# US 8,999,968 B2 · Kinase inhibitors and method of treating cancer with same

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- Number: US 8,999,968 B2
- Document ID: US8999968B2
- Status: Granted
- Kind: B2
- Application number: 13/935,016
- Filed: 2013-07-03
- Published: 2014-02-13
- Granted: 2015-04-07
- Earliest claimed: 2009-04-06
- Assignees: University Health Network
- Applicants: University Health Network
- Inventors: Peter Brent Sampson; Yong Liu; Sze-Wan Li; Bryan T. Forrest; Heinz W. Pauls; Louise G. Edwards; Miklos Feher; Narendra Kumar B. Patel; Guohua Pan
- Web page: https://patentgrep.com/patent/US8999968B2

## CPC

- A61K 31/553: having at least one nitrogen and one oxygen as ring hetero atoms, e.g. loxapine, staurosporine
- A61K 31/416: condensed with carbocyclic ring systems, e.g. indazole
- A61K 31/437: the heterocyclic ring system containing a five-membered ring having nitrogen as a ring hetero atom, e.g. indolizine, beta-carboline
- A61K 31/496: Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
- A61K 31/5377: not condensed and containing further heterocyclic rings, e.g. timolol
- A61K 45/06: Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
- A61P 35/00: Antineoplastic agents
- A61P 35/02: specific for leukemia
- A61P 43/00: Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
- C07D 401/14: containing three or more hetero rings
- C07D 403/04: directly linked by a ring-member-to-ring-member bond
- C07D 403/14: containing three or more hetero rings
- C07D 409/14: containing three or more hetero rings
- C07D 413/14: containing three or more hetero rings
- C07D 471/04: Ortho-condensed systems
- C07D 471/10: Spiro-condensed systems
- A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D)
- A61P: SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)

## Abstract

The invention is directed to a compound represented by the following structural formula and pharmaceutically acceptable salts thereof: Compounds represented by this structural formula are kinase inhibitors and are therefore disclosed herein for the treatment of cancer. Definitions for the variables in the structural formula are provided herein.

