH2)2-; (CH3)3CCONH(CH2)- and CH3(CH2)2CONH(CH2)-=
[0077] Specific values of R2 are Selected from the group consisting of: H;
methyl;
ethoxymethyl; [Bicylco[2.2.1]2-ylmethyl; Adamantan-2-ylmethyl; 2-methansulfanyl-ethyl; 2,2,2-triflouro-ethyl; propyl; 2-2-dimethyl-propyl; isopropyl; 3,3,3-trifiouro-propyl;
butyl; isobutyl; 3,3-dimethyl-butyl; but-3-enyl; but-3-yny; pentyl; 2,4,4-trimethyl-pentyl;
Bicyclo[2.2.1]hept-5-en-2y1; hexyl; hex-3-enyl; octyl; non-3-enyl; non-6-enyl;

methoxy-nonyl, 2-phenyl-cyclopropyl; cyclohexyl; (CH3)3CCH2CONH(CH2)2-;
(CH3)3CCONH(CH2)2-; (CF13)3CCONH(CH2)- and CH3(0H2)2CONH(CH2)-=
[0078] In one embodiment X and Y may be the same or different and are selected from the group consisting of H, halogen, 01-04 alkyl, -CF3, -NO2, -C(0)R5, -SR6, -ON and NR7R8.
[0079] In one embodiment X is H;
[0080] In one embodiment Y is H;
[0081] In one embodiment X and Y (if present) are at the 4 and 7 positions of the aromatic ring.
[0082] In one embodiment R3 is H, C1-C6 alkyl, or acyl. In another embodiment R3 is H or C1-C4 alkyl. A specific value for R3 is H;
[0083] In one embodiment R4 is H or C1-C4 alkyl. A specific value for R4 is H;
[0084] In one embodiment R5 is C1-C4 alkyl, heteroalkyl, or acyl. A specific value for R5 is methyl;
[0085] In one embodiment R5 is C1-C4 alkyl, heteroalkyl or acyl. A specific value for R5 is 01-04 alkyl;

10086] In one embodinnentR7 and R5 are selected from the group consisting of H, C1-C6 alkyl, C4-C9cycloalkyl, C4-C9heterocycloalkyl, aryl, heteroaryl, arylalkyl, and heteroarylalkyl [0087] Many if not all of the variables discussed above may be optionally substituted.
If the variable is optionally substituted then in one embodiment the optional substituent is selected from the group consisting of: halogen, =0, =S, -CN, -NO2, -CF3, -0CF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkoxyheteroaryl, alkenyloxy, alkynyloxy, cycloalkyloxy, cycloalkenyloxy, heterocycloalkyloxy, heterocycloalkenyloxy, aryloxy, heteroaryloxy, arylalkyl, heteroarylalkyl, arylalkyloxy, -amino, alkylamino, acylamino, aminoalkyl, arylamino, sulfonyl, alkylsulfonyl, arylsulfonyl, aminosulfonyl, aminoalkyl, alkoxyalky, -COOH, -COR5, -C(0)0R5, -SH, -SR5, -0R6and acyl;
[0088] In a further embodiment the optional substituents are selected from the group consisting of: halogen, =0, =S, -CN, -NO2, alkyl, alkenyl, heteroalkyl, haloalkyl, alkynyl, aryl, cycloalkyl, heterocycloalkyl, heteroaryl, hydroxy, hydroxyalkyl, alkoxy, alkylamino, aminoalkyl, acylamino, phenoxy, alkoxyalkyl, benzyloxy, alkylsulfonyl, arylsulfonyl, aminosulfonyl, -C(0)0R5, COOH, SH, and acyl.
[0089] In one embodiment the Z moiety is at the 5 or 6 position. In a specific embodiment the Z moiety is at the 5 position. In one embodiment the Z moiety is a group of formula -CH=CH-. If the Z moiety is a group of this type it is preferably in the "E" configuration.
[0090] In addition to compounds of Formula (I), the embodiments disclosed are also directed to pharmaceutically acceptable salts, pharmaceutically acceptable prodrugs, and pharmaceutically active metabolites of such compounds, and pharmaceutically acceptable salts of such metabolites. Such compounds, salts, prodrugs and metabolites are at times collectively referred to herein as "HDAC inhibiting agents" or "HDAC inhibitors".
[0091] The invention also relates to pharmaceutical compositions including a compound of the invention with a pharmaceutically acceptable carrier, diluent or excipient.

[0092] In yet a further aspect the present invention provides a method of treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis including administration of a therapeutically effective 5 amount of a compound of formula (I). The embodiments disclosed also relate to pharmaceutical compositions each comprising a therapeutically effective amount of a HDAC inhibiting agent of the embodiments described with a pharmaceutically acceptable carrier or diluent for treating cellular proliferative ailments, e.g., inhibition of proliferation of malignant cancer cells, benign tumor cells or other proliferative cells.
[0093] In one embodiment the method includes administration of a compound of formula (la) or (lb) as described herein.
[0094] In one embodiment the disorder is selected from the group consisting of but not limited to cancer (e.g. breast cancer, colon cancer, prostate cancer, pancreatic cancer, leukemias, lymphomas, ovarian cancers, neuroblastomas, melanoma, inflammatory diseases/immune system disorders, angiofibroma, cardiovascular diseases (e.g. restenosis, arteriosclerosis), fibrotic diseases (e.g. liver fibrosis), diabetes, autoimmune -diseases, chronic and acute neurodegenerative disease like .
disruptions of nerval tissue, Huntington's disease and infectious diseases like fungal, bacterial and viral infections. In another embodiment the disorder is a proliferative disorder. In one embodiment the proliferative disorder is cancer. The cancer can include solid tumors or hematologic malignancies.
[0095] The invention also provides agents for the treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis including a compound of formula (1) as disclosed herein. In one embodiment the agent is an anti-cancer agent. In another embodiment the agent is an anti-angiogenesis agent.
[0096] In one embodiment the agent contains a compound of formula (la) or (lb).
[0097] The invention also relates to the use of compounds of formula (I) in the preparation of a medicament for the treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis. In one embodiment the disorder is a proliferative disorder. In a specific embodiment the disorder is a cancer.

[0098] The compounds of the present invention surprisingly show low toxicity, together with a potent anti-proliferative activity.
[0099] In yet a further embodiment the invention provides a method of treatment of a disorder, disease or condition that can be treated by the inhibition of histone deacetylase including administration of a therapeutically effective amount of a compound of formula (I).
[0100] In one embodiment the method includes administration of a compound of formula (la) or (lb) as described herein.
[0101] In one embodiment the disorder is selected from the group consisting of but not limited to Proliferative disorders (e.g. cancer); Neurodegenerative diseases including Huntington's Disease, Polyglutamine diseases, Parkinson's Disease, Alzheimer's Disease, Seizures, Striatonigral degeneration, Progressive supranuclear palsy, Torsion dystonia, Spasmodic torticollis and dyskinesis, Familial tremor, Gilles de la Tourette syndrome, Diffuse Lewy body disease, Pick's disease, Intracerebral haemorrhage Primary lateral sclerosis, Spinal muscular atrophy, Amyotrophic lateral sclerosis, Hypertrophic interstitial polyneuropathy, Retinitis pigmentosa, Hereditary optic atrophy, Hereditary spastic paraplegia, Progressive ataxia and Shy-Drager syndrome; Metabolic diseases including Type 2 diabetes; Degenerative Diseases of the Eye including Glaucoma, Age-related macular degeneration, macular myopic degeneration, Rubeotic glaucoma, Interstitial keratitis, Diabetic retinopathy, Peters anomaly retinal degeneration, Cellophane Retinopathy; Cogan's Dystrophy;
Corneal Dystrophy; Iris Neovascularization (Rubeosis); Neovascularization of the Cornea;
Retinopathy of Prematurity; Macular Edema; Macular Hole; Macular Pucker;
Marginal Blepharitis, Myopia, nonmalignant growth of the conjunctiva; Inflammatory diseases and/or Immune system disorders including Rheumatoid Arthritis (RA), Osteoarthritis, Juvenile chronic arthritis, Graft versus Host disease, Psoriasis, Asthma, Spondyloarthropathy, Crohn's Disease, inflammatory bowel disease, Colitis Ulcerosa, Alcoholic hepatitis, Diabetes, Sjoegrens's syndrome, Multiple Sclerosis, Ankylosing spondylitis, Membranous glomerulopathy, Discogenic pain, Systemic Lupus Erythematosus, allergic contact dermatitis; Disease involving angiogenesis including cancer, psoriasis, rheumatoid arthritis; Psychological disorders including bipolar disease, schizophrenia, depression and dementia; Cardiovascular Diseases including Heart failure, restenosis, cardiac hypertrophy and arteriosclerosis; Fibrotic diseases including liver fibrosis, lung fibrosis, cystic fibrosis and angiofibroma;
Infectious diseases including Fungal infections, such as Candida Albicans, Bacterial infections, Viral infections, such as Herpes Simplex, Protozoal infections, such as Malaria, Leishmania infection, Trypanosoma brucei infection, Toxoplasmosis and coccidiosis, and Haematopoietic disorders including thalassemia, anemia and sickle cell anemia.
[0102] The invention also provides agents for the treatment of a disorder, disease or condition that can be treated by the inhibition of histone deacetylase including a compound of formula (I) as disclosed herein. In one embodiment the agent is an anti-cancer agent.
[0103] The invention also relates to the use of compounds of formula (I) in the preparation of a medicament for the treatment of a disorder, disease or condition that can be treated by the inhibition of histone deacetylase.
[0104] The invention also provides a method for inhibiting cell proliferation including administration of an effective amount of a compound according to formula (I).
[0105] In yet an even further aspect the invention provides a method of treatment of a neurodegenerative disorder in a patient including administration of a therapeutically effective amount of a compound of formula (I). In one embodiment the method includes administration of a compound of formula (la) or (lb) as described herein. In one embodiment the neurodegenerative disorder is Huntington's Disease.
[0106] The invention also provides agents for the treatment of neurodegenerative disorder including a compound of formula (I) as disclosed herein. In one embodiment the agent is preferably anti-Huntington's disease agent.
[0107] The invention also relates to the use of compounds of formula (I) in the preparation of a medicament for the treatment of a neurodegenerative disorder.
In one embodiment the neurodegenerative disorder is Huntington's Disease.
[0108] In yet an even further aspect the invention provides a method of treatment of an inflammatory disease and/or immune system disorder in a patient including administration of a therapeutically effective amount of a compound of formula (1). In one embodiment the method includes administration of a compound of formula (la) or (lb) as described herein. In one embodiment the inflammatory disease and/or immune system disorder is rheumatoid arthritis. In another embodiment the inflammatory disease and/or immune system disorder is Systemic Lupus Erythematosus.
[0109] The invention also provides agents for the treatment of inflammatory disease 5 and/or immune system disorder including a compound of formula (I) as disclosed herein.
[0110] The invention also provides agents for the treatment of eye disease mediated by HDAC inhibition including a compound of formula (I) as disclosed herein. In one 10 embodiment, the eye disease is macular degeneration. In another embodiment, the eye disease is glaucoma. In another embodiment, the eye disease is retinal degeneration.
[0111] The invention also relates to the use of compounds of formula (I) in the 15 preparation of a medicament for the treatment of inflammatory disease and/or immunesystem disorder. In one embodiment the inflammatory disease and/or immune system disorder is rheumatoid arthritis. In another embodiment the inflammatory disease and/or immune system disorder is Systemic Lupus Erythematosus.
[0111a] In accordance with an aspect of the present invention there is provided a compound of the formula (I):
X

R2 ___________________ < 0-R4 N

Formula I
wherein R1 is a group of formula:
_( CR20-R 21 )õ,-( cR22R2),-(CR24R25 )0_NR26R27;
R2 is selected from the group consisting of: alkyl and heteroalkyl, each of which may be optionally substituted with one or more optional substituents wherein 23a each optional substituent is selected from the group consisting of halogen, =0, -CN, alkenyl, alkynyl and alkoxy;
R3 is H;
X and Y are H;
R4 is H;
each R5 is independently selected from the group consisting of: H, alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl, each of which may be optionally substituted;
each R6 is independently selected from the group consisting of: H, alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl;
each of which may be optionally substituted;
each R20, R21, R22, R23, R24 and R25 is independently selected from the group consisting of: H, halogen, -ON, -NO2, -CF3, -0CF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl, arylalkenyl, cycloalkylheteroalkyl, heterocycloalkylheteroalkyl, heteroarylheteroalkyl, arylheteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkoxyheteroaryl, alkenyloxy, alkynyloxy, cycloalkylkoxy, heterocycloalkyloxy, aryloxy, arylalkyloxy, phenoxy, benzyloxy heteroaryloxy, amino, alkylamino, acylamino, aminoalkyl, arylamino, alkoxycarbonyl, alkylaminocarbonyl, sulfonyl, alkylsulfonyl, aminosulfonyl, arylsulfonyl, arylsulfinyl -COOH, -C(0)0R5, -COR5, -SH, -SR6, -0R6 and acyl, each of which may be optionally substituted;
or R2 and R21 when taken together may form a group of formula =0 or =S, and/or R22 and R23 when taken together may form a group of formula =0 or =S, and/or R24 and R25 when taken together may form a group of formula =0 or =S;

23b each R26 and R27 is independently selected from the group consisting of: H, halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl, arylalkenyl, cycloalkylheteroalkyl, heterocycloalkylheteroalkyl, heteroarylheteroalkyl, arylheteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkenyloxy, alkynyloxy, cycloalkylkoxy, heterocycloalkyloxy, aryloxy, arylalkyloxy, heteroaryloxy, amino, alkylamino, aminoalkyl, acylamino, arylamino, phenoxy, benzyloxy, COOH, alkoxycarbonyl, alkylaminocarbonyl, sulfonyl, alkylsulfonyl, alkylsulfinyl, arylsulfonyl, arylsulfinyl, aminosulfonyl, SR5, and acyl, each of which may be optionally substituted, or R26 and R27 when taken together with the nitrogen atom to which they are attached form an optionally substituted heterocycloalkyl group;
m, n and o are integers independently selected from the group consisting of 0, 1, 2, 3 and 4;
Z is ¨CH=CH- and is attached at ring position 5;
or a pharmaceutically acceptable salt thereof.
DETAILED DESCRIPTION OF THE INVENTION
[0112] In this specification a number of terms are used which are well known to a skilled addressee. Nevertheless for the purposes of clarity a number of terms will be defined.
[0113] As used herein, the term unsubstituted means that there is no substituent or that the only substituents are hydrogen.
[0114] The term "optionally substituted" as used throughout the specification denotes that the group may or may not be further substituted or fused (so as to form a condensed polycyclic system), with one or more substituent groups. Preferably the substituent groups are one or more groups independently selected from the group consisting of halogen, =0, =S, -CN, -NO2, -CF3, -0CF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalylalkyl, heterocycloalkylalkyl, heteroarylalkyl, arylalkyl, cycloalkylalkenyl, heterocycloalkylalkenyl, arylalkenyl, heteroarylalkenyl, cycloalkylheteroalkyl, heterocycloalkyiheteroalkyl, arylheteroalkyl, heteroarylheteroalkyl, hydroxy, 23c sulfonyl, alkylsulfonyl, alkylsulfinyl, arylsulfonyl, arylsulfinyl, aminosulfonyl, SR5, and acyl, each of which may be optionally substituted, or R26 and R27 when taken together with the nitrogen atom to which they are attached form an optionally substituted heterocycloalkyl group;
m, n and o are integers independently selected from the group consisting of 0, 1, 2, 3 and 4;
or a pharmaceutically acceptable salt or prod rug thereof.
DETAILED DESCRIPTION OF THE INVENTION
[0112] In this specification a number of terms are used which are well known to a skilled addressee. Nevertheless for the purposes of clarity a number of terms will be defined.
[0113] As used herein, the term unsubstituted means that there is no substituent or that the only substituents are hydrogen.
[0114] The term "optionally substituted" as used throughout the specification denotes that the group may or may not be further substituted or fused (so as to form a condensed polycyclic system), with one or more substituent groups. Preferably the substituent groups are one or more groups independently selected from the group consisting of halogen, =0, =S, -CN, -NO2, -CF3, -0CF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalylalkyl, heterocycloalkylalkyl, heteroarylalkyl, arylalkyl, cycloalkylalkenyl, heterocycloalkylalkenyl, arylalkenyl, heteroarylalkenyl, cycloalkylheteroalkyl, heterocycloalkyiheteroalkyl, arylheteroalkyl, heteroarylheteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxycycloalkyl, alkoxyheterocycloalkyl, alkoxyaryl, alkoxyheteroaryl, alkoxycarbonyl, alkylaminocarbonyl, alkenyloxy, alkynyloxy, cycloalkyloxy, cycloalkenyloxy, heterocycloalkyloxy, heterocycloalkenyloxy, aryloxy, phenoxy, benzyloxy, heteroaryloxy, arylalkyloxy, arylalkyl, heteroarylalkyl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyloxy, amino, alkylamino, acylamino, aminoalkyl, arylamino, sulfonylamino, sulfinylamino, sulfonyl, alkylsulfonyl, arylsulfonyl, aminosulfonyl, sulfinyl, alkylsulfinyl, arylsulfinyl, aminosulfinylaminoalkyl, -COOH, -COR5, -C(0)0R5, CONHR5, NHCOR5, NHCOOR5, NHCONHR5, C(=NOH)R5, -SH, -SR5, -0R5 and acyl.
[0115] "Alkyl" as a group or part of a group refers to a straight or branched aliphatic hydrocarbon group, preferably a C1¨C14 alkyl, more preferably C1-C10 alkyl, most preferably C1-C6 unless otherwise noted. Examples of suitable straight and branched C1-C6 alkyl substituents include methyl, ethyl, n-propyl, 2-propyl, n-butyl, sec-butyl, t-butyl, hexyl, and the like.
[0116] "Alkylamino" includes both monoalkylamino and dialkylamino, unless specified. "Monoalkylamino" means a ¨NH-Alkyl group, in which alkyl is as defined above. "Dialkylamino" means a ¨N(alkyl)2 group, in which each alkyl may be the same or different and are each as defined herein for alkyl. The alkyl group is preferably a C1-C6 alkyl group.
[0117] "Alkylamino" includes both monoalkylamino and dialkylamino, unless specified. "Monoalkylamino" means a ¨NH-Alkyl group in which alkyl is as defined above. "Dialkylamino" means a ¨N(alkyl)2 group in which each alkyl may be the same or different and are each as defined herein for alkyl. The alkyl group is preferably a C6 alkyl group.
[0118] "Arylamino" includes both mono-arylamino and di-arylamino unless specified.
Mono-arylamino means a group of formula aryl NH-, in which aryl is as defined herein.
di-arylamino means a group of formula (ary12) N- where each aryl may be the same or different and are each as defined herein for aryl.
[0119] "Acyl" means an alkyl-CO- group in which the alkyl group is as described herein. Examples of acyl include acetyl and benzoyl. The alkyl group is preferably a Cr C6 alkyl group.

[0120] "Alkenyl" as a group or part of a group denotes an aliphatic hydrocarbon group containing at least one carbon-carbon double bond and which may be straight or branched preferably having 2-14 carbon atoms, more preferably 2-12 carbon atoms, most preferably 2-6 carbon atoms, in the normal chain. The group may contain a 5 plurality of double bonds in the normal chain and the orientation about each is independently E or Z. Exemplary alkenyl groups include, but are not limited to, ethenyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl and nonenyl.
[0121] "Alkoxy" refers to an ¨0-alkyl group in which alkyl is defined herein.
10 Preferably the alkoxy is a C1-C6alkoxy. Examples include, but are not limited to, nnethoxy and ethoxy.
[0122] "Alkenyloxy" refers to an -0- alkenyl group in which alkenyl is as defined herein. Preferred alkenyloxy groups are C1-C6alkenyloxy groups.
[0123] "Alkynyloxy" refers to an ¨0-alkynyl group in which alkynyl is as defined herein. Preferred alkynyloxy groups are C1-C6alkynyloxy groups.
[0124] "Alkoxycarbonyl" refers to an ¨C(0)-0-alkyl group in which alkyl is as defined herein. The alkyl group is preferably a C1-C6 alkyl group. Examples include, but not limited to, methoxycarbonyl and ethoxycarbonyl.
[0125] "Akylsulfinyl" means a ¨S(0)-alkyl group in which alkyl is as defined above.
The alkyl group is preferably a C1-C6 alkyl group. Exemplary alkylsulfinyl groups include, but not limited to, methylsulfinyl and ethylsulfinyl.
[0126] "Alkylsulfonyl" refers to a ¨S(0)2-alkyl group in which alkyl is as defined above. The alkyl group is preferably a C1-C6 alkyl group. Examples include, but not limited to methylsulfonyl and ethylsulfonyl.
[0127] "Alkynyl as a group or part of a group means an aliphatic hydrocarbon group containing a carbon-carbon triple bond and which may be straight or branched preferably having from 2-14 carbon atoms, more preferably 2-12 carbon atoms, more preferably 2-6 carbon atoms in the normal chain. Exemplary structures include, but are not limited to, ethynyl and propynyl.

[0128] "Alkylaminocarbonyl" refers to an alkylamino-carbonyl group in which alkylamino is as defined above.
[0129] "Cycloalkyl" refers to a saturated or partially saturated, monocyclic or fused or spiro polycyclic, carbocycle preferably containing from 3 to 9 carbons per ring, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and the like, unless otherwise specified.
It includes monocyclic systems such as cyclopropyl and cyclohexyl, bicyclic systems such as decalin, and polycyclic systems such as adamantane.
[0130] "Cycloalkenyl" means a non-aromatic monocyclic or multicyclic ring system containing at least one carbon-carbon double bond and preferably having from 5-carbon atoms per ring. Exemplary monocyclic cycloalkenyl rings include cyclopentenyl, cyclohexenyl or cycloheptenyl. The cycloalkenyl group may be substituted by one or more substituent groups.
[0131] The above discussion of alkyl and cycloalkyl substituents also applies to the alkyl portions of other substituents, such as without limitation, alkoxy, alkyl amines, alkyl ketones, arylalkyl, heteroarylalkyl, alkylsulfonyl and alkyl ester substituents and the like.
[0132] "Cycloalkylalkyl" means a cycloalkyl-alkyl- group in which the cycloalkyl and alkyl moieties are as previously described. Exemplary monocycloalkylalkyl groups include cyclopropylmethyl, cyclopentylmethyl, cyclohexylmethyl and cycloheptylmethyl.
[0133] "Halogen" represents chlorine, fluorine, bromine or iodine.
[0134] "Heterocycloalkyl" refers to a saturated or partially saturated monocycli, bicyclic, or polycyclic ring containing at least one heteroatom selected from nitrogen, sulfur, oxygen, preferably from 1 to 3 heteroatoms in at least one ring. Each ring is preferably from 3 to 10 membered, more preferably 4 to 7 membered. Examples of suitable heterocycloalkyl substituents include pyrrolidyl, tetrahydrofuryl, tetrahydrothiofuranyl, piperidyl, piperazyl, tetrahydropyranyl, morphilino, 1,3-diazapane, 1,4-diazapane, 1,4-oxazepane, and 1,4-oxathiapane.
[0135] "Heterocycloalkenyl" refers to a heterocycloalkyl as described above but containing at least one double bond.

[0136] "Heterocycloalkylalkyl" refers to a heterocycloalkyl-alkyl group in which the heterocycloalkyl and alkyl moieties are as previously described. Exemplary heterocycloalkylalkyl groups include (2-tetrahydrofuryl)methyl, (2-tetra hydrothiofura nyl)methyl.
[0137] "Heteroalkyl" refers to a straight- or branched-chain alkyl group preferably having from 2 to 14 atoms, more preferably 2 to 10 atoms in the chain, one or more of which is a heteroatom selected from S, 0, and N. Exemplary heteroalkyls include alkyl ethers, secondary and tertiary alkyl ainines, alkyl sulfides, and the like.
[0138] "Aryl" as a group or part of a group denotes (i) an optionally substituted monocyclic, or fused polycyclic, aromatic carbocycle (ring structure having ring atoms that are all carbon) preferably having from 5 to 12 atoms per ring. Examples of aryl groups include phenyl, naphthyl, and the like; (ii) an optionally substituted partially saturated bicyclic aromatic carbocyclic moiety in which a phenyl and a C5_7 cycloalkyl or C5_7 cycloalkenyl group are fused together to form a cyclic structure, such as tetrahydronaphthyl, indenyl or indanyl.
[0139] "Arylalkenyl" means an aryl-alkenyl- group in which the aryl and alkenyl are as previously described. Exemplary arylalkenyl groups include phenylallyl.
[0140] "Arylalkyl" means an aryl-alkyl- group in which the aryl and alkyl moieties are as previously described. Preferred arylalkyl groups contain a C1.-5 alkyl moiety.
Exemplary arylalkyl groups include benzyl, phenethyl and naphthelenemethyl.
[0141] "Arylacyl" means an aryl-acyl- group in which the aryl and acyl moieties are as previously described. In general the aryl moiety is attached to the alkyl portion of the acyl moiety, typically to the terminal carbon of the alkyl portion of the acyl moiety.
Preferred arylacyl groups contain a C1..5 alkyl moiety in the acyl moiety.
Exemplary arylacyl groups include 2-phenyl-acetyl.
[0142] "Heteroaryl" either alone or part of a group refers to groups containing an aomatic ring (preferably a 5 or 6 membererd aromatic ring) having one or more heteroatoms as ring atoms in the aromatic ring with the remainder of the ring atoms being carbon atoms. Suitable heteroatoms include nitrogen, oxygen and sulphur.
Examples of hetreoaryl include thiophene, benzothiophene, benzofuran, benzimidazole, benzoxazole, benzothiazole, benzisothiazole, naphtho[2,3-b]thiophene, furan, isoindolizine, xantholene, phenoxatine, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyrimidine, pyridazine, indole, isoindole, 1H-indazole, purine, quinoline, isoquinoline, phthalazine, naphthyridine, quinoxaline, cinnoline, carbazole, phenanthridine, acridine, phenazine, thiazole, isothiazole, phenothiazine, oxazole, isooxazole, furazane, phenoxazine, 2-,3- or4- pyridyl, 2-, 3-, 4-, 5-, or 8-quinolyl, 1-, 3-, 4-, or 5- isoquinoliny11-, 2-, or 3- indolyl, and 2-, or 3-thienyl.
[0143] "Heteroarylalkyl" means a heteroaryl-alkyl group in which the heteroaryl and alkyl moieties are as previously described. Preferred heteroarylalkyl groups contain a lower alkyl moiety. Exemplary heteroarylalkyl groups include pyridylmethyl.
[0144] "Lower alkyl" as a group means unless otherwise specified, an aliphatic hydrocarbon group which may be straight or branched having 1 to 6 carbon atoms in the chain, more preferably 1 to 4 carbons such as methyl, ethyl, propyl (n-propyl or isopropyl) or butyl (n-butyl, isobutyl or tertiary-butyl).
[0145] In Formula (I), as well as in Formulae (la) ¨ (lb) defining sub-sets of compounds within Formula (I), there is shown a benzimidazole ring system.
Within this ring system, there are substitutable positions at the 4-,5-, 6-, and 7-ring positions. In each of Formulae (I), (la), and (lb), there is a requirement for attachment of an acidic moiety at one of the ring positions. This acidic moiety may be provided by but is not limited to groups containing, a hydroxamic acid or salt derivatives of such acid which when hydrolyzed would provide the acidic moiety. In some embodiments the acidic moiety may be attached to the ring position through an alkylene group such as ¨CH2-or ¨CH2CH2-, or an alkenylene group such as -CH=CH-. Preferred positions for attachment of the acidic moiety are the 5¨ and 6¨ring positions.
[0146] It is understood that included in the family of compounds of Formula (I) are isomeric forms including diastereoisomers, enantiomers, tautomers, and geometrical isomers in "E" or "Z" configurational isomer or a mixture of E and Z isomers.
It is also understood that some isomeric forms such as diastereomers, enantiomers, and geometrical isomers can be separated by physical and/or chemical methods and by those skilled in the art.
[0147] Some of the compounds of the disclosed embodiments may exist as single stereoisomers, racemates, and/or mixtures of enantiomers and /or diastereomers. All such single stereoisomers, racemates and mixtures thereof are intended to be within the scope of the subject matter described and claimed.
[0148] Additionally, Formula (1) is intended to cover, where applicable, solvated as well as unsolvated forms of the compounds. Thus, each formula includes compounds having the indicated structure, including the hydrated as well as the non-hydrated forms.
[0149] In addition to compounds of the Formula (I), the HDAC inhibiting agents of the various embodiments include pharmaceutically acceptable salts, prodrugs, and active metabolites of such compounds, and pharmaceutically acceptable salts of such metabolites.
[0150] The term "Pharmaceutically acceptable salts" refers to salts that retain the desired biological activity of the above-identified compounds, and include pharmaceutically acceptable acid addition salts and base addition salts.
Suitable pharmaceutically acceptable acid addition salts of compounds of Formula (1) may be prepared from an inorganic acid or from an organic acid. Examples of such inorganic acids are hydrochloric, sulfuric, and phosphoric acid. Appropriate organic acids may be selected from aliphatic, cycloaliphatic, aromatic, heterocyclic carboxylic and sulfonic classes of organic acids, examples of which are formic, acetic, propionic, succinic, glycolic, gluconic, lactic, mak, tartaric, citric, fumaric, maleic, alkyl sulfonic, arylsulfonic. Suitable pharmaceutically acceptable base addition salts of compounds of Formula (1) include metallic salts made from lithium, sodium, potassium, magnesium, calcium, aluminium, and zinc, and organic salts made from organic bases such as choline, diethanolamine, morpholine. Other examples of organic salts are:
ammonium salts, quatemary salts such as tetramethylammonium salt; amino acid addition salts such as salts with glycine and arginine. Additional information on pharmaceutically acceptable salts can be found in Remington's Pharmaceutical Sciences, 19th Edition, Mack Publishing Co., Easton, PA 1995. In the case of agents that are solids, it is understood by those skilled in the art that the inventive compounds, agents and salts may exist in different crystalline or polymorphic forms, all of which are intended to be within the scope of the present invention and specified formulae.
[0151] "Prodrug" means a compound which is convertible in vivo by metabolic means (e.g. by hydrolysis, reduction or oxidation) to a compound of formula (I). For example an ester prodrug of a compound of formula (I) containing a hydroxyl group . 30 may be convertible by hydrolysis in vivo to the parent molecule. Suitable esters of compounds of formula (I) containing a hydroxyl group, are for example acetates, citrates, lactates, tartrates, malonates, oxalates, salicylates, propionates, succinates, fumarates, maleates, methylene-bis-f3-hydroxynaphthoates, gestisates, isethionates, di-p-toluoyltartrates, methanesulphonates, ethanesulphonates, benzenesulphonates, p-toluenesulphonates, cyclohexylsulphamates and quinates. As another example an ester prodrug of a compound of formula (1) containing a carboxy group may be convertible by hydrolysis in vivo to the parent molecule. (Examples of ester prodrugs are those described by F. J. Leinweber, Drug Metab. Res.,18:379, 1987).
[0152] Preferred HDAC inhibiting agents include those having an IC50 value of 10 0.4 or less.
[0153] Specific compounds of the invention include the following:
341-(3-Dimethylamino-2,2-dimethyl-propy1)-2-( (2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1]-N-N
hydroxy-acrylamide <
341-(3-Dimethylamino-2,2-dimethyl-propy1)-2-isopropy1-1H-benzoimidazol-5-y1]-N-hydroxy--/ acrylamide 312-Buty1-1-(3-dimethylamino-2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide 3-[1-(3-Dimethylamino-2,2-dimethyl-propyI)-2-(2-io11 nnethylsulfanyl-ethyl)-1H-benzoimidazol-5-A-N-- ________________________________ hydroxy-acrylamide OH
3-[1-(3-Dimethylamino-2,2-dimethyl-propy1)-2-ethoxyrnethy1-1H-benzoimidazol-5-y1]-N-N hydroxy-acrylamide /N

3-[1-(3-Dimethylamino-2,2-dimethyl-propy1)-2-( N.
isobuty1-1H-benzoimidazol-5-y1]-N-hydroxy-N
a cryla m ide 3-[1-(2-Diethylamino-ethyl)-2-isobuty1-1H-( __ c" 40 benzoimidazol-5-y1]-N-hydroxy-acrylamide r-N) 342-Buty1-1-(2-diethylamino-ethyl)-1H-\ 10 N
benzoimidazol-5-y1FN-hydroxy-acrylamide r-N) 312-But-3-yny1-1-(3-dimethylamino-2,2-dimethyl-\ 40 propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-N
acrylamide H OH 342-But-3-eny1-1-(3-dimethylamino-2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1]-N-.
hydroxy-acrylamide N OH 3-[2-But-3-eny1-1-(2-diethylamino-ethyl)-1H-iobenzoimidazol-5-y1]-N-hydroxy-acrylamide r-N) 342-But-3-yny1-1-(2-diethylamino-ethyl)-1H-- ______ 10 0E1 benzoimidazol-5-y11-N-hydroxy-acrylamide r-N) HNcm 341-(3-Dimethylamino-2,2-d imethyl-propy1)-2-\ (3,3,3-trifluoro-propy1)-1H-benzoirnidazol-5-y1]-N-hydroxy-acrylamide HN
F 3-[1-(2-Diethylaminc-ethyl)-2-(3,3,3-trifluoro-F F o propyl)-1 H-benzoimidazol-5-y1]-N-hydroxy-N acrylamide õN H 341-(2-Diethylamino-ethyl)-2-ethoxymethy1-1 H-\ _____ o<

N
40 benzoimidazol-5-y1FN-hydroxy-acrylamide HN/ H 3-[1-(3-Dimethylamino-2,2-dimethyl-propyI)-2-0 methyl-1 H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (6, 341-(2-Diethylamino-ethyl)-2-(2,2-dimethyl-NH
,CH propyI)-1 H-benzoimidazol-5-y1]-N-hydroxy-N
acrylamide r) N! N-Hydroxy-311-(3-isopropylamino-propy1)-2-(3,3, 3-trifluoro-propy1)-1 H-benzoimidazo1-5-y1]-N acrylamide o 3-[2-(2,2-Dimethyl-propyI)-1-(2-isopropylamino-ethyl)-1H-benzoimidazol-5-y1]-N-hydroxy-N
acrylamide / NH

