# US 10,479,802 B2 · Probes for imaging huntingtin protein

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- Number: US 10,479,802 B2
- Document ID: US10479802B2
- Status: Granted
- Kind: B2
- Application number: 15/507,208
- Filed: 2015-08-28
- Published: 2017-10-05
- Granted: 2019-11-19
- Earliest claimed: 2014-08-29
- Assignees: CHDI Foundation, Inc.
- Applicants: CHDI Foundation, Inc.
- Inventors: Celia Dominguez; Samuel Coe; Jonathan Bard; Peter David Johnson; Michael Edward Prime; Christopher John Brown; Sébastien René Gabriel Galan; Paul Richard Giles; Elise Luciennen Paulette Gadouleau; Thomas Martin Krülle; Daniel Clark-Frew; John Wityak; Alex Kiselyov; Sarah Hayes
- Web page: https://patentgrep.com/patent/US10479802B2

## CPC

- C07D 513/04: Ortho-condensed systems
- A61B 5/0035: {adapted for acquisition of images from more than one imaging mode, e.g. combining MRI and optical tomography}
- A61B 6/032: {Transmission computed tomography [CT]}
- A61B 6/037: {Emission tomography}
- A61K 51/0455: {having six-membered rings with one nitrogen as the only ring hetero atom}
- A61K 51/0459: {having six-membered rings with two nitrogen atoms as the only ring hetero atoms, e.g. piperazine}
- A61K 51/0463: {having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines}
- C07D 263/57: Aryl or substituted aryl radicals
- C07D 405/14: containing three or more hetero rings
- C07D 413/04: directly linked by a ring-member-to-ring-member bond
- C07D 413/12: linked by a chain containing hetero atoms as chain links
- C07D 413/14: containing three or more hetero rings
- C07D 471/04: Ortho-condensed systems
- C07D 498/04: Ortho-condensed systems
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- 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)

## Abstract

Provided are imaging agents comprising a compound of Formula (I), or a pharmaceutically acceptable salt thereof, and methods of their use.

## Claims

### Claim 1

A compound of Formula (I), or a pharmaceutically acceptable salt thereof,
wherein
X is NR4, O, or S;
Y is CR4 or N;
Z1, Z2, Z3, and Z4 are independently chosen from CH and N, provided that at least two of Z1, Z2, Z3, and Z4 are CH;
R1 is heteroaryl, heterocycloalkenyl, or heterocycloalkyl, each of which is optionally substituted with one or two groups independently chosen from cyano, halo, lower alkyl optionally substituted with amino, alkylamino, or di(alkyl)amino, lower alkoxy optionally substituted with lower alkoxy, optionally substituted amino, haloalkyl, di(alkyl)aminocarbonyl, alkylaminocarbonyl, and aminocarbonyl, or
R1 is phenyl optionally substituted with one or two groups independently chosen from cyano, heteroaryl, halo, phenoxy, benzyloxy, heteroaryl, lower alkyl optionally substituted with amino, (alkyl)amino, or di(alkyl)amino, lower alkoxy, optionally substituted amino, di(alkyl)aminocarbonyl, alkylaminocarbonyl, and aminocarbonyl;
L1 is —O—;
L2 is —(CR7R8)m—;
L3 is —CH═CH— or is absent;
R2 is phenyl, pyridin-2-yl, pyridin-3-yl, pyrazin-2-yl, pyrimidin-5-yl, 1H-imidazol-4-yl, 1H-imidazol-2-yl, or 1H-pyrazol-4-yl, each of which is optionally substituted with one or two groups independently chosen from halo; haloalkyl; hydroxyl; lower alkoxy; lower alkoxy substituted with lower alkoxy, amino, (alkyl)amino, (dialkyl)amino, heterocycloalkyl, heteroaryl, or halo; lower alkyl; and lower alkyl substituted with hydroxyl, lower alkoxy, amino, (alkyl)amino, or (dialkyl)amino;
R4 is chosen from hydrogen, halo, cyano, and lower alkyl;
R5 is chosen from lower alkyl, lower alkoxy, and halo;
R7 is chosen from hydrogen, hydroxyl, trifluoromethyl, and lower alkyl;
R8 is chosen from hydrogen and lower alkyl;
n is 0 or 1; and
m is 0, 1, or 2;
wherein the compound of Formula (I), or a pharmaceutically acceptable salt thereof, is labeled with one or more positron-emitting radionuclides.