## Claims

### Claim 1

A method of slowing progression of cancer and/or ameliorating one or more symptoms of cancer in a subject with cancer, comprising administering an effective amount of a compound represented by the following structural formula:
or a pharmaceutically acceptable salt thereof, wherein:
ring A is optionally substituted with one or more substituents represented by Ra and ring B is optionally and independently substituted with one or more substitutents represented by Rb;
ring C is a 5-membered heteroaromatic ring wherein one of X1-X3 is N, one of X1-X3 is NR5, and one of X1-X3 is N or CR6;
Y is independently N or CH or CRa;
each of Ra and Rb independently is:
halogen, —C(O)OR1, —C(O)R1, —C(S)R1, —OC(O)R1—, —C(O)NR1R2, —C(S)NR1R2, —OC(O)NR1R2, —S(O)R1, —S(O)2R1, —SO3R1, —SO2NR1R2, —OR1, —SR1, —NR1R2, —NR2C(O)R1, —NR2S(O)R1, —NR2C(O)OR1, —NR2C(O)ONR1R2, —N(R2)C(O)NR1R2, —NR2SO2NR1R2, —NR2SO2R1; —NO2, —CN, —NCS; or two ortho Ra groups taken together form —O—[CH2]p—O—, —S—[CH2]p—S— or —[CH2]q—; or
C1-10 aliphatic group optionally substituted with one or more substituents selected from the group consisting halogen, nitro, cyano, —N(R21)2, —C(O)N(R21)2, —C(O)N(R21)2, —NR21C(O)R21, —SO2R22, —SO2N(R21)2, —NR21SO2R22, —NR21C(O)OR21, —OC(O)N(R21)2, —NR21C(O)N(R21)2, —NR21C(O)N(R21)2, —NR21SO2N(R21)2, —OR21, —SR21, C1-10 haloalkoxy, —C(O)R21, —C(O)OR21 and —OC(O)R21; or
(C0-10alkylene)-Ar1, (C2-10 alkenylene)-Ar1, wherein Ar1 is a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, C1-10 alkyl, C1-10 haloalkyl, (C1-10 haloalkoxy)C1-10alkyl, (C1-10 alkoxy)C1-10alkyl, C1-10 hydroxyalkyl, C1-10 aminoalkyl, (C1-10 alkylamino)C1-10alkyl, (C1-10 dialkylamino)C1-10alkyl, —N(R21)2, —C(O)N(R21)2, —C(O)N(R21)2, —NR21C(O)R21, —SO2R22, —SO2N(R21)2, —NR21SO2R22, —NR21C(O)N(R21)2, —NRC(O)ON(R)2, —NR21SO2N(R21)2, —OR21, —SR21, C1-10haloalkoxy, —C(O)R21, —C(O)OR21, —OC(O)R21, phenyl and 5-6 membered heteroaryl, wherein said phenyl and said 5-6 membered heteroaryl are each independently and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy;
each R1 independently is:
i) hydrogen;
ii) a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, —NO2, —CN, —NCS, C1-C10 aliphatic, (C1-10-alkylene)-Ar10, (C2-10 alkenylene)-Ar10, —C(O)OR10, —C(O)R10, —C(S)R10, —OC(O)R10, —C(O)N(R11)2, —C(S)N(R11)2, —OC(O)N(R11)2, —S(O)R12, —S(O)2R12, —SO3R12, —SO2N(R11)2, —OR10, —SR10, —N(R11)2, —NR11C(O)R10, —NR11S(O)R12, —NR11C(O)OR12, —N(R11)C(O)N(R11)2, —NR11SO2N(R11)2 and —NR11SO2R12; or
iii) a C1-10 aliphatic group optionally substituted with one or more substituents selected from the group consisting of halogen, —NO2, —CN, —NCS, Ar10, —C(O)OR10, —C(O)R10, —C(S)R10, —OC(O)R10, —C(O)N(R11)2, —C(S)N(R11)2, —OC(O)N(R11)2, —S(O)R12, —S(O)2R12, —SO3R12, —SO2N(R11)2, —OR10, —SR10, —N(R11)2, —NR11C(O)R10, —NR11S(O)R12, —NR11C(O)OR12, —N(R11)C(O)N(R11)2, —NR11SO2N(R11)2 and —NR11SO2R12,
provided that R1 is other than hydrogen when Ra or Rb is —S(O)R1, —S(O)2R1, —SO3R1, —NR2S(O)R1 or —NR2SO2R1; and
each R2 independently is —H or C1-C6 alkyl, or, taken together with NR1, forms a non-aromatic heterocyclic group optionally substituted with one or more substituents selected from the group consisting of ═O, ═S, halogen, nitro, cyano, hydroxy, C1-6alkyl, C1-6 haloalkyl, C1-6 hydroxyalkyl, amino, C1-6 alkylamino, C1-6 dialkylamino, C1-6 aminoalkyl, (C1-6 alkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkyl, (phenyl)C1-6 alkyl, (5-6 membered heteroaryl)C1-6 alkyl, C1-6alkoxy, C1-6haloalkoxy, C1-6alkylcarbonyloxy, C1-6 alkoxycarbonyl, C1-6alkylcarbonyl, phenyl and 5-6 membered heteroaryl;
