Benzothiazol compounds and methods using the same for treating neurodegenerative disorders

1. A compound of Formula (I):

or a pharmaceutically acceptable salt thereof, wherein:

R 1 is cyclopropyl, wherein R 1 is substituted with one or more groups selected from the group consisting of halo, alkyl, hydroxyalkyl and haloalkyl,

R 2 and R 3 are independently —H, halo, alkyl, alkoxy, —CF 3 , or —OCF 3 ,

R 4 is aryl, monocyclic heteroaryl, cycloalkyl, or heterocyclyl, wherein R 4 is optionally substituted with one or more groups selected from the group consisting of halo, hydroxyl, alkyl, alkenyl, alkynyl, haloalkyl, hydroxyalkyl, trimethylsilylethoxymethyl, —NO 2 , —NR a R b , —NR a C(═O)R b , —NR a C(═O)NR a R b , —NR a C(═O)OR b , —OR a , —CN, —C(═O)R a , —C(═O)OR a , —C(═O)NR a R b , —OC(═O)R a , —OC(═O)OR a , —OC(═O)NR a R b , —SR a , azetidinyl, oxetanyl, tetrahydrofuranyl, furanyl, pyrrolidinyl, pyrrolyl, pyrazolyl, thiophenyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, furazanyl, oxadiazolyl, thiadiazolyl, phenyl, tetrahydropyranyl, pyranyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, piperidinyl, piperazinyl, morpholinyl and thiomorpholinyl, and

R a and R b are independently —H, halo, amino, alkyl, or haloalkyl.

2. The compound of claim 1 , wherein

R 1 is cyclopropyl, wherein R 1 is substituted with one or more groups selected from the group consisting of halo, C 1 -C 3 alkyl, C 1 -C 3 hydroxyalkyl and C 1 -C 3 haloalkyl;

R 2 and R 3 are independently —H, halo, C 1 -C 3 alkyl, C 1 -C 3 alkoxy, —CF 3 , or —OCF 3 ;

R 4 is aryl, heteroaryl, cycloalkyl, or heterocyclyl, wherein R 4 is optionally substituted with one or more groups selected from the group consisting of halo, hydroxyl, C 1 -C 3 alkyl, C 2 -C 3 alkenyl, C 2 -C 3 alkynyl, C 1 -C 3 haloalkyl, mono-C 1 -C 3 alkylamino, di-C 1 -C 3 alkylamino, —NO 2 , —NR a R b , —NR a C(═O)R b , —NR a C(═O)NR a R b , —NR a C(═O)OR b , —OR a , —CN, —C(═O)R a , —C(═O)OR a , —C(═O)NR a R b , —OC(═O)R a , —OC(═O)OR a , —OC(═O)NR a R b , —SR a , azetidinyl, oxetanyl, tetrahydrofuranyl, furanyl, pyrrolidinyl, pyrrolyl, pyrazolyl, thiophenyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, furazanyl, oxadiazolyl, thiadiazolyl, phenyl, tetrahydropyranyl, pyranyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, piperidinyl, piperazinyl, morpholinyl and thiomorpholinyl, and

R a and R b are independently —H, halo, amino, C 1 -C 3 alkyl, or C 1 -C 3 haloalkyl.

3. The compound of claim 1 , wherein

R 1 is cyclopropyl substituted with one or more selected from the group consisting of fluoro, C 1 -C 3 alkyl, C 1 -C 3 hydroxyalkyl and C 1 -C 3 fluoroalkyl,

R 2 and R 3 are independently —H, —F, —Br, —Cl, C 1 -C 3 alkyl, or —CF 3 ,

R 4 is phenyl, pyridinyl, thiophenyl, pyrazolyl, imidazolyl, isothiazolyl, thiazolyl, pyrimidinyl, pyrazinyl, oxazolyl, isoxazolyl, pyrrolyl, or pyridazinyl, wherein R 4 is optionally substituted with one or more groups selected from the group consisting of halo, hydroxyl, C 1 -C 3 alkyl, C 1 -C 3 haloalkyl, mono(C 1 -C 3 )alkylamino, di(C 1 -C 3 )alkylamino, —NR a R b , —OR a , —CN, —C(═O)R a , —C(═O)OR a , —OC(═O)R a , —OC(═O)OR a , —SR a , pyrazolyl, imidazolyl, isothiazolyl, thiazolyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl and pyrrolyl,

R a and R b are independently —H, halo, amino, C 1 -C 3 alkyl, or C 1 -C 3 haloalkyl.