### Claim 2 (depends on 1)

The compound of claim 1, wherein R1 is phenyl, pyridin-2-yl, pyridin-3-yl, pyridin-3-yl-1-oxide, pyridin-4-yl, 1H-pyrazol-4-yl, pyrazin-2-yl, pyridazin-3-yl, pyridazin-4-yl, pyrimidin-4-yl, pyrimidin-5-yl, 2,3-dihydropyridazin-3-one-6-yl, 1,2-dihydropyridin-2-one-5-yl, 1,2-dihydropyrazin-2-one-5-yl, 1,3-thiazol-5-yl, 5,6,7,8-tetrahydro-1,7-naphthyridine-7-yl, 1H-imidazol-1-yl, 1-benzofuran-2-yl, 1-benzofuran-5-yl, 2,3-dihydro-1-benzofuran-2-yl, quinolin-2-yl, or 5H,6H,7H,8H-imidazo[1,2-a]pyrazin-7-yl, each of which is optionally substituted with one or two groups independently chosen from halo, lower alkyl, lower alkoxy, and optionally substituted amino.

### Claim 3 (depends on 1)

The compound of claim 1, wherein R1 is
wherein
W is CH, N, or N(O);
p is 0, 1, or 2;
for each occurrence, R9 is independently chosen from cyano, halo, lower alkyl, lower alkyl substituted with —NR10R11, lower alkoxy, —C(O)NR10R11, and —NR10R11;
R10 is chosen from hydrogen and lower alkyl;
R11 is chosen from hydrogen and lower alkyl.

### Claim 4 (depends on 1)

The compound of claim 1, wherein R1 is
wherein
W1 and W2 are chosen from CH and N, provided that at least one of W1 and W2 is CH;
p is 0, 1, or 2; and
for each occurrence, R9 is independently chosen from lower alkyl.

### Claim 5 (depends on 1)

The compound of claim 1, wherein X is O.

### Claim 6 (depends on 1)

The compound of claim 1, wherein X is S.

### Claim 7 (depends on 1)

The compound of claim 1, wherein X is NR4.

### Claim 8 (depends on 1)

The compound of claim 1, wherein Y is CR4.

### Claim 9 (depends on 1)

The compound of claim 1, wherein Y is N.

### Claim 10 (depends on 1)

The compound of claim 1, wherein Z1, Z2, Z3, and Z4 are CH.

### Claim 11 (depends on 1)

The compound of claim 1, wherein Z1 is N and Z2, Z3, and Z4 are CH.

### Claim 12 (depends on 1)

The compound of claim 1, wherein Z2 is N and Z1, Z3, and Z4 are CH.

### Claim 13 (depends on 1)

The compound of claim 1, wherein Z2 and Z4 are N and Z1 and Z3 are CH.