R3 is —H, halogen, C1-6 alkyl or C1-6 haloalkyl;
each of R4 and R5 independently is —H, C1-6 alkyl, phenyl, —C(O)(C1-6 alkyl), —C(O)(phenyl), —C(O)O(C1-6alkyl), —C(O)O(phenyl), —S(O)2(C1-6alkyl) or —S(O)2(phenyl), wherein each alkyl in the groups represented by R4 and R5 independently is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, —C(O)NH2, phenyl, 5-6 membered heteroaryl, C1-6 alkoxy, C1-6alkylamino, C1-6dialkylamino and C1-6haloalkoxy, and wherein each phenyl in the groups represented by R4 and R5 independently is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy and C1-6 haloalkoxy;
R6 is hydrogen, halogen, nitro, cyano, R′, —OR, —SR, —N(R)2, —C(O)R, —C(O)OR, —OC(O)R, —C(O)N(R)2, —OC(O)N(R)2, —NRC(O)R, —NRC(O)OR, —SOR′, —SO2R′, —SO3R′, —SO2N(R)2, —NRS(O)R′, —NRSO2R′, —NRC(O)N(R)2, —NRC(O)ON(R)2, or —NRSO2N(R)2;
each R10 independently is:
i) hydrogen;
ii) a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, hydroxy, C1-10 alkyl, C1-10 haloalkyl, (C1-10 haloalkoxy)C1-10alkyl, (C1-10 alkoxy)C1-10alkyl, C1-10 hydroxyalkyl, C1-10 aminoalkyl, (C1-10 alkylamino)C1-10alkyl, (C1-10 dialkylamino)C1-10 alkyl, (phenyl)C1-10 alkyl, (5-6 membered heteroaryl)C1-10 alkyl, amino, C1-10 alkylamino, C1-10 dialkylamino, C1-10 alkoxy, C1-10 haloalkoxy, C1-10 alkylcarbonyloxy, C1-10 alkoxycarbonyl and C1-10 alkylcarbonyl; or
iii) a C1-10 alkyl group optionally substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, hydroxy, C1-10 haloalkyl, C1-10alkoxy, C1-10haloalkoxy, amino, C1-10alkylamino, C1-10 dialkylamino, C1-10 alkylcarbonyloxy, C1-10 alkoxycarbonyl, C1-10 alkylcarbonyl and phenyl, said phenyl being optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy;
each R11 independently is R10, —CO2R10, —SO2R10 or —C(O)R10, or
—N(R11)2 taken together is a non-aromatic heterocyclic group optionally substituted with one or more substituents selected from the group consisting of ═O, ═S, halogen, nitro, cyano, hydroxy, C1-6 alkyl, C1-6 haloalkyl, C1-6 hydroxyalkyl, amino, C1-6 alkylamino, C1-6 dialkylamino, C1-6 aminoalkyl, (C1-6 alkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 alkylcarbonyloxy, C1-6 alkoxycarbonyl and C1-6 alkylcarbonyl; and
each R12 independently is R10 provided that R12 is not hydrogen;
each R21 independently is hydrogen, C1-6 alkyl, phenyl or 5-6 membered heteroaryl, wherein each of the phenyl and heteroaryl groups represented by R21 is independently and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy, and wherein the alkyl group represented by R21 is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy; or
N(R21)2 forms a non-aromatic heterocyclic group optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, ═O, C1-3alky, C1-3haloalkyl, C1-3alkoxy, C1-3haloalkoxy and amino; and
each R22 independently C1-6 alkyl, phenyl or 5-6 membered heteroaryl, wherein each of the phenyl and heteroaryl groups represented by R22 is independently and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3alkyl, C1-3haloalkyl, C1-3alkoxy and C1-3haloalkoxy, and wherein the alkyl group represented by R22 is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy;
each R independently is hydrogen, C1-10 aliphatic, phenyl or 5-6 membered heteroaryl, wherein the aliphatic group represented by R is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, phenyl, 5-6 membered heteroaryl, C1-6 alkoxy, C1-6 haloalkoxy, and wherein each of the phenyl and heteroaryl groups represented by R, and the phenyl and heteroaryl substituents for the aliphatic group represented by R independently are optionally and independently substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-6 alkyl, C1-6 haloalkyl, C1-6 alkoxy, C1-6 haloalkoxy, or