4. The compound of claim 1 , wherein R 1 is cyclopropyl substituted with one or more groups selected from the group consisting of fluoro, methyl, ethyl, hydroxymethyl, and hydroxyethyl.

5. The compound of claim 1 , wherein R 1 is fluorocyclopropyl, hydroxymethylcyclopropyl, or difluorocyclopropyl; and R 2 and R 3 are independently H, methyl, or fluoro.

6. The compound of claim 1 , wherein R 4 is fluoro-methylphenyl, chloro-methylphenyl, dimethylphenyl, acetamido-methylphenyl, hydroxy-methylphenyl, hydroxypropanyl-methylphenyl, methyl-propenylphenyl, methyl-pyrrolylphenyl, methyl-thiazolylphenyl, imidazolyl-methylphenyl, cyano-methylphenyl, methyl-pyrazolylphenyl, ethynyl-methylphenyl, methylpyridinyl, fluoro-methyl-methylaminophenyl, dimethylpyridinyl, fluoro-methylpyridinyl, fluoromethyl-methylpyridinyl, cyanopyridinyl, trifluoromethyl-methylpyridinyl, hydroxymethylpyridinyl, hydroxymethyl-methylpyridinyl, hydroxyethyl-methylpyridinyl, chloro-methylpyridinyl, aminopyridinyl, acetyl-methylpyridinyl, amino-dimethylpyridinyl, hydroxyethyl-methylpyridinyl, methylpyrimidinyl, dimethylpyrimidinyl, trifluoromethylpyrimidinyl, pyrazolyl, methylthiazolyl, methyl-tetrahydropyranyl, methylpyrazolyl, methylisothiazolyl, chloro-methylisothiazolyl, or dimethylisothiazolyl.

7. The compound of claim 1 , wherein R 4 is fluoro-methylphenyl, chloro-methylphenyl, bimethylphenyl, acetamido-methylphenyl, hydroxyl-methylphenyl, methyl-propenylphenyl, ethynyl-methylphenyl, fluoro-methyl-methylaminophenyl, methyl-pyrrolylphenyl, methyl-thiazolylphenyl, cyano-methylphenyl, imidazolyl-methylphenyl, methylpyridinyl, chloro-methylpyridinyl, fluoro-methylpyridinyl, fluoromethyl-methylpyridinyl, bimethylpyridinyl, aminopyridinyl, amino-dimethylpyridinyl, methoxypyridinyl, acetyl-methylpyridinyl, hydroxymethylpyridinyl, hydroxymethyl-methylpyridinyl, hydroxyethyl-methylpyridinyl, cyanopyridinyl, trifluoromethylpyridinyl, methylthiophenyl, methylpyrimidinyl, dimethylpyrimidinyl, pyrazolyl, methylpyrazolyl, methylpyrrolyl, or methylisothiazolyl, dimethylisothiazolyl.

8. The compound of claim 1 , wherein R 4 is selected from the group consisting of phenyl, pyridinyl, pyrimidinyl, pyrazolyl, thiazolyl, pyrazolyl, thiophenyl, and isothiazolyl, wherein R 4 is optionally substituted with one or more groups selected from the group consisting of halo, alkyl, alkynyl, hydroxyalkyl, amino, cyano, acetyl, hydroxy, and haloalkyl.

9. The compound of claim 1 , wherein R 4 is selected from the group consisting of:

10. The compound of claim 1 , wherein R 1 is fluorocyclopropyl.

11. The compound of claim 1 , wherein R 1 is hydroxymethylcyclopropyl.

12. The compound of claim 11 , wherein the compound is selected from the group consisting of:

2-(hydroxymethyl)-N-(6-(4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

N-(6-(2-fluoro-6-methylphenyl)benzo[d]thiazol-2-yl)-2-(hydroxymethyl)cyclopropane-1-carboxamide; and

N-(6-(5-fluoro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)-2-(hydroxymethyl)cyclopropane-1-carboxamide.

13. The compound of claim 1 , wherein R 1 is hydroxycyclopropyl or difluorocyclopropyl.

14. The compound of claim 13 , wherein the compound is selected from the group consisting of:

2-hydroxy-N-(6-(4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

2,2-difluoro-N-(6-(4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

2,2-difluoro-N-(6-(2-fluoro-6-methylphenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide; and

2,2-difluoro-N-(6-(5-fluoro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide.

15. The compound of claim 1 , wherein the compound is selected from the group consisting of:

(1S,2S)-2-fluoro-N-(6-(2-fluoro-6-methylphenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide; and

(1S,2S)-2-fluoro-N-(6-(5-fluoro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide.