### Claim 14

A compound selected from:
tert-butyl 4-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]piperazine-1-carboxylate;
4-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
4-methoxy-N-[2-(pyridin-4-yl)-1,3-benzoxazol-5-yl]benzamide;
N-[(4-methoxyphenyl)methyl]-2-(pyridin-3-yl)-1,3-benzoxazol-5-amine;
2-(3-bromopyridin-4-yl)-6-[2-(morpholin-4-yl)ethoxy]-1,3-benzothiazole;
5-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
6-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
2-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyrimidine-5-carboxamide;
5-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyrazine-2-carboxamide;
4-methoxy-N-[2-(3-methylphenyl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]benzamide;
5-(4-methoxyphenyl)-2-(pyridin-3-yl)-1,3-benzoxazole;
N-(4-methoxyphenyl)-2-(pyridin-3-yl)-1,3-benzoxazol-5-amine;
2-(pyridin-3-yl)-N-{[1,2,4]triazolo[4,3-a]pyridin-3-yl}-1,3-benzoxazol-5-amine;
2-(pyridin-3-yl)-N-(pyrimidin-4-yl)-1,3-benzoxazol-5-amine;
2-(pyridin-3-yl)-N-(pyrimidin-2-yl)-1,3-benzoxazol-5-amine;
5-(5-methoxypyridin-2-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(2-methoxypyrimidin-5-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(5-methoxypyrimidin-2-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(6-methoxypyridazin-3-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(5-methoxypyrazin-2-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
1-methyl-4-[5-(pyrimidin-5-ylmethoxy)-1-benzofuran-2-yl]-1H-pyrazole-3-carbonitrile;
4-[5-(pyrimidin-5-ylmethoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
4-{5-[(5-methoxypyridin-2-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
4-{5-[(5-methoxypyridin-2-yl)methoxy]-1-benzofuran-2-yl}pyridine;
4-{5-[(1-methyl-1H-imidazol-4-yl)methoxy]-1-benzofuran-2-yl)}pyridine-3-carbonitrile;
4-{5-[(1-methyl-1H-imidazol-2-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
5-methoxy-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-2,3-dihydro-1H-isoindol-1-one;
3-{6-[(E)-2-(4-methoxyphenyl)ethenyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
4-[5-(pyridin-3-yloxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
6-methoxy-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,2,3,4-tetrahydroisoquinolin-1-one;
dimethyl({3-[4-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)phenoxy]propyl})amine;
5-[(1-methyl-1H-pyrazol-4-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(4-methoxyphenyl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(3-methoxyphenyl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
2-(pyridin-3-yl)-5-(pyridin-3-ylmethoxy)-1,3-benzoxazole;
5-{5H,6H-imidazo[2,1-b][1,3]thiazol-3-ylmethoxy}-2-(pyridin-3-yl)-1,3-benzoxazole;
1-(pyridin-2-yl)-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]ethan-1-ol;
1-(pyridin-2-yl)-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]ethan-1-one;
6-methoxy-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,2-dihydroisoquinolin-1-one;
2-(pyridin-3-yl)-N-[2,2,2-trifluoro-1-(4-methoxyphenyl)ethyl]-[1,3]oxazolo[5,4-b]pyridin-6-amine;
3-{6-[2-(4-methoxyphenyl)ethynyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
3-{6-[(Z)-2-(4-methoxyphenyl)ethenyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-methoxy-2-[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]-2,3-dihydro-1H-isoindol-1-one;
5-[(5-methoxypyrazin-2-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
3-methoxy-6-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-5H,6H,7H-pyrrolo[3,4-b]pyridin-7-one;
2-(pyridin-3-yl)-6-(pyridin-3-ylmethoxy)-1,3-benzoxazole;
3-{6-[2-(pyridin-3-yl)ethynyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-{[(5-methoxypyridin-2-yl)oxy]methyl}-2-(pyridin-3-yl)-1,3-benzoxazole;
4-[5-(pyridin-3-ylmethoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
4-{5-[(1-methyl-1H-pyrazol-4-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
3-[5-(pyridin-3-ylmethoxy)-1-benzofuran-2-yl]pyridine-4-carbonitrile;
3-{5-[(1-methyl-1H-pyrazol-4-yl)methoxy]-1-benzofuran-2-yl}pyridine-4-carbonitrile;
3-{6-[1-(5-methoxypyridin-2-yl)ethoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
4-{5-[(5-methoxypyrazin-2-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
6-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)pyridin-3-ol;
5-{[5-(prop-2-en-1-yloxy)pyrazin-2-yl]methoxy}-2-(pyridin-3-yl)-1,3-benzoxazole;
5-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)-1,2-dihydropyrazin-2-one;
1-methyl-5-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)-1,2-dihydropyrazin-2-one;
5-[4-(5-methoxypyrimidin-2-yl)piperazin-1-yl]-2-(pyridin-3-yl)-1,3-benzoxazole;
3-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-(1-methyl-1H-pyrazol-4-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
3-{6-[(6-methoxypyridin-3-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridin-4-yl)-1,3-benzoxazole;
[(3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}phenyl)methyl]dimethylamine;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1-methyl-1H-pyrazol-4-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyrazin-2-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1-methylpiperidin-4-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1,3-thiazol-5-yl)-1,3-benzoxazole;
5-[2-(pyridin-2-yloxy)ethoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
4-[5-(1H-pyrazol-4-ylmethoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
3-{[(2-{5H,6H-imidazo[2,1-b][1,3]thiazol-3-yl}-1-benzofuran-5-yl)oxy]methyl}pyridine;
2-(3-fluoroazetidin-1-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-{3H,4H,5H,6H,7H-imidazo[4,5-c]pyridin-5-yl}-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-{2H,4H,5H,6H,7H-pyrazolo[4,3-c]pyridin-5-yl}-1,3-benzoxazole;
2-{5H,6H,7H,8H-imidazo[1,5-a]pyrazin-7-yl}-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-{5H,6H,7H-pyrrolo[3,4-b]pyridin-6-yl})-1,3-benzoxazole;
7-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-5,6,7,8-tetrahydro-1,7-naphthyridine;
2-(1H-imidazol-1-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-{5H,6H,7H,8H-imidazo[1,2-a]pyrazin-7-yl}-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
4-(5-{[1-(2-methoxyethyl)-1H-pyrazol-4-yl]methoxy}-1-benzofuran-2-yl)pyridine-3-carbonitrile;
2-[5-(2-methoxyethoxy)pyridin-3-yl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
N-(5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-2-yl)acetamide;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-2-amine;
methyl({[4-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)phenyl]methyl})amine;
4-(5-{[1-(2-hydroxyethyl)-1H-pyrazol-4-yl]methoxy}-1-benzofuran-2-yl)pyridine-3-carbonitrile;
dimethyl({2-[4-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)phenoxy]ethyl})amine;
5-{[5-(2-methoxyethoxy)pyridin-2-yl]methoxy}-2-(pyridin-3-yl)-1,3-benzoxazole;
4-[5-({1-[2-(dimethylamino)ethyl]-1H-pyrazol-4-yl}methoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-N-methylpyridin-2-amine;
3-{[(2-{2-bromo-5H,6H-imidazo[2,1-b][1,3]thiazol-3-yl}-1-benzofuran-5-yl)oxy]methyl}pyridine;
5-[(5-methoxypyrazin-2-yl)methoxy]-1-methyl-2-(pyridin-3-yl)-1H-1,3-benzodiazole;
6-[(5-methoxypyrazin-2-yl)methoxy]-1-methyl-2-(pyridin-3-yl)-1H-1,3-benzodiazole;
5-[(5-methoxypyrazin-2-yl)methoxy]-2-(pyridin-3-yl)-1H-1,3-benzodiazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(piperazin-1-yl)-1,3-benzoxazole;
N-methyl-6-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)pyridin-3-amine;
3-[5-(pyridin-3-ylmethoxy)-1-benzofuran-2-yl]-5H,6H-imidazo[2,1-b]thiazole-2-carbonitrile;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-N-methylpyridine-2-carboxamide;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1-methyl-1H-imidazol-4-yl)-1,3-benzoxazole;