341-(2-Diisopropylamino-ethyl)-2-(2,2-dimethyl-propy1)-1H-benzoimidazol-5-A-N-hydroxy-N
acrylamide 341-(2-Diisopropylamino-ethyl)-2-isobuty1-1 H-benzoimidazol-5-y1]-N-hydroxy-acrylamide 311-(3-Dimethylamino-2,2-dimethyl-propy1)-2-/ <
hex-3-eny1-1H-benzoimidazol-5-A-N-hydroxy-acrylamide 3-[1-(3-Dimethylamino-2,2-dimethyl-propyI)-2-io(2,4,4-trimethyl-penty1)-1H-benzoimidazol-5-y11-7& ( N-hydroxy-acrylamide /N
o 312-Cyclohexy1-1-(3-dimethylamino-2,2-(JRNN = dimethyl-propy1)-1H-benzoimidazol-5-y1]-N-\N-- hydroxy-acrylamide 342-Bicyclo[2.2.1]hept-5-en-2-y1-1-(3-; dimethylamino-2,2-dimethyl-propyI)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide 341-(2-Diethylamino-ethyl)-2-hex-3-eny1-1 H-/ 40 benzoimidazol-5-y9-N-hydroxy-acrylamide rN) 341-(2-Diisopropylamino-ethyl)-2-hex-3-eny1-1 / ___ NN IP IHN benzoimidazol-5-y1FN-hydroxy-acrylamide N)"
342-Hex-3-eny1-1-(2-isopropylamino-ethyl)-1 N
= benzoimidazol-5-y1FN-hydroxy-acrylamide 342-Hex-3-eny1-1-(3-isopropylamino-propy1)-1 benzoimidazol-5-y1]-N-hydroxy-acrylamide 3-[1-(2-Ethylamino-ethyl)-2-hex-3-eny1-1H-/ NN benzoimidazol-5-y1]-N-hydroxy-acrylamide 3-[1-(2-Diethylamino-ethyl)-2-hexyl-1 H-benzoimidazol-5-yll-N-hydroxy-acrylamide N-Hydroxy-3-[1-(3-isopropylamino-propyI)-2-(2,4,4-trimethyl-penty1)-1H-benzoimidazol-5-y1]-N acrylamide 3-[2-(2,2-Dimethyl-propyI)-1-(3-isopropylamino-propyI)-1 H-benzoimidazol-5-y1FN-hydroxy-N
acrylamide ,11 1" 341-(2-Diisopropylamino-ethyl)-2-(3,3,3-trifluoro-propyI)-1 H-benzoimidazol-5-y1]-N-hydroxy-F 111 acrylamide F

N-Hydroxy-3[2-isobuty1-1 -(2-isopropylamino-K a r ethyl)-1 H-benzoimidazol-5-y1]-acrylamide N ''Illre-/ NH

342-(2,2-Dimethyl-propy1)-1 -(2-ethylamino-)( 0 ethyl)-1H-benzoimidazol-5-y11-N-hydroxy-. 'P
\-- , acrylamide 341 -(2-Ethylami no-ethyl)-2-isobuty1-1 H-K a TH benzoimidazol-5-y1]-N-hydroxy-acrylamide HN
) 341 -(2-Diisopropylamino-ethyl)-2-(2,4,4-( <
r HO trimethyl-pentyI)-1 H-benzoi midazol-5-yll-N-hydroxy-acrylamide )N)--.
N-Hydroxy-341-(2-isopropylamino-ethyl)-2-( < 10 : (2,4,4-trimethyl-pentyI)-1 H-benzoimidazol-5-y1J-N
)---- acrylamide N
3-[1-(2-Ethylamino-ethyl)-2-(2,4,4-trimethyl-. (I\ pentyI)-1 H-benzoimidazol-5-y1]-N-hydroxy-NH--- .1" acrylamide 341 -(2-Diethylamino-ethyl)-2-(2,4,4-trimethyl-(N 41 \ pentyI)-1 H-benzoimidazo1-5-y1]-N-hydroxy-/) H''' acrylamide 341 -(2-Diethylamino-ethyl)-2-propy1-1 H-benzoimidazol-5-y1]-N-hydroxy-acrylamide , 1"7,y" 40 \ -,,,,, /'---312-Buty1-1-(2-diisopropylamino-ethyl)-1H-[.
= benzoimidazol-5-y1J-N-hydroxy-acrylamide HO
gp-(2-ethylamino-ethyl)-1 benzoimidazol-5-A-N-hydroxy-acrylamide H
f, 311 -(2-Diethylam ino-ethyl)-2-(2-methylsulfanyl-ethyl)-1H-benzoimidazol-5-y1FN-hydroxy-/ acrylamide o 3[2-Buty1-1-(2-isopropylamino-ethyl)-1 benzoimidazol-5-y1FN-hydroxy-acrylamide / NH

OF1 342-Buty1-1-(3-isopropylamino-propy1)-1H-\
benzoimidazol-5-y1]-N-hydroxy-acrylamide 341-(1-Benzyl-piperidin-4-y1)-2-buty1-1 H-\ 40 benzoimidazol-5-A-N-hydroxy-acrylamide 44, 342-But-3-eny1-1-(2-ethylamino-ethyl)-1 / 40 benzoimidazol-5-y1]-N-hydroxy-acrylamide rNH

3[2-Hexy1-1-(2-isopropylamino-ethyl)-1 H-\
benzoimidazol-5-A-N-hydroxy-acrylamide / NH
)(' 0 341-(2-Dimethylamino-ethyl)-2-(2,4,4-trimethyl-(pentyI)-1 H-benzoimidazol-5-y1]-N-hydroxy-rj acrylamide 341-(2-Ethylamino-ethyl)-2-hexyl-1 H-40 NIH benzoimidazol-5-y11-N-hydroxy-acrylamide N-Hydroxy-3-[1-(2-isopropylamino-ethyl)-2-' I \
(3,3,3-trifluoro-propyI)-1 H-benzoimidazol-5-y1]-N
acrylamide HN\
3-[1-(2-Dimethylamino-ethyl)-2-hex-3-eny1-1 H-/ __ <
ip benzoinnidazol-5-yll-N-hydroxy-acrylamide 3-[1-(2-Amino-ethy1)-2-(2,4,4-trimethyl-penty1)-< 40 OH 1 H-benzoimidazol-5-y1J-N-hydroxy-acrylamide (-7( 112,4 3-[1-(2-Amino-ethyl)-2-(2-methoxy-nony1)-1H-OH /
benzoimidazol-5-y1]-N-hydroxy-acrylamide Hp õAN 342-Buty1-1-(2-dimethylamino-ethyl)-1H-\ vi benzoimidazol-5-y1]-N-hydroxy-acrylamide o 311-(2-Dimethylamino-ethyl)-2-hexy1-1 H-benzoimidazol-5-y1]-N-hydroxy-acrylamide N-{2-[1-(2-Diethylamino-ethyl)-5-(2-"" OH
hydroxycarbamoyl-vinyI)-1 H-benzoimidazol-2-ylj-ethyl)-3,3-dimethyl-butyramide o 3-{1-(2-Diethylamino-ethyl)-242-(2,2-dimethyl-HN¨\ propionylamino)-ethy1]-1 H-benzoimidazol-5-y1}-N
N-hydroxy-acrylamide \
3-{1 -(2-Diethylam ino-ethyl)-2-[(2, 2-dimethyl-r propionylamino)-methy1]-1 H-benzoimidazol-5-y1}-N-hydroxy-acrylamide rN) N-E1-(2-Diethylamino-ethyl)-5-(2-hydroxycarbamoyl-viny1)-1 H-benzoimidazol-2-N
ylmethyli-butyramide 3-[1-(2-ethylamino-ethyl) -2-(3,3-dimethyl-butyI)-____ (N
1 H-benzoimidazol-5-yli-N-hydroxy-acrylamide OH
NH

3-[2-(3,3-Dimethyl-butyI)-1-(2-Dimethylamino-)\ __ ethyl)-1 H-benzoimidazol-5-y1]-N-hydroxy-N
acrylamide ¨4\

341-(2-Dimethylamino-ethyl)-2-penty1-1 H-. 411 \ 0 benzoimidazol-5-y1]-N-hydroxy-acrylamide F ___________ F
3-[1-(2-Dimethylamino-ethyl)-2-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-5-yli-N-hydroxy-N
4100 \0 acrylamide HN-OH
=

N-Hydroxy-341-(5-methy1-1H-pyrazol-3-y1)-2-õ
( 10 : (2,4,4-trimethyl-penty1)-1H-benzoimidazol-5-y9-acrylamide 341-(2-Ethylamino-ethyl)-2-penty1-I H-2 isbenzoimidazol-5-y9-N-hydroxy-acrylamide HN\
342-Butyl-I -pyrrolidin-3-y1-1 H-benzoimidazol-5-ioyI)-N-hydroxy-acrylamide NH

3-(2-Buty1-1-piperidin-4-y1-1H-benzoimidazol-5-yI)-N-hydroxy-acrylamide N

N-Hydroxy-311-(2-isopropylamino-ethyl)-2-, / OH penty1-1H-benzoimidazol-5-y1Facrylamide HN
0 N-Hydroxy-341-(2-methylamino-ethyl)-2-non-, eny1-1H-benzoimidazol-5-y1]-acrylamide __________________ 401 _---NH

N-Hydroxy-341-(2-methylamino-ethyl)-2-non-6-10 eny1-1H-benzoinnidazol-5-y1]-acrylamide io[r H 342-Hexy1-1-(2-methylannino-ethyl)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide N-Hydroxy-3-[1-(2-methylamino-ethyl)-2-pentyl-/ __ <
ioOH
1H-benzoimidazol-5-A-acrylamide "N\
N-Hydroxy-3-[1-(2-methylamino-ethy1)-2-octyl-11101 1H-benzoimidazol-5-y1Facrylamide FIN \

341-(2-Amino-ethyl)-2-octy1-1H-benzoimidazol-TH 5-y11-N-hydroxy-acrylannide 3-{2-Buty1-142-(isopropyl-methyl-amino)-ethy1]-OH / <
1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide 3-{112-(Ethyl-methyl-amino)-ethy1]-2-penty1-1 r(H-ON

benzoimidazol-5-y1}-N-hydroxy-acrylamide r-N\

0,4 3-(2-Hexy1-1-pyrrolidin-3-y1-1H-benzoimidazol-5-yI)-N-hydroxy-acrylamide OH 3[2-Buty1-1-(1-methyl-pyrrolidin-3-y1)-1 H-a N '"W"' benzoimidazol-5-yli-N-hydroxy-acrylamide N\
OH
3-(2-Butyl-1 -piperidin-3-y1-1 H-benzoimidazol-5-a N
yI)-N-hydroxy-acrylamide 0.4 3-(2-Hexy1-1-piperidin-3-y1-1H-benzoimidazol-5-) yI)-N-hydroxy-acrylamide 0 3-(1-{2-[Ethyl-(2-methoxy-ethyl)-amino]-ethyl}-2-N
11101 N-0H penty1-1H-benzoimidazol-5-y1)-N-hydroxy-H
acrylamide 0 3-{2-Butyl-1 42-(ethyl-methyl-amino)-ethy1]-1H-N
H benzoimidazol-5-y1}-N-hydroxy-acrylamide r 0 N-Hydroxy-341-(1-methyl-piperidin-3-y1)-2-OH
r/1 401 penty1-1H-benzoimidazol-5-y1]-acrylamide 0 3-{142-(Ethyl-hexyl-amino)-ethy11-1 benzoimidazol-5-y1}-N-hydroxy-acrylamide 0 3-{142-(Ethyl-pentyl-amino)-ethy1]-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide o 3-{142-(Ethyl-heptyl-amino)-ethy1]-1H-"N N,OH
benzoimidazol-5-y1}-N-hydroxy-acrylamide jj-j-(E)-3-(2-hexy1-1-(1-(2-hydroxyethyl)piperidin-3-NH
\oH yl )- 1 H-benzo[d]imidazol-5-y1)-N-hydroxyacrylamide 3-(2-Buty1-1-{24ethyl-(3-hydroxy-propyl)-amino]-\NOH ethy11-1H-benzoimidazol-5-y1)-N-hydroxy-. acrylamide 3-(1-{2-[Ethyl-(3-hydroxy-propy1)-amino]-ethyll-/
/ ____ < S 2-penty1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide o (E)-N-hydroxy-3-(1 -(1 -phenethylpyrrolidin-3-y1)-1 H-benzo[d]imidazol-5-yl)acrylamide o =(E)-N-hydroxy-3-(1 -(1 -pentylpiperidin-3-y1)-1 N--\N benzo[d]imidazol-5-yl)acrylamide 3-{1-[2-(Butyl-ethyl-amino)-ethy1]-1H-benzoimidazol-5-yll-N-hydroxy-acrylarnide rrN) (E)-N-hydroxy-3-(1-(1-phenethylpiperidin-3-y1)-c,, 1 H-benzo[d]imidazol-5-ypacrylamide o = (E)-N-hydroxy-3-(1-(1-(3-phenylpropyppiperidin-Nc'H
H 3-y1)-1 H-benzo[d]imidazol-5-yl)acrylamide 41, (E)-N-hydroxy-3-(1-(1-(3-phenylpropyl)pyrrolidin-3-y1)-1 H-benzo[d]imidazol-5-yl)acrylamide o 3-{141-(3,3-Dimethyl-buty1)-pyrrolidin-3-y1]-1 H-N = voH
benzoimidazol-5-y1)-N-hydroxy-acrylamide =
0 (E)-3-(1-(2-(diethylamino)ethyl)-1H-N

benzo[djimidazol-5-y1)-N-hydroxyacrylamide rN) - ___________________ õõ 3-[2-(4-Cyano-butyl)-1-(2-diethylamino-ethyl)-\
C'El 1 H-benzoimidazol-5-y1FN-hydroxy-acrylamide o (E)-3-(1-(1-butylpiperidin-3-y1)-1 H-N
benzo[d]imidazol-5-y1)-N-hydroxyacrylamide NH
OH
0 (E)-N-hydroxy-3-(1-(1-(pent-4-enyl)piperidin-3-OH y1)-1 H-benzo[d]imidazol-5-yl)acrylamide (E)-3-(1-(1-(3,3-dimethylbutyl)piperidin-4-y1)-1H-benzo[d]imidazol-5-y1)-N-hydroxyacrylamide tr,ori 3-[1-(2-Diethylamino-ethy1)-2-propylamino-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide O (E)-N-hydroxy-3-(1 -(2-(isopropyl(propyl)amino)ethyl)-1 H-N benzo[d]imidazol-5-ypacrylamide Ny o 3-{142-(Butyl-isopropyl-amino)-ethy1]-1 benzoimidazol-5-y11-N-hydroxy-acrylamide 0 N-Hyd roxy-3-{1 -[2-(isopropyl-pentyl-amino)-OH
ethyI]-1 H-benzoimidazol-5-y1}-acrylamide \\r-N
3-[2-(5-Cyano-penty1)-1-(2-diethylamino-ethyl)-\ 1 H-benzoimidazol-5-y11-N-hydroxy-acrylamide 1:

0 3-(1-{2-[(3,3-Dimethyl-buty1)-ethyl-aminoFethyl}-401 ( H1 H-benzoimidazol-5-y1)-N-hydroxy-acrylamide 0 3-{1-[2-(Ethyl-propyl-am ino)-ethy1]-1 OH
110 benzoimidazol-5-y1}-N-hydroxy-acrylamide 0 N-Hyd roxy-3-(1 -{24isopropyl-(2-methyl-penty1)-OH
amino]-ethyl}-1 H-benzoimidazol-5-y1)-acrylamide o "\r¨N
(E)-N-hydroxy-3-(1-(2-(isopropy1(4,4,4-40, V trifluorobutypamino)ethyl)-1 H-benzo[d]imidazol-N 5-yl)acrylamide F F

3-[1-(3-Dimethylamino-2,2-dimethyl-propyI)-2-OH
1101 propylamino-1 H-benzoinnidazol-5-y1]-N-hydroxy-N acrylamide o 3-{142-(Ethyl-hexyl-amino)-ethy11-2-methyl-1H-i) OH benzoimidazol-5-y1}-N-hydroxy-acrylamide rN
o 3-{142-(Butyl-ethyl-amino)-ethy1]-2-F __ N trifluoromethy1-1H-benzoimidazol-5-y1}-N-NH
hydroxy-acrylamide FrJ

3-{142-(Ethyl-hexyl-amino)-ethy1]-2-F N OH
F __ trifluoromethy1-1H-benzoimidazol-5-y1}-N-FriN hydroxy-acrylamide rN
o (E)-3-(1-(2-(dibutylamino)ethyl)-2-propy1-1H-/,, benzo[d]imidazol-5-y1)-N-hydroxyacrylamide 0 341-(2-Dipropylamino-ethyl)-1H-benzoimidazol-OH
N
5-y1]-N-hydroxy-acrylamide o N-Hydroxy-3-(1-{2-psopropyl-(3-methyl-butyl)-amino]-ethyl}-1 H-benzoimidazol-5-y1)-acrylamide O 3-(1-{2-[(3,3-Dimethyl-buty1)-methyl-amino]-(OH
ethyl}-1 H-benzoimidazol-5-y1)-N-hydroxy-acrylamide N
O 3-(1-{2-[(2-Ethyl-butyl)-methyl-amino]-ethyl}-1 40/ ( H
\N benzoimidazo1-5-y1)-N-hydroxy-acrylamide (E)-3-(1-(2-(bis(3,3-dimethylbutyl)amino)ethyly N,,OH
1 H-benzo[d]imidazol-5-y1)-N-hydroxyacrylamide 0 (E)-3-(1-(2-(diisobutylamino)ethyl)-1H-NVOH benzo[d]imidazol-5-y1)-N-hydroxyacrylamide 0 3-{14243,3-Dimethyl-butylamino)-ethy1]-1 H-N
N/OH
benzoimidazol-5-y1}-N-hydroxy-acrylamide HN

0 N-Hydroxy-3-{1-[2-(methyl-pent-4-enyl-amino)-N SI N/OH
ethyl]-1H-benzoimidazol-5-y1}-acrylamide N
N
, 0 3-(1-{2-[(3,3-Dimethyl-buty1)-propyl-amino]-/) 40 õ, Nõ..õ...OH
N
ethyl}-1 H-benzoimidazol-5-y1)-N-hydroxy-acrylamide 0 3-[1-(3-Dimethylamino-2,2-dimethyl-propyI)-2-OH
\ 110 rr methylsulfanyl-1 H-benzoimidazol-5-y1]-N-N hydroxy-acrylamide N"----/ o 3-{142-(3,3-Dimethyl-butylamino)-ethy1]-2-õ.
propyl-1 H-benzoimidazo1-5-y1}-N-hydroxy-acrylamide \---- 0 34142-(3,3-Dimethyl-butylamino)-ethyl]-2-(2,2-dimethyl-propy1)-1 H-benzoimidazo1-5-y1]-N-7( hydroxy-acrylamide HN
k [1-{2-[Bis-(3,3-dimethyl-butyl)-amino]-ethyl)-2-7( < =
(2,2-dimethyl-propy1)-1H-benzoimidazol-5-A-N-. hydroxy-acrylamide 0 3-{1-[2-(2,2-Dimethyl-propylam ino)-ethyl]-1H-OH
benzoimidazol-511}-N-hydroxy-acrylamide 3-(1-{2-[(2,2-Dimethyl-propyI)-propyl-amino]-ethyll-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide 3-{1 42-(3,3-Dimethyl-butylamino)-ethyl]-2-ethyl-N OH
1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide NH
[0154] The compounds disclosed are hydroxamate compounds containing a hydroxamic acid type moiety in one of the substituents that may be inhibitors of deacetylases, including but not limited to inhibitors of histone deacetylases.
The 5 hydroxamate compounds may be suitable for prevention or treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis when used either alone or together with a pharmaceutically acceptable carrier, diluent or excipient. An example of such a disorder is cancer. .

[0155] Administration of compounds within Formula (I) to humans can be by any of the accepted modes for enteral administration such as oral or rectal, or by parenteral administration such as subcutaneous, intramuscular, intravenous and intradermal routes. Injection can be bolus or via constant or intermittent infusion. The active compound is typically included in a pharmaceutically acceptable carrier or diluent and in an amount sufficient to deliver to the patient a therapeutically effective dose. In various embodiments the inhibitor compound may be selectively toxic or more toxic to rapidly proliferating cells, e.g. cancerous tumors, than to normal cells.
[0156] As used herein the term 'cancer' is a general term intended to encompass the vast number of conditions that are characterised by uncontrolled abnormal growth of cells.
[0157] It is anticipated that the compounds of the invention will be useful in treating various cancers including but not limited to bone cancers including Ewing's sarcoma, osteosarcoma, chondrosarcoma and the like, brain and CNS tumours including acoustic neuronia, neuroblastomas, glioma and other brain tumours, spinal cord tumours, breast cancers, colorectal cancers, advanced colorectal adenocarcinomas, colon cancers, endocrine cancers including adenocortical carcinoma, pancreatic cancer, pituitary cancer, thyroid cancer, parathyroid cancer, thymus cancer, multiple endocrine neoplasma, gastrointestinal cancers including stomach cancer, esophageal cancer, small intestine cancer, Liver cancer, extra hepatic bile duct cancer, gastrointestinal carcinoid tumour, gall bladder cancer, genitourinary cancers including testicular cancer, penile cancer, prostate cancer, gynaecological cancers including cervical cancer, ovarian cancer, vaginal cancer, uterus/endometrium cancer, vulva cancer, gestational trophoblastic cancer, fallopian tube cancer, uterine sarcoma, head and neck cancers including oral cavity cancer, lip cancer, salivary gland cancer, larynx cancer, hypopharynx cancer, orthopharynx cancer, nasal cancer, paranasal cancer, nasopharynx cancer, leukemias including childhood leukemia, acute lymphocytic leukemia, acute myeloid leukemia, chronic lymphocytic leukemia, chronic myeloid leukemia, hairy cell leukemia, acute promyelocytic leukemia, plasma cell leukemia, myelomas, haematological disorders including myelodysplastic syndromes, myeloproliferative disorders, aplastic anemia, Fanconi anemia, Waldenstroms Macroglobulinemia, lung cancers including small cell lung cancer, non-small cell lung cancer, lymphomas including Hodgkin's disease, non-Hodgkin's lymphoma, cutaneous T-cell lymphoma, peripheral T-cell lymphoma, AIDS related Lymphoma, B-cell lymphoma, Burkitt's lymphomaõ eye cancers including retinoblastoma, intraocular melanoma, skin cancers including melanoma, non-melanoma skin cancer, merkel cell cancer, soft tissue sarcomas such as childhood soft tissue sarcoma, adult soft tissue sarcoma, Kaposi's sarcoma, urinary system cancers including kidney cancer, Wilms tumour, bladder cancer, urethral cancer, and transitional cell cancer.

[0158] Exemplary cancers that may be treated by the compounds of the present invention are breast cancer, lung cancer, ovarian cancer, prostate cancer, head and neck cancer, renal cancer (e.g. renal cell carcinoma), gastric cancer, colon cancer, colon cancer, colorectal cancer and brain cancer.
[0159] Exemplary cancers that may be treated by compounds of the present inventions include but are not limited to B-cell lymphoma (e.g. Burkitt's lymphoma), leukemias (e.g. acute promyeiocytiC leukemia), cutaneous T-cell lymphoma (CTCL) and peripheral T-cell lymphoma.
[0160] Exemplary cancers that may be treated by compounds of the present invention include solid tumors and hematologic malignancies. In another embodiment, preferred cancers that may be treated the compounds of the present invention are colon cancer, prostate cancer, hepatoma and ovarian cancer.
[0161] The compounds may also be used in the treatment of a disorder involving, relating to or, associated with dysregulation of histone deacetylase (HDAC).
[0162] There are a number of disorders that have been implicated by or known to be mediated at least in part by HDAC activity, where HDAC activity is known to play a role in triggering disease onset, or whose symptoms are known or have been shown to be alleviated by HDAC inhibitors. Disorders of this type that would be expected to be amenable to treatment with the compounds of the invention include the following but not limited to: Proliferative disorders (e.g. cancer); Neurodegenerative diseases including Huntington's Disease, Polyglutamine diseases, Parkinson's Disease, Alzheimer's Disease, Seizures, Striatonigral degeneration, Progressive supranuclear palsy, Torsion dystonia, Spasmodic torticollis and dyskinesis, Familial tremor, Gilles de la Tourette syndrome, Diffuse Lewy body disease, Pick's disease, Intracerebral haemorrhage Primary lateral sclerosis, Spinal muscular atrophy, Amyotrophic lateral sclerosis, Hypertrophic interstitial polyneuropathy, Retinitis pigmentosa, Hereditary optic atrophy, Hereditary spastic paraplegia, Progressive ataxia and Shy-Drager syndrome; Metabolic diseases including Type 2 diabetes; Degenerative Diseases of the Eye including Glaucoma, Age-related macular degeneration, macular myopic degeneration, Rubeotic glaucoma, Interstitial keratitis, Diabetic retinopathy, Peter's anomaly, retinal degeneration, Cellophane Retinopathy; Cogan's Dystrophy;
Corneal Dystrophy; Iris Neovascularization (Rubeosis); Neovascularization of the Cornea;

Retinopathy of Prematurity; Macular Edema; Macular Hole; Macular Pucker;
Marginal Blepharitis, Myopia, nonmalignant growth of the conjunctiva; Inflammatory diseases and/or Immune system disorders including Rheumatoid Arthritis (RA), Osteoarthritis, Juvenile chronic arthritis, Graft versus Host disease, Psoriasis, Asthma, Spondyloarthropathy, Crohn's Disease, inflammatory bowel disease, Colitis Ulcerosa, Alcoholic hepatitis, Diabetes, Sjoegrens's syndrome, Multiple Sclerosis, Ankylosing spondylitis, Membranous glomerulopathy, Discogenic pain, Systemic Lupus Erythematosus, allergic contact dermatitis; Disease involving angiogenesis including cancer, psoriasis, rheumatoid arthritis; Psychological disorders including bipolar disease, schizophrenia, depression and dementia; Cardiovascular Diseases including Heart failure, restenosis, cardiac hypertrophy and arteriosclerosis; Fibrotic diseases including liver fibrosis, lung fibrosis, cystic fibrosis and angiofibroma;
Infectious diseases including Fungal infections, such as Candida Albicans, Bacterial infections, Viral infections, such as Herpes Simplex, Protozoal infections, such as Malaria, Leishmania infection, Trypanosoma brucei infection, Toxoplasmosis and coccidiosis, and Haematopoietic disorders including thalassemia, anemia and sickle cell anemia.
[0163] In using the compounds of the invention they can be administered in any form or mode which makes the compound bioavailable. One skilled in the art of preparing formulations can readily select the proper form and mode of administration depending upon the particular characteristics of the compound selected, the condition to be treated, the stage of the condition to be treated and other relevant circumstances. We refer the reader to Remingtons Pharmaceutical Sciences, 19th edition, Mack Publishing Co. (1995) for further information.
[0164] The compounds of the present invention can be administered alone or in the form of a pharmaceutical composition in combination with a pharmaceutically acceptable carrier, diluent or excipient. The compounds of the invention, while effective themselves, are typically formulated and administered in the form of their pharmaceutically acceptable salts as these forms are typically more stable, more easily crystallised and have increased solubility.
[0165]The compounds are, however, typically used in the form of pharmaceutical compositions which are formulated depending on the desired mode of administration.
As such in a further embodiment the present invention provides a pharmaceutical composition including a compound of Formula (I) and a pharmaceutically acceptable carrier, diluent or excipient. The compositions are prepared in manners well known in the art.
[0166] The invention in other embodiments provides a pharmaceutical pack or kit comprising one or more containers filled with one or more of the ingredients of the pharmaceutical compositions of the invention. In such a pack or kit can be found a container having a unit dosage of the agent (s). The kits can include a composition comprising an effective agent either as concentrates (including lyophilized compositions), which can be diluted further prior to use or they can be provided at the concentration of use, where the vials may include one or more dosages.
Conveniently, in the kits, single dosages can be provided in sterile vials so that the physician can employ the vials directly, where the vials will have the desired amount and concentration of agent(s). Associated with such container(s) can be various written materials such as instructions for use, or a notice in the form prescribed by a governmental agency regulating the manufacture, use or sale of pharmaceuticals or biological products, which notice reflects approval by the agency of manufacture, use or sale for human administration.
[0167] The compounds of the invention may be used or administered in combination with one or more additional drug (s) that are chemotherapeutic drugs or HDAC
inhibitor drugs and/or procedures (e.g. surgery, radiotherapy) for the treatment of the disorder/diseases mentioned. The components can be administered in the same formulation or in separate formulations. If administered in separate formulations the compounds of the invention may be administered sequentially or simultaneously with the other drug (s).
[0168] In addition to being able to be administered in combination with one or more additional drugs that include chemotherapeutic drugs or HDAC inhibitor drugs the compounds of the invention may be used in a combination therapy. When this is done the compounds are typically administered in combination with each other. Thus one or more of the compounds of the invention may be administered either simultaneously (as ' a combined preparation) or sequentially in order to achieve a desired effect. This is especially desirable where the therapeutic profile of each compound is different such that the combined effect of the two drugs provides an improved therapeutic result [0169] Pharmaceutical compositions of this invention for parenteral injection comprise pharmaceutically acceptable sterile aqueous or nonaqueous solutions, dispersions, suspensions or emulsions as well as sterile powders for reconstitution into sterile injectable solutions or dispersions just prior to use. Examples of suitable aqueous and nonaqueous carriers, diluents, solvents or vehicles include water, ethanol, polyols (such as glycerol, propylene glycol, polyethylene glycol, and the like), 5 and suitable mixtures thereof, vegetable oils (such as olive oil), and injectable organic esters such as ethyl oleate. Proper fluidity can be maintained, for example, by the use of coating materials such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants.

[0170] These compositions may also contain adjuvants such as preservative, wetting agents, emulsifying agents, and dispersing agents. Prevention of the action of microorganisms may be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like.
It may also be desirable to include isotonic agents such as sugars, sodium chloride, and the 15 like.
Prolonged absorption of the injectable pharmaceutical form may be brought about by the inclusion of agents that delay absorption such as aluminium monostearate and gelatin.
[0171] If desired, and for more effective distribution, the compounds can be incorporated into slow release or targeted delivery systems such as polymer matrices, liposomes, and microspheres.
[0172] The injectable formulations can be sterilized, for example, by filtration through a bacterial-retaining filter, or by incorporating sterilizing agents in the form of sterile 25 solid compositions that can be dissolved or dispersed in sterile water or other sterile injectable medium just prior to use.
[0173] Solid dosage forms for oral administration include capsules, tablets, pills, powders, and granules. In such solid dosage forms, the active compound is mixed with 30 at least one inert, pharmaceutically acceptable excipient or carrier such as sodium citrate or dicalcium phosphate and/or a) fillers or extenders such as starches, lactose, sucrose, glucose, mannitol, and silicic acid, b) binders such as, for example, carboxymethylcellulose, alginates, gelatin, polyvinylpyrrolidone, sucrose, and acacia, c) humectants such as glycerol, d) disintegrating agents such as agar-agar, calcium 35 carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate, e) solution retarding agents such as paraffin, f) absorption accelerators such as quaternary ammonium compounds, g) wetting agents such as, for example, cetyl alcohol and glycerol monostearate, h) absorbents such as kaolin and bentonite clay, and i) lubricants such as talc, calcium stearate, magnesium stearate, solid polyethylene glycols, sodium lauryl sulfate, and mixtures thereof. In the case of capsules, tablets and pills, the dosage form may also comprise buffering agents.
[0174] Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like.
[0175] The solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings and other coatings well known in the pharmaceutical formulating art. They may optionally contain opacifying agents and can also be of a composition that they release the active ingredient(s) only, or preferentially, in a certain part of the intestinal tract, optionally, in a delayed manner.
Examples of embedding compositions which can be used include polymeric substances and waxes.
[0176] If desired, and for more effective distribution, the compounds can be incorporated into slow release or targeted delivery systems such as polymer matrices, liposomes, and microspheres.
[0177] The active compounds can also be in microencapsulated form, if appropriate, with one or more of the above-mentioned excipients.
[0178] Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, solutions, suspensions, syrups and elixirs. In addition to the active compounds, the liquid dosage forms may contain inert diluents commonly used in the art such as, for example, water or other solvents, solubilizing agents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, dimethyl formamide, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor, and sesame oils), glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fatty acid esters of sorbitan, and mixtures thereof.
[0179] Besides inert diluents, the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, and perfuming agents.

[0180] Suspensions, in addition to the active compounds, may contain suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminium metahydroxide, bentonite, agar-s agar, and tragacanth, and mixtures thereof.
[0181] Compositions for rectal or vaginal administration are preferably suppositories which can be prepared by mixing the compounds of this invention with suitable non-irritating excipients or carriers such as cocoa butter, polyethylene glycol or a suppository wax which are solid at room temperature but liquid at body temperature and therefore melt in the rectum or vaginal cavity and release the active compound.
[0182] Dosage forms for topical administration of a compound of this invention include powders, patches, sprays, ointments and inhalants. The active compound is mixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives, buffers, or propellants which may be required.
[0183] The term "therapeutically effective amount" or "effective amount" is an amount sufficient to effect beneficial or desired results. An effective amount can be administered in one or more administrations. An effective amount is typically sufficient to palliate, ameliorate, stabilize, reverse, slow or delay the progression of the disease state. A therapeutically effective amount can be readily determined by an attending diagnostician by the use of conventional techniques and by observing results obtained under analogous circumstances. In determining the therapeutically effective amount a number of factors are to be considered including but not limited to, the species of animal, its size, age and general health, the specific condition involved, the severity of the condition, the response of the patient to treatment, the particular compound administered, the mode of administration, the bioavailability of the preparation administered, the dose regime selected, the use of other medications and other relevant circumstances.
[0184] A preferred dosage will be a range from about 0.01 to 300 mg per kilogram of body weight per day. A more preferred dosage will be in the range from 0.1 to 100 mg per kilogram of body weight per day, more preferably from 0.2 to 80 mg per kilogram of body weight per day, even more preferably 0.2 to 50 mg per kilogram of body weight per day. A suitable dose can be administered in multiple sub-doses per day.