16. The compound of claim 1 , wherein the compound is a compound of Formula (II):

or pharmaceutically acceptable salt thereof,

wherein R 5 is selected from the group consisting of halo, C 1 -C 3 alkyl, C 1 -C 3 hydroxyalkyl and C 1 -C 3 haloalkyl.

17. The compound of claim 16 , wherein R 4 is fluoro-methylphenyl, chloro-methylphenyl, bimethylphenyl, acetamido-methylphenyl, hydroxyl-methylphenyl, methyl-propenylphenyl, ethynyl-methylphenyl, fluoro-methyl-methylaminophenyl, methyl-pyrrolylphenyl, methyl-thiazolylphenyl, cyano-methylphenyl, imidazolyl-methylphenyl, methylpyridinyl, chloro-methylpyridinyl, fluoro-methylpyridinyl, fluoromethyl-methylpyridinyl, bimethylpyridinyl, aminopyridinyl, amino-dimethylpyridinyl, methoxypyridinyl, acetyl-methylpyridinyl, hydroxymethylpyridinyl, hydroxymethyl-methylpyridinyl, hydroxyethyl-methylpyridinyl, cyanopyridinyl, trifluoromethylpyridinyl, methylthiophenyl, methylpyrimidinyl, dimethylpyrimidinyl, pyrazolyl, methylpyrazolyl, methylpyrrolyl, methylisothiazolyl, or dimethylisothiazolyl.

18. The compound of claim 16 , wherein the compound is selected from the group consisting of:

(1S,2S)-2-fluoro-N-(6-(2-fluoro-6-methylphenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)—N-(6-(2-chloro-6-methylphenyl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)—N-(6-(2,6-dimethylphenyl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(5-fluoro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(2-methyl-5-(prop-1-en-2-yl)phenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)—N-(6-(2-chloro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)—N-(6-(2,4-dimethylpyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(5-hydroxy-2-methylphenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(5-(2-hydroxypropan-2-yl)-2-methylphenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(3-hydroxy-2-methylphenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)—N-(6-(6-amino-2,4-dimethylpyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(4-methoxypyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(3-methylthiophen-2-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(4-methylpyrimidin-5-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)—N-(6-(6-acetyl-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)—N-(6-(4,6-dimethylpyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1 S,2S)—N-(6-(6-chloro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(4-methyl-6-(trifluoromethyl)pyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(4-(hydroxymethyl)pyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(6-(hydroxymethyl)-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(6-(1-hydroxyethyl)-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(4-(trifluoromethyl)pyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)—N-(6-(1H-pyrazol-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(2-methyl-5-(1H-pyrazol-1-yl)phenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(5-(hydroxymethyl)-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(4-fluoro-6-(4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(4-fluoro-6-(2-fluoro-6-methylphenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(5-methylthiazol-4-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)—N-(6-(4,6-dimethylpyrimidin-5-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1 S,2S)—N-(6-(5-ethynyl-2-methylphenyl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1 S,2S)—N-(6-(4-chloropyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1 S,2S)—N-(6-(4-cyanopyridin-3-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(2-fluoro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(4-(trifluoromethyl)pyrimidin-5-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(2-methyl-5-(1H-pyrrol-3-yl)phenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1 S,2S)-2-fluoro-N-(6-(2-methyl-5-(thiazol-2-yl)phenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)—N-(6-(5-cyano-2-methylphenyl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(4-methyl-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazol-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(4-methyl-1H-pyrazol-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(2-methyl-5-(1H-pyrrol-2-yl)phenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(2-methyl-5-(1H-pyrazol-3-yl)phenyl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(3-methylisothiazol-5-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)—N-(6-(4-chloro-3-methylisothiazol-5-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)—N-(6-(3,4-dimethylisothiazol-5-yl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)—N-(6-(5-(1H-imidazol-2-yl)-2-methylphenyl)benzo[d]thiazol-2-yl)-2-fluorocyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(6-(6-(fluoromethyl)-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide;

(1S,2S)-2-fluoro-N-(5-fluoro-6-(4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide; and

(1S,2S)-2-fluoro-N-(6-(6-fluoro-4-methylpyridin-3-yl)benzo[d]thiazol-2-yl)cyclopropane-1-carboxamide.

19. The compound of claim 1 , wherein the salt is hydrochloric acid salt, formic acid salt, or trifluoroacetic acid salt.

20. A pharmaceutical composition comprising a therapeutically effective amount of a compound of claim 1 or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.