5-methoxy-N-{[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]methyl}pyridin-2-amine;
4-(5-{5H,6H-imidazo[2,1-b][1,3]thiazol-3-ylmethoxy}-1-benzofuran-2-yl)pyridine-3-carbonitrile;
5-({5-[2-(morpholin-4-yl)ethoxy]pyridin-2-yl}methoxy)-2-(pyridin-3-yl)-1,3-benzoxazole;
2-bromo-6-{5-[(5-methoxypyridin-2-yl)methoxy]-1-benzofuran-2-yl}benzonitrile;
4-{[2-(4-chlorophenyl)-1,3-benzoxazol-5-yl]carbamoyl}phenyl acetate;
N-(2-phenyl-1,3-benzoxazol-5-yl)benzamide;
4-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]benzamide;
2-methoxy-N-[2-(4-methoxyphenyl)-1,3-benzoxazol-5-yl]benzamide;
4-methoxy-N-[2-(4-methoxyphenyl)-1,3-benzoxazol-5-yl]benzamide;
3-methoxy-N-[2-(4-methoxyphenyl)-1,3-benzoxazol-5-yl]benzamide;
3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-1-ium-1-olate;
2-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]acetamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1-benzofuran-2-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-6-(trifluoromethyl)pyridine-3-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]quinoxaline-2-carboxamide;
6-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-2H-1,3-benzodioxole-5-carboxamide;
3-(benzyloxy)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
3-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]quinoline-2-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-2,3-dihydro-1-benzofuran-2-carboxamide;
5-methyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]quinoxaline-6-carboxamide;
(2E)-3-(4-methoxyphenyl)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]prop-2-enamide;
5-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
3-cyano-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
4-(methylsulfanyl)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
benzyl N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]carbamate;
5-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyrazin-2-ol;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyrimidin-5-yl)-1,3-benzoxazole;
2-(2,3-dihydro-1-benzofuran-2-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-[(2R)-2,3-dihydro-1-benzofuran-2-yl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-[(2S)-2,3-dihydro-1-benzofuran-2-yl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[5-(2-methoxyethoxy)pyrimidin-2-yl]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(5-methylpyridin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(2-methylpyridin-4-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(3-phenoxyphenyl)-1,3-benzoxazole;
6-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-2-methyl-2,3-dihydropyridazin-3-one;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridazin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridazin-4-yl)-1,3-benzoxazole;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-1,2-dihydropyridin-2-one;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-1-methyl-1,2-dihydropyridin-2-one;
5-phenyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,3,4-oxadiazole-2-carboxamide;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyrimidin-4-yl)-1,3-benzoxazole;
5-[(5-bromopyridin-2-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(pyridin-2-ylmethoxy)-2-(pyridin-3-yl)-1,3-benzoxazole;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1-benzofuran-5-carboxamide;
2-phenyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyrimidine-5-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-4-(pyrimidin-2-yl)benzamide;
1-methyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1H-pyrazole-4-carboxamide;
4-[(6-methylpyrazin-2-yl)oxy]-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
4-(phenoxymethyl)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
2-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
4-cyano-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
6-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
2-methyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-4-carboxamide;
3-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
4-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
4-hydroxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
3-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,2-oxazole-5-carboxamide;
5-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
6-({[2-(1-methyl-1H-pyrazol-4-yl)-1,3-benzoxazol-5-yl]oxy}methyl)pyridin-3-ol;
5-[(5-methoxypyrazin-2-yl)methoxy]-2-(1-methyl-1H-pyrazol-4-yl)-1,3-benzoxazole;
2-methoxy-5-({[2-(1-methyl-1H-pyrazol-4-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyrazine;
3-{6-[(5-bromopyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
3-methoxy-6-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridazine;
3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}benzonitrile;
4-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}benzonitrile;
5-(1-methyl-1H-pyrazol-4-yl)-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridine;
3-methoxy-5-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridine;
4-methoxy-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridine;
2-({[2-(1-methyl-1H-pyrazol-4-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyrazine;
[(3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}phenyl)methyl](methyl)amine;
(5-methoxypyridin-2-yl)methyl N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]carbamate;
2-(5-methoxypyridin-2-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-(1-benzofuran-2-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-[6-(trifluoromethyl)pyridin-3-yl]-1,3-benzoxazole;
2-(1-benzofuran-5-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}quinoline;
2-[3-(benzyloxy)phenyl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-[4-(pyrimidin-2-yl)phenyl]-1,3-benzoxazole;
2-[(E)-2-(4-Methoxyphenyl)ethenyl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-methoxy-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyrimidine;
6-({[2-(1-methyl-1H-pyrazol-4-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridin-3-amine;
5-{5-[(5-hydroxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-N-methylpyridine-2-carboxamide;
6-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}-2-methyl-2,3-dihydropyridazin-3-one;
2-methyl-6-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)-2,3-dihydropyridazin-3-one;
2-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyrazine;
5-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}-N-methylpyridine-2-carboxamide;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-1-methyl-1,2-dihydropyrazin-2-one;
6-(6-{[5-(2-fluoroethoxy)pyridin-2-yl]methoxy}-[1,3]oxazolo[5,4-b]pyridin-2-yl)-2-methyl-2,3-dihydropyridazin-3-one;
5-methoxy-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridin-1-ium-1-olate;
3-{6-[(5-methoxy-1-oxidopyridin-1-ium-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridin-1-ium-1-olate;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-2-(methylcarbamoyl)pyridin-1-ium-1-olate;
(5-hydroxypyridin-2-yl)methyl N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]carbamate;
5-methoxy-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
5-methoxy-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
4-methoxy-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
1-methyl-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]-6-oxo-1,6-dihydropyridazine-3-carboxamide;
[(5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-3-yl)methyl](methyl)amine;
6-{5-[(5-hydroxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-2-methyl-2,3-dihydropyridazin-3-one; and
N-(5-Methoxypyridin-3-yl)-2-(pyridin-3-yl)-1,3-benzoxazole-5-carboxamide,
or a pharmaceutically acceptable salt thereof,
and wherein the compound is labeled with one or more positron-emitting radionuclides.