N(R)2 forms a non-aromatic heterocyclic group optionally substituted with one or more substituents selected from the group consisting of ═O, ═S, halogen, nitro, cyano, hydroxy, C1-6 alkyl, C1-6 haloalkyl, C1-6 hydroxyalkyl, amino, C1-6 alkylamino, C1-6 dialkylamino, C1-6 aminoalkyl, (C1-6 alkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkyl, (phenyl)C1-6 alkyl, (5-6 membered heteroaryl)C1-6 alkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 alkylcarbonyloxy, C1-6 alkoxycarbonyl, C1-6 alkylcarbonyl, phenyl and 5-6 membered heteroaryl; and
each R′ independently is C1-10 aliphatic, phenyl, 5-12 membered heteroaryl or 9-12 membered heterocyclyl group, wherein the aliphatic group represented by R′ is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, phenyl, 5-12 membered heteroaryl, 9-12 membered heterocyclyl group, C1-C6 alkoxy, C1-C6 haloalkoxy, C1-6 alkylamino, C1-6 dialkylamino, —C(O)H, —C(O)(C1-C6 alkyl), —C(O)(C1-C6 haloalkyl), —C(O)(phenyl), —C(O)(non-aromatic heterocyclic group), —C(O)O(C1-C6 alkyl), —C(O)O(C1-C6 haloalkyl), —C(O)O(phenyl), —OC(O)(C1-C6 alkyl), —OC(O)(C1-C6 haloalkyl), —OC(O)(phenyl), —S(O)2(C1-C6 alkyl), —S(O)2(C1-C6 haloalkyl) and —S(O)2(phenyl), and wherein each of the phenyl, heteroaryl and heterocyclyl groups represented by R′, and the phenyl, heteroaryl and heterocyclyl groups in the substituents for the aliphatic group represented by R′ independently are optionally substituted with one or more substituents selected from the group consisting of halogen, —OH, —SH, nitro, cyano, amino, C1-6 alkylamino, C1-6 dialkylamino, (C1-6 dialkylamino)C1-6 dialkylamino, C1-C6 alkyl, C1-C6 haloalkyl, —O(C1-6alkyl), —O-(non-aromatic heterocyclic group), —S(C1-6alkyl), —O(C1-6haloalkyl), (C1-6 haloalkoxy)C1-6 alkyl, (C1-6 alkoxy)C1-6 alkyl, C1-6 hydroxyalkyl, (C1-6 aminoalkyl), (C1-6 alkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkoxy, (phenyl)C1-6 alkyl, (5-6 membered heteroaryl)C1-6 alkyl, (non-aromatic heterocyclic group)C1-6 alkyl (optionally substituted with halogen, —OH, C1-6 hydroxyalkyl, C1-6 alkyl, (C1-6 alkoxy)C1-6 alkyl, C1-6 acyl, C5-7 cycloalkyl, C1-6 alkylamino, C1-6 dialkylamino or non-aromatic heterocyclic group), (5-6 membered heteroaryl)C1-6 alkoxy, (non-aromatic heterocyclic group)C1-6 alkoxy, —C(O)(C1-C6 alkyl), —C(O)(C1-C6 haloalkyl), —C(O)(phenyl), —C(O)(non-aromatic heterocyclic group), —C(O)O(C1-C6 alkyl), —C(O)O(C1-C6 haloalkyl), —C(O)O(phenyl), —OC(O)(C1-C6 alkyl), —OC(O)(C1-C6 haloalkyl), —OC(O)(phenyl), —S(O)2NH2, —S(O)2(C1-C6 alkyl), —S(O)2(C1-6 haloalkyl), and —S(O)2(phenyl);
each Ar10 independently is a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, —OH, —SH, —O(C1-10 alkyl), —S(C1-10 alkyl), C1-10 alkyl, C1-10 haloalkyl, (C1-10 haloalkoxy)C1-10alkyl, (C1-10 alkoxy)C1-10alkyl, C1-10 hydroxyalkyl, (C1-10 aminoalkyl, (C1-10 alkylamino)C1-10alkyl, (C1-10 dialkylamino)C1-10alkyl, (phenyl)C1-10 alkyl, (5-6 membered heteroaryl)C1-10 alkyl, amino, C1-10 alkylamino, C1-10 dialkylamino, C1-10 haloalkoxy, C1-10 alkylcarbonyloxy, C1-10 alkoxycarbonyl and C1-10 alkylcarbonyl;
each p is 1, 2 or 3; and
each q is 2, 3, 4 or 5,
wherein the cancer is selected from the group consisting of neuroblastoma, glioblastoma multiforme, lymphoma, leukemia, osteosarcoma, germinoma, glioma, fibrosarcoma, gastrointestinal sarcoma, fibrous histiocytoma, round cell sarcoma, synovial sarcoma, cervical cancer,anogenital cancer, head and neck cancer, and oropharyngeal cancer.