[0185] As discussed above, the compounds of the embodiments disclosed inhibit histone deacetylases. The enzymatic activity of a histone deacetylase can be measured using known methodologies [Yoshida M. et al, J. Biol. Chem., 265, (1990), J. Taunton et al, Science 1996 272: 408]. In certain embodiments, the histone deacetylase inhibitor interacts with and/or reduces the activity of more than one known histone deacetylase in the cell, which can either be from the same class of histone deacetylase or different class of histone deacetylase. In some other embodiments, the histone deacetylase inhibitor interacts and reduces the activity of predominantly one histone deacetylase, for example HDAC-1, HDAC-2, HDAC-3 or HDAC-8 which belongs to Class I HDAC enzymes [De Ruijter A.J.M. et al, Biochem. J., 370, (2003)]. HDACs can also target non-histone substrates to regulate a variety of biological functions implicated in disease pathogenesis. These non-histone substrates include Hsp90, a-tubulin, p53, NFkb and HIF1a [Drummond et al., Annu. Rev.
Pharmacol. Toxicol. 45:495 (2004)]. Certain preferred histone deacetylase inhibitors are those that interact with, and/or reduce the activity of a histone deacetylase which is involved in tumorigenesis, and these compounds may be useful for treating proliferative diseases. Examples of such cell proliferative diseases or conditions include cancer (include any metastases), psoriasis, and smooth muscle cell proliferative disorders such as restenosis. The inventive compounds may be particularly useful for treating tumors such as breast cancer, colon cancer, lung cancer, ovarian cancer, prostate cancer, head and/or neck cancer, or renal, gastric, pancreatic cancer and brain cancer as well as hematologic malignancies such as lymphomas and leukemias. In addition, the inventive compounds may be useful for treating a proliferative disease that is refractory to the treatment with other chemotherapeutics; and for treating hyperproliferative condition such as leukemias, psoriasis and restenosis. In other embodiments, compounds of this invention can be used to treat pre-cancer conditions or hyperplasia including familial adenomatous polyposis, colonic adenomatous polyps, myeloid dysplasia, endometrial dysplasia, endometrial hyperplasia with atypia, cervical dysplasia, vaginal intraepithelial neoplasia, benign prostatic hyperplasia, papillomas of the larynx, actinic and solar keratosis, seborrheic keratosis and keratoacanthoma.
[0186] Additionally compounds of the various embodiments disclosed herein may be useful for treating neurodegenerative diseases, and inflammatory diseases and/or immune system disorders.
[0187] In one embodiment the disorder is selected from the group consisting of cancer, inflammatory diseases and/or immune system disorders (e.g. rheumatoid arthritis, systemic lupus erythematosus), angiofibroma, cardiovascular diseases, fibrotic diseases, diabetes, autoimmune diseases, chronic and acute neurodegenerative disease like Huntington's disease, Parkinson's disease, disruptions of nerval tissue and infectious diseases like fungal, bacterial and viral infections. In another embodiment the disorder is a proliferative disorder.
[0188] The histone deacetylase inhibitors of the invention have significant antiproliferative effects and promote differentiation, cell cycle arrest in the G1 or G2 phase, and induce apoptosis.
SYNTHESIS OF DEACETYLASE INHIBITORS
[0189] The agents of the various embodiments may be prepared using the reaction routes and synthesis schemes as described below, employing the techniques available in the art using starting materials that are readily available. The preparation of particular compounds of the embodiments is described in detail in the following examples, but the artisan will recognize that the chemical reactions described may be readily adapted to prepare a number of other agents of the various embodiments. For example, the synthesis of non-exemplified compounds may be successfully performed by modifications apparent to those skilled in the art, e.g. by appropriately protecting interfering groups, by changing to other suitable reagents known in the art, or by making routine modifications of reaction conditions. A list of suitable protecting groups in organic synthesis can be found in T.W. Greene's Protective Groups in Organic Synthesis, Td Edition, John Wiley & Sons, 1999. Alternatively, other reactions disclosed herein or known in the art will be recognized as having applicability for preparing other compounds of the various embodiments.
[0190] Reagents useful for synthesizing compounds may be obtained or prepared according to techniques known in the art.
[0191] In the examples described below, unless otherwise indicated, all temperatures in the following description are in degrees Celsius and all parts and percentages are by weight, unless indicated otherwise.
[0192] Various starting materials and other reagents were purchased from commercial suppliers, such as Aldrich Chemical Company or Lancaster Synthesis Ltd., and used without further purification, unless otherwise indicated.
Tetrahydrofuran (THE) and N,N-dimethylformamide (DMF) were purchased from Aldrich in SureSeal bottles and used as received. All solvents were purified by using standard methods in the art, unless otherwise indicated.
[0193] The reactions set forth below were performed under a positive pressure of 5 nitrogen, argon or with a drying tube, at ambient temperature (unless otherwise stated), in anhydrous solvents, and the reaction flasks are fitted with rubber septa for the introduction of substrates and reagents via syringe. Glassware was oven-dried and/or heat-dried. Analytical thin-layer chromatography was performed on glass-backed silica gel 60 F 254 plates (E Merck (0.25 mm)) and eluted with the appropriate solvent ratios 10 (v/v). The reactions were assayed by TLC and terminated as judged by the consumption of starting material.
[0194] The TLC plates were visualized by UV absorption or with a p-anisaldehyde spray reagent or a phosphomolybdic acid reagent (Aldrich Chemical, 20wt% in ethanol) 15 which was activated with heat, or by staining in iodine chamber. Work-ups were typically done by doubling the reaction volume with the reaction solvent or extraction solvent and then washing with the indicated aqueous solutions using 25% by volume of the extraction volume (unless otherwise indicated). Product solutions were dried over anhydrous sodium sulfate prior to filtration, and evaporation of the solvents was under 20 reduced pressure on a rotary evaporator and noted as solvents removed in vacuo.
Flash column chromatography [Still et al, J. Org. Chem., 43, 2923 (1978)] was conducted using Silica gel 60 (Merck KGaA, 0.040-0.063 mm, 230-400 mesh ASTM) and a silica gel:crude material ratio of about 20:1 to 50:1, unless otherwise stated.
Hydrogenolysis was done at the pressure indicated or at ambient pressure.
[0195] NMR spectra were recorded on a Bruker AVANCE 400 spectrometer operating at 400 MHz for 11-I NMR and 100 MHz for 13C-NMR. NMR spectra are obtained as CDCI3 solutions (reported in ppm), using chloroform as the reference standard (7.26 ppm and 77.14 ppm) or CD3OD (3.3 and 49.3 ppm), or DMSO-d6 (2.50 and 39.5 ppm) or an internal tetramethylsilane standard (0.00 ppm) when appropriate.
Other NMR solvents were used as needed. When peak multiplicities are reported, the following abbreviations are used: s = singlet, d = doublet, t = triplet, q =
quartet, m =
multiplet, br = broadened, dd = doublet of doublets, dt = doublet of triplets.
Coupling constants, when given, are reported in Hertz.
[0196] Mass spectra were obtained using LC/MS either in ESI or APCI. All melting points are uncorrected.

[0197] All final products had greater than 90% purity (by HPLC at wavelengths of 254 nm and/or 220 nm). Analytical HPLC conditions for purity check: Xterra RP18 3.5 gm 4.6 x 20mm IS column; 2.0 ml/min, gradient 5-65% B over 4 min, then 65-95%b over 1 min and 95%6 for additional 0.1 min; Solvent A: H20 with 0.1% TFA;
Solvent B:
acetonitrile with 0.1% TFA.
[0198] The following examples are intended to illustrate the embodiments disclosed and are not to be construed as being limitations thereto. Additional compounds, other than those described below, may be prepared using the following described reaction scheme or appropriate variations or modifications thereof.
SYNTHESIS
[0199] Scheme I and ll illustrates the procedure used for preparing compounds of formula lb, wherein X and Y are hydrogens, compounds (VII) of formula la can be prepared by analogous procedure, for example, by the choice of appropriate starting material. For example, in the case of Z is ¨CH=CH- and attached to C5-position in Formula lb, such compound(s) can be synthesized by analogous method illustrated in Scheme I and ll starting with a substituted cinnamic acid (e.g. trans-3-nitro-4-chloro-cinnamic acid), appropriate amine component (R1NF12), carboxylic acid component (R2CO2H, Scheme I) or aldehyde (R2CHO, Scheme II), and appropriate hydroxylamine or N-alkyl hydroxylamine (NHR3OH where R3 is defined as above in Formula la).
[0200] Specifically, the hydroxamate compounds Formula lb can be synthesized by the synthetic route shown in Scheme I. The reaction of trans-4-chloro-3-nitrocinnamic acid (I) with an amine R1NH2 in the present of a base (e.g. triethylamine) in an appropriate solvent (e.g. dioxane) gave (II). Treatment of (II) in methanol under acid catalysis (e.g. sulfuric acid) resulted in esterification providing (III).
Alternatively, the carboxylic acid (I) may be esterified to the methyl ester (la) and then the chloride was replaced by the appropriate amine component R1NH2 to give compound (III). The nitro group of (III) can be reduced by appropriate reducing agent (e.g. tin (II) chloride) and , the resulting phenylenediamine (IV) was coupled with an acid R2CO2H to give amide (V) which was subsequently cyclized in an appropriate solvent (e.g. acetic acid) to give benzimidazole (VI) (J. Med. Chem. 2001, 44, 1516-1529). The hydroxamate compounds (VI) were obtained from methyl ester (VI) by a known synthesis method (J.
Med. Chem., 2002, 45, 753-757).

Scheme I

02N la 02N
OH Base la OH Me0H 02N lb 0v pp.
CI IW dioxane WN H2SO4 H ii H iii Me0H o, RiNH2,/

H+ Base CI IW dioxane la SnCl2 H2N R2CO2H
AcOH/MedHN coupling reagent IV

n RV and/orO' .,R2 R' W
V

ItpLILs.... R44 40 , NH2OH.H.C1 R2 -\N pl N.OH
NaOCH3 R' VI vii [0201] Alternatively, as depicted in Scheme II, compound (VI) was prepared by reacting with an appropriate aldehyde component R2CHO in the presence of a reducing agent of nitro group (e.g. tin (II) chloride or zinc powder) in one-pot (Tetrahedron Letters, 2000, 41, 9871-9874). Formic acid was used to prepare compound (VI) when R2= H.
Scheme II

SnCl2 or Zn N

02N AcOH/Me0H N

R' WN Ilirvi H Ill HCO2H, SnCl2 __________________________________________ )1,- VI (R2 = H) Me0H
[0202] in both Schemes I & II, the benzimidazole ring may be constructed by a cyclization step involving either an aldehyde or a carboxylic acid. The following reaction steps 1-4 refer to the use of carboxylic acid for the cyclization of (IV) via (V) to form benzimidazole derivatives (VI), followed by the conversion of ester (VI) to the hydroxamate (VII). For one-pot cycylization of (III) to (VI), see the procedures under Example 1.
Step 1: Reduction of nitro group [0203] To a pre-stirred solution of starting material (III, 1.0 mmol) in 50 mL
of co-solvent (glacial acetic acid: methanol= 2:8), Tin chloride was added (5.0 mmol). The resulting solution was heated to 55 C overnight and then cooled to room temperature.
The solvent was removed and the mixture was neutralized with sodium bicarbonate to pH 8. The crude product was extracted with dichloromethane (20 mL) for three times.
The organic extracts were combined and washed with water (15 mL) twice and brine (15 mL) once and further dried over Na2SO4 for 1 hour. It was filtered and concentrated; the diamino product (IV) was purified by flash chromatography.
Step 2: Amide formation [0204] To a pre-stirred solution of carboxylic acid (1.1 mmol), diamino product (IV, 1.0 mmol) and PyBOP (1.1 mmol) in 10 mL of dried dichloromethane, was added DIEA
(3.0 mmol) via a syringe. The resulting mixture was stirred at room temperature for 4 hours. The amide product (V) was purified by silica gel column chromatography.
Step 3: Cyclization [0205] The amide product (V), obtained in Step 2, was treated with 5 mL of glacial acetic acid, the resulting solution was heated to 75 C for 24 hours. After cooling down to it, the solvent was removed under vacuum to give product (VI) near quantitatively.
Step 4: Hydroxamic acid formation [0206] To a stirred solution of ester (VI) and NH2OH=FICI (10 equiv.) in Me0H
(0.5 M) was added Na0Me solution (20 equiv.) at - 78 C. The reaction mixture was then allowed to warm up slowly to room temperature. The reaction was monitored by LC/MS
and was completed in around 15-60 min. IN HCI was then added slowly into the reaction mixture at 0 C. The desired product was separated by reverse-phase preparative HPLC and the fractions containing the desired product were freeze-dried.
The hydroxamate product (VI) was obtained as TEA salt (isolated yield varies between 40 - 70%).
[0207] Scheme III illustrates another alternative procedure used for preparing , compounds of formula lb, where X and Y are hydrogens and R2 is selected from the group R11S(0)R13-, R11S(0)2R13-, R11c(0)N(R12)R13_, R11S02N(R12)R13-, R11N(R12)c(0)R13_, R11N(Ri2)so2R13_, R11N(R12)C(0)N(R12)R13- and heteroalkyl.
For example, in the case of Z is -CH=CH- and attached to C5-position in Formula lb, such compound(s) (XIII) can be synthesized by analogous method illustrated in Schemes I &

starting with appropriate (III), appropriate Fmoc protected amino acids, appropriate acid chlorides or aldehydes, and hydroxylamine.
Scheme III
o o OMe SnC12/H+ H2N lei OMe I.
R1-N Me0H HN
i H III R1 IV , - -H 0 A Fmoc-HN-0-14 i 0 Fmoc-N n n OH 0 H2N 0 and/or 0 OMe __________________ N. 40 ', I
- HN Fmoc-HN n R1 Me0H/H+

OMe 20% Piperidine N
nN 4g _________ if/ _____ 1 40 OMe n H2N 1 Fmoc-HN rj Ri XI R1 x NaBH(OAc)3 R12-COCI [or R12-S02C1]

CH3COOH 0 Triethyl amine z 1 Iµl 0 OMe 0 z __ i 40 m -N1--i n FJ e i-NH 1 n r1 R12 R1 XII
R"12 Ri XiV [R12-S02] NH2OH.HCI
NH2OH.HCI
N
N Na0Me 0 a0Me 0 n 11101 1 )1\ii i <N OH
.

rN1-1 n ri RI 1 n=1, 2 n=1, 2 [0208] More specifically, for example, the hydroxamate compounds Formula lb, where X and Y are hydrogens, R2 is selected from the group R11S(0)R13-, R11S(0)2R13-, R"C(0)N(R12)R13-, Fe1s02N(R12)R13_, R11N(R12)C(0)R13-, R11N(R12)S02R13-, R11N(R12)C(0)N(R12)R13- and heteroalkyl; and Z is attached to C5-position, can be synthesized by the synthetic route shown in Scheme Ill. Appropriate intermediate (Ill) was reduced with tin chloride to the corresponding diamines (IV). The coupling reaction with appropriate Fmoc protected amino acids in the presence of PyBOP gave coupling product(s) (VIII) and/or (IX). Without further separation, (VIII) and/or (IX) were subjected to cyclization under acid conditions and yielded benzimdiazole (X).
The key intermediate (XI) can be obtained by treating (X) with 20% piperidine.
Treatment of (XI) with an appropriate acid chloride or an appropriate sulfonyl chloride gave (XII) and the target compounds (XIII) were obtained by using similar method described in Scheme I.
[0209] When (XI) was reacted with an appropriate aldehyde under reduction 5 conditions (NaBH(OAc)3 /CH3CO2H), (XIV) was obtained and can be transformed to corresponding hydroxamate derivatives (XV) by the same methods described above.
[0210] Scheme IV illustrates some reactions to further modify R1 side chain.
If the R1 side chain contained a protecting group such as Boc in compound (Vial), it could be 10 removed before converting to the final hydroxamic acid (Vila). The intermediate (Via) could be modified by acylation, reductive alkylation, alkylation or sulfonylation to form new analogs (VIlb, Vlic, Viid and Vile) through new intermediates (Vib, Vic, Vid and Vie). The above described methods were also applied to R1 = heterocycles, e.g., R1 =
N-Boc-piperidin-3-yl, N-Boc-piperidin-4-y1 and N-Boc-pyrrolidin-3-yl.

Scheme IV
o o 0 R2-N SI OMe H4*
--).- R2-<' N fa `- OMe NH OKHCI N 0 NH
2 ,... R2_</
N N W-P N OH

Vial H
NaOCH3 -.. Vla L.i Vila BOCN .Ri 1 HN..R11 H14..

N
OMe NH2OH.HCI R2_.N fa 0 R12CO2H or R2-<' 0 N NOH.
(Rump ______,...
N iqP H
v. L----. Vlb NaOCH3 H VIlb . ' Y. Ri 1 12 R N. u 0 it R
o o o OMe 0 R CHO R2--N liffl N id N,OH
R2- 1101 OMe NH2OH.HCI R2_.
ip. .
N

Reductive H Vic NaOCH3 H
L-1 via VlIc amination Ri2 NRi 1, ---....õ--HN,Ri 1 0.12 m rl 1'1' R11 N N-OH
R12X N NH2OH.HCI R2_<, 0 H
N
H Vld NaOCH3 (X = halide) R12____N, H I/11d R1 2._ pd, 0 '' \ 0 OMe N-OH

H
N
R12S0201 Vie NaOCH3 1:3 IfIle R124-N,Ril 8 R12_g-N-Ril II

[0211] Scheme V illustrates some alternative method to prepared (Via) and (Vic).
The primary amine (II1a2) was prepared either from (la) or via (Mai). The derivertization of the amino group (e.g., reductive amination) could be performed either from (111a2) or (VIa2). The products, i.e., (111a2-1) and (VIa2-1), could be further derivertized (e.g., reductive amination of the secondary amine).

Scheme V

H2N''-'NHBoc 02N
02N io o, ________ HN H+ 02N
CI H 111a1 HN
la NHBoc HNH2 111 a2 H2N, ¨ NH2 02N n R2CHO or HCO2H R24 al 1 R12CH0 __ R241 SCI2 or Zn N 11W
HN
11182 V1a2 reductive amination Vla2-1 reductive amination R2CHO or HCO2H R12 SnCl2 or Zn N
(y"
02N = 0.- 0 fa 2N

N
HN HN IWP
Vla2-2 111a2-1 \¨N
R1`2,..¨ NH
[0212] The following preparations and examples are given to enable those skilled in the art to more clearly understand and to practice the subject matter hereof. They should not be considered as limiting the scope of the disclosure, but merely as being illustrative and representative thereof.
Preparation of intermediates III
[0213] Compound (III) was prepared either from (I) via (II) or from (I) via (la) (Scheme I and V). The following are examples of (III).
Intermediate 1 3-[4-(2-Dimethylamino-ethylamino)-3-nitro-phenyn-acrylic acid methyl ester [0214] A mixture of 3-(4-chloro-3-nitro-phenyl)acrylic acid methyl ester (la, 0.658 g, 2.72 mmol), N,N-dimethylethylenediamine (0.90 mL, 8.20 mmol) and triethylamine (1.2 mL, 8.6 mmol) in dioxane (20 mL) was heated at 80 C for 5h. The solution was evaporated and the residue was added DCM and aqueous Na2CO3. The DCM (x3) , extracts were concentrated and the residue was added Et0Ac-hexane. The resulting red solid was filtered to give the titled compound (0.672 g, 84.2%). HPLC
purity at 254 nm: 99.2%, tR = 1.59 min. LCMS (ESI) m/z: 294 ([M Fi]). 1H NMR (CDCI3 CD30D) 8 8.21 (1H, d, J = 2.1 Hz), 7.56 (1H, dd, J = 9.0, 2.1 Hz), 7.48 (1H, d, J =
16.0 Hz), 6.81 (1H, d, J = 9.0 Hz), 6.20 (1H, d, J = 15.9 Hz), 3.70 (3H, s), 3.34 (2H, t, J =
6.5 Hz), 2.56 68 =
(2H, t, J = 6.4 Hz), 2.23 (6H, s); 13C NMR (CDCI3 + CD30D) 8 167.3, 145.4, 142.6, 134.0, 131.1, 127.1, 121.3, 114.8, 114.0, 56.7, 51.1, 44.6,40.1.
Intermediate 2 344-(2-Diethylamino-ethylamino)-3-nitro-phenylFacrylic acid methyl ester.
[0215] Yellow solid. LCMS (ESI) m/z: 322 ([M + HIP). 1H NMR (CDCI3) 8 8.73 (1H, t-like, J = 4.3 Hz), 8.32 (1H, d, J = 2.0 Hz), 7.62 (1H, dd, J = 9.2, 2.0 Hz), 7.58 (1H, d, J
= 15.9 Hz), 6.85 (1H, d, J = 9.0 Hz), 6.29 (1H, d, J = 15.9 Hz), 3.80 (3H, s), 3.35 (2H, td, J = 5.4, 6.0 Hz), 2.77 (2H, t, J = 6.2 Hz), 2.59 (4H, q, J = 7.1 Hz), 1.07 (6H, t, J = 7.1 Hz).
Intermediate 3 344-(2-Ethylamino-ethylamino)-3-nitro-phenylFacrylic acid methyl ester [0216] Red solid. LCMS (ESI) m/z: 294 ([kl H]). 1H NMR (DMSO-d6) 58.49 (1H, t, J = 6.1 Hz), 8.35 (1H, d, J = 2.0 Hz), 7.96 (1H, dd, J = 9.1, 1.9 Hz), 7.62 (1H, d, J =
16.0 Hz), 7.20 (1H, d, J = 9.1 Hz), 6.52 (1H, d, J = 16.0 Hz), 3.75 (2H, td, J
= 6.5, 6.2 Hz), 3.70 (3H, s), 3.08 (2H, t, J = 6.5 Hz), 2.93 (4H, q, J = 7.2 Hz), 1.17 (6H, t, J = 7.2 Hz).
Intermediate 4 344-(2-lsopropylamino-ethylamino)-3-nitro-phenylFacrylic acid methyl ester [0217] Red solid. LCMS (ESI) m/z: 308 ([M H]+). 1H NMR (DMSO-d6) 8 8.58 (1H, t, J = 5.6 Hz), 8.33 (1H, d, J = 2.0 Hz), 7.94 (1H, dd, J = 9.1, 1.9 Hz), 7.60 (1H, d, J =
16.0 Hz), 7.14 (1H, d, J = 9.2 Hz), 6.49 (1H, d, J = 16.0 Hz), 3.70 (3H, s), 3.56 (2H, masked by water peak, identified by COSY), 3.10 (1H, septet, J = 6.4 Hz), 2.94 (2H, t, J = 6.2 Hz), 1.10 (6H, d, J = 6.4 Hz).
Intermediate 5 344-(3-Dimethylamino-2,2-dimethyl-propylamino)-3-nitro-phenylFacrylic acid methyl ester.
[0218] Red solid. LCMS (ESI) m/z: 336 ([M + Hr.). 1H NMR (CDCI3) 8 9.73 (1H, br s or t), 8.33 (1H, d, J = 2.0 Hz), 7.60 (1H, dd, J = 8.9, 2.0 Hz), 7.59 (1H, d, J = 16.1 Hz), 6.88 (1H, d, J = 9.1 Hz), 6.28 (1H, d, J = 15.9 Hz), 3.80 (3H, s), 3.21 (2H, d, J = 4.6 Hz), 2.36 (2H, s), 2.34 (6H, s), 1.04 (6H, s).
Intermediate 6 3-[4-(2-Diisopropylamino-ethylamino)-3-nitro-phenyl]acrylic acid methyl ester [0219] Yellow solid. LCMS (ESI) m/z: 350 UM + Hr). 1H NMR (CDCI3) 8 8.76 (1H, t-like, J = 4.3 Hz), 8.32 (1H, d, J = 2.0 Hz), 7.61 (1H, dd, J = 8.3, 2.7 Hz), 7.58 (1H, d, J
= 15.8 Hz), 6.85 (1H, d, J = 9.0 Hz), 6.29 (1H, d, J = 15.9 Hz), 3.79 (3H, s), 3.31 (2H, td, J = 5.3, 6.1 Hz), 3.08 (2H, septet, J = 6.6 Hz), 2.84 (2H, t, J = 6.2 Hz), 1.07 (12H, d, J = 6.6 Hz).
Intermediate 7 3-[4-(2-Methylamino-ethylamino)-3-nitro-phenyl]-acrylic acid methyl ester [0220] Red solid. LCMS (ESI) m/z: 280 ([M + H]4). 1H NMR (CDCI3) 8 8.54 (1H, t-like, J = 4.2 Hz), 8.33 (1H, d, J = 2.1 Hz), 7.63 (1H, dd, J = 9.0, 2.2 Hz). 7.59 (1H, d, J =
16.0 Hz), 6.90 (1H, d, J = 9.0 Hz), 6.31 (1H, d, J = 15.9 Hz), 3.80 (3H, s), 3.45 (2H, td, J = 5.8, 5.6 Hz), 2.96 (2H, t, J = 6.2 Hz), 2.50 (3H, s).
Intermediate 8 314-(2-tert-Butoxycarbonylamino-ethylamino)-3-nitro-pheny1]-acrylic acid methyl ester (111a1) Step 1:
[0221] A suspension of trans-4-chloro-3-nitrocinnamic acid (1, 5.057 g, 22.22 mmol) in Me0H (40 mL) and DCM (20 mL) was stirred and cooled in a dry-ice/acetone bath.
SOCl2 (1.0 mL, 13.8 mmol) was added to the above mixture. Dry-ice bath was removed, then the mixture was warmed to room temperature and stirred at 40 C
till the reaction completed. The solution was evaporated to dryness to a pale yellow solid (5.364 g, 99.9%). HPLC purity at 254 nm: 99.5%; tR = 2.96 min. LCMS (ESI) m/z:

and 212 (very weak signal, [M+H-Me0H]+).
Step 2:
[0222] A mixture of 3-(4-chloro-3-nitro-phenyl)acrylic acid methyl ester (la, 0.243 g, 1.00 mmol), N-Boc-ethylenediamine (0.316 mL, 2.0 mmol) and triethylamine (0.50 mL, 3.59 mmoL) in dioxane (7 mL) was heated at 80 C for about 80 h. The solution was evaporated and the residue was added Me0H. The resulting solid was filtered and washed with Me0H. 344-(2-tert-Butoxycarbonylamino-ethylamino)-3-nitro-pheny1]-, acrylic acid methyl ester (111a1) was obtained as bright yellow solid (9.193 g, 52.6%).
HPLC purity at 254 nm: 96.0-98.1%; tR = 3.27 min. LCMS (ESI) m/z: 366 (DM +
HIE), 310 (M+H-56), 266 (M+H-Boc). 1H NMR (CDCI3) 68.41 (1H, br t like, NHAr), 8.31 (1H, d, J = 1.8 Hz), 7.63 (1H, dd, J = 9.0, 1.7 Hz), 7.57 (1H, d, J = 16.0 Hz), 6.98 (1H, d, J =
8.9 Hz), 6.30 (1H, d, J = 15.9 Hz), 3.80 (3H, s), 3.52 (2H, m), 3.45 (2H, m), 1.45 (9H, s); 13C NMR (CDCI3) 8 166.9, 155.7, 145.8, 142.3, 134.1, 131.5, 127.1, 121.8, 115.4, 113.9, 79.5, 51.2, 42.7, 39.1, 27.9.
Intermediate 9 5 3-(4-(2-Amino-ethylamino)4-nitro-phenylFacrylic acid methyl ester (111a2) [0223] Method 1:
Remove Boc protecting group from (111a1) under acidic condition: 1) HCl/Me0H;
2) TFA/DCM.
[0224] Method 2:
10 To the ester (la, 2.47 g, 10.2 mmol) in dioxane (102 mL, 0.1 M) was added ethylenediamine (Merck. Product no. 8.00947, 2.04 mL, 30.6 mmol) followed by triethylamine (2.8 mL, 20.47 mmol). The resulting mixture was heated to 90 C
and stirred for 20 hours. The completion of reaction was confirmed by using HPLC
(where the product 111a2 tR = 1.6 min, starting material la tR = 3.1 min). Upon completion, 15 solvent was removed and the crude was dissolved in DCM. The solution was washed with water, brine, dried over Na2SO4 and filtered. The filtrate after removal of the solvent gave the titled compound 111a2. Yield =98 %, LCMS m/z: 266 ([M+H]).
Example 1 20 Preparation of 311 -(3-Dimethylamino-2,2-dimethyl-propy1)-2-(2,2-dimethyl-propy1)-1H-benzoimidazol-5-A-N-hydroxy-acrylamide (1) [0225] The titled compound (1) was prepared according to Scheme 1 and 11, by using appropriate starting materials.
Step 1:
25 [0226]
To a pre-stirred solution of trans-4-chloro-3-nitrocinnamic acid (1, 11g, 48 ' mmol) in dioxane (200 mL) was added triethylamine (20 mL, 126 mmol), followed by 3-dimethylamino-2,2-dimethyl-propylamine (20 mL, 143 mmol). The reaction mixture was allowed to stir at 100 C for 1-2 days till all starting material was fully converted. Then, the solvent was removed under vacuum followed by the addition of H20 (250 mL) to 30 dissolve the residue. Conc. HCI was added till pH 1 with orange precipitation. The suspension was filtered and residue was washed with H20 several times to obtain (11) as orange solid (13 g, 84%). LCMS (ESI) m/z: 322 ([M+H]).
Step 2:
[0227] Compound (11,13 g, 40.5 mmol) was dissolved in Me0H (250 mL) followed by the addition of conc. H2SO4(5 mL). The reaction mixture was allowed to stir at 80 C for 18 h. Solvent was removed under vacuum and H20 (250 mL) was added to dissolve the residue. Na2CO3 was added till pH 8-9, subsequently, Me0H was added and stirred for 1 hour. Then, the suspension was filtered under vacuo and the residue was washed with H20 several times to obtain ester (III) as orange solid (10 g, 74%). LCMS
(ESI) m/z: 336 ([M+H]).
Step 3:
[0228] To a stirred solution of ester (III, 1 equiv) and SnC12=2H20 (5 equiv) in AcOH
and Me0H (0.2 M, 1:9 mixture) was added 3,3-dimethyl butyraldehyde (1.5 equiv). The resulting mixture was heated to 45 C with stirring. The progress of the reaction was monitor by LC/MS. When the reaction was completed, solvent was removed under reduced pressure at 30-35 C. To the resulting residue, 20 mL of water and 20 mL of ethyl acetate were added at room temperature, the pH value of the mixture was carefully adjusted to 9-10 by addition of conc. NH3=H20. The mixture was stirred for half an hour, followed by centrifuge if necessary to separate the organic layer. The organic layer was collected. The aqueous phase and residue (oily-solid precipitate) were extracted another 3 times more with ethyl acetate as described above. The combined organic contents were dried over sodium sulphate, filtered and evaporated to dryness. The resulting oily residue was purified by flash column chromatography (isolated yield of cyclized product (VI) varies between 50-90%). LCMS (ESI) m/z: 386 ([M+H]).
Step 4:
[0229] To a stirred solution of ester (VI) and NH2OH.HCI (10 equiv.) in Me0H
(0.5M) was added Na0Me (20 equiv.) at ¨ 78 C. The reaction mixture was then allowed to warm up slowly to room temperature. The reaction was monitored by LC/MS and was completed in around 15 min. 1N HCI was then added slowly into the reaction mixture at 0 C. The desired product was separated by prep-HPLC and the fractions containing the desired product were freeze-dried. Product (VII) was obtained as di-TFA
salt (isolated yield varies between 40 ¨ 70%). HPLC purity at 254 nm: 100%, tR =
0.78 min.
LCMS (ESI) m/z: 387 ([M+H]). 1H NMR (DMSO-d6) 8 0.99 (15H, s), 2.91 (6H, s), 2.92 (2H, s), 3.32 (2H, bs), 4.30 (2H, s), 6.49 (1H, d, J = 15.8 Hz), 7.56 (1H, d, J = 9.0 Hz), 7.61 (1H, d, J = 15.76 Hz), 7.83 (1H, d, J = 9.0 Hz), 7.85 (1H, s), 9.22 (1H, bs), 10.72 (1H, bs); 13C NMR (DMSO-d6) 8 162.6, 154.2, 138.0, 135.3 (br), 134.7, 131.5, 122.8, 119.2, 115.2, 114.0,66.5, 51.1, 46.7, 38.4, 38.3, 33.6, 29.1, 22.8.