### Claim 15 (depends on 1)

The compound of claim 1, wherein said one or more positron-emitting radionuclides are selected from: 11C, 13N, 15O, and 18F.

### Claim 16 (depends on 1)

A method of generating diagnostic images in an individual comprising administering an effective amount of a compound of claim 1 to an individual, and generating an image of at least a part of said individual.

### Claim 17 (depends on 16)

The method of claim 16, wherein generating an image of at least a part of said individual comprises generating an image to detect a presence or absence of huntingtin protein (HTT protein) monomers or aggregates in a brain of said individual; and detecting a presence or absence of a pathologic process.

### Claim 18 (depends on 17)

The method of claim 17, wherein said HTT protein monomers or aggregates are present in the basal ganglia of said brain of said individual.

### Claim 19 (depends on 17)

The method of claim 17, wherein the pathologic process is a neurodegenerative disease.

### Claim 20 (depends on 19)

The method of claim 19, wherein the neurodegenerative disease is chosen from Alzheimer's disease, amyotrophic lateral sclerosis, Huntington's disease, Parkinson's disease, Prion disease and spinocerebellar ataxias.

### Claim 21 (depends on 20)

The method of claim 20, wherein the neurodegenerative disease is Huntington's disease (HD).

### Claim 22 (depends on 16)

The method of claim 16, wherein said effective amount of said compound comprises from about 0.1 to about 20 mCi.

### Claim 23 (depends on 16)

The method of claim 16, wherein said generating an image comprises positron emission tomography (PET) imaging, PET with concurrent computed tomography imaging (PET/CT), PET with concurrent magnetic resonance imaging (PET/MRI), or a combination thereof.

### Claim 24 (depends on 23)

The method of claim 23, wherein said generating an image comprises PET imaging.