### Claim 2 (depends on 1)

The method of claim 1, wherein the cancer is selected from the group consisting of neuroblastoma, glioblastoma multiforme, lymphoma, leukemia, osteosarcoma, germinoma, and glioma.

### Claim 3 (depends on 1)

The method of claim 1, wherein the cancer is selected from the group consisting of fibrosarcoma, gastrointestinal sarcoma, fibrous histiocytoma, round cell sarcoma, and synovial sarcoma.

### Claim 4 (depends on 1)

The method of claim 1, wherein the cancer is selected from the group consisting of cervical cancer, anogenital cancer, head and neck cancer, and oropharyngeal cancer.

### Claim 5 (depends on 1)

The method of claim 1, further comprising co-administering a therapeutic agent.

### Claim 6 (depends on 1)

The method of claim 1, wherein the compound is represented by the following structural formula:
or a pharmaceutically acceptable salt thereof.

### Claim 7 (depends on 1)

The method of claim 1, wherein the compound is represented by a structural formula selected from:
or a pharmaceutically acceptable salt thereof.

### Claim 8

A method of slowing progressinon of cancer and/or ameliorating one or more symptoms of cancer in a subject with cancer, comprising administering an effective amount of a compound represented by the following structural formula:
or a pharmaceutically acceptable salt thereof, wherein:
Ra is:
halogen, —C(O)OR1, —C(O)R1, —C(S)R1, —OC(O)R1—, —C(O)NR1R2, —C(S)NR1R2, —OC(O)NR1R2, —S(O)R1, —S(O)2R1, —SO3R1, —SO2NR1R2, —OR1, —SR1, —NR1R2, —NR2C(O)R1, —NR2S(O)R1, —NR2C(O)OR1, —NR2C(O)ONR1R2, —N(R2)C(O)NR1R2, —NR2SO2NR1R2, —NR2SO2R1; —NO2, —CN, —NCS; or
C1-10 aliphatic group optionally substituted with one or more substituents selected from the group consisting halogen, nitro, cyano, —N(R21)2, —C(O)N(R21)2, —C(O)N(R21)2, —NR21C(O)R21, —SO2R22, —SO2N(R21)2, —NR21SO2R22, —NR21C(O)OR21, —OC(O)N(R21)2, —NR1C(O)N(R21)2, —NR1C(O)N(R21)2, —NR21SO2N(R21)2, —OR21, —SR21, C1-10 haloalkoxy, —C(O)R21, —C(O)OR21 and —OC(O)R21; or
(C0-10 alkylene)-Arl, (C2-10 alkenylene)-Ar1, wherein Ar1 is a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, C1-10 alkyl, C1-10 haloalkyl, (C1-10 haloalkoxy)C1-10 alkyl, (C1-C10 alkoxy)C1-10 alkyl, C1-10 hydroxyalkyl, C1-10 aminoalkyl, (C1-10 alkylamino)C1-10 alkyl, (C1-10 dialkylamino)C1-10 alkyl, —N(R21)2, —C(O)N(R21)2, —C(O)N(R21)2, —NR21C(O)R21, —SO2R22, —SO2N(R21)2, —NR21SO2R22, —NR C(O)N(R21)2, —NRC(O)ON(R)2, —NR21SO2N(R11)2, —OR, —SR, C1-10 haloalkoxy, —C(O)R21, —C(O)OR21, —OC(O)R21, phenyl and 5-6 membered heteroaryl, wherein said phenyl and said 5-6 membered heteroaryl are each independently and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy;
each R1 independently is:
i) hydrogen;
ii) a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, —NO2, —CN, —NCS, C1-C10 aliphatic, (C1-10 alkylene)-Ar10, (C2-10 alkenylene)-Ar10, —C(O)OR10, —C(O)R10, —C(S)R10, —OC(O)R10, —C(O)N(R11)2, —C(S)N(R11)2, —OC(O)N(R11)2, —S(O)R12, —S(O)2R12, —SO3R12, —SO2N(R11)2, —OR10, —SR10, —N(R11)2, —NR11C(O)R10, —NR11S(O)R12, —NR11C(O)OR12, —N(R11)C(O)N(R11)2, —NR11SO2N(R11)2 and —NR11SO2R12; or
iii) a C1-10 aliphatic group optionally substituted with one or more substituents selected from the group consisting of halogen, —NO2, —CN, —NCS, Ar10, —C(O)OR10, —C(O)R10, —C(S)R10, —OC(O)R10, —C(O)N(R11)2, —C(S)N(R11)2, —OC(O)N(R11)2, —S(O)R12, —S(O)2R12, —SO3R12, —SO2N(R11)2, —OR10, —SR10, —N(R11)2, —NR11C(O)R10, —NR11S(O)R12, —NR11C(O)OR12, —N(R11)C(O)N(R11)2, —NR11SO2N(R11)2 and —NR11SO2R12,
provided that R1 is other than hydrogen when Ra is —S(O)R1, —S(O)2R1, —SO3R1, —NR2S(O)R1 or —NR2SO2R1; and
each R2 independently is —H or C1-C6 alkyl, or, taken together with NR1, forms a non-aromatic heterocyclic group optionally substituted with one or more substituents selected from the group consisting of ═O, ═S, halogen, nitro, cyano, hydroxy, C1-6alkyl, C1-6 haloalkyl, C1-6hydroxyalkyl, amino, C1-6alkylamino, C1-6dialkylamino, C1-6-aminoalkyl, (C1-6 alkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkyl, (phenyl)C1-6 alkyl, (5-6 membered heteroaryl)C1-6 alkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 alkylcarbonyloxy, C1-6 alkoxycarbonyl, C1-6alkylcarbonyl, phenyl and 5-6 membered heteroaryl;