Example 2 Preparation of 3-[1-(3-Dimethylamino-2,2-dimethyl-propy1)-2-isopropyl-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (2) [0230] The titled compound (2) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm:
100%, tR
= 0.54 min. LCMS (ES!) miz: 359 ([M+H]+). 1H NMR (DMSO-d6) 6 1.05 (6H, s), 1.40 (6H, d, J = 6.36 Hz), 2.92 (6H, s), 3.36 (2H, s), 3.58 (1H, m, J = 6.4 Hz), 4.44 (2H, s), 6.55 (1H, d, J = 15.8 Hz), 7.63 (1H, d, J = 15.8 Hz), 7.66 (1H, d, J = 8.7 Hz), 7.95 (1H, d, J = 8.7 Hz), 7.90 (1H, s), 9.71 (1H, bs), 10.80 (1H, bs).
Example 3 Preparation of 3-[2-Butyl-1-(3-dimethylamino-2,2-dimethyl-propy1)-1H-benzoimidazol-5-yl]-N-hydroxy-acrylamide (3) [0231] The titled compound (3) was prepared according to the procedures described in Example 1, by using appropriate starting materials. Yield: 74 mg as TFA
salt. HPLC
purity at 254 nm: 99.0%, tR = 0.89 min. LCMS (ES!) m/z: 373 ([M + 1H
NMR
(CD30D) 8 7.99 (1H, d, J = 8.8 Hz), 7.84 (1H, s), 7.72 (1H, d, J = 8.7 Hz), 7.55 (1H, d, J
= 15.8 Hz), 6.53 (1H, d, J = 15.7 Hz), 4.55 (2H, s), 3.43 (2H, s), 3.24 (2H, overlapped with CD2HOD), 3.00 (6H, s), 1.90 (2H, pentet, J = 7.2 Hz), 1.49 (2H, m), 1.21 (6H, s), 0.98 (3H, t, J = 7.3 Hz); 13C NMR (CD30D) 5 165.5 (br), 158.2, 139.8, 135.3, 135.1, 132.4, 126.4, 120.6 (br), 115.6, 114.3, 68.7, 53.5, 47.8 (Mex2), 39.5, 29.9, 27.2, 23.6 (Mex2), 23.3, 13.9.
Example 4 Preparation of 341-(3-D imethylamino-2,2-di methyl-propyI)-2-(2-methylsu Ifanyl-ethyl)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (4) [0232] The titled compound (4) was prepared according to the procedures described in Example 1, by using appropriate starting materials. Yield: 17 mg as TFA
salt. HPLC
purity at 254 nm: 96.2%, tR = 0.75 min. LCMS (ES!) miz: 391 UM + 1H
NMR
(CD30D) 8 8.02 (1H, d, J = 8.3 Hz), 7.92 (1H, s), 7.80 (1H, d, J = 8.7 Hz), 7.69 (1H, d, J
= 15.8 Hz), 6.60 (1H, d, J = 15.8 Hz), 4.49 (2H, s), 3.50 (2H, t, J = 7.2 Hz), 3.37 (21-I, s), 3.03 (2H, t, J = 7.2 Hz), 2.95 (6H, s), 2.18 (3H, s), 1.25 (6H, s); 13C NMR
(CD30D) 8 163.7, 154.6, 138.2, 133.9, 132.8, 132.5, 124.1, 118.2, 113.3, 113.2, 66.7, 51.5, 45.9 (Mex2), 37.6, 29.9, 26.2, 21.7 (Mex2), 13.7.

Example 5 Preparation of 3-[1-(3-Dimethylamino-2,2-dimethyl-propy1)-2-isobutyl-1H-benzoimidazol-5-yl]-N-hydroxy-acrylamide (6) [0233] The titled compound (6) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm:
96.2%, tR
= 0.82 min. LCMS (ESI) m/z: 373 ([M+H]+). 1H NMR (DMSO-d6): 8 10.80 (1H, s), 9.47 (1H, s), 7.93 (1H, s), 7.90 (1H, d, J=6.6 Hz), 7.64 (1H, d, J= 7.4 Hz), 7.62 (1H, d, J=
15.5 Hz), 6.54 (1H, d, J= 15.8 Hz), 4.39 (2H, s), 3.33 (2H, s), 2.97 (2H, d, J
= 7.26 Hz), 2.92 (6H, s), 2.35 (1H, qn), 1.09 (6H; s), 0.97 (6H, d, J = 6.6 Hz).
Example 6 Preparation of 341-(2-Diethylamino-ethyl)-2-isobuty1-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (7) [0234] The titled compound (7) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm:
99.0%, tR
= 0.56 min. LCMS (ESI) m/z: 359 ([M+H]). 1H NMR (DMSO-d6): 8 10.81 (1H, s), 10.13 (1H, s), 7.90 (1H, s), 7.81 (1H, d, J= 8.5 Hz), 7.66 (1H, d, J= 8.6 Hz), 7.61 (1H, d, J=
15.8 Hz), 6.53 (1H, d, J= 15.8 Hz), 4.72 (2H, t, J = 7.8 Hz), 3.30 (2H, d), 2.93 (2H, d, J
= 7.2 Hz), 2.27 (1H, m), 1.24 (6H, t, J = 7.2 Hz), 0.97 (6H, d, J= 6.6 Hz) 13C
NMR
(DMSO-d6) 8 162.7, 158.5, 158.2, 155.2, 138.4, 133.9, 131.0, 123.0, 118.6, 116.0, 111.6, 48.8, 46.8, 34.1, 27.1, 22.2, 8.5.
Example 7 Preparation of 342-Buty1-1-(2-diethylamino-ethyl)-1 H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (8) [0235] The titled compound (8) was prepared according to the procedures described in Example 1, by using appropriate starting materials. Yield: 61 mg (20% in two steps) as TFA salt. HPLC purity at 254 nm: 98.1%, tR = 0.59 min. LCMS (ESI) m/z: 359 (EM +
Hr). 1H NMR (CD30D) 67.89 (1H, d, J = 8.6 Hz), 7.80 (1H, s), 7.71 (1H, d, J =
8.5 Hz), 7.45 (1H, d, J = 15.7 Hz), 6.44 (1H, d, J = 15.7 Hz), 4.90 (2H, overlapped with DHO, identified by COSY), 3.64 (2H, t-like, J = 7.6 Hz), 3.39 (4H, q, J = 7.6 Hz), 3.21 (2H, t, J
= 7.9 Hz), 1.89 (2H, pentet, J = 7.5 Hz), 1.52 (2H, m), 1.35 (6H, t, J. = 7.2 Hz), 1.00 (3H, t, J = 7.3 Hz); 13C NMR (CD30D) 8 163.6, 155.7, 138.1, 132.8, 132.1, 131.9, 124.6, 118.0, 113.2, 111.7, 48.3, 46.8 (2C), 38.6, 27.5, 24.7, 21.4, 12.0, 7.0 (2C) Example 8 Preparation of 342-But-3-yny1-1-(3-dimethylamino-2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (9) [0236] The titled compound (9) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm:
98.3 %;
tR = 0.52 min; LCMS (ESI) rn/z: 369 ([K4 +Fi]). 1H NMR (DMSO-d6) 8 9.49 (brs, 1H), 7.88 ¨ 7.85 (m, 2H), 7.63 ¨ 7.59 (m, 2H), 6.52 (d, J = 15.79 Hz, 1H), 4.37 (s, 1H), 3.33 (s, 2H), 3.26 (t, J = 7.24 Hz, 2H), 2.92 (s, 6H), 2.88 (t, J = 2.54 Hz, 1H), 2.81 (dt, J =
2.48, 7.70 Hz, 2H), 1.09 (s, 6H); 13C NMR (DMSO-d6) 5 162.8, 155.3, 138.4, 138.0, 135.9, 130.5, 122.3, 118.4, 117.8, 116.4, 114.9, 112.9, 111.9, 82.8, 72.3, 66.9, 50.9, 46.7, 25.8, 22.8, 16.2.
Example 9 Preparation of 342-But-3-eny1-1-(3-dimethylamino-2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (10) [0237] The titled compound (10) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99 %; tR = 0.80 min; LCMS (ESI) rn/z: 371 ([M + H].). 1H NMR (CD30D) 8 7.95 (d, J = 8.8 Hz, 1H), 7.85 (s, 1H), 7.73 (d, J = 8.8 Hz, 1H), 7.63 (d, J = 15.8 Hz, 1H), 6.54 (d, J = 15.8 Hz, 1H), 5.94 ¨ 5.84 (m, 1H), 5.10 (dd, J = 1.4, 17.1 Hz, 1H), 5.03 (dd, J =
1.1, 10.2 Hz, 1H), 4.51 (s, 2H), 3.40 (s, 2H), 3.32 (t, J = 7.6 Hz, 2H), 2.99 (s, 6H), 2.66 (q, J = 7.5 Hz, 2H), 1.19 (s, 6H); 13C NMR (CD30D) 8 165.7, 157.6, 140.2, 136.3, 135.9, 134.7, 134.5, 125.9, 120.2, 117.9, 115.2, 103.6, 68.8, 53.4, 39.6, 32.0, 27.2, 23.7.
Example 10 Preparation of 342-But-3-eny1-1-(2-diethylamino-ethyl)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (11) [0238] The titled compound (11) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 99.4 CYO tR =
0.52 min; LCMS (ESI) m/z: 357 ([M+H]+1). 1H NMR (CD30D) 5 7.94 (d, J = 8.7 Hz, 1H), 7.81 (s, 1H), 7.73 (d, J = 8.3 Hz, 1H), 7.50 (d, J = 15.87 Hz, 1H), 6.46 (d, 1= 15.8 Hz, 1H), 5.96 ¨ 5.86 (m, 1H), 5.13 (dd, J = 1.4, 17.1 Hz, 1H), 5.05 (dd, J = 1.1, 10.2 Hz, 1H), 4.93 (t, J = 7.9 Hz, 2H), 3.62 ¨ 3.58 (m, 2H), 3.38 ¨ 3.31 (m, 6H), 2.65 (q, J = 7.6 Hz, 2H), 1.35 ¨ 1.32 (m, 6H); 13C NMR (CD30D) 8 165.8, 157.0, 140.5, 136.6, 135.9, 134.6, 134.2, 126.1, 119.5, 117.7, 116.0, 113.3, 50.4, 40.4, 31.7, 26.7, 9.1.

Example 11 Preparation of 3-[2-But-3-yny1-1-(2-diethylamino-ethyl)-1H-benzoimidazol-5-y1]-N-' hydroxy-acrylamide (12) [0239] The titled compound (12) was prepared according to the procedures 5 described in Example 1, by using appropriate starting materials. HPLC:
99.6 %; tiR =
0.37 min; LCMS (ESI) m/z: 355 ([M+H]). 1H NMR (CD300) 8 7.82 (d, J = 8.7 Hz, 1H), 7.68 (s, 1H), 7.58 (d, J = 8.5 Hz, 1H), 7.31 (d, J = 15.8 Hz, 1H), 6.31 (d, J
= 15.8 Hz, 1H), 4.87 ¨ 4.79 (masked peaks), 3.54 ¨ 3.50 (m, 2H), 3.37 (t, J = 7.1 Hz, 2H), 3.24 (q, J = 7.2 Hz, 4H), 2.73 (dt, J = 2.4, 6.0 Hz, 2H), 2.30 (t, J = 2.5 Hz, 1H), 1.21 (t, J = 7.2 10 Hz, 6H); 13C NMR (CD30D) 8 165.9, 156.1, 140.9, 138.1, 135.2, 133.4, 125.6, 118.8, 117.0, 112.8, 82.4, 72.1, 50.6, 40.2, 26.7, 26.4, 17.3, 9.1.
Example 12 Preparation of 341-(3-Dimethylamino-2,2-dimethyl-propy1)-2-(3,3,3-trifluoro-15 propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (13) [0240] The titled compound (13) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 96.5 %; tR = 0.80 min; LCMS (ESI) m/z: 413 ([M+H]).
20 Example 13 Preparation of 341-(2-Diethylamino-ethyl)-2-(3,3,3-trifluoro-propy1)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (14) [0241] The titled compound (14) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity:
96.4%; tR
25 = 1.37 min; LCMS (ESI) m/z: 399 ([M+H]). 1H NMR (DMSO-d6) 8 1.25 (6H, t), 2.96 (2H, m), 3.31 (6H, m), 3.44 (2H, m), 4.72 (2H, m), 6.51 (1H, m), 7.51 (2H, m), 7.65 (1H, m), 7.83 (1H, m), 10.45 (1H, bs) .
Example 14 30 Preparation of 341-(2-Diethylamino-ethyl)-2-ethoxymethy1-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (15) , [0242] The titled compound (15) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity:
98.1%; tR
= 0.48 min; LCMS (ESI) m/z: 361([M+H]).

Example 15 Preparation of 341-(3-Dimethylamino-2,2-dimethyl-propy1)-2-methy1-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (16) [0243] The titled compound (16) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity:
99.5%; tR
= 0.30 min; LCMS (ESI) m/z: 331 ([M+H]). 1H NMR (DMSO-d6) 8 1.13 (6H, s), 2.78 (2H, m), 2.89 (6H, s), 3.33 (2H, m), 4.42 (3H, s), 6.57 (1H, m), 7.57-7.69 (2H, m), 7.95 (2H, m), 9.68 (1H, bs), 10.81 (1H, bs) Example 16 Preparation of 3-[1-(2-Diethylamino-ethyl)-2-(2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (17) [0244] The titled compound (17) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%, tR = 0.95 min. LCMS (ESI) m/z: 373 ([M+Hr). 1H NMR (CD30D) 8 7.85 (2H, t, J = 8.3 Hz), 7.75 (1H, d, J = 8.8 Hz), 7.61 (1H, d, J = 15.8 Hz), 6.51 (1H, d, J =
15.8 Hz), 4.93 (2H, t, J = 6.1 Hz), 3.54 (2H, t, J = 8.1 Hz), 3.31 (4H, qt, J
= 7.3 Hz), 3.10 (2H, s), 1.27 (6H, t, J = 7.3 Hz), 1.06 (9H, s); 13C NMR (CD30D) 8 163.7, 153.3, 138.3, 133.1, 131.9, 124.5, 118.3, 117.1, 113.5, 111.8, 48.1, 39.1, 37.5, 32.9, 27.8, 7.1.
Example 17 Preparation of N-Hydroxy-3-[1-(3-isopropylamino-propy1)-2-(3,3,3-trifluoro-propy1)-1H-benzoimidazol-5-y11-acrylamide (18) [0245] The titled compound (18) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity:
96.8%; tR
= 0.72 min. LCMS (ESI) m/z: 399 ([M+H]). 1H NMR (DMSO-d6) 8 1.18 (6H, d), 2.07 (2H, m), 2.95 (4H, m), 3.27 (3H, m), 4.43 (2H, m), 6.52 (1H, m), 7.55 (2H, m), 7.61 (1H, m), 7.84 (1H, m), 8.65 (2H, bs).
Example 18 Preparation of 342-(2,2-Dimethyl-propy1)-1-(2-isopropylamino-ethyl)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (19) [0246] The titled compound (19) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 98.1%, tR = 0.86 min. LCMS (ESI) m/z: 359 ([M+H]+). 1H NMR (CD30D) 8 7.86 (1H, d, J = 8.6 Hz), 7.78 (1H, s), 7.73 (1H, d, J = 8.5 Hz), 7.44 (1H, d, J =
15.8 Hz), 6.45 (1H, d, J = 15.4 Hz), 4.83 (2H, t, J = 6.42 Hz), 3.52 (2H, t, J = 6.6 Hz), 3.36 (1H, 77 =
qt, J = 6.5 Hz), 3.13 (2H, s), 1.26 (6H, d, J = 6.2 Hz), 1.04 (9H, s); 13C NMR
(CD30D) 161.2, 153.4, 138.3, 133.0, 124.4, 113.6, 112.0, 51.1, 41.8, 41.1, 37.3, 33.1,27.8, 17.2.
Example 19 Preparation of 341-(2-Diisopropylamino-ethyl)-2-(2,2-dimethyl-propyl)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (20) [0247] The titled compound (20) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 96.8%, tR = 0.94 min. LCMS (ESI) rn/z: 400 ([M+1-11+). 1H NMR (CD30D) 8 7.86 (1H, s), 7.80 (1H, d, J = 8.7 Hz), 7.76 (1H, d, J = 8.6 Hz), 7.62 (1H, d, J =
15.8 Hz), 6.52 (1H, d, J = 16.0 Hz), 4.96 (2H, t, J = 5.2 Hz), 3.84 (2H, m), 3.53 (2H, t, J = 8.3 Hz), 3.06 (2H, s), 1.38 (12H, d, J = 6.5 Hz), 1.05 (9H, s); 13C NMR (CD30D) 8 160.2, 153.1, 138.2, 133.2, 131.9, 124.6, 113.5, 111.8, 54.9, 423.0, 40.5, 37.7, 33.0, 27.8, 16.3.
Example 20 Preparation of 3-[1-(2-Dilsopropylamino-ethyl)-2-isobuty1-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (21) [0248] The titled compound (21) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 95.3%, tR = 0.76 min. LCMS (ESI) m/z: 387 aM+Hr). 1H NMR (CD30D) 8 7.85 (1H, s), 7.71 (2H, s), 7.66 (1H, d, J = 15.8 Hz), 6.51 (1H, d, J= 15.8 Hz), 4.75 (2H, t, J
= 7.2 Hz), 3.86 (2H, t, J = 6.5 Hz), 3.50 (2H, t, J = 8.6 Hz), 2.98 (2H, d, J
= 7.4 Hz), 2.26 (1H, m) 1.41 (12H, d, J = 6.3 Hz), 1.06 (6H, d, J = 6.6 Hz).
Example 21 Preparation of 3-[1-(3-Dimethylami no-2,2-d i methyl-propy1)-2-hex-3-eny1-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (22) [0249] The titled compound (22) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%; tR = 1.24 min; LCMS (ESI) m/z: 399 ([M+Hr). 1H NMR (CD30D) 8 8.22 (d, J = 8.7 Hz, 1H), 8.11 (s, 1H), 7.96 (d, J = 8.6 Hz, 1H), 7.81 (d, J = 15.8 Hz, 1H), 6.68 (d, J = 15.8 Hz, 1H), 5.69 ¨ 5.59 (m, 2H), 4.79 (s, 2H), 3.66 (s, 2H), 3.55 (t, J = 7.3 Hz, 2H), 3.24 (s, 6H), 2.91 (q, J = 6.8 Hz, 2H), 2.21 ¨2.11 (m, 2H), 1.44 (s, 6H), 1.02 (t, J =
7.5 Hz, 3H); 13C NMR (CD30D) 8 165.7, 157.9, 140.2, 135.8, 134.6, 134.5, 126.1, 125.9, 120.1, 115.2, 114.6, 68.7, 533, 47.9, 39.6, 27.6, 25.9, 23.7, 21.4, 14.4.

Example 22 Preparation of 3-0-(3-Dimethylamino-2,2-dimethyl-propy1)-2-(2,4,4-trimethyl-pentyl)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (23) [0250] The titled compound (23) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 98.6%; tR = 1.61 min; LCMS (ESI) m/z: 429 ([M+H]). 1H NMR (CD30D) 8 8.19 (d, J = 8.8 Hz, 1H), 8.08 (s, 1H), 7.90 (d, J = 8.8 Hz, 1H), 7.76 (d, J = 15.7 Hz, 1H), 6.75 (d, J = 15.8 Hz, 1H), 4.79 (s, 2H), 3.62 (s, 2H), 3.35 ¨ 3.29 (m, 1H), 3.23 (s, 6H), 2.52 (brs, 2H), 1.50¨ 1.45 (m, 2H), 1.36 (d, J = 3.8 Hz, 6H), 1.12 (d, J = 5.5 Hz, 3H), 1.02 (s, 6H); 13C NMR (CD300) 8 165.6, 157.4, 139.9, 135.2, 135.1, 132.9, 126.4, 120.6, 115.7, 114.6, 68.6, 53.3, 51.4, 47.9, 39.7, 36.3, 31.9, 31.3, 30.2, 23.8, 22.3.
Example 23 Preparation of 342-Cyclohexy1-1-(3-dimethylamino-2,2-dimethyl-propy1)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (24) [0251] The titled compound (24) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%; tR = 0.96 min; LCMS (ESI) m/z: 399([M+Hr). 1F1 NMR (CD300): 8 8.21 (d, J = 8.8 Hz, 1H), 8.06 (s, 1H), 7.95 (d, J = 8.8 Hz, 1H), 7.83 (d, J = 15.8 Hz, 1H), 6.76 (d, J = 15.8 Hz, 1H), 4.79 (s, 2H), 3.65 (s, 2H), 3.60 ¨ 3.51 (m, 1H), 3.22 (s, 6H), 3.29 ¨
3.26 (m, 2H), 2.12 ¨ 2.09 (m, 2H), 2.03 ¨ 1.92 (m, 3H), 1.78 ¨ 1.59 (m, 3H), 1.41 (s, 6H); 13C NMR (CD30D) 8 165.7, 161.3, 140.1, 135.4, 134.8, 134.0, 126.1, 120.3, 119.6, 116.7, 115.5, 114.9, 68.7, 53.1, 47.9, 39.2, 37.0, 32.4, 26.5, 26.3, 23.6.
Example 24 Preparation of 342-Bicyclo[2.2.1]hept-5-en-2-y1-1-(3-dimethylamino-2,2-dimethyl-propy1)-1H-benzoimidazol-5-ylj-N-hydroxy-acrylamide (25) [0252] The titled compound (25) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%; tR = 0.91 min; LCMS (ESI) m/z: 409 ([M+H]+).
Example 25 Preparation of 3-[1-(2-Diethylamino-ethyl)-2-hex-3-eny1-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (26) [0253] The titled compound (26) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 99.9%;
tR
1.14 min; LCMS (ESI) m/z: 385 ([M+H]). 1H NMR (CD30D) 87.95 (d, J = 8.6 Hz, 1H), 7.87 (s, 1H), 7.77 (d, J = 8.5 Hz, 1H), 7.52 (d, J = 15.8 Hz, 1H), 6.50 (d, J
= 15.8 Hz, 1H), 5.57 - 5.44 (m, 2H), 3.72 - 3.68 (m, 2H), 3.44 (q, J = 7.2 Hz, 4H), 3.35 -3.30 (masked peaks), 2.73 (q, J = 7.1 Hz, 2H), 2.07 - 1.99 (m, 2H), 1.41 (t, J =
7.2 Hz, 6H), 0.88 (t, J = 7.5 Hz, 3H); 13C NMR (CD30D) 6 165.6, 157.2, 140.2, 135.9, 134.8, 134.6, 134.2, 126.4, 126.1, 119.8, 115.6, 113.5, 50.4, 40.5, 26.9, 25.4, 21.4, 14.4, 8.9.
Example 26 Preparation of 341 -(2-Diisopropylamino-ethyl)-2-hex-3-eny1-1 H-benzoimidazol-yli-N-hydroxy-acrylamide (27) [0254] The titled compound (27) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 99.9%;
tR =
1.22 min; LCMS (ESI) m/z: 413 ([M+H]). 1H NMR (CD30D) 8 7.94- 7.89 (m, 2H), 7.78 (d, J = 8.7 Hz, 1H), 7.53 (d, J = 15.8 Hz, 1H), 6.50 (d, J = 15.8 Hz, 1H), 5.63 -5.44 (m, 2H), 3.99 - 3.91 (m, 2H), 3.69 - 3.64 (m, 2H), 3.36 - 3.26 (masked peaks), 2.72 (q, J = 7.2 Hz, 2H), 2.08 - 2.01 (m, 2H), 1.50 (d, J = 6.5 Hz, 12H), 0.89 (t, J = 7.5 Hz, 3H); 13C NMR (CD30D) 8 165.6, 157.0, 140.2, 135.9, 135.4, 134.5, 134.3, 126.6, 126.3,126.2, 119.8, 115.8, 113.3, 56.9, 45.3, 41.9, 27.2, 25.5, 21.4, 18.2, 14.4.
Example 27 Preparation of 342-Hex-3-eny1-1-(2-isopropylamino-ethyl)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (28) [0255] The titled compound (28) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%; = 1.12 min; LCMS (ESI) m/z: 371 (EM+Hl+). 1H NMR (CD30D) 68.00 (d, J = 9.1 Hz, 1H), 7.77 - 7.75 (m, 2H), 7.17 (d, J = 15.7 Hz, 1H), 6.34 (d, J =
15.7 Hz, 1H), 5.57 - 5.42 (m, 2H), 4.92 (t, J = 5.9 Hz, 2H), 3.72 (t, J = 5.7 Hz, 2H), 3.54 - 3.48 (m, 1H), 3.39 (t, J = 7.5 Hz, 2H), 2.72 (q, J = 7.3 Hz, 2H), 2.06 - 1.99 (m, 2H), 1.39 (d, J = 6.5 Hz, 6H),0.87 (t, J = 7.5 Hz, 3H).
Example 28 Preparation of 341-(2-Ethylamino-ethyl)-2-hex-3-eny1-1H-benzoimidazol-5-y1FN-, hydroxy-acrylamide (29) [0256] The titled compound (29) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%; tR = 1.23 min; LCMS (ESI) m/z: 385 ([M+H]+). 1H NMR (CD300) 6 7.94 (d, J = 8.6 Hz, 1H), 7.89 (s, 1H), 7.77 (d, J = 8.4 Hz, 1H), 7.56 (d, J = 15.8 Hz, 1H), 6.55 (d, J = 15.7 Hz, 1H), 5.57 - 5.42 (m, 2H), 4.62 (t, J = 7.5 Hz, 2H), 3.42 -3.33 (m, 1H), 3.32 ¨ 3.30 (masked peaks), 3.28 ¨ 3.24 (m, 2H), 2.71 (q, J = 7.2 Hz, 2H), 2.33 (brs, 2H), 2.03 ¨ 1.94 (m, 2H), 1.36 (d, J = 6.5 Hz, 6H), 0.84 (t, J = 7.5 Hz, 3H);

(CD30D) 6 165.6, 156.3, 139.9, 136.8, 136.2, 135.2, 133.8, 132.8, 126.7, 125.8, 120.4, 114.6, 114.1, 52.2, 43.5, 42.9, 27.2, 26.5, 25.5, 21.4, 19.2, 14.4.

Example 29 Preparation of 342-Hex-3-eny1-1-(3-isopropylamino-propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (30) [0257] The titled compound (30) was prepared according to the procedures 10 described in Example 1, by using appropriate starting materials. HPLC
purity at 254 nm: 99.9%; tR = 1.04 min; LCMS (ESI) m/z: 357([M+H]+). 1H NMR (CD30D) 8 7.93 (d, J
= 8.4 Hz, 1H), 7.77 ¨ 7.73 (m, 2H), 7.23 (d, J= 15.7 Hz, 1H), 6.34(d, J = 15.7 Hz, 1H), 5.57 ¨ 5.42 (m, 2H), 4.87 (masked peaks), 3.68 (brs, 2H), 3.35 ¨ 3.30 (masked peaks), 3.22 ¨ 3.17 (m, 2H), 2.72 (q, J = 7.1 Hz, 2H), 1.35 (t, J = 7.2 Hz, 3H), 0.88 (t, J = 7.6 15 Hz, 3H); 13C NMR (CD30D) 5 165.6, 157.3, 140.5, 135.8, 134.9, 134.6, 134.2, 126.2, 126.1, 118.7, 115.9, 113.7, 113.6, 46.5, 45.0, 42.7, 26.4, 25.4, 21.4, 14.4, 11.4.
Example 30 Preparation of 3-[1-(2-Diethylam i no-ethyl)-2-hexy1-1H-benzoimidazol-5-y1]-N-20 hydroxy-acrylamide (31) [0258] The titled compound (31) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 100%, tR = 1.31 min. LC-MS m/z: 387 ([M+H]+). 1H NMR (DMSO-d6) 8 0.88 (3H, t, J = 7.0 Hz), 1.26 (6H, t, J = 7.2 Hz), 1.34 (4H, m), 1.44 (2H, m), 1.85 (2H, m), 3.12 25 (2H, t, J = 7.7 Hz), 3.31 (4H, m), 3.52 (2H, t, J = 7.7 Hz), 4.81 (2H, t, J = 7.7 Hz), 6.59 (1H, d, J = 15.8 Hz), 7.63 (1H, d, J = 15.8 Hz), 7.73 (1H, d, J = 8.8 Hz), 7.93 (1H, d, J =
8.8 Hz), 7.94 (1H, s) Example 31 30 Preparation of 3-[1-(3-isopropylamino-propy1)-2-(2,4,4-trimethyl-penty1)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (32) [0259] The titled compound (32) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: HPLC: 97.5%, tR = 1.68 min. LC-MS m/z: 415 ([M+H]+). 1H NMR (DMSO-d6) 5 0.89 35 (9H, s), 0.98 (3H, d, J = 6.6 Hz), 1.23 (6H, d, J = 6.5 Hz), 2.08-2.29 (4H, m), 2.27 (1H, m), 2.98-3.12 (4H, m), 3.29 (1H, m), 4.53 (2H, t, J = 7.4 Hz), 6.60 (1H, d, J
= 15.8 Hz), 7.65 (1H, d, J = 15.8 Hz), 7.75 (1H, d, J = 9.0 Hz), 7.96 (1H, d, J = 9.0 Hz), 7.98 (1H, s), 8.75 (2H, bs).
Example 32 Preparation of 342-(2,2-Dimethyl-propy1)-1-(3-isopropylamino-propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (33) [0260] The titled compound (33) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99%, tR = 1.01 min. LC-MS m/z: 375 ([M+Hr). 1H NMR (DMSO-d6) 80.98 (9H, s), 1.24 (6H, bs), 2.17 (2H, bs), 3.14 (4H, m), 3.28 (1H, bs), 4.53 (2H, bs), 6.65 (1H, d, J =
15.5 Hz), 7.65 (1H, d, J = 15.5 Hz), 7.81 (1H, d, J = 7.4 Hz), 8.02 (1H, s), 8.03 (1H, d, J
= 7.4 Hz), 8.85 (2H, bs).
Example 33 Preparation of 3-[1-(2-Diisopropylamino-ethyl)-2-(3,3,3-trifluoro-propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (34) [0261] The titled compound (34) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 97.5%;
tR =
0.93 min. LCMS (ESI) m/z: 427 ([M+H]). 1H NMR (DMSO-d6) 81.35 (12H, m), 2.94 (2H, m), 3.24 (2H, m), 3.45 (2H, t), 3.80 (211, m), 4.68 (2H, t), 6.48 (1H, m), 7.55 (3H, m), 7.85 (1H, m), 9.48 (1H, bs).
Example 34 Preparation of N-Hydroxy-342-isobuty1-1-(2-isopropylamino-ethyl)-1H-benzoimidazol-5-y1]-acrylamide (35) [0262] The titled compound (35) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 98.3%, tR = 0.51 min. LCMS (ESI) m/z: 345 ([M-I-H]). 1H NMR (CD30D) 8 7.78 (1H, d, J = 8.7 Hz), 7.76 (1H, s), 7.68 (1H, d, J = 8.6 Hz), 7.46 (1H, d, J =
15.8 Hz), 6.42 (1H, d, J = 15.9 Hz), 4.70 (2H, t, J = 7.4 Hz), 3.48 (2H, t, J = 6.9 Hz), 3.37 (1H, m), 3.01 (2H, d, J = 7.4 Hz), 2.21 (1H, m), 1.27 (6H, d, J = 6.5 Hz), 1.00 (6H, d, J = 6.6 Hz);
13C NMR (CD30D) 5 160.3, 155.3, 138.5, 134.1, 131.5, 124.2, 113.9, 111.4, 51.1, 42.0, 40.3, 33.4, 27.3, 20.6, 17.2.

Example 35 Preparation of 342-(2,2-Dimethyl-propy1)-1-(2-ethylamino-ethyl)-benzoimidazol-5-*N-hydroxy-acrylamide (36) [0263] The titled compound (36) was prepared according to the procedures described in Example 1, by using appropriate starting materials. Yield: 74%.
HPLC
purity at 254 nm: 99.9%, tR = 0.71 min. LCMS (ESI) m/z: 345 ([M+H]+). 1H NMR
(CD30D) 5 7.81 (1H, d, J = 8.6 Hz), 7.75 (1H, s), 7.69 (1H, d, J = 8.5 Hz), 7.36 (1H, d, J
= 15.7 Hz), 6.40 (1H, d, J = 15.3 Hz), 4.81 (2H, t, J = 6.4 Hz), 3.51 (2H, t, J = 6.3 Hz), 3.10 (2H, s), 3.06 (2H, qt, J = 7.3 Hz), 1.23 (3H, t, J = 7.2 Hz), 1.04 (9H, s); 13C NMR
(CD30D) 5 161.0, 153.3, 138.5, 132.7, 132.2, 124.2, 117.5, 113.9, 111.9, 44.2, 43.0, 41.0, 37.4, 33.0, 27.9, 9.5.
Example 36 Preparation of 3-[1-(2-Ethylami no-ethyl)-2-isobuty1-1H-benzoimidazol-5-yl]-N-hydroxy-acrylamide (37) [0264] The titled compound (37) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%, tR = 0.40 min. LCMS (ESI) m/z: 331 ([M+1-1]+). 1H NMR (CD30D) 6 7.81 (1H, d, J = 8.6 Hz), 7.73 (1H, s), 7.67 (1H, d, J = 8.2 Hz), 7.34 (1H, d, J =
15.7 Hz), 6.36 (1H, d, J = 15.7 Hz), 4.74 (2H, t, J= 6.7 Hz), 3.54 (2H, t, J= 6.5 Hz), 3.10 (211, d, J = 7.4 Hz), 3.06 (2H, d, J = 9.5 Hz), 2.21 (1H, m), 1.23 (3H, t, J = 7.3 Hz), 1.04 (6H, d, J = 6.6 Hz); 13C NMR (CD30D) 8 163.7, 161.1, 154.8, 138.6, 133.2, 132.6, 132.4, 124.2, 117.2, 113.9, 111.6, 44.4, 43.0, 40.5, 33.4, 27.3, 20.6, 9.5.
Example 37 Preparation of 341-(2-Diisopropylamino-ethyl)-2-(2,4,4-trimethyl-penty1)-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (38) [0265] The titled compound (38) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 99.0 %;
tR
1.62 min; LCMS (ESI) m/z: 443 ([M4-Hr). 1H NMR (CD30D) 6 7.96 ¨ 7.94 (m, 2H), 7.82 (d, J = 8.7 Hz, 1H), 7.55 (d, J = 15.8 Hz, 1H), 6.54 (d, J = 15.8 Hz, 1H), 5.13 ¨
5.06 (masked peaks), 4.01 ¨ 3.92 (m, 2H), 3.71 ¨ 3.67 (m, 2H), 3.33 ¨ 3,24 (masked peaks), 3.18 ¨ 3.12 (m, 1H), 2.38 ¨ 2.36 (m, 1H), 1.52 (s, 6H), 1.51 (s, 6H), 1.41 ¨ 1.40 (m, 2H), 1.09 (d, J = 6.6 Hz, 3H), 0.94 (s, 9H); 13C NMR (CD30D) 8 165.5, 156.5, 140.1, 134.8, 134.7, 134.0, 126.5, 120.0, 114.6, 113.6, 56.9, 51.7, 45.2, 42.0, 35.9, 31.9, 30.6, 30.2, 22.6, 18.3.