### Claim 25

A compound selected from:
tert-butyl 4-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]piperazine-1-carboxylate;
4-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
4-methoxy-N-[2-(pyridin-4-yl)-1,3-benzoxazol-5-yl]benzamide;
N-[(4-methoxyphenyl)methyl]-2-(pyridin-3-yl)-1,3-benzoxazol-5-amine;
2-(3-bromopyridin-4-yl)-6-[2-(morpholin-4-yl)ethoxy]-1,3-benzothiazole;
5-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
6-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
2-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyrimidine-5-carboxamide;
5-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]pyrazine-2-carboxamide;
4-methoxy-N-[2-(3-methylphenyl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]benzamide;
5-(4-methoxyphenyl)-2-(pyridin-3-yl)-1,3-benzoxazole;
N-(4-methoxyphenyl)-2-(pyridin-3-yl)-1,3-benzoxazol-5-amine;
2-(pyridin-3-yl)-N-{[1,2,4]triazolo[4,3-a]pyridin-3-yl}-1,3-benzoxazol-5-amine;
2-(pyridin-3-yl)-N-(pyrimidin-4-yl)-1,3-benzoxazol-5-amine;
2-(pyridin-3-yl)-N-(pyrimidin-2-yl)-1,3-benzoxazol-5-amine;
5-(5-methoxypyridin-2-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(2-methoxypyrimidin-5-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(5-methoxypyrimidin-2-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(6-methoxypyridazin-3-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(5-methoxypyrazin-2-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
1-methyl-4-[5-(pyrimidin-5-ylmethoxy)-1-benzofuran-2-yl]-1H-pyrazole-3-carbonitrile;
4-[5-(pyrimidin-5-ylmethoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
4-{5-[(5-methoxypyridin-2-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
4-{5-[(5-methoxypyridin-2-yl)methoxy]-1-benzofuran-2-yl}pyridine;
4-{5-[(1-methyl-1H-imidazol-4-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
4-{5-[(1-methyl-1H-imidazol-2-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
5-methoxy-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-2,3-dihydro-1H-isoindol-1-one;
3-{6-[(E)-2-(4-methoxyphenyl)ethenyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
4-[5-(pyridin-3-yloxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
6-methoxy-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,2,3,4-tetrahydroisoquinolin-1-one;
dimethyl({3-[4-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)phenoxy]propyl})amine;
5-[(1-methyl-1H-pyrazol-4-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(4-methoxyphenyl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(3-methoxyphenyl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
2-(pyridin-3-yl)-5-(pyridin-3-ylmethoxy)-1,3-benzoxazole;
5-{5H,6H-imidazo[2,1-b][1,3]thiazol-3-ylmethoxy}-2-(pyridin-3-yl)-1,3-benzoxazole;
1-(pyridin-2-yl)-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]ethan-1-ol;
1-(pyridin-2-yl)-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]ethan-1-one;
6-methoxy-2-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,2-dihydroisoquinolin-1-one;
2-(pyridin-3-yl)-N-[2,2,2-trifluoro-1-(4-methoxyphenyl)ethyl]-[1,3]oxazolo[5,4-b]pyridin-6-amine;
3-{6-[2-(4-methoxyphenyl)ethynyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
3-{6-[(Z)-2-(4-methoxyphenyl)ethenyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-methoxy-2-[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]-2,3-dihydro-1H-isoindol-1-one;
5-[(5-methoxypyrazin-2-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
3-methoxy-6-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-5H,6H,7H-pyrrolo[3,4-b]pyridin-7-one;
2-(pyridin-3-yl)-6-(pyridin-3-ylmethoxy)-1,3-benzoxazole;
3-{6-[2-(pyridin-3-yl)ethynyl]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-{[(5-methoxypyridin-2-yl)oxy]methyl}-2-(pyridin-3-yl)-1,3-benzoxazole;
4-[5-(pyridin-3-ylmethoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
4-{5-[(1-methyl-1H-pyrazol-4-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
3-[5-(pyridin-3-ylmethoxy)-1-benzofuran-2-yl]pyridine-4-carbonitrile;
3-{5-[(1-methyl-1H-pyrazol-4-yl)methoxy]-1-benzofuran-2-yl}pyridine-4-carbonitrile;
3-{6-[1-(5-methoxypyridin-2-yl)ethoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
4-{5-[(5-methoxypyrazin-2-yl)methoxy]-1-benzofuran-2-yl}pyridine-3-carbonitrile;
6-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)pyridin-3-ol;
5-{[5-(prop-2-en-1-yloxy)pyrazin-2-yl]methoxy}-2-(pyridin-3-yl)-1,3-benzoxazole;
5-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)-1,2-dihydropyrazin-2-one;
1-methyl-5-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)-1,2-dihydropyrazin-2-one;
5-[4-(5-methoxypyrimidin-2-yl)piperazin-1-yl]-2-(pyridin-3-yl)-1,3-benzoxazole;
3-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-(1-methyl-1H-pyrazol-4-yl)-2-(pyridin-3-yl)-1,3-benzoxazole;
3-{6-[(6-methoxypyridin-3-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridin-4-yl)-1,3-benzoxazole;
[(3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}phenyl)methyl]dimethylamine;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1-methyl-1H-pyrazol-4-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyrazin-2-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1-methylpiperidin-4-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1,3-thiazol-5-yl)-1,3-benzoxazole;