R4 is —H, C1-6alkyl, phenyl, —C(O)(C1-6alkyl), —C(O)(phenyl), —C(O)O(C1-6 alkyl), —C(O)O(phenyl), —S(O)2(C1-6 alkyl) or —S(O)2(phenyl), wherein each phenyl in the group represented by R4 is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C1-6 alkyl, —O(C1-6 alkyl), C1-6 haloalkyl, C1-6 haloalkoxy, cyano and nitro;
R6 is optionally substituted phenyl, optionally substituted 5-12 membered heteroaryl, —CH2— (optionally substituted phenyl), —CH2— (optionally substituted 5-12 membered heteroaryl), —CH2—CH2— (optionally substituted phenyl), —CH2—CH2— (optionally substituted 5-12 membered heteroaryl), —CH═CH— (optionally substituted phenyl), —CH═CH— (optionally substituted 5-12 membered heteroaryl), —C≡C— (optionally substituted phenyl) or —C≡C— (optionally substituted 5-12 membered heteroaryl);
each R10 independently is:
i) hydrogen;
ii) a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, hydroxy, C1-10 alkyl, C1-10 haloalkyl, (C1-10 haloalkoxy)C1-10 alkyl, (C1-10 alkoxy)C1-10 alkyl, C1-10 hydroxyalkyl, C1-10 aminoalkyl, (C1-10 alkylamino)C1-10 alkyl, (C1-10 dialkylamino)C1-10 alkyl, (phenyl)C1-10 alkyl, (5-6 membered heteroaryl)C1-10 alkyl, amino, C1-10 alkylamino, C1-10 dialkylamino, C1-10 alkoxy, C1-10 haloalkoxy, C1-10 alkylcarbonyloxy, C1-10 alkoxycarbonyl and C1-10 alkylcarbonyl; or
iii) a C1-10 alkyl group optionally substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, hydroxy, C1-10 haloalkyl, C1-10 alkoxy, C1-10 haloalkoxy, amino, C1-10 alkylamino, C1-10 dialkylamino, C1-10 alkylcarbonyloxy, C1-10 alkoxycarbonyl, C1-10 alkylcarbonyl and phenyl, said phenyl being optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3alkyl, C1-3haloalkyl, C1-3alkoxy and C1-3 haloalkoxy;
each R11 independently is R10, —CO2R10, —SO2R10 or —C(O)R10, or
—N(R11)2 taken together is a non-aromatic heterocyclic group optionally substituted with one or more substituents selected from the group consisting of ═O, ═S, halogen, nitro, cyano, hydroxy, C1-6 alkyl, C1-6 haloalkyl, C1-6 hydroxyalkyl, amino, C1-6 alkylamino, C1-6 dialkylamino, C1-6 aminoalkyl, (C1-6 alkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkyl, C1-6 alkoxy, C1-6 haloalkoxy, C1-6 alkylcarbonyloxy, C1-6 alkoxycarbonyl and C1-6 alkylcarbonyl;
each R12 independently is R10 provided that R12 is not hydrogen;
each R21 independently is hydrogen, C1-6 alkyl, phenyl or 5-6 membered heteroaryl, wherein each of the phenyl and heteroaryl groups represented by R21 is independently and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy, and wherein the alkyl group represented by R21 is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy; or
N(R21)2 forms a non-aromatic heterocyclic group optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, ═O, C1-3 alky, C1-3 haloalkyl, C1-3 alkoxy, C1-3 haloalkoxy and amino; and
each R22 independently C1-6 alkyl, phenyl or 5-6 membered heteroaryl, wherein each of the phenyl and heteroaryl groups represented by R22 is independently and optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy, and wherein the alkyl group represented by R22 is optionally substituted with one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, C1-3 alkyl, C1-3 haloalkyl, C1-3 alkoxy and C1-3 haloalkoxy; and
each Ar10 independently is a C6-14 aryl group or a 5-14 membered heteroaryl group, each optionally and independently substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, —OH, —SH, —O(C1-10alkyl), —S(C1-10 alkyl), C1-10 alkyl, C1-10 haloalkyl, (C1-10 haloalkoxy)C1-10 alkyl, (C1-10 alkoxy)C1-10 alkyl, C1-10 hydroxyalkyl, (C1-10 aminoalkyl, (C1-10 alkylamino)C1-10 alkyl, (C1-10 dialkylamino)C1-10 alkyl, (phenyl)C1-10 alkyl, (5-6 membered heteroaryl)C1-10 alkyl, amino, C1-10 alkylamino, C1-10 dialkylamino, C1-10 haloalkoxy, C1-10 alkylcarbonyloxy, C1-10 alkoxycarbonyl and C1-10 alkylcarbonyl,
wherein the cancer is selected from the group consisting of neuroblastoma, glioblastoma multiforme, lymphoma, leukemia, osteosarcoma, germinoma, glioma, fibrosarcoma, gastrointestinal sarcoma, fibrous histiocytoma, round cell sarcoma, synovial sarcoma, cervical cancer, anogenital cancer, head and neck cancer, and oropharyngeal cancer.