Example 38 Preparation of N-Hydroxy-311-(2-isopropylamino-ethyl)-2-(2,4,4-trimethyl-pentyl)-1H-benzoimidazol-5-yl]-acrylamide (39) [0266] The titled compound (39) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 97.9 %; tR = 1.49 min; LCMS (ESI) m/z: 401 ([M+H]+). 1H NMR (CD30D) 8 7.98 (d, J = 8.7 Hz, 1H), 7.79 - 7.76 (m, 2H), 7.24 (d, J = 15.7 Hz, 1H), 6.39 (d, J =
15.7 Hz, , 1H), 4.97 - 4.89 (masked peaks), 3.70 - 3.66 (m, 2H), 3.53 - 3.47 (m, 1H), 3.34 - 3.28 (masked peaks), 3.22 - 3.15 (m, 1H), 2.31 - 2.29 (m, 1H), 1.39- 1.38(m, 9H), 1.07(d, J = 6.6 Hz, 3H), 0.9 (s, 9H); 13C NMR (CD30D) 8 165.5, 156.9, 140.5, 134.7, 134.4, 126.3, 118.9, 115.9, 113.8, 53.2, 51..5, 44.2, 42.8, 35.7, 31.9, 30.9, 30.2, 29.6, 19.1, 18.8.
Example 39 Preparation of 341-(2-Ethylamino-ethyl)-2-(2,4,4-trimethyl-pentyl)-1H-benzoimidazol-5111-N-hydroxy-acrylamide (40) [0267] The titled compound (40) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 100.0%; tR = 1.57 min; LCMS (ESI) miz: 387 ([M+H]+). 1H NMR (CD30D) 8 7.96 (d, J = 8.6 Hz, 1H), 7.79 (s, 1H), 7.78 - 7.75 (d, J = 8.7 Hz, 1H), 7.23 (d, J =
15.7 Hz, 1H), 6.37 (d, J = 15.7 Hz, 1H), 4.96 - 4.89 (masked peaks), 3.70 - 3.68 (m, 2H), 3.36 - 3.28 (masked peaks), 3.26 - 3.14 (m, 3H), 2.31 - 2.30 (m, 1H), 1.40 - 1.32 (m, 5H), 1.07(d, J = 6.6 Hz, 3H), 0.92 (s, 9H); 13C NMR (CD30D) 8 165.6, 156.9, 140.6, 134.9, 134.5, 134.2, 126.2, 118.7, 116.0, 113.7, 51.6, 46.5, 45.0, 42.7, 35.8, 31.9, 30.8, 30.2, 22.6, 11.4.
Example 40 Preparation of 3-E1 -(2-D iethylam ino-ethyl)-2-(2,4,4-trimethyl-penty1)-1 H-benzoim idazol-5-yll-N-hydroxy-acrylam i de (41) [0268] The titled compound (41) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 85.6%, tR = 1.55 min. LC-MS m/z: 415 ([M+H]). 1H NMR (CD30D) a 7.91 (d, 2H, ,J
= 6.0 Hz), 7.80 (br, d, 1H, J = 8.9 Hz), 7.68 (d, 2H, J = 15.8 Hz), 6.58 (d, 1H, J = 15.8 Hz), 4.96 (br, q, 2H), 3.64 (br, q, 2H), 3.43 (q, 4H, J = 7.3 Hz), 1.40 (t, 8H), 1.09 (br, d, 4H, J = 6.6 Hz), 0.94 (br, s, 10H); 13C NMR (CD30D) 8 156.8, 140.4, 135.8, 134.4, 134.3, 126.1, 115.8, 113.2, 119.7, 119.2, 51.6, 50.3, 40.3, 35.8, 31.9, 22.6, 9Ø

Example 41 Preparation of 341-(2-Diethylamino-ethyl)-2-propy1-1H-benzoimidazol-5-yll-N-hydroxy-acrylamide (42) [0269] The titled compound (42) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254nm:
99.0%, tR = 0.68 min. LC-MS (ESI) miz: 345 ([M+H]). 1H NMR (CD30D) 8 8.15 (d, 2H, J= 8.7 Hz), 7.68 (d, 1H, J = 15.8 Hz), 6.63 (d, 1H, J = 15.8 Hz), 5.08 (br, t, 2H), 3.70 (br, t, 2H), 3.44 (br, m, 4H), 3.35 (t, 2H), 2.03 (br, m, 2H), 1.44 (t, 6H, J
= 7.2 Hz), 1.20 (t, 3H); 13C NMR (CD30D) 8 165.5,157.4, 139.8, 135.5, 133.5, 132.3, 120.7, 120.7, 114.5, 114.3, 40.8, 28.5, 21.0, 13.9, 9.1.
Example 42 Preparation of 3-[1-(2-Diethylamino-ethyl)-2-(2-methylsulfanyl-ethyl)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (45) [0270] The titled compound (45) was prepared according to the procedures described in Example 1, by using appropriate starting materials. Yield:17 mg (in two steps) as TFA salt. HPLC purity at 254 nm: 80%, tR = 0.50 min. LCMS (ESI) miz:

+ Hr). 1H NMR (CD300) 8 7.79 (1H, s), 7.77 (1H, d), 7.66 (1H, d, J = 8.6 Hz), 7.54 (1H, d, J = '15.8 Hz), 6.44 (1H, d, J = 15.8 Hz), 4.83 (2H, masked by DHO, identified by COSY), 3.57 (2H, m), 3.41 (2H, t, J = 7.1 Hz), 3.32 (4H), 3.01 (2H, t, J = 7.1 Hz), 2.89 (3H, s), 1.30 ¨1.25 (9H, overlapped t).
Example 43 Preparation of 342-Buty1-1-(2-isopropylamino-ethyl)-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (46) [0271] The titled compound (46) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 98.4%; tR = 1.56 min. LCMS m/z: 345 ([M+Hr). 1H NMR (DMSO-d6) 60.95 (3H, t), 1.22 (6H, m), 1.42 (2H, m), 1.80 (2H, m), 3.13 (2H, m), 3.41 (3H, t), 4.69 (2H, t), 6.58 (1H, m), 7.56 (1H, m), 7.73 (1H, m), 7.90 (2H, m), 9.14 (2H, bs).
Preapration of the freebase of the titled compound:
[0272] To a pre-stirred solution of the methyl ester (1 eq) in dried methanol, NH2OH.HCI (12 eq.) was added. The mixture was stirred in ice-water bath for about 10 min, followed by adding sodium methoxide solution (20 eq.). HPLC showed the reaction completed after 20 min, less than 1% of the acid was observed.

[0273] The above crude was treated with 1M of HCI until all the precipitate was dissolved (pH around 1-2). The pH value was carefully adjusted to around 7-8 using NaOH or NaHCO3, the precipitate which was formed was collected by filtration.
The solid was washed with water once. The above solid was suspended in methanol and 5 water again and was treated with 6N HCI until all dissolved, the pH value was carefully adjusted to around 7-8 using NaOH and NaHCO3. The precipitate, which was formed, was again collected by filtration; the freebase compound was obtained by drying in vacuo, the yield was around 80%-85%.
10 Preapration of the hydrochloric acid salt of the titled compound:
[0274] The above freebase compound was suspended in methanol and water and was treated with 6N HCI (2.8 eq.). The solution became clear. After removing the methanol on a Rotary Evaporator, the hydrochloric acid salt was obtained by freeze-drying. It was further recrystallized from methanol (HPLC purity at 254 nm: >
99%).
Example 44 Preparation of 342-Butyl-1-(3-isopropylamino-propy1)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (47) [0275] The titled compound (47) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 98.2%; tR = 1.72 min. LCMS (ESI) m/z: 359 ([MH]+). 1H NMR (DMSO-d6) 8 0.95 (3H, t), 1.22 (6H, m), 1.45 (2H, m), 1.82 (2H, m), 2.14 (2H, m), 3.17 (4H, m), 3.28 (1H, m), 4.52 (2H, t), 6.62 (1H, m), 7.57 (1H, m), 7.72 (1H, m), 7.89 (2H, m), 8.80 (2H, bs).
=
Example 45 Preparation of 341-(1-Benzyl-piperidin-4-y1)-2-butyl-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (48) [0276] The titled compound (48) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 96.7%, tR = 1.35 min. LC-MS m/z: 433 ([M+H]). 1H NMR (DMSO-d6) 6 0.94 (3H, s), 1.41 (2H, m), 1.77 (2H, m), 2.19 (2H, m), 2.99-3.10 (2H, m), 3.24 (4H, m), 3.68 (2H, m), 4.38 (2H, s), 5.01 (1H, m), 6.65 (1H, d, J = 15.8 Hz), 7.47-7.49 (3H, m), 7.61 (1H, d, J = 15.8 Hz), 7.69 (3H, m), 7.97 (1H, s), 8.60 (1H, d, J = 8.8 Hz), 10.35 (2H, s), 11.95 (1H, s).

Example 46 Preparation of 342-B utyl-1-(2-ethylam no-ethyl)-1H-benzoimidazol-5-yll-N-hydroxy-acrylamide (44) [0277] The titled compound (44) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm:
98%;
LC-MS m/z: 331 ([M+H]). 1H NMR (DMSO-d6) 6 10.88 (br s, 1H), 9.12 (br s, 2H), 7.93 (s, 1H), 7.87 (d, 1H, J = 8.4 Hz), 7.71 (d, 1H, J = 8.3 Hz), 7.62 (d, 1H, J =
15.7 Hz), 6.59 (d, 1H, J = 15.6 Hz), 4.67 (t-like, 2H), 3.42 (br s, 2H), 3.08 (q, 2H, J
= 7.7 Hz, Pr-CH2), 3.05 (br s, 2H), 1.81 (m, 2H), 1.45 (m, 2H), 1.18 (t, 3H, J = 7.1 Hz), 0.95(t, 3H, J
= 7.0 Hz); 130 NMR (DMSO-d6) 5 162.6, 156.2, 138.0, 135.0, 133.5, 131.6, 123.5, 119.2, 114.8, 112.1, 44.5, 42.4, 40.6, 28.2, 25.2, 21.7, 13.5, 10.8.
Example 47 Preparation of 342-But-3-eny1-1-(2-ethylamino-ethyl)-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (49) [0278] The titled compound (49) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 99.0 %;
tR =-1.61 min; LCMS m/z: 329 ([M+H]). 1H NMR (CD30D) 8 7.85 (d, J = 8.5 Hz, 1H), 7.78 (s, 1H), 7.72 (d, J = 8.5 Hz, 1H), 7.38 (d, J = 15.7 Hz, 1H), 6.40 (d, J =
15.5 Hz, 1H), 6.02 ¨ 5.92 (m, 1H), 5.19 (dd, J = 17.1, 1.3 Hz, 1H), 5.12 (dd, J = 10.2, 0.9 Hz, 1H), 4.80 (t, J = 6.4 Hz, 2H), 3.62 (t, J = 6.2 Hz, 2H), 3.22 ¨ 3.16 (m, 2H), 2.71 (q, J = 7.2 Hz, 2H), 1.35 (t, J = 7.2 Hz, 3H); 130 NMR (CD30D) 8 178.3, 157.1, 140.7, 136.5, 133.9, 125.9, 118.8, 117.6, 116.2, 113.2, 101.5, 67.6, 46.4, 44.9, 42.4, 31.6, 26.7, 20.7, 11.4.
Example 48 Preparation of 342-Hexy1-1-(2-isopropylamino-ethyl)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (50) [0279] The titled compound (50) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 94.4%, tR = 1.32 min. LCMS (ESI) m/z: 373 ([M+H]). 1H NMR (CD30D) 5 7.80 (1H, d, J = 8.5 Hz), 7.74 (1H, s), 7.64 (1H, d, J = 9.0 Hz), 7.50 (1H, d, J =
13. 6 Hz), 6.42 (1H, d, J = 15.8 Hz), 4.65 (2H, d, J = 6.6 Hz), 3.48 (2H, d, J = 6.6 Hz), 3.38 (1H, qt, J = 6.5 Hz), 3.13 (2H, t, J = 5.9 Hz) 1.82 (2H, t, J = 6.7 Hz), 1.44 (2H, t, J = 7.0 Hz) 1.29 (7H, m) 0.84 (6H, d, J = 7.0 Hz).

Example 49 Preparation of 3-[1-(2-Dimethylamino-ethyl)-2-(2,4,4-trimethyl-penty1)--1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (51) [0280] The titled compound (51) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 100%, tR = 1.49 min. LC-MS m/z: 331 ([M+H]). 1H NMR (DMSO-d6) 60.85 (9H, s), 1.03 (2H, d, J = 6.4 Hz), 1.34 (2H, m), 2.27 (1H, m), 3.00 (6H, s), 3.24-3.27 (4H, m), 4.79 (3H, m), 6.53 (1H, d, J = 15.72 Hz), 7.62 (1H, d, J = 15.7 Hz), 7.75 (1H, d, J = 8.4 Hz), 7.86 (1H, s), 7.87 (1H, d, J = 8.4 Hz).
Example 50 Preparation of 341-(2-Ethylamino-ethyl)-2-hexy1-1H-benzoimidazol-5-y13-N-hydroxy-acrylamide (52) [0281] The titled compound (52) was prepared according to the procedures described in Example 1, by using appropriate starting materials. The modified or detailed procedures were described as below.
Step 3:
[0282] To a stirred solution of 344-(2-ethylamino-ethylamino)-3-nitro-phenylFacrylic acid methyl ester (8.174 g, 27.87 mmol) and heptaldehyde (4.85 g, 42.47 mmol, 1.52 eq) in AcOH and Me0H (1:9 v/v, 300mL) was added SnC122H20 (31.45 g, 139.4 mmol, 5 eq) in portions. The resulting mixture was heated to 40 C with stirring.
The progress of the reaction was monitor by LC/MS. When the reaction was completed, solvent was removed under reduced pressure below 40 C. The resultant residue was diluted with Et0Ac (50 mL) then basified (pH >10) with saturated aqueous Na2CO3 and extracted with dichloromethane (x3). Filtration may be needed to remove the white precipitates or suspension derived from Tin in order to get clearly separated layers. The organic extracts were combined, dried (Na2SO4), filtered, and evaporated to dryness.
The resulting oily residue was purified by flash column chromatography (silica, 4)67 x 65 mm, solvent Me0H/DCM gradient from 0 to 10%). 341-(2-ethylamino-ethyl)-2-hexyl-1H-benzoimidazol-5-y11-acrylic acid methyl ester was obtained as yellow solid (4.445 g, 44.6%). HPLC purity at 254 nm: 98.8%, tR = 1.71 min. LCMS (ESI) m/z: 358 (RA +
Hr).
1H NMR (CDCI3) 8 7.88 (1H, d, J = 1.2 Hz), 7.83 (1H, d, J = 16.0 Hz), 7.43 (1H, dd, J =
8.4, 1.4 Hz), 7.33 (1H, d, J = 8.4 Hz), 6.43 (1H, d, J = 15.9 Hz), 4.22 (1H, t, J = 6.6 Hz), 3.80 (3H, s), 3.01 (2H, t, J = 6.6 Hz), 2.89 (2H, t, J = 7.9 Hz), 2.65 (2H, q, J = 7.1 Hz), 1.91 (2H, pentet, J = 7.8 Hz), 1.46 (2H, m), 1.35 (4H, m), 1.07 (3H, t, J =
7.1 Hz), 0.90 (3H, t, J = 7.0 Hz). The solid could be recrystallized from Hexanes-ether to give a white or pale yellow solid with HPLC purity at 254 nm: 99.2%.

[0283] In another experiment starting with 2.725 g of 3-[4-(2-ethylamino-ethylamino)-3-nitro-pheny1]-acrylic acid methyl ester, the titled compound was obtained in 52.8%
yield (1.753 g).
Step 4:
[0284] To a solution of 341-(2-ethylamino-ethyl)-2-hexy1-1H-benzoimidazol-5-y1]-acrylic acid methyl ester (4.428 g, 12.39 mmol) and NH201-11-1C1 (8.66 g, 124.7 mmol) in dry Me0H (50 mL) which was stirred and cooled in a dry-ice acetone bath, added Na0Me solution in Me0H (25%, 4.37 M, 55 mL, 240 mmol). The reaction mixture was then stirred at room temperature. The progress of reaction was monitored by LC/MS
(usually reaction completed within 30-90 min) and quenched by adding 6N HCI
(40 mL). The mixture (HPLC purity at 254 nm = 94.6%) was added Milli-Q water, adjusted pH -8 by 1N NaOH and evaporated to remove the organic solvent. The resultant residue was washed with Milli-Q water (x3) and re-dissolved in Me0H-DCM, the solution was filtered and diluted with Milli-Q water. The suspension was evaporated to remove the organic solvent and the resultant residue was washed with Milli-Q
water (x2). The free base of the titled compound was obtained (HPLC purity at 254 nm =
98%). The free base could be recrystallized from Me0H-Ethyl acetate to give a white or pale yellow solid.
Step 5: hydrochloric acid salt formation.
[0285] The above freebase was dissolved in Me0H and excess 6N HCI (final pH
<2) and the clear solution was evaporated to dryness and then diluted with Me0H, co-evaporated with PhMe (x1) and Et0Ac (x2). The solid was recrystallized from Me0H-Et0Ac to give a white or pale yellow solid (3.298 g, 61.7%). HPLC purity at 254 nm:
98.4-99.6%, tR = 1.23 min. LCMS (ESI) m/z: 359 ([M + H]+). 1H NMR (CD30D) 5 9.33 (residual NH), 8.03 (1H, d, J = 8.3 Hz), 7.77 (1H, s), 7.73 (1H, d, J = 8.2 Hz), 7.16 (1H, d, J = 15.7 Hz), 6.34 (1H, d, J = 15.7 Hz), 4.88 (2H, overlapped with DHO, identified by COSY), 3.63 (2H, br t like), 3.32 (2H, d, J = 7.9 Hz), 3.15 (2H, q, J = 7.1), 1.94 (2H, pentet, J = 7.1), 1.53 (2H, pentet, J = 6.7 Hz), 1.42-1.31 (4H, m), 1.33 (3H, t, J = 7.1 Hz), 0.88 (3H, t, J = 7.0 Hz); 13C NMR (CD300) 5 163.4, 155.8, 138.1, 133.0, 132.0, 130.3, 125.1, 117.4, 112.8, 112.5, 44.5, 43.2, 41.1, 30.5, 28.0, 25.3, 25.2, 21.6, 12.4, 9.6.

Example 51 Preparation of N-Hydroxy-341-(2-isopropylamino-ethyl)-2-(3,3,3-trifluoro-propy1)-1H-benzoimidazol-5-y1Facrylamide (53) [0286] The titled compound (53) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 98.1%;
tR =
0.63 min. LC-MS m/z: 385 ([1v1+H]+).
Example 52 Preparation of 341-(2-Dimethyla mino-ethyl)-2- hex-3-eny1-1 H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (54) [0287] The titled compound (54) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 99.9%, tR = 0.96 min. LCMS (ESI) m/z: 357 ([M+H]1). 1H NMR (CD30D) 8 7.87 (1H, d, J = 8.6 Hz), 7.80 (1H, d, J = 8.8 Hz), 7.72 (1H, d, J = 8.3 Hz), 7.49 (1H, d, J =
15.8 Hz), 6.44 (1H, d, J = 15.8 Hz), 5.44 (1H, m), 5.38 (1H, m), 4.84 (2H, t, J = 6.1 Hz), 3.61 (2H, t, J = 7.7 Hz), 3.20 (2H, t, J = 4.2 Hz) 2.97 (6H, s), 2.61 (4H, qt, J = 7.1 Hz), 1.93 (2H, qn, J = 7.7 Hz), 0.78 (3H, t, J = 7.5 Hz); 13C NMR (CD30D) 8 163.6, 160.0, 155.1, 138.1, 134.1, 133.1, 131.9, 131.6, 124.7, 123.9, 118.2, 117.2, 114.3, 113.1, 111.8, 53.2, 42.1, 38.8, 24.8, 23.3, 19.4, 12.4.
Example 53 Preparation of 341-(2-Amino-ethyl)-2-(2,4,4-trimethyl-pentyl)-1H-benzoimidazol-y1]-N-hydroxy-acrylamide (55) SnC12.2H20 N e ga _v __ ( HOAc-Me0H (1:9) \
HN, HN,Boc Illal Boc INJe N
HCl/Me0H ( NH2OH/Na0Me ( NHOH
N

Via-1 H2N Vila-1 Step 1:
[0288] To a stirred solution of 344-(2-tert-Butoxycarbonylamino-ethylamino)-3-nitro-phenylFacrylic acid methyl ester (111a1, 65.2 mg, 0.178 mmol) and 3,5,5-trimetylhexanal (45 AL, 0.26 mmol) in a mixed solvent of Ac0H-Me0H (1:9 v/v, 2 mL) and DCM (1 mL) was added SnC12-2H20 (184 mg, 0.815 mmol). The resulting mixture was heated to C with stirring overnight. The solvent was removed under reduced pressure and the resultant residue was added saturated aqueous Na2CO3 and extracted with Et0Ac 5 (x3). The extracts gave the crude (Vial-1, 91 mg) with HPLC purity at 254 nm: 49.3%, tR = 3.02 min and 7.9%, tR = 1.97 min (de-Boc product). LCMS (ESI) m/z: 458 (IM
Hr) and 358 ([M + de-Boc product).
Step 2:
10 [0289] The above crude (Vial-1) was dissolved in Me0H (4 mL) and 6N HCI
(1 mL) and heated at 70 C for 30 min. The solution was evaporated to dryness and co-evaprote dwith PhMe (x2) and Me0H (x1). The residue (crude Vla-1, 81.9 mg) was spilt to two parts (43.4 mg, equal to 0.0945 mmol of Mat and 38.5 mg equal to 0.0839 mmol of !Hai).
Step 3:
[0290] The titled compound (55) was prepared according to the Step 4 described in Example 1, by using crude (Via-I, 38.5 mg). VIla-1 was obtained as TFA salt (2.3 mg, 4.7% from 111a1). HPLC purity at 254 nm: 92.7%, tR = 1.46 min. LCMS (ESI) m/z:

([M + H]+). 1H NMR (CD30D) 8 7.81 (1H, s), 7.70 (1H, d, J = 8.6 Hz), 7.65 (1H, d, J =
8.4 Hz), 7.59 (1H, d, J = 15.8 Hz), 6.47 (1H, br d, J = 14.6 Hz), 4.63 (2H,t, J = 5.4 Hz), 3.38 (2H, t, J = 6.5 Hz), 3.02 (1H, dd, J = 15.5, 6.5 Hz), 2.90 (1H, dd, J =
15.3, 8.6 Hz), 2.20 (1H, br s or m), 1.33 (1H, dd, J = 14.1, 3.4 Hz), 1.25 (1H, dd, J = 14.0, 6.6 Hz), 0.98 (3H, d, J = 6.2 Hz), 0.83 (9H, s).
Example 54 Preparation of 341-(2-Amino-ethyl)-2-(2-methoxy-nony1)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (56) [0291] The titled compound (56) was prepared according to the procedures described in Example 53, by using appropriate starting materials. HPLC purity at 254 nm: 91.8%, tR = 1.93 min. LCMS (ESI) m/z: 403 UM + Fin. 1H NMR (CD30D) 8 some , identified peaks: 7.81 (1H, s), 7.70 - 7.58 (3H, m), 6.46 (1H, br d, J =
14.4 Hz), 4.62 (2H, m), 3.69 (1H, br s or m), 3.38 (2H, t, J = 7.3 Hz), 1.67 (1H, m), 1.56 (1H, m), 1.50-1.20 (10H, m), 0.82 (3H, t, J = 6.2 Hz).

Example 55 Preparation of 342-Butyl-1-(2-dimethylamino-ethyl)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (57) [0292] The titled compound (57) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 100%, tR = 0.42 min. LC-MS m/z: 331 (WI H]+). 1H NMR (DMSO-d6) 5 0.97 (3H, t, J = 7.3 Hz), 1.49 (3H, m), 1.83 (2H, m), 3.09 (2H, t, J = 7.72 Hz), 3.54 (2H, t, J = 7.6 Hz), 4.74 (2H, t, J = 7.6 Hz), 6.57 (1H, d, J = 15.7 Hz), 7.62 (1H, d, J =
15.7 Hz), 7.71 (1H, d, J = 8.6 Hz), 7.93 (1H, d, J = 8.6 Hz), 7.97 (1H, s), 10.68 (2H, bs).
Example 56 Preparation of 342-Hexy1-1-(2-dimethylamino-ethyl)-1H-benzoimidazol-5-y1141-hydroxy-acrylamide (58) [0293] The titled compound (58) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 100%, tR = 0.42 min. LC-MS m/z: 359 (EM + Hr). 1H NMR (DMSO-d6) 8 0.89 (3H, t, J = 6.9 Hz), 1.28-1.54 (6H, m), 1.85 (2H, m), 2.92 (6H, s), 3.09 (2H, t, J =
7.6 Hz), 3.51 (2H, t, J = 7.8 Hz), 4.76 (2H, t, J = 7.8 Hz), 6.57 (1H, d, J = 15.8 Hz), 7.63 (1H, d, J =
15.8 Hz), 7.70 (1H, d, J = 8.6 Hz), 7.90 (1H, d, J = 8.6 Hz), 7.91 (1H, s), 10.68 (2H, bs).
Example 57 Preparation of 3-{1-(2-Diethylamino-ethyl)-242-(2,2-dimethyl-propionylamino)-ethyl]-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (61) [0294] The titled compound (61) was prepared according to the procedures =
described below, Steps 1 & 2 were performed as in Scheme I:
Step 3:
02 N v,,, H2N io HN
HN
AcOH, Me0H, r.N

rr 61-2 [0295] To a pre-stirred solution of 344-(2-diethylamino-ethylamino)-3-nitro-pheny1]-acrylic acid methyl ester (61-1, 280 mg, 1.0 mmol) in glacial acetic acid (5 mL), tin chloride was added (1.18 g, 10.0 mmol). The resulting solution was heated to 45 C for 17 hours and then cooled to room temperature. The solvent was removed under vacuum. Water (20 mL) and dichloromethane (20 mL) was added to the residue and stirred for 30 minutes. The organic layer was dried (MgSO4), filtered and concentrated to an oily residue. 100 mL diethyl ether was added and stirred for 4 hours.
The product 3-[3-amino-4-(2-diethylamino-ethylamino)-phenyl]-acrylic acid methyl ester was obtained in 54.9% yield (207.6 mg). LCMS m/z: 292 ([M+H]).
Step 4 H2N Fmoc. N
HN 1W-P 0"
EDC, HOBt.H20, H HN CO2Me z_Th.e0F1 DrolEAon temp. ; DCMp. HN 111V
W
r 0 H 0 61-2 614 r N OA
[0296] To a pre-stirred solution of 343-amino-4-(2-diethylamino-ethylamino)-phenyl]-acrylic acid methyl ester (61-2, 1.93 g, 6.65 mmol) and dichloromethane (13.3 mL) was added a cocktail solution of N-(3-dimethylaminopropy1)-N1-ethylcarbodiimide hydrochloride (2.55 g, 13.31 mmol), 1-hydroxybenzotriazole hydrate (2.04 g, 13.31 mmol), N,N-diisopropylethylamine (2.20 mL, 13.31 mmol) and dichloromethane (26.6 mL). After stirring for 0.5h, Fmoc-Gly-OH (61-3, 2.97 g, 9.98 mmol) was added.
When the starting material has fully reacted, ethyl acetate (100 mL) was added to dilute the mixture. The organic contents were washed with saturated sodium hydrogencarbonate (2 x 25 mL) and brine (2 x 25 mL), before drying in sodium sulphate. The mixture was then filtered and concentrated in vacuo. The product 3-[3-amino-4-(2-diethylamino-ethylamino)-phenyl]-acrylic acid methyl ester was obtained in 67.3% yield (2.54 g).
LCMS m/z: 571 ([M+H]).
Step 5 Fmoc,NO
HN CO2Me AcOH, 70 C Fmoc¨NH N 40 CO2Me HN
r1-4 I I 61-5 [0297] Glacial acetic acid (8.9 mL) was added into 313-amino-4-(2-diethylamino-ethylamino)-phenyl]-acrylic acid methyl ester (61-4, 2.54 g, 4.46 mmol) and the reaction mixture was stirred at 70 C for 14h. When the reaction has completed, the mixture was concentrated in vacuo. Saturated sodium hydrogencarbonate (20 mL) was added and dicholoromethane (3 x 20 mL) was used to extract the aqueous layer.
The combined organic contents were dried in sodium sulphate before being filtered and concentrated in vacuo. The product 3-{1-(2-dethylamino-ethyl)-2-[(9H-fluoren-9-ylmethoxycarbonylamino)-methyl]-1H-benzoimidazol-5-y1}-acrylic acid methyl ester (61-5) was obtained in 66.1 % (1.62 g). LCMS m/z: 553 ([M+H]).
Step 6 Fmoc¨NH N CO2Me H2N N io .02.
piperidine, DCM, rm temp 1N h [0298] To a pre-stirred solution of 3-{1-(2-dethylamino-ethyl)-2-[(9H-fluoren-ylmethoxycarbonylamino)-methy1]-1H-benzoimidazol-5-y1}-acrylic acid methyl ester (61-5, 1.62 g, 2.94 mmol) and dichloromethane (8.90 mL) was added piperidine (1.45 mL, 14.69 mmol). When the reaction has completed, the mixture was concentrated iin vacuo. The desired product was separated by reverse phase preparative HPLC.
After lyopholyzation, 0.52 g (53.6 %) of 342-aminomethy1-1-(2-diethylamino-ethyl)-1H-benzoimidazo1-5-y1]-acrylic acid methyl ester was obtained as powder. LCMS
rn/z: 331 ([M+H]+).
Step 7 H2N N CO2Me 2¨NH N .02.
I>, DIEA, DCM
r r61-6 61-7 [0299] To a pre-stirred solution of 3-[2-aminomethy1-1-(2-diethylamino-ethyl)-benzoimidazol-5-y1]-acrylic acid methyl ester (61-6, 0.10 g, 0.23 mmol), N,N-diisopropylethylamine (97 pL, 0.58 mmol) and dichloromethane (1.17 mL) was added 2,2-dimethyl-propionyl chloride (34.6 pL, 0.28 mmol) and the resulting reaction mixture was stirred at room temperature for 1 h. When the reaction has completed, ethyl acetate (20 mL) was added to dilute the mixture. The organic contents were washed with saturated sodium hydrogencarbonate (2 x 20 mL) and brine (2 x 20 mL), before drying in Na2SO4. The mixture was filtered and concentrated in vacuo. The product 3-{1-(2-diethylami no-ethyl)-2-[(2,2-di methyl-propionylamino)-methy1]-1H-benzoim idazol-5-yI}-acrylic acid methyl ester (61-7) was obtained in 76.6 % (74.1 mg). LCMS
m/z: 415 ([M+H]).
Step 8 N
CO2Me H N
NH
NH2OH.HCI, /Z¨N\ _______________________________ </N 010 OH
Na0Me, Me0Hir r - 78 C
I I 61-7 r 61 [0300] To a stirred solution of 3-{1-(2-diethylamino-ethyl)-24(2,2-dimethyl-propionylamino)-methyl]-1H-benzoimidazol-5-y1}-acrylic acid methyl ester (61-7, 73.8 mg, 0.18 mmol) and hydroxylamine hydrochloride (124 mg, 1.78 mmol) in Me0H
(0.3 mL) was added sodium methoxide (30% in methanol) (0.8 mL, 3.6 mmol) at ¨ 78 C.
The reaction mixture was then allowed to warm up slowly to room temperature.
The reaction was monitored by LC/MS and was completed in around 15 min. IN HCI was then added slowly into the reaction mixture at 0 C. The desired product was separated by reverse phase preparative HPLC. After lyopholyzation, 22.2 mg (24.3 %) of 3-{1-(2-diethylamino-ethyl)-2-[(2,2-dimethyl-propionylamino)-methyl]-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide was obtained as powder. HPLC purity: 99.5%, tR = 0.94min.