5-[2-(pyridin-2-yloxy)ethoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
4-[5-(1H-pyrazol-4-ylmethoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
3-{[(2-{5H,6H-imidazo[2,1-b][1,3]thiazol-3-yl}-1-benzofuran-5-yl)oxy]methyl}pyridine;
2-(3-fluoroazetidin-1-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-{3H,4H,5H,6H,7H-imidazo[4,5-c]pyridin-5-yl}-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-{2H,4H,5H,6H,7H-pyrazolo[4,3-c]pyridin-5-yl}-1,3-benzoxazole;
2-{5H,6H,7H,8H-imidazo[1,5-a]pyrazin-7-yl}-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-{5H,6H,7H-pyrrolo[3,4-b]pyridin-6-yl}-1,3-benzoxazole;
7-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-5,6,7,8-tetrahydro-1,7-naphthyridine;
2-(1H-imidazol-1-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-{5H,6H,7H,8H-imidazo[1,2-a]pyrazin-7-yl}-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
4-(5-{[1-(2-methoxyethyl)-1H-pyrazol-4-yl]methoxy}-1-benzofuran-2-yl)pyridine-3-carbonitrile;
2-[5-(2-methoxyethoxy)pyridin-3-yl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
N-(5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-2-yl)acetamide;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-2-amine;
methyl({[4-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)phenyl]methyl})amine;
4-(5-{[1-(2-hydroxyethyl)-1H-pyrazol-4-yl]methoxy}-1-benzofuran-2-yl)pyridine-3-carbonitrile;
dimethyl({2-[4-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)phenoxy]ethyl})amine;
5-{[5-(2-methoxyethoxy)pyridin-2-yl]methoxy}-2-(pyridin-3-yl)-1,3-benzoxazole;
4-[5-({1-[2-(dimethylamino)ethyl]-1H-pyrazol-4-yl}methoxy)-1-benzofuran-2-yl]pyridine-3-carbonitrile;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-N-methylpyridin-2-amine;
3-{[(2-{2-bromo-5H,6H-imidazo[2,1-b][1,3]thiazol-3-yl}-1-benzofuran-5-yl)oxy]methyl}pyridine;
5-[(5-methoxypyrazin-2-yl)methoxy]-1-methyl-2-(pyridin-3-yl)-1H-1,3-benzodiazole;
6-[(5-methoxypyrazin-2-yl)methoxy]-1-methyl-2-(pyridin-3-yl)-1H-1,3-benzodiazole;
5-[(5-methoxypyrazin-2-yl)methoxy]-2-(pyridin-3-yl)-1H-1,3-benzodiazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(piperazin-1-yl)-1,3-benzoxazole;
N-methyl-6-({[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]oxy}methyl)pyridin-3-amine;
3-[5-(pyridin-3-ylmethoxy)-1-benzofuran-2-yl]-5H,6H-imidazo[2,1-b][1,3]thiazole-2-carbonitrile;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-N-methylpyridine-2-carboxamide;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(1-methyl-1H-imidazol-4-yl)-1,3-benzoxazole;
5-methoxy-N-{[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]methyl}pyridin-2-amine;
4-(5-{5H,6H-imidazo[2,1-b][1,3]thiazol-3-ylmethoxy}-1-benzofuran-2-yl)pyridine-3-carbonitrile;
5-({5-[2-(morpholin-4-yl)ethoxy]pyridin-2-yl}methoxy)-2-(pyridin-3-yl)-1,3-benzoxazole;
2-bromo-6-{5-[(5-methoxypyridin-2-yl)methoxy]-1-benzofuran-2-yl}benzonitrile;
4-{[2-(4-chlorophenyl)-1,3-benzoxazol-5-yl]carbamoyl}phenyl acetate;
N-(2-phenyl-1,3-benzoxazol-5-yl)benzamide;
4-methoxy-N-[2-(3-methylphenyl)-1,3-benzoxazol-5-yl]benzamide;
2-methoxy-N-[2-(4-methoxyphenyl)-1,3-benzoxazol-5-yl]benzamide;
4-methoxy-N-[2-(4-methoxyphenyl)-1,3-benzoxazol-5-yl]benzamide;
3-methoxy-N-[2-(4-methoxyphenyl)-1,3-benzoxazol-5-yl]benzamide;
3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-1-ium-1-olate;
2-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]acetamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1-benzofuran-2-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-6-(trifluoromethyl)pyridine-3-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]quinoxaline-2-carboxamide;
6-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-2H-1,3-benzodioxole-5-carboxamide;
3-(benzyloxy)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
3-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]quinoline-2-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-2,3-dihydro-1-benzofuran-2-carboxamide;
5-methyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]quinoxaline-6-carboxamide;
(2E)-3-(4-methoxyphenyl)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]prop-2-enamide;
5-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
3-cyano-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
4-(methylsulfanyl)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
benzyl N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]carbamate;
5-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyrazin-2-ol;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyrimidin-5-yl)-1,3-benzoxazole;
2-(2,3-dihydro-1-benzofuran-2-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-[(2R)-2,3-dihydro-1-benzofuran-2-yl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-[(2S)-2,3-dihydro-1-benzofuran-2-yl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[5-(2-methoxyethoxy)pyrimidin-2-yl]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(5-methylpyridin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(2-methylpyridin-4-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(3-phenoxyphenyl)-1,3-benzoxazole;