### Claim 9 (depends on 8)

The method of claim 8, wherein the cancer is selected from the group consisting of neuroblastoma, glioblastoma multiforme, lymphoma, leukemia, osteosarcoma, germinoma, and glioma.

### Claim 10 (depends on 8)

The method of claim 8, wherein the cancer is selected from the group consisting of fibrosarcoma, gastrointestinal sarcoma, fibrous histiocytoma, round cell sarcoma, and synovial sarcoma.

### Claim 11 (depends on 8)

The method of claim 8, wherein the cancer is selected from the group consisting of cervical cancer, anogenital cancer, head and neck cancer, and oropharyngeal cancer.

### Claim 12 (depends on 8)

The method of claim 8, further comprising co-administering a therapeutic agent.

### Claim 13 (depends on 8)

The method of claim 8, wherein
each Ra is independently halogen, cyano, —NR1R2, —NR2C(O)R1, —C(O)OR, —OC(O)R1, —C(O)NR1R2, —NR2C(O)OR1, —N(R2)C(O)NR1R2, —OR1, —SO2NR1R2, —NR2SO2R1, C1-6 alkyl, phenyl or 5-12 membered heteroaryl, wherein the C1-6 alkyl represented by Ra is optionally substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, —OH, —SH, —O(C1-6 alkyl), —S(C1-6 alkyl), C1-6 haloalkoxy, amino, C1-6 alkylamino, C1-6 dialkylamino, C1-6 alkylcarbonyloxy, C1-6 alkoxycarbonyl and C1-6 alkylcarbonyl; and the phenyl or the 5-12 membered heteroaryl represented by Ra is optionally substituted with one or more substituents selected from the group consisting of halogen, nitro, cyano, —OH, —SH, —O(C1-6 alkyl), —S(C1-6 alkyl), C1-6 alkyl, C1-6 haloalkyl, (C1-6 haloalkoxy)C1-6 alkyl, (C1-6 alkoxy)C1-6 alkyl, C1-6 hydroxyalkyl, (C1-6 aminoalkyl), (C1-6 alkylamino)C1-6 alkyl, (C1-6 dialkylamino)C1-6 alkyl, (phenyl)C1-6 alkyl, (5-6 membered heteroaryl)C1-6 alkyl, amino, C1-6 alkylamino, C1-6 dialkylamino, C1-6 haloalkoxy, C1-6 alkylcarbonyloxy, C1-6 alkoxycarbonyl and C1-6 alkylcarbonyl; and
each R1 is independently —H or C1-6 alkyl, wherein the C1-6 alkyl is optionally substituted with one or more substituents independently selected from the group consisting of halogen, —OH, —SH, —O(C1-3 alkyl), —S(C1-3 alkyl) and C1-6 haloalkoxy; and
each R2 is independently —H or C1-6 alkyl.