LCMS m/z: 416 ([M+Hr). 1H NMR (CD30D) 5 7.89 (s, 1H), 7.84 (d, J = 8.5 Hz, 1H), 7.73 (d, J = 8.4 Hz, 1H), 7.55 (d, J= 15.8 Hz, 1H), 6.53 (d, J= 15.8 Hz, 1H), 4.98 (t, J=
7.3 Hz, 2H), 4.73 (s, 2H), 3.75 (t, J = 7.5 Hz, 2H), 3.42 (q, J = 7.2 Hz, 4H), 1.37 (t, J =
7.3 Hz, 6H), 1.22 (s, 9H); 13C NMR (CD30D) 8 182.5, 168.9, 162.2, 161.9, 154.8, 140.8, 137.9, 135.0, 133.9, 126.0, 119.3, 117.1, 112.9, 50.9, 40.5, 39.7, 36.7, 27.6, 9.1. =
Example 58 Preparation of N-{2-[1-(2-Diethylamino-ethyl)-5-(2-hydroxycarbamoyl-viny1)-1H-benzoimidazol-2-y11-ethyl}-3,3-dimethyl-butyramide (59) [0301] The titled compound (59) was prepared according to the procedures described in Example 57, by using appropriate starting materials. HPLC purity at 254 nm: 94.0%; tR = 0.99 min. LC-MS m/z: 444 DA +

Example 59 Preparation of N-[1-(2-Diethylamino-ethyl)-5-(2-hydroxycarbamoyl-viny1)-1H-benzoimidazol-2-ylmethyli-butyramide (62) [0302] The titled compound (62) was prepared according to the procedures 5 described in Example 57, by using appropriate starting materials. HPLC
purity at 254 nm: 85.1 %; tR = 0.58 min; LCMS m/z: 402 ([M + H]4). 1H NMR (CD30D) 8 7.88 ¨
7.56 (m, 2H), 7.73 (s, 1H), 7.60 (d, J = 15.8 Hz, 1H), 6.51 (d, J = 15.8 Hz, 1H), 4.99 ¨ 4.79 (m, masked peaks), 4.81 (s, 2H), 3.74 (t, J = 7.8 Hz, 2H), 3.46 ¨ 3.41 (m, 4H), 2.31 (t, J
= 7.4 Hz, 2H), 1.39 (t, J = 7.2 Hz, 6H), 0.95 (t, J = 7.4 Hz, 3H); 13C NMR
(CD300) 8 10 117.1, 165.9, 154.6, 140.9, 129.6, 128.4, 127.3, 125.9, 118.6, 112.8, 111.5, 50.7, 40.4, 38.4, 36.4, 19.9, 14.0, 9Ø
Example 60 Preparation of 342-(3,3-Dimethyl-buty1)-1-(2-ethylamino-ethyl)-1H-benzoimidazol-15 5-y1J-N-hydroxy-acrylamide (63) [0303] The titled compound (63) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 99.0 %;
tFt =
0.93 min; LCMS m/z: 359 ([M + Hr). 1H NMR (CD30D) 8 7.5 (d, J = 8.4 Hz, 1H), 7.75 ¨7.74 (m, 2H), 7.16 (d, J = 15.7 Hz, 1H), 6.31 (d, J = 15.7 Hz, 1H), 4.89 (brs, 2H), 3.72 20 (brs, 2H), 3.29 ¨ 3.18 (m, 4H), 1.90 ¨ 1.86 (m, 2H), 1.35 (t, J = 7.1 Hz, 3H), 1.09 (s, 9H); 13C NMR (CD30D) 5 165.7, 158.4, 140.4, 134.9, 134.5, 134.2, 126.2, 122.5, 119.2, 115.6, 113.4, 55.3, 44.0, 40.8, 40.7, 31.3, 29.3, 22.9.
Example 61 25 Preparation of 341-(2-Dimethylamino-ethyl)-2-(3,3-dimethyl-buty1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (64) [0304] The titled compound (64) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC: 99.0 %;
tR =
0.83 min; LCMS m/z: 359 ([M + 1H NMR (CD30D) 5 7.94 (d, J = 7.8 Hz, 1H), 7.81 30 (s, 1H), 7.73 (d, J = 7.9 Hz, 1H), 7.42 (d, J = 15.7 Hz, 1H), 6.64 (d, J
= 15.7 Hz, 1H), 4.93 (brs, 2H), 3.76 (brs, 2H), 3.22 (t, J = 7.7 Hz, 2H), 3.09 (s, 6H), 1.91 ¨
1.87 (m, 2H), 1.08 (s, 9H); 13C NMR (CD30D) 8 165.4, 158.4, 140.2, 134.5, 134.2, 133.2, 126.5, 118.8, 115.3, 113.9, 46.4, 45.1, 42.9, 40.6, 31.3, 29.2, 22.9, 11.4.
35 Example 62 Preparation of 341-(2-Dimethylamino-ethyl)-2-pentyl-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (65) [0305] The titled compound (65) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 98.5%; tR = 0.78 min. LCMS m/z: 345([M + H]). 1H NMR (DMSO-d6) 8 0.89 (3H, m), 1.38 (4H, m), 1.83 (2H, m), 2.93 (6H, s), 3.04 (2H, m), 3.50 (2H, t), 4.70 (2H, m), 6.55 (1H, d), 7.57 (1H, d), 7.61 (1H, m), 7.81 (2H, m), 10.42 (1H, bs).
Example 63 Preparation of 341-(2-Dimethylamino-ethyl)-2-(2,2,2-trifluoro-ethyl)-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (64) [0306] The titled compound (64) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 91.1%; tR = 0.68 min. LCMS m/z: 357 ([M+Fi]+).
Example 64 Preparation of 341-(2-Ethylamino-ethyl)-2-penty1-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (68) [0307] The titled compound (68) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 98.4%; tR = 0.87 min. LCMS m/z: 345([M+H])-Example 65 Preparation of N-Hydroxy-341-(2-isopropylamino-ethyl)-2-penty1-1H-benzoimidazol-5-y1]-acrylamide (71) [0308] The titled compound (71) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 97.4%; tR = 0.95 min. LCMS m/z: 359 (DM + Hr). 1H NMR (DMSO-d6) 8 0.89 (3H, m), 1.22 (6H, d), 1.38 (4H, m), 1.82 (2H, m), 2.99 (3H, m), 4.56 (2H, m), 6.51 (1H, d), 7.59 (2H, d), 7.64 (1H, m), 7.88 (1H, m), 8.74 (2H, bs).
Example 66 Preparation of 342-Hexy1-1-(2-methylamino-ethyl)-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (74) [0309] The titled compound (74) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 96.0%, tR = 1.12 min. LCMS m/z: 345 ([M+H]+). 1H NMR (CD30D) 8 7.76 (2H, s), 7.70 (1H, d, J = 8.6 Hz). 7.50 (1H, d, J = 15.7 Hz), 6.43 (1H, d, J = 15.7 Hz), 4.81 (2H, d, J = 5.7 Hz), 3.49 (2H, bs), 3.15 (2H, dt, J = 4.8 Hz), 2.71 (3H, s), 1.85 (2H, qn, J =

5.1 Hz), 1.46 (2H, m), 1.33 (4H, m), 0.85 (3H, t, J = 7.1 Hz); 13C NMR (CD300) 163.7, 157.8, 138.5, 132.7, 124.2, 117.6, 113.7, 111.2, 40.2, 32.2, 30.5, 28.0, 25.6, 25.1, 21.6, 12.3.
Example 67 Preparation of N-Hydroxy-341-(2-methylamino-ethyl)-2-penty1-1H-benzoimidazol-5-y1]-acrylamide (75) [0310] The titled compound (75) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity at 254 nm: 97.8%; tR = 0.80 min. LCMS m/z: 331 (EM + H]+). 1H NMR (DMSO-d6) 8 0.89 (3H, m), 1.38 (4H, m), 1.84 (2H, m), 2.51 (3H, s), 3.14 (2H, m), 3.38 (2H, t), 4.70 (2H, m), 6.57 (1H, d), 7.62 (1H, d), 7.73 (1H, m), 7.96 (2H, m), 9.13 (2H, s).
Example 68 Preparation of 3-(2-Buty1-1-pyrrolidin-3-y1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (69) 02N io 0 OMe 0 OMe 02N is OMe Boc HN
CI Et3N SnC12, Me0H/ AcOH
la Heat IEloc I3oc HCl/Me0H OMe /
NH2OH NHOH, Step1 [0311] To a solution of methyl trans-4-Chloro-3-nitrocinnamate (la, 4.8 g, 20 mmol) in triethyl amine (5.5 mL, 40 mmol) was added 3-Amino-pyrrolidine-1-carboxylic acid tert-butyl ester (11.2 g, 60 mmol), the resulting mixture was then heated to 100 C
for 8 hours, then another portion of methyl trans-4-Chloro-3-nitrocinnamate (4.8 g, 20 mmol) and triethyl amine (5.5 mL, 40 mmol) was added, the resulting mixture was allowed to stir overnight at 100 C, then reaction was quenched by adding 200 mL of DCM
and 80 mL of 1M HCI solution. After separation of DCM layer, the aqueous solution was extracted with DCM one more time, and combined with previous DCM solution, which was then washed with brine, dried over sodium sulfate, then filtered through silica gel short column, and rinsed with ethyl acetate and hexanes mixture (2:1) until the orange color band was completely rinsed down. After removal of solvent under reduced pressure, the residue 69-2 was obtained (around 80% of yield in most of cases) as orange solid, which is pure enough (95% purity from HPLC) for next step. LC-MS
m/z:
292 ([M-Boc +H]).
Step 2 [0312] To a solution of compound 69-2 (7.84 g, 20.0 mmol) in 100 mL of Me0H
and AcOH mixture (1:9) was added corresponding aldehyde (3.0 mL, 30.0 mmol) and tin chloride (22.6 g, 100 mmol), the resulting mixture was stirred at 42 C for 24 hrs. Then the mixture was diluted using ethyl acetate (300 mL) at room temperature, and was then quenched with sat. sodium carbonate (30 mL). The resulting mixture was stirred for additional 1 hour, then organic layer was decanted to another conic flask.
Solid left in reaction flask was suspension with another portion of ethyl acetate (300 mL), which was then decanted and combined with previous portion of ethyl acetate and was then filtered through silica gel short column and rinsed with ethyl acetate, after removal of filtrate under reduced pressure, the residue was pure enough for next step and also could be purified on column (hexanes:Et0Ac = 1:2) to give a pale-yellow solid 69-3 (3.8 g, 44%). LC-MS m/z: 456 (EM + H]+).
Step 3 [0313] To a flask charged with compound 69-3 (456 mg, 1 mmol) was added 1.25 M

HCI in Me0H (4 mL), the resulting mixture was then heated to reflux for 2 hours, which was then evaporated to dryness under reduced pressure to give compound 4 as HCI
salt, which is pure enough for next step without any purification. LC-MS m/z:
356 ([M +
Fi]).
Step 4 [0314] To a solution of above crude 69-4 (around 0.16 mmol) product in Me0H
(0.5 mL) was added a pre-prepared NH2OH stock solution (2.0 M, 2 mL). The resulting mixture was stirred at room temperature for 2 hrs. After quenching with TFA
(0.4 mL), the resulting mixture was subjected to HPLC purification to afford 25 mg of 3-(2-Buty1-1-pyrrolidin-3-y1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide. HPLC purity:
98%; LC-MS m/z: 329 ([M + H]+). 1H NMR (CD30D) 8 0.95 (3H, t, J = 7.2 Hz), 1.46 (2H, m), 1.77 (2H, m), 2.52-2.82 (2H, m), 3.10-3.17 (2H, m), 3.48 (1H, m), 3.80 (2H, m), 5.55 (1H, m), 6.48 (1H, d, J = 16.0 Hz), 7.58 (1H, d, J= 16.0 Hz), 7.67 (1H, d, J= 8.0 Hz), 7.78-7.92 (2H, m).

Example 69 Preparation of 3-(2-Buty1-1-piperldin-4-y1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (70) [0315] The titled compound (70) was prepared according to the procedures described in Example 78, by using appropriate starting materials. HPLC purity:
98%;
LCMS m/z: 343 ([M + Hr). 1H NMR (CD30D) 6 0.96 (3H, t, J= 7.2 Hz), 1.46 (2H, m), 1.79 (2H, m), 2.21 (2H, m), 2.82 (2H, m), 3.10-3.17 (2H, m), 3.26 (1H, m), 3.60 (2H, m), 4.96 (1H, m), 6.49 (1H, d, J= 15.8 Hz), 7.60 (1H, d, J= 15.8 Hz), 7.66 (1H, d, J=
8.0 Hz), 7.82 (1H, s) (1H, d, J= 8.0 Hz).
Example 70 Preparation of 3-(2-Hexy1-1-pyrrolidin-3-y1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (80) [0316] The titled compound (80) was prepared according to the procedures described in Example 68, by using appropriate starting materials. HPLC purity: 98%; LCMS
m/z:
357 ([M + H]+). 1H NMR (CD30D) 8 0.84 (3H, t, J = 7.2 Hz), 1.22-1.38 (4H, m), 1.44 (2H, m), 1.81 (2H, m), 2.52-2.82 (2H, m), 3.10-3.17 (2H, m), 3.48 (1H, m), 3.80 (2H, m), 5.56 (1H, m), 6.48 (1H, d, J= 15.8 Hz), 7.56 (1H, d, J = 15.8 Hz), 7.65 (1H, d, J=
9.2 Hz), 7.84 (1H, s), 7.90 (1H, d, J= 9.2 Hz).
Example 71 Preparation of 342-Buty1-1-(1-methyl-pyrrolidin-3-y1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide (81) [0317] The titled compound (81) was prepared according to the procedures described in Example 68, by using 69-4 via reductive amination to introduce a methyl group.
HPLC purity: 98%; LCMS m/z: 343 ([M + H]). 1H NMR (CD300) 6 0.99 (3H, t, J =
7.2 Hz), 1.52 (2H, m), 1.83 (2H, m), 2.65-2.92 (2H, m), 3.09 (3H, s), 3.15-3.25 (2H, m), 3.58 (1H, br.), 3.90 (2H, m), 5.73 (1H, m), 6.51 (1H, d, J = 16.0 Hz), 7.58 (1H, d, J =
16.0 Hz), 7.69 (1H, d, J= 8.0 Hz), 7.88 (1H, s), 8.00 (1H, d, J= 9.2 Hz).
Example 72 Preparation of 3-(2-Hexy1-1-piperidin-3-y1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (82) [0318] The titled compound (82) was prepared according to the procedures described in Example 68, by using appropriate starting materials. HPLC purity: 97%; LCMS
m/z:
343 ([M + Hr). 1H NMR (CD30D) 6 0.99 (3H, t, J= 7.2 Hz), 1.52 (2H, m), 1.84 (2H, m), 2.04 (1H, m), 2.20 (2H, m), 2.61 (1H, m), 3.12-3.22 (2H, m), 3.49 (1H, m), 3.67 (1H, m), 3.78 (1H, t, J = 12.0 Hz), 4.98 (1H, m), 6.53 (1H, d, J = 15.8 Hz), 7.63 (1H, d, J =
15.8 Hz), 7.70 (1H, d, J = 9.2 Hz), 7.86 (1H, s), 8.06 (1H, d, J = 8.8 Hz).
Example 73 Preparation of 3-(2-Butyl-1-piperidin-3-y1-1H-benzoimidazol-5-0)-N-hydroxy-acrylamide (83) [0319] The titled compound (83) was prepared according to the procedures described in Example 68, by using appropriate starting materials. HPLC purity: 97%; LCMS
m/z:
371 ([M + H]). 1H NMR (CD30D) 8 0.88 (3H, t, J = 7.2 Hz), 1.22-1.42 (4H, m), 1.47 (2H, m), 1.84 (211, m), 2.04 (1H, m), 2.20 (2H, m), 2.62 (1H, m), 3.12-3.22 (2H, m), 3.48(111, m), 3.68 (1H, m), 3.78 (1H, t, J = 12.0 Hz), 5.01 (1H, m), 6.53 (1H, d, J= 15.8 Hz), 7.62 (1H, d, J = 15.8 Hz), 7.70 (1H, d, J = 9.2 Hz), 7.86 (111, s), 8.06 (1H, d, J =
8.8 Hz).
Example 74 Preparation of (E)-N-hydroxy-3-(1-(1-methylpiperidin-3-y1)-2-penty1-1H-benzo[d]imidazol-5-yOacrylamide (86) [0320] The titled compound (86) was prepared according to the procedures described in Example 71, by using appropriate starting materials.HPLC purity: 99.3 %, tR
=1.06 min; LCMS m/z: 371 ([M + H]). 1H NMR (CD30D) 8 8.18 (d, J = 7.9 Hz, 1H), 7.92 (s, 1H), 7.77 (d, J = 8.1 Hz, 1H), 7.61 (d, J = 15.7 Hz, 1H), 6.58 (d, J = 15.7 Hz, 1H), 5.21 (brs, 1H), 3.69 (brs, 2H), 3.69 ¨ 3.66 (m, 1H), 3.37 ¨ 3.27 (masked peaks), 3.03 (s, 3H), 2.66 (brs, 1H), 2.29 ¨ 2.22 (m, 3H), 1.94¨ 1.90 (m, 2H), 1.54 ¨ 0.94 (m, 4H), 0.96 (t, J = 7.1 Hz, 3H); 13C NMR (CD30D) 8165.6, 157.6, 139.9, 134.6, 134.1, 132.5, 126.3, 120.4, 115.5, 115.2, 54.9, 54.4, 53.3, 44.1, 32.4, 27.5, 27.3, 26.8, 23.2, 23.1, 14.2.
Example 75 Preparation of (E)-3-(2-hexy1-1-(1-(2-hydroxyethyl)piperidin-3-y1)-1H-benzo[d]imidazol-5-y1)-N-hydroxyacrylamide (90) [0321] The titled compound (90) was prepared according to the procedures described in Example 68, by using appropriate starting materials and alkylation of the piperidine with 2-bromoethanol. LCMS m/z: 415 ([M +H]).

Example 76 Preparation of N-Hydroxy-3-[1-(1-pentyl-piperidin-3-y1)-1H-benzoimidazol-5-y1]-acrylamide (94) [0322] The titled compound (94) was prepared according to the procedures described in Example 68, by using appropriate starting materials (formic acid for benzimdiazoel ring formation and reductive amination of the piperidine with pentanal). HPLC
purity:
95%; LC-MS rn/z: 357 ([M+H]). 1H NMR (CD30D) 8 9.04 (s, 1H), 7.94 (brs, 2H), 7.78 (d, 1H, J=8.2 Hz), 7.70 (d, 1H, J= 15.7 Hz), 6.57 (d, 1H, J= 15.9 Hz), 5.14 ¨
5.10 (m, 1H), 3.85(dd, 2H, J = 88.0, 9.0 Hz), 3.48 ¨ 3.13 (m, 4H), 2.43 ¨ 2.12 (m, 4H), 1.94 ¨10 1.80 (m, 2H), 1.39 ¨ 1.29 (m, 4H), 0.94 (t, 3H, J= 6.8 Hz).
Example 77 Preparation of N-Hydroxy-3-[1-(1-phenethyl-piperidin-3-y1)-1H-benzoimidazol-5-y1]-acrylamide (96) [0323] The titled compound (96) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 98.6%; LC-MS
rn/z: 391([M+H]). 1H NMR (CD30D) 6 8.93 (s, 1H), 7.95 (s, 1H), 7.91 (d, 1H, J
= 8.5 Hz), 7.76 (d, 1H, J = 8.5 Hz), 7.70 (d, 1H, J = 15.8 Hz), 7.35 ¨ 7.24 (m, 6H), 6.56 (d, 1H, J = 15.7 Hz), 5.10 (t, 1H, J = 11.4 Hz), 3.91 (dd, 2H), 3.55 ¨ 3.45 (m, 2H), 3.15 -3.11 (m, 2H), 2.46 ¨ 2.13 (m, 6H).
Example 78 Preparation of N-Hydroxy-3-{141-(3-phenyl-propyl)-piperidin-3-y1]-benzoimidazol-5-y1}-acrylamide (97) [0324] The titled compound (97) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 94.5%; LC-MS:
405 ([M+Hr) 1H NMR (CD30D) 8 8.68 (s, 1H), 7.94 (s, 1H), 7.80 (d, 1H, J = 8.4 Hz), 7.71 (d, 1H, J= 15.7 Hz), 7.69 (d, 1H, J= 8.2 Hz), 7.31 ¨7.17 (m, 6H), 6.54(d, 1H, J=
15.6 Hz), 3.71 (dd, 2H, J= 66 Hz, 10.9 Hz), 3.48 ¨ 3.40 (m, 1H), 3.13 ¨ 3.05 (m, 2H), 2.73 (t, 2H, J= 7.4 Hz), 2.38 ¨ 2.04 (m, 8H);
. Example 79 Preparation of 3-(141-(3,3-Dimethyl-butyl)-pyrrolidin-3-y1]-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide (99) [0325] The titled compound (99) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 91.9%; tR
= 1.10 min. LC-MS rn/z: 357 ([MH]+). 1H NMR (DMSO-d6) 6 0.91 (9H, s), 1.52 (4H, m), 3.09 (1H, m), 3.29 (6H, m), 6.52 (1H, d), 7.43 (2H, m), 7.62 (1H, m), 7.80 (1H, m), 8.82 (1H, s), 10.25 (1H, bs).
Example 80 Preparation of 3-{142-(Ethyl-methyl-amino)-ethy1]-2-penty1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (79) [0326] The titled compound (79) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity: 99%; tR =
0.68 min.
LC-MS m/z: 359 ([M+H]). 1H NMR (DMSO-d6) 60.89 (3H, m), 1.23 (3H, m), 1.38 (4H, m), 1.84 (2H, m), 2.92 (3H, s), 3.10 (2H, m), 3.28 (2H, m), 3.52 (2H, m), 4.77 (2H, m), 6.58 (1H, d), 7.61 (1H, d), 7.71 (1H, m), 7.92 (2H, m), 10.48 (1H, bs).
Example 81 Preparation of 3-{2-Buty1-142-(ethyl-methyl-amino)-ethy1]-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide (85) [0327] The titled compound (85) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity: 95.8%; tR
=1.04 min. LC-MS m/z: 345 ([M+H]). 1H NMR (DMSO-d6) 8 0.95 (3H, m), 1.25 (3H, m), 1.46 (2H, m), 1.81 (2H, m), 2.92 (3H, s), 3.13 (2H, m), 3.27 (2H, m), 3.54 (2H, m), 4.80 (2H, m), 6.60 (1H, d), 7.62 (1H, d), 7.75 (1H, m), 7.92 (2H, m), 10.59 (1H, bs).
Example 82 Preparation of 3-(2-Buty1-1-{2-[ethyl-(3-hydroxy-propy1)-amino]-ethyl}-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (91) [0328] The titled compound (91) was prepared according to the procedures described =
in Example 1, by using appropriate starting materials. HPLC purity: 93.5%; tR=
0.50 min. LC-MS (m/z): 389 ([MH]-). 1F1 NMR (DMSO-d6) 8 0.94 (3H, m), 1.25 (311, m), 1.46 (2H, m), 1.83 (4H, m), 3.04 (2H, m), 3.31 (4H, m), 3.50 (4H, m), 4.72 (2H, m), 6.54 (1H, d), 7.61 (1H, m), 7.69 (1H, m), 7.80 (1H, m), 7.90 (1H, m), 10.20 (1H, bs).
Example 83 Preparation of 3-(1-{2-[Ethyl-(3-hydroxy-propy1)-amino]-ethyl}-2-pentyl-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (92) [0329] The titled compound (92) was prepared according to the procedures described in Example 1, by using appropriate starting materials. HPLC purity: 93.5%; tR
= 0.50 min. LC-MS (m/z): 389 ([M+H]4) 1H NMR (DMSO-d6) 60.94 (3H, m), 1.25 (3H, m), 1.46 (2H, m), 1.83 (4H, m), 3.04 (2H, m), 3.31 (4H, m), 3.50 (4H, m), 4.72 (2H, m), 6.54 (1H, d), 7.61 (1H, m), 7.69 (1H, m), 7.80 (1H, m), 7.90 (1H, m), 10.20 (1H, bs).
Example 84 Preparation of 3-{142-(Butyl-ethyl-amino)-ethy1]-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide (95) [0330] The titled compound (95) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 99.9%; LC-MS
miz: 331([M+H]). 1H NMR (CD30D) 8 9.29 (s, 1H), 7.99 ¨ 7.95 (m, 2H), 7.82 (d, 1H, J
= 8.5 Hz), 7.56 (d, 1H, J = 15.6 Hz), 6.53 (d, 1H, J = 15.5 Hz), 5.0 ¨ 4.95 (m, 2H), 3.86 ¨ 3.78 (m, 2H), 3.42 (dd, 2H, J = 13.3, 7.1 Hz), 3.28 ¨ 3.26 (m, 2H), 1.74 ¨
1.71 (m, 2H), 1.43 (qt, 2H, J = 7.4, 3.8 Hz), 1.38 (t, 3H, J = 7.2 Hz), 1.00 (t, 3H, J
= 7.3 Hz).
Example 85 Preparation of 3-[2-(4-Cyano-butyl)-1-(2-diethylamino-ethyl)-1H-benzoimidazol-yli-N-hydroxy-acrylamide (101) [0331] The titled compound (101) was prepared according to the procedures described in Example 57, by using appropriate starting materials. HPLC purity at 254 nm:
99.9%.
LC-MS (ESI) m/z: 384 ([M+H]). 1H NMR (CD300) 6 7.78 (1H, s) 7.76 (1H, d, J =
8.5 Hz), 7.63 (1H, d, J = 16.9 Hz), 7.58 (1H, d. J = 5.1 Hz), 6.44 (1H, d, J =
15.3 Hz), 4.70 (2H, in water peak), 3.50 (2H, t, J = 7.6 Hz), 3.32 (4H, qt, J = 7.3 Hz), 3.07 (2H, t, J =
8.0 Hz), 2.50 (2H, t, J = 7.0 Hz), 1.99 (2H, q, J = 7.5 Hz), 1.78 (2H, q, J =
7.3 Hz), 1.29 (6H, t, J = 7.3 Hz).
Example 86 Preparation of 3-{142-(Butyl-isopropyl-amino)-ethyl]-1H-benzoimidazol-5-y1}-19-hydroxy-acrylamide (108) [0332] The titled compound (108) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 98.8%; tR
= 1.33 min. LC-MS mk: 345 ([M+Hr). 1H NMR (DMSO-d6) 8 0.90 (3H, m), 1.25 (6H, d), 1.35 (2H, m), 1.64 (2H, m), 3.09 (2H, m), 3.51 (1H, m), 3.73 (2H, m), 4.74 (2H, m), 6.52 (1H, d), 7.53 (2H, m), 7.64 (1H, m), 7.80 (1H, m), 8.62 (1H, m), 9.40 (1H, bs), 10.72 (1H, bs).

Example 87 Preparation of N-Hydroxy-3-{142-(isopropyl-pentyl-amino)-ethyl]-benzoimidazol-5-y1}-acrylamide (109) [0333] The titled compound (109) was prepared according to the procedures described in Example 76, by using appropriate starting materials. LC-MS m/z: 359 ([M+H]). 1H
NMR (DMSO-d6) 8 0.88 (3H, t), 1.25 (10H, m), 1.64 (2H, m), 3.12 (2H, m), 3.51 (1H, b), 3.60 (1H, b), 3.73 (1H, b), 4.74 (2H, t), 6.51 (1H, d), 7.59 (1H, s), 7.63 (1H, d), 7.80 (1H, d), 7.93 (1H, s), 8.65 (1H, s), 9.46 (1H, b) Example 88 Preparation of 342-(5-Cyano-penty1)-1-(2-diethylamino-ethyl)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (110) [0334] The titled compound (110) was prepared according to the procedures described in Example 57, by using appropriate starting materials. HPLC purity at 254 nm:
95.4%.
LC-MS (ESI) m/z: 347 ([M+H]). 1H NMR (CD30D) 8 7.96 (1H, d, J = 8.5 Hz), 7.90(1H, s) 7.81 (1H, d, J = 8.5 Hz), 7.59 (1H, d. J = 15.6 Hz), 6.55 (1H, d, J = 15.5 Hz), 4.96 (2H, t, J = 7.3 Hz), 3.69 (2H, t, J = 7.1 Hz), 3.44 (4H, qt, J = 7.2 Hz), 3.31 (2H, embedded in Me0D peak), 2.51 (2H, t, J = 6.9Hz), 2.05-1.98 (2H, m), 1.78 (2H, m, J =
7.4 Hz), 1.70 (2H, m, J = 6.4 Hz), 1.41(3H, t, J = 7.2 Hz);
Example 89 Preparation of 3-(1-{2-[(3,3-Dimethyl-butyl)-ethyl-amino]-ethyl}-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (111) [0335] The titled compound (111) was prepared according to the procedures described in Example 76, by using appropriate starting materials. TFA salt. HPLC purity:
97.7%;
LC-MS m/z: 359 ([M+H]). 1H NMR (CD30D) 8 9.10 (s, 1H), 7.89 (d, 1H, J = 8.9 Hz), 7.88 (s, 1H), 7.74 (d, 1H, J = 8.6 Hz), 7.51 (d, 1H, J = 15.7 Hz), 6.46 (d, 1H, J = 15.7 Hz), 4.98 ¨ 4.93 (m, 2H), 3.77 ¨ 3.75 (m, 2H), 3.38 (dd, 2H, J = 13.3, 7.2 Hz), 3.22 ¨
3.18 (m, 2H), 1.60 ¨ 1.59 (m, 2H), 1.33 (t, 3H, J = 7.1 Hz), 0.91 (s, 9H);
[0336] HCI salt. 1H NMR (DMSO-d6) 8 9.90 (bs, 1H), 8.65 (s, 1H), 7.93 (s, 1H), 7.82 (d, . 1H, J = 8.5 Hz), 7.64 (d, 1H, J = 8.1 Hz), 7.61 (d, 1H, J = 15.6 Hz), 7.52 (d, 1H, J =
15.8 Hz), 4.76 ¨ 4.72 (t, 2H, J = 7.0), 3.65 ¨ 3.60 (m, 2H), 3.32 ¨ 3.24 (m, 2H), 3.17 ¨
3.08 (m, 2H), 1.52¨ 1.47 (m, 2H), 1.22 (t, 3H, J = 7.2 Hz), 0.87 (s, 9Hz).

Example 90 Preparation of 3-{1-12-(Ethyl-propyl-amino)-ethyl]-1H-benzoimidazo1-5-y1)-N-hydroxy-acrylamide (112) [0337] The titled compound (112) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 98.1%; LC-MS
m/z: 315 ([M+H]). 1H NMR (CD30D) 8 9.43 (s, 1H), 7.99 (d, 1H, J= 8.5 Hz), 7.93 (s, 1H), 7.82 (d, 1H, J= 8.5 Hz), 7.53 (d, 1H, J= 15.7 Hz), 6.50 (d, 1H, J= 15.5 Hz), 5.00 ¨ 4.96 (m, 2H), 3.78 (t, 2H, J= 6.1 Hz), 3.37 (dd, 2H, J= 14.2, 7.2 Hz), 3.22 ¨ 3.19 (m, 2H), 1.75 (qt, 2H, J= 7.5 Hz), 1.33 (t, 3H, J= 7.2 Hz), 0.99 (t, 3H, J= 7.3 Hz).
Example 91 Preparation of N-Hydroxy-3-(1-{2-[isopropyl-(2-methyl-penty1)-amino]-ethyl}-1H-benzoimidazol-5-y1)-acrylamide (113) [0338] The titled compound (113) was prepared according to the procedures described in Example 76, by using appropriate starting materials. LC-MS m/z: 373RM+H)1].

NMR (DMSO-d6) 8 0.86 ¨ 0.97 (7H, m), 1.14 ¨1.28 (12H, m), 4.70 (2H, b), 6.49 (1H, d), 7.58 ¨7.62 (2H, m), 7.73 (1H, d), 7.91 (1H, s), 8.48 (1H, s) Example 92 Preparation of 3-{142-(Ethyl-hexyl-amino)-ethyl]-2-methyl-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide (116) [0339] The titled compound (116) was prepared according to the procedures described in Example 57, by using appropriate starting materials. HPLC purity at 254 nm:
98.2%, tR = 1.27 min. LC-MS (ESI) m/z: 373 ([M+Hr). 1H NMR (CD30D) 8 7.85 (1H, s), 7.78 (1H, d, J= 8.4 Hz), 7.70 (1H, d, J= 8.7 Hz), 7.15 (1H, d. J= 15.9 Hz), 6.53 (1H, d, J=
15.9 Hz), 4.81 (2H), 3.63 (2H, t, J = 7.7 Hz), 3.41 (2H, qt, J= 7.2 Hz), 3.29 (2H), 2.82 (3H, s), 1.74 (2H, m), 1.37 (11H, m), 0.93 (3H, t, J = 6.9 Hz).
Example 93 Preparation of 3-(1-[2-(Butyl-ethyl-am i no)-ethyl]-2-trifluoromethy1-1H-benzoi midazol-5-y1)-N-hydroxy-acrylamide (117) [0340] The titled compound (117) was prepared according to the procedures described in Example 57, by using appropriate starting materials. HPLC purity at 254 nm:
97.3%, tR = 1.50 min. LC-MS (ESI) m/z: 399 (1M+Hr). 1H NMR (CD30D) 8 7.95 (1H, s), 7.70 (2H, s), 7.62 (1H, d, J= 15.9 Hz), 6.46 (1H, d, J= 15.8 Hz), 5.24 (2H), 3.50 (2H, t, J=
8.8 Hz), 3.31 (2H, qt, J= 7.2 Hz), 3.17 (2H), 1.63 (2H, m), 1.35 (2H, qt, J =
7.5 Hz), 1.29 (3H, t, J = 7.2 Hz), 0.92 (3H, t, J = 7.4 Hz).

Example 94 Preparation of 3-{142-(Ethyl-hexyl-amino)-ethyl]-2-trifluoromethy1-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (118) [0341] The titled compound (118) was prepared according to the procedures described in Example 57, by using appropriate starting materials. HPLC purity at 254 nm:
94.6%, tR = 2.07 min. LC-MS (ESI) m/z: 427 ([M+111+). 1H NMR (CD30D) 8 8.04 (1H, s), 7.80 (2H, s), 7.72 (1H, d, J = 15.8 Hz), 6.56 (1H, d, J = 15.6 Hz), 4.85 (2H), 3.61 (2H, t, J =
8.5 Hz), 3.42 (2H, qt, J = 7.2 Hz), 3.26 (2H), 1.75 (2H, m), 1.39 (9H, m, J =
7.5 Hz), 0.93 (3H, t, J = 7.0 Hz).
Example 95 Preparation of 341-(2-Dipropylamino-ethyl)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide (120) [0342] The titled compound (120) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 100%. LC-MS
m/z: 331 ([M+H]). 1H NMR (DMSO-d6) 8 0.86 (6H, d), 1.64 (4H, m), 3.09 (4H, m), 3.60 (2H, m), 4.76 (2H, m), 6.53 (1H, d), 7.55 (2H, m), 7.65 (1H, m), 7.88 (1H, m), 8.75 (1H, m), 9.93 (1H, bs).
Example 96 Preparation of N-Hydroxy-3-(1-{24isopropyl-(3-methyl-butyl)-aminoFethyl}-1H-benzoimidazol-5-y1)-acrylamide (121) [0343] The titled compound (121) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 98.7%; tR
= 1.02 min. LC-MS (m/z): 358 ([M+H]). 1H NMR (DMSO-d6) 8 0.88 (6H, d), 1.28 (6H, m), 1.59 (3H, m), 3.10 (3H, m), 3.68 (2H, m), 4.71 (2H, m), 6.50 (1H, d), 7.50 (2H, m), 7.59 (1H, m), 7.63 (1H, m), 8.52 (1H, m), 9.50 (1H, bs), 10.70 (11-1, bs).
Example 97 Preparation of 3-(1-{2-[(3,3-Dimethyl-butyl)-methyl-aminoFethyl}-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (122) [0344] The titled compound (122) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity at 254 nm:
97.8%;
tR = 0.93 min. LC-MS m/z: 345 ([M+H]). 1H NMR (DMSO-d6) 8 0.84 (9H, s), 1.52 (2H, m), 2.90 (3H, s), 3.17 (2H, m), 3.68 (2H, m), 4.80 (2H, m), 6.58 (1H, d), 7.59 (2H, m), 7.86 (1H, m), 7.90 (1H, m), 8.82 (1H, m), 10.10 (1H, bs).