6-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-2-methyl-2,3-dihydropyridazin-3-one;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridazin-3-yl)-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyridazin-4-yl)-1,3-benzoxazole;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-1,2-dihydropyridin-2-one;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-1-methyl-1,2-dihydropyridin-2-one;
5-phenyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,3,4-oxadiazole-2-carboxamide;
5-[(5-methoxypyridin-2-yl)methoxy]-2-(pyrimidin-4-yl)-1,3-benzoxazole;
5-[(5-bromopyridin-2-yl)methoxy]-2-(pyridin-3-yl)-1,3-benzoxazole;
5-(pyridin-2-ylmethoxy)-2-(pyridin-3-yl)-1,3-benzoxazole;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1-benzofuran-5-carboxamide;
2-phenyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyrimidine-5-carboxamide;
N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-4-(pyrimidin-2-yl)benzamide;
1-methyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1H-pyrazole-4-carboxamide;
4-[(6-methylpyrazin-2-yl)oxy]-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
4-(phenoxymethyl)-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
2-phenoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
4-cyano-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]benzamide;
6-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
2-methyl-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-4-carboxamide;
3-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
4-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
4-hydroxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
3-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]-1,2-oxazole-5-carboxamide;
5-methoxy-N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
6-({[2-(1-methyl-1H-pyrazol-4-yl)-1,3-benzoxazol-5-yl]oxy}methyl)pyridin-3-ol;
5-[(5-methoxypyrazin-2-yl)methoxy]-2-(1-methyl-1H-pyrazol-4-yl)-1,3-benzoxazole;
2-methoxy-5-({[2-(1-methyl-1H-pyrazol-4-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyrazine;
3-{6-[(5-bromopyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridine;
3-methoxy-6-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridazine;
3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}benzonitrile;
4-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}benzonitrile;
5-(1-methyl-1H-pyrazol-4-yl)-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridine;
3-methoxy-5-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridine;
4-methoxy-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridine;
2-({[2-(1-methyl-1H-pyrazol-4-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyrazine;
[(3-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}phenyl)methyl](methyl)amine;
(5-methoxypyridin-2-yl)methyl N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]carbamate;
2-(5-methoxypyridin-2-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-(1-benzofuran-2-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-[6-(trifluoromethyl)pyridin-3-yl]-1,3-benzoxazole;
2-(1-benzofuran-5-yl)-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
2-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}quinoline;
2-[3-(benzyloxy)phenyl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-[(5-methoxypyridin-2-yl)methoxy]-2-[4-(pyrimidin-2-yl)phenyl]-1,3-benzoxazole;
2-[(E)-2-(4-Methoxyphenyl)ethenyl]-5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazole;
5-methoxy-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyrimidine;
6-({[2-(1-methyl-1H-pyrazol-4-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridin-3-amine;
5-{5-[(5-hydroxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-N-methylpyridine-2-carboxamide;
6-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}-2-methyl-2,3-dihydropyridazin-3-one;
2-methyl-6-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)-2,3-dihydropyridazin-3-one;
2-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyrazine;
5-{6-[(5-methoxypyridin-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}-N-methylpyridine-2-carboxamide;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-1-methyl-1,2-dihydropyrazin-2-one;
6-(6-{[5-(2-fluoroethoxy)pyridin-2-yl]methoxy}-[1,3]oxazolo[5,4-b]pyridin-2-yl)-2-methyl-2,3-dihydropyridazin-3-one;
5-methoxy-2-({[2-(pyridin-3-yl)-[1,3]oxazolo[5,4-b]pyridin-6-yl]oxy}methyl)pyridin-1-ium-1-olate;
3-{6-[(5-methoxy-1-oxidopyridin-1-ium-2-yl)methoxy]-[1,3]oxazolo[5,4-b]pyridin-2-yl}pyridin-1-ium-1-olate;
5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-2-(methylcarbamoyl)pyridin-1-ium-1-olate;
(5-hydroxypyridin-2-yl)methyl N-[2-(pyridin-3-yl)-1,3-benzoxazol-5-yl]carbamate;
5-methoxy-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
5-methoxy-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]pyridine-3-carboxamide;
4-methoxy-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]pyridine-2-carboxamide;
1-methyl-N-[2-(1-methyl-6-oxo-1,6-dihydropyridazin-3-yl)-1,3-benzoxazol-5-yl]-6-oxo-1,6-dihydropyridazine-3-carboxamide;
[(5-{5-[(5-methoxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}pyridin-3-yl)methyl](methyl)amine;
6-{5-[(5-hydroxypyridin-2-yl)methoxy]-1,3-benzoxazol-2-yl}-2-methyl-2,3-dihydropyridazin-3-one; and
N-(5-Methoxypyridin-3-yl)-2-(pyridin-3-yl)-1,3-benzoxazole-5-carboxamide,
or a pharmaceutically acceptable salt thereof.