Example 98 Preparation of 3-(1-{2-[(2-Ethyl-buty1)-methyl-amino]-ethy1}-1H-benzoimidazol-y1)-N-hydroxy-acrylamide (123) [0345] The titled compound (123) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity at 254 nm:
97.7%;
tR= 0.87 min. LC-MS m/z: 345 ([M+H]). 1H NMR (DMSO-d6) 5 0.81 (6H, m), 1.29 (4H, m), 1.69 (1H, m), 2.89 (3H, s), 3.08 (2H, m), 3.59 (2H, m), 4.77 (2H, m), 6.53 (1H, d), 7.52 (2H, m), 7.86 (1H, m), 7.94 (1H;rn), 8.80 (1H, m), 9.54 (1H, bs).
Example 99 Preparation of 3-{142-(3,3-Dimethyl-butylamino)-ethy1]-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide (126) [0346] The titled compound (126) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 100%; tR
= 1.01 min. LC-MS m/z: 331 ([M-I+11+). 1H NMR (DMSO-d6) 8 0.88 (9H, s), 1.44 (2H, m), 2.92 (2H, m), 3.50 (2H, m), 4.66 (2H, m), 6.54 (1H, d), 7.58 (2H, m), 7.82 (1H, m), 7.90 (1H, m), 8.74 (1H, m).
Example 100 Preparation of N-Hydroxy-3-{1-12-(methyl-pent-4-enyl-amino)-ethy1]-1H-benzoimidazol-5-y1}-acrylamide (127) [0347] The titled compound (127) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 100%; tR
= 0.92 min. LC-MS m/z: 329 ([M+H]+). 1H NMR (DMSO-d6) 8 1.17 (2H, m), 2.06 (2H, m), 2.90 (3H, s), 3.10 (2H, m), 3.65 (2H, m), 4.80 (2H, m), 5.03 (2H, m), 5.75 (11-1, m), 6.57 (1H, d), 7.60 (1H, d), 7.69 (1H, m), 7.90 (1H, m), 7.97 (1H, m), 8.92 (1H, m), 10.29 (1H, bs).
Example 101 Preparation of 3-(1-{2-[(3,3-Dimethyl-buty1)-propyl-aminoFethyl}-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (128) [0348] The titled compound (128) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 99.0%;
tR=1.18 min. LC-MS m/z: 373 ([M-I-Hr). 1H NMR (DMSO-d6) 60.88 (12H, m), 1.51 (2H, m), 1.64 (2H, m), 3.10 (4H, m), 3.63 (2H, m), 4.76 (2H, m), 6.54 (1H, d), 7.65 (2H, m), 7.80 (1H, m), 7.94 (1H, m), 8.83 (1H, m), 9.93 (1H, bs).

Example 102 Preparation of 3-{142-(3,3-Dimethyl-butylamino)-ethy1]-2-propy1-benzoimidazol-5-y1)-N-hydroxy-acrylamide (130) [0349] Step 1: Cyclization OMe OMe ______________________________________ - ______ N
HN
Zn, Me0H/AcOH

50 C

[0350] To the starting material (111a2, 3.34 g, 12.6 mmol) in 20% AcOH in Me0H
(33 mL, 0.2 M) was added butyraldehyde (1.7 mL, 18.9 mmol) followed by zinc powder =
(4.12 g, 63 mmol). The resulting mixture was heat up to 50 C and stirred at this temperature for 30 minutes. The completion of reaction was monitored by HPLC
and LCMS. The solvent was then evaporated to dryness and the crude was dissolved with ethyl acetate, subsequently saturated aqueous sodium carbonate was added till pH = 9 and the mixture was centrifuged spin at 9000 rpm for 10 min. The liquid was decanted and solid was rinsed with ethyl acetate (sonicated). The liquid was extracted with ethyl acetate and then purifed by flash chromatography (silica, 3% Me0H in DCM) to give 3-[1-(2-Amino-ethyl)-2-propyl-1H-benzoimidazol-5-A-acrylic acid methyl ester.
Yield = 25 c/o, LC-MS m/z: 288 ([M+H]).
[0351] Step 2: Reductive-amination 0 </N so ___________________________________________________ OMe ;4 OMe / (14 NaCNBH3, AcOH/ Me0H ,y¨NH

[0352] To 341-(2-Amino-ethyl)-2-propy1-1H-benzoimidazol-5-y1]-acrylic acid methyl ester (1.2 g, 4.2 mmol) in Me0H (40 mL) was added 3,3-Dimethyl-butyraldehyde (0.524 mL, 4.2 mmol). The resulting mixture was stirred at it for 2 hours prior to the addition of acetic acid (2 mL) and sodium cyanoborohydride (0.395 g, 6.3 mmol) and the reaction was stirred at it for another 30 minutes. Solvent was removed and the residual was dissolved in DCM upon which was washed with aqueous sodium bicarbonate, water and brine. The combined organic layer, after workup, was purfied by flash chromatography (silica, 4% Me0H in DCM). LC-MS m/z: 372 ([M+H]).
[0353] Step 3: hydroxannic acid formation.
The titled compound (130) was prepared according to the procedures described in Example 1 (Step 4), by using appropriate starting materials.
TFA salt of 130: HPLC purity: 99.9%; LC-MS m/z: 373 ([M+H]). 1H NMR (CD30D) 8 7.89 (d, 1H, J = 8.6 Hz), 7.81 (s, 1H), 7.76 (d, 1H, J = 8.6 Hz), 7.44 (d, 1H, J = 15.7 Hz), 6.44 (d, 1H, J= 15.7 Hz), 4.81 (t, 2H, J = 7.0 Hz), 3.65 (t, 2H, J= 6.4 Hz), 3.23 ¨
3.19 (m, 2H), 3.16 ¨ 3.12 (m, 2H), 2.01 ¨1.94 (m, 2H), 1.65 ¨ 1.61 (m, 2H), 1.16 (t, 3H, 7.3 Hz), 0.96 (s, 9H).
HCI salt of 130: HPLC purity: 98.1 %; LC-MS m/z: 373 ([M+H]). 1H NMR (CD30D) 8.06 (d, 1H, J = 8.3 Hz), 7.90 (s, 1H), 7.88 (d, 1H, J = 8.4 Hz), 7.59 (d, 1H, J = 15.8 Hz), 6.56 (d, 1H, J= 15.8 Hz), 4.91 ¨ 4.81 (m, 2Hz), 3.60 ¨ 3.66 (m, 2H), 3.31 ¨ 3.35 (m, 2H), 3.17 ¨ 3.13 (m, 2H), 2.05¨ 1.97 (m, 2H), 1.70¨ 1.66 (m, 2H), 1.20 (t, 3H, J=
7.3 Hz), 0.98 (s, 9 H).
Example 103 Preparation of 34142-(3,3-Dimethyl-butylamino)-ethyl]-2-(2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (131) [0354] The titled compound (131) was prepared according to the procedures described in Example 102, by using appropriate starting materials. HPLC purity: 92%; LC-MS
m/z: 401([M+H]4). 1H NMR (CD30D) 8 7.89 (s, 1H), 7.85 (d, 1H, J= 8.5 Hz), 7.77 (d, 1H, J= 8.7 Hz), 7.63 (d, 1H, J= 15.8 Hz), 6.55 (d, 1H, J= 15.7 Hz), 4.91-4.81 (m, 2H), 3.58 (t, 2H, J = 6.5 Hz), 3.13-3.08 (m, 4H), 1.63-1.58 (m, 2H), 1.13 (s, 9H), 0.96 (s, 9H).
Example 104 Preparation of 341-{2-[Bis-(3,3-dimethyl-butyl)-amino]-ethyl}-2-(2,2-dimethyl-propy1)-1H-benzoimidazol-5-y1FN-hydroxy-acrylamide (132) [0355] The titled compound (132) was prepared according to the procedures described in Example 102, by using appropriate starting materials. HPLC purity: 96%; LC-MS
nn/z: 485([M+H]). 1H NMR (CD30D) 8 7.93 (s, 1H), 7.88 (d, 1H, J= 8.5 Hz), 7.80 (d, 1H, J=8.7 Hz), 7.72(d, 1H, J= 15.8 Hz), 6.59 (d, 1H, J= 15.8 Hz), 5.00 (t, 2H, J=6.5 Hz), 3.67 (t, 2H, J = 7.5 Hz), 3.13 ¨ 3.08 (m, 2H), 1.68 ¨ 1.64 (m, 4H), 1.14 (s, 9H), 0.96 (s, 18H).

Example 105 Preparation of 3-{142-(2,2-Dimethyl-propylamino)-ethy1]-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide (133) [0356] The titled compound (133) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 99.9%; LC-MS
m/z: 317([M+H]). 1H NMR (CD30D) 8 8.82 (s, 1H), 7.94 (s, 1H), 7.83 (d, 1H, J =
8.5 Hz), 7.75 (d, 1H, J = 8.7 Hz), 7.66 (d, 1H, J = 15.8 Hz), 6.53 (d, 1H, J =
15.8 Hz), 4.92 ¨ 4.78 (m, 2H), 3.64 (t, 2H, J = 7.0 Hz), 2.98 (s, 2H), 1.09 (s, 9H).
Example 106 Preparation of 3-(1-{2-[(2,2-D imethyl-propy1)-propyl-amino]-ethy1}-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide (134) [0357] The titled compound (134) was prepared according to the procedures described in Example 76, by using appropriate starting materials. HPLC purity: 99.9%;
LCMS
m/z: 359 ([M+H]). 1H NMR (CD30D) 8 9.07 (s, 1H), 7.95 (s, 1H), 7.92 (d, 1H, J
= 8.7 Hz), 7.78 (d, 1H, J= 8.4 Hz), 7.66 (d, 1H, J= 15.8 Hz), 6.56 (d, 1H, J= 15.8 Hz), 4.99 ¨ 4.97 (m, 2H), 3.74 (t, 2H = 7.0 Hz), 3.32 ¨ 3.20 (m, 4H), 1.85¨ 1.82 (m, 2H), 1.03 (s, 9H), 0.92 (t, 3H, J = 7.1 Hz).
Example 107 Preparation of 3-{142-(3,3-Dimethyl-butylamino)-ethy1]-2-ethyl-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide (135) [0358] The titled compound (135) was prepared according to the procedures described in Example 102, by using appropriate starting materials. HPLC purity: 94.3%;
LCMS
m/z: 359 ([M+H]). 1H NMR (CD30D) 6 7.69 (d, 1H, J = 8.0 Hz), 7.54 (s, 1H), 7.53 (d, 1H, J = 9.8 Hz), 6.89 (d, 1H, J = 16.1 Hz), 6.08 (d, 1H, J = 15.7 Hz), 4.80 ¨
4.70 (m, 2H), 3.55 ¨ 3.45 (m, 2H), 3.20 ¨ 3.19 (m, 2H), 2.95 ¨ 2.90 (m, 2H), 1.56¨ 1.52 (m, 2H), 1.42 (t, 3H, 7.4 Hz), 0.81 (s, 9H).
Example 108 Preparation of 341-(2-Diethylamino-ethyl)-2-propylamino-1H-benzoimidazol-5-y1)-, N-hydroxy-acrylamide (105) [0359] The titled compound (105) was made according to the following synthetic scheme.

F \rN
rjiN NE 1'W \ __ \ H2N
rHy = and h)r DCC \ N NH2OH N RN¨<'\ 14-OH
w HN-14 (00 riN
r'5 r"?
[0360] HPLC purity: 100%. 11-1-NMR (DMSO-d6) 8 0.97 (3H, t, J = 7.32 Hz), 1.22 (6H, m), 1.68 (2H, m), 3.09-3.60 (10H, m), 6.47 (1H, d, J = 15.80 Hz), 7.52-7.64 (4H, m), 9.03 (2H, bs), 10.10 (1H, s), 10.81 (1H, s) Example 109 Preparation of 341-(3-Dimethylamino-2,2-dimethyl-propy1)-2-propylamino-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide (115) [0361] The titled compound (115) was made by using method analogous to compound (105).HPLC purity: 97%.111-NMR (DMSO-d6) 8 0.97 (3H, t, J = 7.28), 1.15 (6H, s), 1.69 (2H, m, J = 7.28 Hz), 2.89 (6H, s), 3.28 (2H, s), 3.42 (2H, m), 4.15 (2H, s), 6.47 (2H, d, J = 15.80), 7.49-7.75 (4H, m), 8.94 (1H, bs), 9.42 (1H, bs), 10.81 (1H, bs), 13.44 (1H, bs).
[0362] The following compounds are representative examples prepared by methods disclosed or analogous to those disclosed in above Examples 1-109:
Cmpd rniz Structure NAME
No [M+H]
341-(3-Dimethylamino-( 2,2-dimethyl-propyI)-2-(2,2-dimethyl-propyI)-1H-benzoimidazol-5-/ yfl-N-hydroxy-=
acrylamide Cmpd m/z Structure NAME
No [M+H]
. 3-[1-(3-Dimethylamino-.4 '' 2,2-dimethyl-propy1)-2-N
359 isopropyl-1H-benzoimidazol-5-y1]-N-/ hydroxy-acrylamide , _ . 342-Buty1-1-(3-\_ r'. H dimethylamino-2,2-3 i 373 dimethyl-propy1)-1H-benzoimidazol-5-A-N-hydroxy-acrylamide _ 3-[1-(3-Dimethylamino-.
\ 2,2-dimethyl-propy1)-2-,,,OH
H
(2-methylsulfanyl-c ¨ ethyl)-1H-benzoimidazol-5-yli-N-I
hydroxy-acrylamide OH
3-[1-(3-Dimethylamino-40 ' . 2,2-dimethyl-propy1)-2-375 ethoxymethy1-1H-benzoimidazol-5-yl]-N-- hydroxy-acrylamide %
O 3-[1-(3-Dimethylamino-( =Ntc.....
2,2-dimethyl-propy1)-2-N

373 isobuty1-1H-benzoimidazol-5-y1]-N-%-- hydroxy-acrylamide , . .
3-[1 -(2-Diethylamino-( ethyl)-2-isobuty1-1H-359 benzoimidazol-5-A-N-rN) hydroxy-acrylamide Cmpd m/z Structure NAME
No [M+H]
-' 342-Buty1-1-(2-\ .`"
\ .
diethylamino-ethy1)-1H-N
359 benzoimidazol-5-y1]-N-ri r-N) hydroxy-acrylamide .
342-But-3-yny1-1-(3- -.õ dimethylamino-2,2-¨ \ 0 ' vi' 9 .
,..,\-----\\N ----/ 369 dimethyl-propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide . 342-But-3-eny1-1-(3-\ 10 ' g' dimethylamino-2,2-10 .
\----\,_.¨ 371 dimethyl-propy1)-1H-benzoimidazol-5-y11-N-/ hydroxy-acrylamide _ a µ
3-[2-But-3-eny1-1-(2-.- ,AH
\ 0 ri diethylamino-ethyl)-1H-.

357 benzoimidazol-5-yI]-N-hydroxy-acrylamide r-) _ 342-But-3-yny1-1-(2-¨ \ 0 ' n' diethylamino-ethyl)-1H-N

hydroxy-acrylamide 355 benzoimidazol-5-y1FN-r) OH 3-[1-(3-Dimethylamino-.
F I \ io . 2,2-dimethyl-propy1)-2-(3,3,3-trifluoro-propy1)-N

1H-benzoimidazol-5-y1]-N-hydroxy-/ acrylamide Cmpd m/z Structure NAME
No [WM+
/ H
HN 3-[1-(2-Diethylamino-' I \ 0 ethyl)-2-(3,3,3-trifluoro-14 N 399 propyI)-1H-benzoimidazol-5-A-N-hydroxy-acrylamide _ _ ,," 3-[1-(2-Diethylamino-.
\___._ io ethyl)-2-ethoxymethyl-.
15 N 361 1H-benzoimidazol-5-\--. yI]-N-hydroxy-acrylamide õõ"i 3-0 -(3-Dimethylamino-0 . 2,2-dimethyl-propyI)-2-331 methyl-1H-benzoimidazol-5-yli-N-hydroxy-acrylamide 3-[1-(2-Diethylamino-. )c < 0 NH
,c,õ ethyl)-2-(2,2-dimethyl-373 propy1)-1H-benzoimidazol-5-y1]-N-r) hydroxy-acrylamide . .
. (.,.
/ N-Hydroxy-3-[1-(3-isopropylamino-propyl)-NI 11 2-(3,3,3-trifluoro-F)cr'N\ propy1)-1H-benzoimidazol-5-y11-):-- acrylamide _ - 342-(2,2-Dimethyl-)( 0 Li propyI)-1-(2-isopropylannino-ethyl) N

, 3 1H-benzoirnidazol-5-/ NH y1]-11-hydroxy-acrylamide I

Cmpd . miz Structure NAME
No [M+H]
_ 3-[1-(2-.
40 r Diisopropylamino-ethyl)-2-(2,2-dimethyl-N
propyI)-1H-)n' benzoimidazol-5-y1]-N-, hydroxy-acrylamide . _ 3-[1-(2-( io 1: Diisopropylamino-N

387 ethyl)-2-isobuty1-1H-) benzoimidazol-5-y1]-N-n" hydroxy-acrylamide -_ O
3-[1-(3-Dimethylamino-2,2-dimethyl-propyI)-2-z NN io OH
399 hex-3-eny1-1H-.--- benzoimidazol-5-y1]-N-/ hydroxy-acrylamide 3-[1-(3-Dimethylamino-2,2-dimethyl-propy1)-2-429 (2,4,4-trimethyl-penty1)-i -- \----\_- 1H-benzoimidazol-5-/ yll-N-hydroxy-acrylamide O
_ 342-Cyclohexy1-1-(3-_ 399 dimethylamino-2,2-dimethyl-propyI)-1H-V-\-- benzoimidazol-5-yli-N-hydroxy-acrylamide 342-Bicyclo[2.2.1]hept-5-en-2-y1-1-(3-4, /N
"
. 0 1".
409 dimethylamino-2,2-\---\_.- dimethyl-propyI)-1H-/ benzoimidazol-5-y1]-N-hydroxy-acrylamide Cmpd m/z Structure NAME
No [WM+
3-[1-(2-Diethylamino-/ ''. 10 NE, ethyl)-2-hex-3-eny1-1H-26 ( 385 benzoimidazol-5-y1FN-hydroxy-acrylamide r.) _ .
. 341-(2-,,N, =' Ni:
<
/ Diisopropylamino-27 413 ethyl)-2-hex-3-eny1-1H-benzoimidazol-5-ylj-N-N)-- hydroxy-acrylamide . 342-Hex-3-eny1-1-(2-isopropylamino-ethyl)-/ <N S NH
1.

CH
N 371 1H-benzoimidazol-5-yli-N-hydroxy-acrylamide 342-Hex-3-eny1-1-(3-isopropylam ino-propy1)-29 / : SI .
1. 385 1H-benzoimidazol-5-( y1FN-hydroxy-H
acrylamide . . 3-[1-(2-Ethylamino-N
/ 110 ' NH
I
. 357 ethyl)-2-hex-3-eny1-1H-( Cvi benzoimidazol-5-y1FN-\,...- hydroxy-acrylamide _ .
7---- . 341-(2-Diethylamino-_ \ .
ti' ethyl)-2-hexy1-1H-.

387 benzoimidazol-5-y11-N-hydroxy-acrylamide ) . .

N-Hydroxy-341-(3-.
isopropylamino-propyI)-< 16"2-(2,4,4-trimethyl-pentyI)-1H-benzoimidazol-5-y1]-acrylamide 34242,2-Dimethyl-propyI)-143-isopropylamino-propy1)-1H-benzoimidazol-5-yI]-N-hydroxy-N
acrylamide _ Diisopropylamino-ethyl)-243,3,3-tritluoro-F F)4. 427 propy1)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide o N-Hydroxy-342-( r 35 isobutyl-142-345 isopropylamino-ethyl)-1H-benzoimidazol-5-yll-acrylamide o 3-[2-(2,2-Dimethyl-NH propyI)-1-(2-36 345 ethylamino-ethyl)-1H-benzoimidazol-5-y11-N-hydroxy-acrylamide 34142-Ethylamino-ethyl)-2-isobuty1-1H-37 331 benzoimidazol-5-y1J-N-.
hydroxy-acrylamide 3-[1-(2-. , Diisopropylamino-H
/ NN * IN ethyl)-2-(2,4,4-38 \ 443 trimethyl-penty1)-1H-N benzoimidazol-5-y1]-N-hydroxy-acrylamide N-Hydroxy-3-[1 -(2-isopropylamino-ethyl) \ 01 NH

/ N N
401 2-(2,4,4-trimethyl-C¨H
N \ _ r penty1)-1H-benzoimidazol-5-A-acrylamide 3-[1-(2-Ethylamino-N
ethyl)-2-(2,4,4-387 trimethyl-pentyI)-1H-CNH--, HNH/ benzoimidazol-5-y1]-N-hydroxy-acrylamide 3-[1-(2-Diethylamino-N
/
ethyl)-2-(2,4,4-41 .
415 trimethyl-penty1)-1 H-HN.õ
91 benzoimidazol-5-A-N-hydroxy-acrylamide , 3-[1-(2-Diethylamino-r'l ethyl)-2-propy1-1H-/-,¨/N 11 \ Nõõ benzoimidazol-5-y1]-N-7---N\
hydroxy-acrylamide ¨)N>¨ 3-12-Buty1-1-(2-43 \ 387 diisopropylamino-ethyl)-1H-/ \ < 0 0 benzoimidazol-5-A-N-NEI hydroxy-acrylamide ,,,, .-.-.-.
7----NI 342-Buty1-1-(2-ethylamino-ethyl)-1 H-44 / \ < 40 331 benzoimidazol-5-A-N-"" 0 hydroxy-acrylamide ..
_ , 3-[1-(2-Diethylamino-\ethyl)-2-(2-. B¨\ .1 0 ./ 11 H
N
methylsulfanyl-ethyl)-ri 377 1H-benzoimidazol-5-r) yll-N-hydroxy-acrylamide _ = 342-Buty1-1-(2-\ ,..
\ N 10 n isopropylamino-ethyl)-345 1H-benzoimidazol-5-3 yI]-N-hydroxy-/ NH acrylamide ...
3-[2-Buty1-1-(3-\ , ..., ..,,Ø
\ 0 H isopropylamino-propyI)-_.-- 359 1H-benzoimidazol-5-y1]-N-hydroxy-.
----c acrylamide . .
\ r 3-[1-(1-Benzyl-\ 10 ' N piperidin-4-y1)-2-butyl-6 433 1H-benzoimidazo1-5-y1]-N-hydroxy-Oacrylamide .
342-But-3-eny1-1-(2-/ <NN 0 C'" ethylamino-ethyl)-1H-49 // 329 benzoimidazol-5-yli-N-hydroxy-acrylamide i----_ \ . 342-Hexy1-1-(2-\
NH
111 isopropylamino-ethyl)-N
\_.,.. 373 1H-benzoimidazol-5-y1]-N-hydroxy-/ NH acrylamide . 3-[1-(2-Dimethylamino-ethyl)-2-(2,4,4-

51 )(¨( la NH
b. 387 N
trimethyl-penty1)-1H-rj benzoimidazo1-5-y1]-11----"\ hydroxy-acrylamide \ 0 341-(2-Ethylamino-\¨\ 0I. 359 ethyl)-2-hexy1-1H-

52 N benzoimidazol-5-yli-N-\ hydroxy-acrylamide N.,....-NH
N-Hydroxy-3-[1-(2-I- I 40 ,...
H isopropylamino-ethyl) \ 2-(3,3,3-trifluoro-

53 . 385 propyI)-1H-H N\ _ r benzoimidazol-5-y1]-acrylamide 3-[1-(2-Dimethylamino-

54 1õ
Iti fa ...., OH
/
1r 357 ethyl)-2-hex-3-eny1-1H-benzoimidazol-5-y1]-N-) hydroxy-acrylamide _--\
.
3-[1-(2-Amino-ethyl)-2-"40 ' 'OH (2,4,4-trimethyl-penty1)-

55 c< __ < 359 1H-benzoimidazol-5-y1]-11-hydroxy-acrylamide 3-[1-(2-Amino-ethyl)-2-<,"ti...,,OH
/
(2-methoxy-nonyI)-1H-

56 / N Willi 403 benzoimidazol-5-yli-N-, /
/ ,ip hydroxy-acrylamide ___________________________________________________________________ _ . 342-Buty1-1-(2-\
dimethylamino-ethyl)-

57 N
331 1H-benzoimidazol-5-y1FN-hydroxy-acrylamide ___________________________________________________________________ _ \ a 311-(2-Dimethylamino-\ .
N /
, ethyl)-2-hexy1-1H-

58 359 benzoimidazol-5-A-N-hydroxy-acrylamide _ __________________________________________________________________ N-{241 -(2-, ( . Diethylamino-ethyl)-5-HN \ ,0H
a (2-hydroxycarbamoyl-N

59 444 viny1)-1H-benzoimidazol-2-A-/ ethy1}-3,3-dimethyl-butyramide , _ 3-{1-(2-Diethylamino-Y. ethyl)-242-(2,2-\IT(OH

dimethyl-N
430 propionylamino)-ethyly \ 1H-benzoimidazol-5-õN\
/ yI}-N-hydroxy-acrylamide 3-{1-(2-Diethylamino-07,,_, s ethyl)-2-[(2,2-dimethyl-/ 0 ' L
H
N propionylamino)-methyl)-1H-r-N) benzoimidazol-5-y1}-N-hydroxy-acrylamide _ N-0-(2-Diethylamino-Ml N

i ethyl)-5-(2-OH hyd roxycarbamoyl-viny1)-1H-r) benzoimidazol-2-ylmethy1}-butyramide _ . 341-(2-ethylamino-___\\ \ _<7 0 NH
i" 359 ethyl) -2-(3,3-dimethyl-63 N buty1)-1H-\ benzoimidazol-5-y11-N-H hydroxy-acrylamide 3-[2-(3,3-Dimethyl-butyl)-1-(2-)F\ 40 10:1 Dimethylamino-ethyl) 1H-benzoimidazol-5-y1FN-hydroxy-,\
acrylamide 3-[1-(2-Dimethylamino-65 345 ethyl)-2-penty1-1H-.
..-0. benzoimidazol-5-y1FN---õ, \ hydroxy-acrylamide _ ' 3-[1-(2-Dimethylamino-F F
ethyl)-2-(2,212-trifluoro-ethyl)-1H-benzoimidazol-5-y1W-, ..
----N
\ hydroxy-acrylamide _ N-Hydroxy-3-[1-(5-methy1-1H-pyrazol-3-67 <N. SLi 396 yI)-2-(2,4,4-trimethyl-/c( penty1)-1H-7,11/ benzoimidazol-5-y11-acrylamide , 341 -(2-Ethylamino-,A.
F7 < 10 ti ethyl)-2-penty1-1H-345 benzoimidazol-5-y1]-N-hydroxy-acrylamide .) . 0 3-(2-Butyl-1 -pyrrolidin-0 \ (-ad 69 __---.<, 329 3-y1-1H-benzoimidazol-NH 5-yI)-N-hydroxy-acrylamide 0 3-(2-Butyl-1 -piperidin-70 __,, N 'S\ '-rcµH 343 4-y1-1H-benzoimidazol-5-yI)-N-hydroxy-IIN acrylamide . _ N-Hydroxy-3-[1-(2-/¨ 'Ic isopropylamino-ethyl) / 2-penty1-1H-benzoimidazol-5-y1]-, r acrylamide \ N-Hydroxy-3-[1-(2-\
= methylamino-ethyl)-2-.
72 . 385 non-3-eny1-1H-I.
N benzoimidazol-5-yli-rj acrylamide NH
/ N-Hydroxy-3-[1-(2-: 385 methylamino-ethyl)-2-non-6-eny1-1H-benzoimidazol-5-yll-acrylamide ri \ . 342-Hexy1-1-(2-N /CM

345 methylamino-ethyI)-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide --4,-, . N-Hydroxy-341 -(2-7 40 ' ' methylamino-ethyl)-2-75 / 331 penty1-1H-benzoimidazol-5-y1]-'IN\ acrylamide N-Hydroxy-3-[1-(2-0 Nr. methylamino-ethyl)-2-octy1-1H-benzoimidazol-5-y1]-\ HN \
acrylamide 3-[1-(2-Amino-ethy1)-2-_________________________ 40 r . octyl-1H-359 benzoimidazol-5-yli-N-H2N hydroxy-acrylamide \
3-12-Butyl-I-[2-N
40 ' ' , /--/ <c (isopropyl-methyl-/ 359 amino)-ethy1]-1H--N\ benzoimidazol-5-y1}-N-hydroxy-acrylamide 341424Ethyl-methyl--/ <
;,, 0 N- aminoyethy1]-2-pentyl-79 _/
359 1 H-benzoimidazol-5-y1}-N-hydroxy-r-N\ acry1amide .
.
342-(2-1-pyrrolidin-_ O.
; 6 357 . 3-y1-1 H-benzoimidazol-80 0, 5-yI)-N-hydroxy-acrylamide ' H

3-[2-Butyl-1-(1-methyl--tr , 40 O" pyrrolidin-3-yI)-1H-81 343 benzoimidazol-5-y1FN-:I> hydroxy-acrylamide N\ , .
.
342-Hexy1-1-piperidin-_ ,.,--'3"
a N 'IIIIV- H
371 3-y1-1 H-benzoimidazol-5-yI)-N-hydroxy-a acrylamide _ .
0 342-Butyl-I -piperidin-_ _,.0H
.....õ,õ...............õ......,.,<N -...... 0, 3-y1-1 H-benzoimidazol-83 N 343 5-yI)-N-hydroxy-acrylamide dil - _ _ 0 3-(1-{2-[Ethyl-(2-N
/ <
/ le '- NOH
H
/ N methoxy-ethyl)-amino]-ethy1}-2-penty1-1H-/
84 403 benzoimidazol-5-y1)-N-N hydroxy-acrylamide r co H
0 3-{2-Butyl-1I 424ethyl-N si ,,, N,OH
methyl-aminoyethyli-/ N I H-benzoimidazol-5-yI}-N-hydroxy-N
r \ acrylamide _________________________________________________________________ _ 0 N-Hydroxy-3-[1-(1-NõOH
methyl-piperidin-3-y1)-H
' N 2-penty1-1H-benzoimidazol-5-y11-a acrylamide . 0 - 3-{142-(Ethy)-hexyl-N
N -., N,OH
, H amino)-ethy1]-1H-benzoimidazol-5-A-N-87 359 hydroxy-acrylamide N
[if , _ 0 3-{142-(Ethyl-pentyl-N
N N_OH
H aminoyethy1]-1H-benzoimidazol-5-y1}-N-345 hydroxy-acrylamide N
j---1¨

-_ 0 3-{142-(Ethyl-heptyl-N

H arnino)-ethy1]-1 H-N
benzoimidazol-5-y1}-N-89 373 hydroxy-acrylamide N

\ 0 3-{2-Hexy1-141 -(2-\=hydroxy-ethyl)-N
\ =1 0 -,,, 1=61HH
piperidin-3-y1]-1H-90 415 benzoimidazol-5-yll-N-al . .
hydroxy-acrylamide ZOH

.126 0 3-(2-Butyl-1 42-[ethyl-(3-hydroxy-propy1)-OH amino]-ethyl}-1H-91 r----1 389 benzoimidazol-5-y1)-N-N \ hydroxy-acrylamide rff /
HO
_ -_ . 3-(142-[Ethyl-(3-- hydroxy-propy1)-/

403 amino]-ethyI}-2-pentyl-1H-benzoimidazol-5-yI)-N-hydroxy-acrylamide _ 0 1(0.
(E)-N-hydroxy-3-(1-(1---- c --,, phenethylpyrrolidin-3-yI)-1H-benzo[d]imidazol-5-ypacrylamide ill _ _ 0 (E)-N-hydroxy-3-(1-(1-_ N pentylpiperidin-3-yI)-1H-benzo[dlimidazol-5-N ypacrylamide -iii 0 34142-(Butyl-ethyl-N
amino)-ethyl]-1H-benzoimidazol-5-y1}-N-N hydroxy-acrylamide , -U
N opN,...AH
(E)-N-hydroxy-3-(1-(1-phenethylpiperidin-3-N
96 391 y1)-1 H-benzo[d]imidazol-5-N
ypacrylamide =0 .
(E)-N-hydroxy-3-(1-(1 -OH
(3-N phenylpropyl)piperidin-97 405 3-y1)-1 H-benzo[d]imidazol-5-N
41, yl)acrylamide ---õ, õAi, lei N (E)-N-hydroxy-3-(1-(1-(3---N 391 phenylpropyl)pyrrolidin-3-y1)-1 H-benzo[d]imidazol-5-ypacrylamide II _ 3-{141-(3,3-Dimethyl-N buty1)-pyrrolidin-3-y1F

3 357 1 H-benzoimidazol-5-N y1}-N-hydroxy-acrylamide OH (E)-3-(1-(2-(diethylamino)ethyl)-N

303 1 H-benzo[d]imidazol-5-y1)-N-N hydroxyacrylamide r) 3-[2-(4-Cyano-butyI)-1 N- \
(2-diethylamino-ethyl)-384 1H-benzoimidazol-5-y11-N-hydroxy-N
r acrylamide u la NH
111 (E)-3-(1-(1-N
butylpiperidin-3-yI)-1H-, benzo[d]imidazol-5-y1)-N-hydroxyacrylamide N

N

OH (E)-N-hydroxy-3-(1-(1-(pent-4-enyl)piperidin-N

di 355 3-yI)-1H-benzo[d]imidazol-5-\---\-- yl)acrylamide =-õ ,...., 0 ri OH (E)-3-(1-(1-(3,3-o 371 dimethylbutyl)piperidin-4-y1)-1H-N
benzo[d]imidazol-5-y1)------\ N-hydroxyacrylamide .
\
0 '4c" 3-[1-(2-Diethylamino-ethyl)-2-propylamino-N

360 1H-benzoimidazol-5-yll-N-hydroxy-r) acrylamide u ,l OH (E)-N-hydroxy-3-(1-(2-ei (isopropyl(propyl)amino N

331 )ethyl)-1H-benzo[d]imidazol-5-yl)acrylamide _ 0 N....AH
3-{142-(Butyl--.., ' N H isopropyl-amino)-ethyl]-108 345 1H-benzoimidazol-5-\-----N___ yI)-N-hydroxy-ff acrylamide ' OH N-Hydroxy-3-{1-(2-' 0 r, (isopropyl-pentyl-N , 359 amino)-ethy1]-1H-benzoimidazol-5-y1)-\ acrylamide _ \ 342-(5-Cyano-penty1)-.
\ 1-(2-diethylamino-110 \K 0 r 398 ethyl)-1H-ri benzoimidazol-5-yli-N-r) hydroxy-acrylamide _ 0 ......õ.0H 40 3- 1- 2- 3 3-Dimeth ( { R 1-, Y ' N butyl)-ethyl-amino]-359 ethyl)-1H-benzoimidazol-5-y1)-N-N\
--------r / hydroxy-acrylamide _ 0 N 110 3-{142-(Ethyl-propyl-N amino)-ethyl]-1H-benzoimidazo1-5-y1)-N-hydroxy-acrylamide N
-1--- ) OH
i 0 N
\ N-Hydroxy-3-(1-{2-N
, 373 [isopropyl-(2-methyl-113pentyl)-amino]-ethyl}-r-N 1H-benzoimidazol-5-y1)-acrylamide . (E)-N-hydroxy-3-(1-(2-i 40 Nc'H
\N (isopropy1(4,4,4-trifluorobutyl)amino)eth 114 ><1 \ \ (iN 399 y1)-1H-benzo[d]imidazol-5-)-- yl)acrylamide .
\3-[1-(3-Dimethylamino- , <i) 40 ...,, N,,, OH
2,2-dimethyl-propyI)-2-N

((_____. 374 propylamino-1H-benzoimidazol-5-y1]-N-hydroxy-acrylamide N-/ -U
2; -,...... NH.OH
N 3-{142-(Ethyl-hexyl-rj aminoyethy1]-2-methyl-1H-benzoimidazol-5-r 373 y1}-N-hydroxy-acrylamide U
F F le NH
1,H 3-{142-(Butyl-ethyl-FriN amino)-ethyl]-2-117399 trifluoromethy1-1H-r,N
/ benzoimidazol-5-y1}-N-hydroxy-acrylamide .
F 24 0 ,...., ,OH
F
Frici 3-{142-(Ethyl-hexyl-amino)-ethy1]-2-rN 427 trifluoromethy1-1H-benzoimidazol-5-y1}-N-hydroxy-acrylamide U
/ io -..., N...,,,ON
(E)-3-(1-(2-(dibutylamino)ethyl)-2-119 401 propy1-1H-) benzo[d]innidazol-5-y1)-_ N-hydroxyacrylamide - U r OH
N 0 N,/' 3-[1-(2-Dipropylamino-ethyl)-1H-331 benzoimidazol-5-A-N------\_¨N hydroxy-acrylamide . 0 N-Hydroxy-3-(1-{2-/ 40, rii....
[isopropyl-(3-methyl-359 butylyaminoj-ethyl)-1H-benzoimidazol-5-yl)-acrylamide _ 0 3-(1-{2-[(3,3-Dimethyl-<iN 401 rrAH buty1)-methyl-aminol-345 ethy11-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide _ 0 3-(1-{2-[(2-Ethyl-butyl)-methyl-amino]-ethyl}-123N 345 1H-benzoimidazol-5-yI)-N-hydroxy-acrylamide (E)-3-(1-(2-(bis(3,3-<, " 40 'c'l dimethylbutyl)amino)et 415 hyl)-1H-\/---\____. benzo[d]innidazol-5-y1)-VN-hydroxyacrylamide o (E)-3-(1-(2-40 Nc'H
(diisobutylamino)ethyl)-N

359 1H-benzo[d]imidazol-5-y1)-N-hydroxyacrylamide U
N N 40 Nõ,,,, 3-{1-[2-(3,3-Dimethyl-331 butylaminoyethy1]-1H-benzoimidazol-5-y1}-N-HN
hydroxy-acrylamide .
' Ni' N-Hydroxy-3-{142-N (methyl-pent-4-enyl-127 329 amino)-ethyI]-1H-,N
benzoimidazol-5-y1}-acrylamide 3-(1-{2-[(3,3-Dimethyl-ti butyI)-propyl-aminol-373 ethy1}-1H-benzoimidazol-5-y1)-N-hydroxy-acrylamide 3-0-(3-Dimethylamino-,, .."..,OH
\ lel Vi N 2,2-dimethyl-propyI)-2-129 363 methylsulfany1-1H-benzoimidazol-5-y1FN-N------- hydroxy-acrylamide 1 _ .
/ 7;\ lei N OH 3-{1-[2-(3,3-Dimethyl-N butylamino)-ethylj-2-373 propyl-1H-FIN benzoimidazol-5-y1}-N-hydroxy-acrylamide . 3-[1-[2-(3,3-Dimethyl-NriAilko, ....', ....AH
7( * butylaminoyethy1]-2-/ 401 (2,2-dimethyl-propyI)-1H-benzoimidazol-5-\---- yI]-N-hydroxy-acrylamide . 311-{2-[Bis-(3,3-N NAgib...
< * dimethyl-butyI)-amino]-/

Ni 485 ethy11-242,2-dimethyl-propy1)-1H-- benzoimidazol-5-y1FN-hydroxy-acrylamide u 2, 014 le ....., r 3-0 -[2(2,2-Dimethyl-N

317 propylamino)-ethy1]-1H-benzoimidazol-5-y1}-N-HN hydroxy-acrylamide 4 .
2, =,..., 14 ......õOH 341424(2,2-Dimethyl-N propyI)-propyl-amino]-359 ethy11-1H-benzoimidazol-5-y1)-N-4----N hydroxy-acrylamide . .F4 3-{14243,3-Dimethyl-/ -1 0 butylaminoyethy1]-2-N

359 ethy1-1H-benzoimidazol-5-y1}-N-ifNH
hydroxy-acrylamide _ BIOLOGICAL TESTING AND ENZYME ASSAYS
Recombinant GST-HDAC1 Protein expression and purification [0363] Human cDNA library was prepared using cultured SW620 cells.
Amplification of human HDAC1 coding region from this cDNA library was cloned separately into the baculovirus expression pDEST20 vector (GATEWAY Cloning Technology, Invitrogen Pte Ltd). The pDEST20-HDAC1 construct was confirmed by DNA sequencing.
Recombinant baculovirus was prepared using the Bac-To-Bac method following the manufacturer's instruction (lnvitrogen Pte Ltd). Baculovirus titer was determined by plaque assay to be about 108 PFU/ml.
[0364] Expression of GST-HDAC1 was done by infecting SF9 cells (Invitrogen Pte Ltd) with pDEST20-HDAC1 baculovirus at M01=1 for 48 h. Soluble cell lysate was incubated with pre-equilibrated Glutathione Sepharose 4B beads (Amersham) at 4 C
for 2 h. The beads were washed with PBS buffer for 3 times. The GST-HDAC1 protein was eluted by elution buffer containing 50 mM Tris, pH8.0, 150mM NaCI, 1%
Triton X-100 and 10mM or 20mM reduced Glutathione. The purified GST-HDAC1 protein was dialyzed with HDAC storage buffer containing 10mM Tris, pH7.5, 100mM NaC1 and 3mM MgC12. 20% Glycerol was added to purified GST-HDAC1 protein before storage at -80 C.
In vitro HDAC assay for determination of IC50 values [0365] The assay has been carried out in 96 well format and the BIOMOL
fluorescent-based HDAC activity assay has been applied. The reaction composed of assay buffer, containing 25 mM Tris pH 7.5, 137 mM NaCl, 2.7 mM KCI, 1 mM
MgCl2, 1 mg/ml BSA, tested compounds, an appropriate concentration of HDAC1 enzyme, 500 uM Flur de lys generic substrate for HDAC1 enzyme and subsequently was incubated at room temperature for 2 h. Flur de lys Developer was added and the reaction was incubated for 10 min. Briefly, deacetylation of the substrate sensitizes it to the developer, which then generates a fluorophore. The fluorophore is excited with 360 nm light and the emitted light (460 nm) is detected on a fluorometric plate reader (Tecan Ultra Microplate detection system, Tecan Group Ltd.).
[0366] The analytical software, Prism 3.0 (GraphPad Software Inc) has been used to generate IC50 from a series of data.
[0367] The HDAC enzyme inhibition results of representative compounds are shown in Table 1 (unit is micromolar).

[0368] Table 1. HDAC1 enzyme activity IC 50 (unit is micromolar).
Compound..,, No No Compound Compound No IC50 (invi) IC50 (uM) IC50 (PM) 1 0.042 46 0.049 - 91 ' 0.060 2 0.38 47 0.21 92 0.050 _ 3 0.15 48 0.43 93 - 0.23 4 0.12 49 0.11 94 0.064 0.17 50 0.036 95 0.052 _.
6 0.18 51 0.066 96 0.080 _ 7 0.091 52 0.025 97 0.10 8 0.052 53 0.10 98 0.32 _ 9 0.21 54 0.048 99 0.12 0.14 55 0.037 100 . 0.19 11 0.070 56 0.029 101 ' 0.08 12 0.064 57 0.090 102 0.54 13 0.42 58 0.030 103 0.10 .._ 14 '0.077 59 0.077 104 0.41 0.085 60 0.10 105 - 0.13 _ 17 0.13 61 0.070 107 0.074 19 0.064 62 - 0.054 108 - 0= .043 0.26 63 0.051 109 . 0.048 21 0.38 64 0.10 110 - 0= .044 22 0.064 65 0.078 111 0.029 _ _ 23 0.045 66 0.34 112 0.12 24 0.51 68 0.034 113 0.016 0.23 70 0.068 . 114 ' 0= .063 26 0.040 71 0.040 116 0.10 27 0.23 72 0.017 117 0.19 28 0.021 73 0.026 118 0.48 29 0.13 74 0.028 119 0.18 0.021 75 0.050 120 0.11 _ 31 0.045 76 0.018 121 0.079 32 - 0.060 77 0.026 122 0.037 33 0.23 78 0.044 123 0.027 34 0.88 79 0.040 124 0.085 _ 0.082 . 80 0.040 125 - 0.16 _ _ 36 0.096 81 0.12 126 0.042 37 0.091 82 = 0.10 127 0.078 = 38 0.56 83 0.19 128 0.031 39 0.024 84 0.063 129 0.77 40 0.027 85 0.11 130 = 0= .036 41 0.062 86 0.16 131 = 0= .066 42 0.15 - 8= 7 0.10 133 0.072 = 43 = 0.33 - 8= 8 0.047 134 0.22 ¨4-4 0.054 89 0.080 135 0.074 45 0.053 90 0.51 Cell-based proliferation assay for determination of G150 values [0369] Human colon cancer cell lines (Co10205, HCT116), Ovarian cancer cell line [0370] The cell activity results of representative compounds are shown in Table 2 and 3. The data indicated that the compounds of this invention are active in the [0371] Table 2. Cellular or Growth Inhibition Activity in Co1o205 cells (unit is micromolar) Compound Compound Compound G150 (I1M) GIN (IA) GI50 (0) No No No _ 1 0.50 46 0.48 - 91 2.40 _ .
2 2.12 47 3.6 92 1.82 _ .
3 2.22 48 0.78 93 2.14 _ . .
4 2.62 - 49 . 1.75 - 94 0.60 _ .
2.58 50 0.17 - 95 0.57 . .
6 , 2.69 51 0.26 '96 0.70 7 0.81 52 0.21 97 0.67 . .
8 0.56 53 1.05 - 99 1.89 9 - 1.87 - 54 0.46 '100 2.25 _.
1.77 55 0.91 '101 2.44 11 '0.48 56 0.90 102 ' 2.08 .
12 0.51 57 0.65 103 0.48 ' 13 - 5.5 58 0.38 ' 104 1.99 14 - 0.63 59 2.28 105 1.77 .
- 1.50 60 2.48 107 0.63 _ 17 - 1.19 ' 61 1.32 ' 108 0.44 _ 19 '0.53 62 2.60 109 0.49 '2.66 63 0.54 ' 110 1.74 _ 21 '2.51 64 0.73 111 0.21 _ 22 ' 0.75 65 0.56 112 0.88 _ 23 '0.19 66 8.8 113 0.61 _ 24 2.99 68 0.52 114 0.72 _ 2.38 70 7.0 116 0.70 26 '0.37 71 0.24 117 1.80 _ 27 '1.42 72 0.16 118 1.88 _ 28 0.18 73 0.23 119 0.77 _ 29 ' 1.92 74 0.55 120 0.49 _ 0.31 75 1.20 - 121 0.49 _ 31 0.42 76 0.29 122 0.15 _ 32 0.74 77 0.67 123 0.15 _ 33 2.11 78 0.54 - 124 0.54 _ _ 34 4.4 79 0.45 125 0.68 _ 35 0.66 80 1.37 126 0.42 _ 36 0.86 81 1.00 127 0.34 _ 37 1.09 82 1.23 128 0.14 _ 38 1.94 83 4.9 129 3.9 _ .
39 0.23 84 1.03 130 0.15 _ 40 0.16 85 1.52 -131 0.33 .
41 0.92 86 2.08 133 . 0.56 42 0.98 ' 87 ' 1.07 134 2.30 43 1.86 88 0.55 -135 0.26 _ 44 0.87 89 0.87 _ 45 0.54 90 8.1 [0372] Table 3. Cellular or Growth Inhibition Activity in Various Cancer Cell Lines Cell lines Compound' HCT116 A2780 PC3 HEP3B
1 ' ++ +++ +++ ++
7 + + ++ Not tested 8 ++ ++ +++ +
22 + +++ +++ Not tested 23 ++ +++ +++ Not tested 30 - ++ +++ +++ Not tested 40 +++ +44 +++ Not tested 44 + ++ +++ Not tested 46 +++ +++ +++ ++
50 +++ . +++ +++ Not tested 52 +++ +++ +++ Not tested 58 +++ +++ +++ +++
71 +++ +++ +++ Not tested - 111 Not tested Not testediNot tested +++
_ 130 +++ +++ +++ Not tested ("+++" for G150 < 0.5 M, "++" for G150 between 0.5 and 1.0 M," +" for GI50 between 1.0 JIM to 5.0 NI) Histone H3 acetylation assay [0373] A hallmark of histone deacetylase (HDAC) inhibition is the increase in the acetylation level of histones. Histone acetylation, including H3, H4 and H2A
can be detected by immuno-blotting (western-blot). Co10205 cells, approximately 5 x105 cells, were seeded in the previously described medium, cultivated for 24 h and subsequently treated with HDAC inhibitory agents and a positive control at 10 I.JM final concentration.
After 24 h, cells were harvested and lysed according to the instruction from Sigma Mammalian Cell Lysis Kit. The protein concentration was quantified using BCA
method (Sigma Pte Ltd). The protein lysate was separated using 4-12% bis-tris SDS-PAGE gel membrane was probed using primary antibody specific for acetylated histone H3 (Upstate Pte Ltd). The detection antibody, goat anti rabbit antibody conjugated with HRP was used according to the manufacturing instruction (Pierce Pte Ltd).
After removing the detection antibody from the membrane, an enhanced chemiluminescent removing the substrate, the membrane was exposed to an X-ray film (Kodak) for 1 sec ¨20 mins. The X-ray film was developed using the X-ray film processor. The density of each band observed on the developed film could be qualitatively analyzed using UVP
Bioimaging software (UVP, Inc, Upland, CA). The values were then normalized against protein.
[0374] The results of immuno-blotting assay using acetylated histone H3 antibody are shown in Table 4 for representative compounds of this invention.

[0375] Table 4 Histone Histone Histone Acetylation Acetylation Acetylation activities activities activities Compound (Histone-3) Compound (Histone-3) Compound (Histone-3) 1 Active 30 Active 49 Active 2 Active 32 Active 50 Active 3 Active 35 Active 52 Active 7 Active 36 Active 55 Active 8 Active 37 Active 58 Active 11 Active 39 Active 63 Active 12 Active - 40 Active 65 Active 14 Active - 41 Active 68 Active 17 Active 42 Active 71 Active 19 Active 44 Active 74 Active 22 Active 45 Active 130 Active 26 Active 46 Active 28 Active 48 Active [0376] These data demonstrate that compounds of this invention inhibit histone deacetylases, thereby resulting in the accumulation of acetylated histones such as H3.
Measurement of Microsomal stability [0377] Metabolic stability measurements in the in vitro using liver microsomes aids in the prediction of the in vivo hepatic clearance and the compound stability towards phase I biotransformation reactions mediated by P450 isozymes.
[0378] Pooled human liver microsome (HLM was purchased from BD Gentest (BD
BioSciences). The incubations consisted of test compound (5 pM) or control compound (Verapamil), NADPH-generating system solution A (25 mM NADP+, 66 mM glucose-6-phosphate, 66 mM MgC12 in H20), NADPH-generating system solution B (40 Wm( ,15 glucose-6-phosphate dehydrogenase in 5 mM sodium citrate) and 1.0 mg/ml microsomal protein, respectively, in 100 mM potassium phosphate buffer (pH
7.4).
Samples are incubated for 0, 5, 15, 30, 45, 60min. Reaction is terminated with ice-cold 80% acetonitrile and 20% DMSO. Samples are subsequently centrifuged at 4 C for min at 2,000 rpm. 100 pL of the supernatant is transferred to the LC-MS Plate for analysis. Before quantitative analysis, the compound is tuned in LC/MS machine to get the optimized MS condition. Liquid chromatography is performed on a Luna C18 column (Phenomenex U.S.A, Torrance, CA) (2x5Omm, 5 pM). % remaining of compound (by area) of each time point is calculated with respect to time 0.
Plot %remaining against time (min) to obtain the curve and use the Prism software to obtain the t112. These are demonstrated in table 5.
[0379] Table 5.
Compound No T1/2 (min) Compound No T1/2 (min) 1 >30 52 >30 2 >30 58 >30 8 >30 63 >30 11 >30 68 >30 12 >30 71 >30 14 >30 74 >30 19 >30 78 >30 35 >30 80 >30 40 >30 88 >30 44 >30 108 >30 46 >30 130 >30 [0380] The measured in vitro 11/2 >30 mins for the above compounds signifies that the contribution towards the clearance of the compound due to metabolism is expected to be low in the in vivo situation and thus help in yielding longer half-life and increased exposure of the compounds.
[0381] The above results demonstrated the compounds of formula (I) were metabolically stable in human liver microsme assay. Together with the appropriate physicochemical properties, e.g., molecular weight, logP and high solubility, the above compounds could exhibit adequate pharmacological exposure and effect to the body when administrated intravenously or especially orally.
In vivo Pharmacokinetic (PK) studies [0382] Compound is dissolved in appropriate solution (saline or DMA and Cremaphor in saline) at 1 mg/ml for intravenous (IV) administration, or in 0.5% methyl cellulose, 0.1% Tween 80 in water at 5 mg/ml for oral administration. Mice are randomized according to body weight, grouped three per time point. Mice are administered single IV dose (10 mg/kg) via tail vein, or single oral dose (50 mg/kg) via gavage.
At pre-defined time points (predose, 5 or 10, 30min, 1, 2, 4, 8, and 24h), one group of mice is sacrificed by overdose CO2 and blood samples are collected by cardiac puncture. The blood samples are centrifuged immediately for 10 min at 3000 rpm to separate plasma, and plasma is kept frozen at ¨80 C until analysis by LC/MS/MS. Before sample analysis, the method is developed for LC/MS/MS assay. The method is validated for signal-response of the calibration standards, auto-sampler stability for ¨15 hours intra-day and inter-day calibration curve using eight calibration standards excluding the blank plasma. QC samples at three different concentrations in triplicates were prepared to determine the accuracy and precision. The extracted QC samples were compared to unextracted samples to determine the extraction efficiency of the analyte.
LLOQ was determined by using triplicate samples of 1ng/mL and 2ng/mL to obtain accuracy and precision at the low end. Samples are analysed using the validated method.
Data are analyzed by the non-compartmental model using WinNolin 4.0 software (Pharsight, Mountain View, CA, USA). The mean values for the plasma compound concentration-time profiles are used in mouse PK study.
[0383] The PK parameter AUG 0-last providing the information on the overall exposure of the drug in vivo is one of the key PK/PD parameters that helps in predicting the efficacy of a anticancer compound. The higher the AUC value, the better will be the efficacy of the compound. Pharmacokinetic data of selected compounds in Table were shown in Table 6 below.
[0384] Table 6. Representative pharmacokinetic data [compounds were in hydrochloric acid salt form (2HCI), dosed at 50 mg/kg, p.o.]
Compound AUCo-last (ng.h/m1) [0385] The data in Table 6 further demonstrated that compounds with high metabolic stability as shown by representative compounds in Table 5 together with the appropriate physicochemical properties, e.g., molecular weight, logP, and high solubility, were able to yield adequate pharmacological exposure and effect in the animal when administrated orally.
In vivo antineoplastic (or anti-tumor) effect of HDAC inhibiting agents:
[0386] The efficacy of the compounds of the invention can then be determined using in vivo animal xenograft studies. The animal xenograft model is one of the most commonly used in vivo cancer models.

[0387] In these studies Female athymic nude mice (Harlan), 12-14 weeks of age would be implanted subcutaneously in the flank with 5 x 106 cells of HCT116 human colon tumor cells, or with 5 x 106 cells of A2780 human ovarian tumor cells, or with 5 x 106 cells of PC3 prostate cancer cells. When the tumor reaches the size 100 mm3, the xenograft nude mice would be paired-match into various treatment groups. The selected HDAC inhibitors would be dissolved in appropriate vehicles and administered to xenograft nude mice intraperitoneally or orally daily for 21 days. The dosing volume will be 0.01m1/g body weight. Paclitaxol, used as positive control, will be prepared for intravenous administration in an appropriate vehicle. The dosing volume for Paclitaxol will be 0.01 ml/g body weight. Tumor volume will be calculated every second day or twice-a-week of post injection using the formula: Volume (mm3) = (w2 x 1)/2, where w =
width and I = length in mm of an HCT116, or A2780, or PC3 tumor. Compounds of this invention that are tested would show significant reduction in tumor volume relative to controls treated with vehicle only. Acetylated histone relative to vehicle treated control group when measured shall be accumulated. The result will therefore indicate that compounds of this invention are efficacious in treating a proliferative disease such as cancer.
[0388] The details of specific embodiments described in this invention are not to be construed as limitations. Various equivalents and modifications may be made without departing from the essence and scope of this invention, and it is understood that such equivalent embodiments are part of this invention.

Claims

What is claimed is:

1. A compound of the formula (I):
wherein R1 is a group of formula:
-(CR20R21 )m-( CR22R23)n-(CR24R25)o-NR26R27;
R2 is selected from the group consisting of: alkyl and heteroalkyl, each of which may be optionally substituted with one or more optional substituents wherein each optional substituent is selected from the group consisting of halogen, =O, -CN, alkenyl, alkynyl and alkoxy;
R3 is H;
X and Y are H;
R4 is H;
each R5 is independently selected from the group consisting of: H, alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl, each of which may be optionally substituted;
each R6 is independently selected from the group consisting of: H, alkyl, alkenyl, alkynyl, haloalkyl, heteroalkyl, cycloalkyl, heterocycloalkyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl and acyl; each of which may be optionally substituted;

each R20, R21, R22, R23, R24 and R25 is independently selected from the group consisting of: H, halogen, -CN, -NO2, -CF3, -OCF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl, arylalkenyl, cycloalkylheteroalkyl, heterocycloalkylheteroalkyl, heteroarylheteroalkyl, arylheteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkoxyheteroaryl, alkenyloxy, alkynyloxy, cycloalkylkoxy, heterocycloalkyloxy, aryloxy, arylalkyloxy, phenoxy, benzyloxy heteroaryloxy, amino, alkylamino, acylamino, aminoalkyl, arylamino, alkoxycarbonyl, alkylaminocarbonyl, sulfonyl, alkylsulfonyl, aminosulfonyl, arylsulfonyl, arylsulfinyl -COOH, -C(0)0R5, -COR5, -SH, -SR6, -OR6 and acyl, each of which may be optionally substituted; or R20 and R21 when taken together may form a group of formula =O or =S, and/or R22 and R23 when taken together may form a group of formula =O or =S, and/or R24 and R25 when taken together may form a group of formula =O or =S;
each R26 and R27 is independently selected from the group consisting of: H, halogen, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, cycloalkylalkyl, heterocycloalkylalkyl, arylalkyl, heteroarylalkyl, arylalkenyl, cycloalkylheteroalkyl, heterocycloalkylheteroalkyl, heteroarylheteroalkyl, arylheteroalkyl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, aIkenyloxy, alkynyloxy, cycloaIkylkoxy, heterocycloaIkyloxy, aryloxy, arylaIkyloxy, heteroaryloxy, amino, alkylamino, aminoalkyl, acylamino, arylamino, phenoxy, benzyloxy, COOH, alkoxycarbonyl, alkylaminocarbonyl, sulfonyl, alkylsulfonyl, alkylsulfinyl, arylsulfonyl, arylsulfinyl, aminosulfonyl, SR5, and acyl, each of which may be optionally substituted, or R26 and R27 when taken together with the nitrogen atom to which they are attached form an optionally substituted heterocycloalkyl group;
m, n and o are integers independently selected from the group consisting of 0, 1, 2, 3 and 4;
Z is ¨CH=CH- and is attached at ring position 5;
or a pharmaceutically acceptable salt thereof.

2. A compound according to claim 1 wherein the sum of m+n+o is 2 or 3.

3. A compound according to any one of claims 1 to 2 wherein R1 is selected from the group consisting of:
_(CR20R21)2-NR26R27;
-(CR22R23)2-NR26R27;
-(CR24R25)2-NR26R27;
-(CR20R21)-(CR22R23)-NR26R27;
-(CR20R21)(CR24R25)-NR26R27;
-(CR22R23)-(CR24R25)-NR26R27;
-(CR20R21)3-NR26R27;
-(CR22R23)3-NR26R27;
-(CR24R25)3-NR26R27;
-(CR20R21)2-(CR22R23)-NR26R27;
-(CR20R21)2-(CR24R25)-NR26R27;
-(CR20R21)-(CR22R23)2-NR26R27;
-(CR22R23)2-(CR24R25)-NR26R27;
-(CR20R21)-(CR24R25)2-NR26R27;
-(CR22R23)-(CR24R25)2-NR26R27; and -(CR20R21)-(CR22R23)-(CR24R25)-NR26R27.

4. A compound according to any one of claims 1 to 3 wherein the compound has the formula:

5. A compound according to any one of claims 1 to 4 wherein R20, R21, R22, R23, R24 and R25 are independently selected from the group consisting of H, alkyl, alkenyl and alkynyl.

6. A compound according to any one of claims 1 to 5 wherein R20, R21, R22, R23, R24 and R25 are independently selected from the group consisting of H and alkyl.

7. A compound according to any one of claims 1 to 6 wherein R20 and R21 are H.

8. A compound according to any one of claims 1 to 7 wherein R22 and R23 are methyl.

9. A compound according to any one of claims 1 to 8 wherein R24 and R25 are H.

10. A compound according to any one of claims 1 to 9 wherein R26 and R27 are independently selected from the group consisting of: H, alkyl, alkenyl, alkynyl, alkoxyalkyl, and acyl.

1 1. A compound according to any one of claims 1 to 10 wherein R26 and R27 are independently selected from the group consisting of: H, alkyl and acyl.

12. A compound according to any one of claims 1 to 10 wherein R26 and R27 are independently selected from the group consisting of H, methyl, ethyl, isopropyl, propyl, butyl, isobutyl, pentyl, hexyl, heptyl, acetyl and 2-methoxy-ethyl.

13. A compound according to claim 1 wherein R1 is a group of formula:

14. A
compound according to claim 1 wherein R1 is selected from the group consisting of:

15. A compound according to claim 1 wherein R1 is a group of formula:

16. A compound according to claim 1 wherein R1 is a group of formula:

17. A compound according to claim 1 wherein R1 is a group of formula:

18. A compound according to claim 1 wherein R1 is a group of formula:

19. A compound according to claim 1 wherein R1 is a group of formula:

20. A compound according to claim 1 wherein R1 is a group of formula:

21. A compound according to claim 1 wherein R1 is a group of formula:

22. A compound according to claim 1 wherein R1 is a group of formula:

23. A compound according to claim 1 wherein R1 is a group of formula:

24. A compound according to any one of claims 1 to 23wherein R2 is alkyl.

25. A compound according to claim 1 wherein R2 is selected from the group consisting of:
methyl; ethoxymethyl; 2,2,2-triflouro-ethyl; propyl; 2-2-dimethyl-propyl;
isopropyl; 3,3,3-triflouro-propyl; butyl; isobutyl; 3,3-dimethyl-butyl; but-3-enyl; but-3-yny;
pentyl; 2,4,4-trimethyl-pentyl; hexyl; hex-3-enyl; octyl; non-3-enyl; non-6-enyl; 2-methoxy-nonyl, (CH3)3CCH2CONH(CH2)2-; (CH3)3CCONH(CH2)2-; (CH3)3CCONH(CH2)-and CH3(CH2)2CONH(CH2)--

26. A compound according to any one of claims 1 to 25 wherein the optional substituent is selected from the group consisting of: halogen, =O, =S, -CN, -NO2, -CF3, -OCF3, alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, heteroaryl, hydroxy, hydroxyalkyl, alkoxy, alkoxyalkyl, alkoxyaryl, alkoxyheteroaryl, alkenyloxy, aIkynyloxy, cycloalkyloxy, cycloalkenyloxy, heterocycloalkyloxy, heterocycloalkenyloxy, aryloxy, heteroaryloxy, arylalkyl, heteroarylalkyl, arylalkyloxy, -amino, alkylamino, acylamino, aminoalkyl, arylamino, sulfonyl, alkylsulfonyl, arylsulfonyl, aminosulfonyl, aminoalkyl, alkoxyalkyl, -COOH, -COR5, -C(O)OR5, -SH, -SR5, -OR6 and acyl.

27. The compound of claim 1 wherein the compound is selected from the group consisting of 3-[1-(3-Dimethylamino-2,2-dimethyl-propyl)-2- (2,2-dimethyl-propyI)-1H-benzoimidazol-5-yl]-N-hydroxy-acrylamide and pharmaceutically acceptable salts thereof.

28. A pharmaceutical composition including a compound according to any one of claims 1 to 27 and a pharmaceutically acceptable diluent, excipient or carrier.

29. Use of a compound according to any one of claims 1 to 27 in the preparation of a medicament for the treatment of a disorder caused by, associated with or accompanied by disruptions of cell proliferation and/or angiogenesis.

30. A use according to claim 28 wherein the disorder is a proliferative disorder.

31. A use according to claim 30 wherein the proliferative disorder is cancer.

32. A use according to claim 31 wherein the cancer is colon cancer, prostate cancer, hepatoma and ovarian cancer.

33. Use of a compound according to any one of claims 1 to 27 or a pharmaceutical composition according to claim 28 to modify deacetylase activity.

34. A use according to claim 33 wherein the deacetylase activity is histone deacetylase activity.

35. A use according to claim 34 wherein the deacetylase activity is class I
histone deacetylase activity.

36. A use according to claim 34 or 35 wherein the histone deacetylase is HDAC1.

37. Use of a compound according to any one of claims 1 to 27 in the preparation of a medicament for the treatment of a disorder that can be treated by the inhibition of histone deacetylase in a patient.

38. A use according to claim 37 wherein the disorder is a Proliferative disorder.

39. The use of a compound according to any one of claims 1 to 27 in the manufacture of a medicament for the treatment of cancer.

40. A use according to claim 39 wherein the cancer is a hematologic malignancy.

41. A use according to claim 40 wherein the hematologic malignancies are selected from a group consisting of B-cell lymphoma, T-cell lymphoma and leukemia.

42. A use according to claim 41 wherein the cancer is a solid tumor.

43. A use according to claim 42 wherein the solid tumor is selected from the group consisting of breast cancer, lung cancer, ovarian cancer, prostate cancer, head and neck cancer, renal cancer, gastric cancer, colon cancer, pancreatic cancer and brain cancer.

44. A use according to claim 39 wherein the cancer is selected from the group consisting of colon cancer, prostate cancer, hepatoma and ovarian cancer.

45. Use of a compound according to any one of claims 1 to 27 in the preparation of a medicament for the treatment of a proliferative disorder.

46. A compound having the structure:

or a pharmaceutically acceptable salt thereof.

47. A pharmaceutical composition which comprises a pharmaceutically acceptable diluent, excipient, or carrier and a compound having the structure:
or a pharmaceutically acceptable salt thereof.

48. A compound for use as a medicament, the compound having the structure:
or a pharmaceutically acceptable salt thereof.

49. The compound for use of claim 48, for use in the treatment of cancer.

50. The compound for use of claim 49, wherein the cancer is colon cancer, prostate cancer, hepatoma, or ovarian cancer.

51. The compound for use of claim 49, wherein the cancer is a hematologic malignancy.