Substituted pyrimidine compounds and their use as SYK inhibitors

1. A compound of Formula (I):

Wherein:

R 1 , R 2 , R 3 , R 4 , R 5 , R 6a , R 6b , X and Y are as described herein:

X is CH or N;

Y is C, CH or N;

n is 1 or 2;

is a single or a double bond, provided that if Y is C, then represents a double bond;

When Y is N or CH and represents a double bond, R 2 is absent;

R 1 is selected from H, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 5 -C 8 heterocycloalkyl, aryl, arylalkyl, heteroaryl, C(O)OR 7 , and S(O) 2 R 7 , wherein C 1 -C 6 alkyl, C 5 -C 8 heterocycloalkyl, aryl, arylalkyl, or heteroaryl is optionally substituted with one or more halo, hydroxy, or OR 7 ;

When Y is C and represents a double bond, or when Y is CH or N and represents a single bond, then,

R 2 is selected from H, halo, CF 3 , C 1 -C 4 alkyl and aryl, wherein the C 1 -C 4 alkyl or aryl is optionally substituted with one or more halo, amino, hydroxy, alkoxy, or haloalkyl;

R 3 is selected from H, halo, C(O)NR 7 R 7 , C(O)R 7 , S(O) m R 7 , and S(O) m NR 7 R 7 , wherein each m is 1 or 2;

R 4 is selected from H, halo, C 1 -C 6 alkyl, and C 3 -C 7 cycloalkyl, wherein the C 1 -C 6 alkyl, or C 3 -C 7 cycloalkyl is optionally substituted with one or more halo, amino, hydroxy, alkoxy, or haloalkyl;

R 5 is selected from H, halo, C 1 -C 6 alkyl, and C 3 -C 7 cycloalkyl, wherein C 1 -C 6 alkyl or C 3 -C 7 cycloalkyl is optionally and independently substituted with one or more halo, alkoxy, or haloalkyl;

R 6a is selected from H, halo, hydroxy, CN, CH 2 OH, NH 2 , C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 10 aryl, heteroaryl, OR 7 , NR 7 R 7 , NHR 7 , and NHC(O)R 7 ;

R 6b is selected from H, CH 2 OH, CH 2 NH 2 , and C 1 -C 6 alkyl;

R 7 is independently selected from C 1 -C 6 alkyl, C 3 -C 6 alkenyl, C 3 -C 6 alkynyl, C 3 -C 7 cycloalkyl, aryl, aryl(C 1 -C 4 )alkyl, haloalkyl, heteroaryl, and heterocycloalkyl, wherein the C 1 -C 6 alkyl, C 3 -C 6 alkenyl, C 3 -C 6 alkynyl, C 3 -C 7 cycloalkyl, aryl, aryl(C 1 -C 4 )alkyl, haloalkyl, heteroaryl, or heterocycloalkyl is optionally and independently substituted with one or more substituents selected from aryl, cycloalkyl, heteroaryl, heterocycloalkyl, alkyl, halo, amino, and hydroxy;

or a pharmaceutically acceptable salt thereof.

2. The compound of claim 1 , wherein R 1 is selected from H, methyl, ethyl, propyl, isopropyl, butyl, cyclopropyl, cyclobutyl, cyclopentyl, 2-hydroxyethyl, 2-methoxyethyl, 2,2,2-trifluoroethyl, 2-fluoroethyl, ethylcarboxyl, methylsulfonyl, arylalkyl, or cyclopropylmethyl.

3. The compound of claim 1 , wherein Y is C or CH.

4. The compound of claim 1 , wherein R 2 is H, halo, CF 3 , C 1 -C 4 alkyl or aryl, wherein the C 1 -C 4 alkyl or aryl is optionally substituted with one or more halo, alkoxy, or haloalkyl.

5. The compound of claim 1 , wherein Y is N.

6. The compound of claim 1 , wherein R 3 is H, halo, C(O)NR 7 R 7 , C(O)R 7 , S(O) m R 7 , S(O) m NR 7 R 7 , wherein each m is 1 or 2.

7. The compound of claim 6 , wherein R 3 is selected from acetyl, propionyl, cyclopropyl carbonyl, fluoromethyl carbonyl, difluoromethyl carbonyl, trifluoromethyl carbonyl, methanesulfonyl, ethanesulfonyl, cyclopropanesulfonyl, benzenesulfonyl, p-toluenesulfonyl, N,N-dimethylaminocarbonyl, morpholinylcarbonyl, or pyrrolidinylcarbonyl.

8. The compound of claim 1 , wherein R 4 is selected from H, F, Cl, Br, CH 3 , CF 3 , ethyl, cyclopropyl, or cyclobutyl.

9. The compound of claim 1 , wherein R 5 is selected from H, Cl, Br, CH 3 , CF 3 , ethyl, isopropyl, cyclopropyl, cyclobutyl, or phenyl.

10. The compound of claim 1 , wherein R 6a is selected from halo, hydroxy, CN, CH 2 OH, NH 2 , C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 10 aryl, heteroaryl, OR 7 , NR 7 R 7 , NHR 7 , and NHC(O)R 7 .

11. A compound selected from the group consisting of

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)methanone;

(S)-1-(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)-2-methylpropan-1-one;

(S)-2,2,2-trifluoro-1-(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)ethanone;

(S)-2,2-difluoro-1-(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)ethanone;

(S)-ethyl 3-acetyl-5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indole-1-carboxylate;

(S)-cyclopropyl(1-ethyl-5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

(S)-2,2,2-trifluoro-1-(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)ethanone;

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-isopropyl-1H-indol-3-yl)methanone;

(S)-1-(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)ethanone;

(R)-2,2-difluoro-1-(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)ethanone;

(R)-cyclopropyl(1-ethyl-5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

cyclopropyl(1-ethyl-5-(4-(4-((4-hydroxy-4-methylisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

cyclopropyl(5-(4-(4-((4-hydroxy-4-methylisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)methanone;

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-(2,2,2-trifluoroethyl)-1H-indol-3-yl)methanone;

cyclopropyl(5-(4-(4-((4-hydroxy-4-methylisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-(2,2,2-trifluoroethyl)-1H-indol-3-yl)methanone;

(S)-1-(5-(5-chloro-4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)-2,2,2-trifluoroethanone;

(S)-2,2,2-trifluoro-1-(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)-5-methylpyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)ethanone;

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)-5-methylpyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)methanone;

(S)-cyclopropyl(1-ethyl-5-(5-fluoro-4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

(S)-cyclopropyl(1-ethyl-5-(5-fluoro-4-(3-((4-hydroxyisoxazolidin-2-yl)methyl)-4-methyl-1H-pyrrol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

(S)-cyclopropyl(1-ethyl-5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)-5-methylpyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

(S)-cyclopropyl(1-(2-fluoroethyl)-5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

cyclopropyl(1-(2-fluoroethyl)-5-(4-(4-(((S)-4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)indolin-3-yl)methanone;

(S)-cyclopropyl(5-(4-(3-cyclopropyl-4-((4-hydroxyisoxazolidin-2-yl)methyl)-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-ethyl-1H-indol-3-yl)methanone;

(S)-2-((3-methyl-1-(2-(1-methyl-3-(methylsulfonyl)-1H-indazol-5-ylamino)pyrimidin-4-yl)-1H-pyrazol-4-yl)methyl)isoxazolidin-4-ol;

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-3-methyl-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-(methylsulfonyl)-1H-indol-3-yl)methanone;

(S)-cyclopropyl(1-ethyl-5-(4-(3-((4-hydroxyisoxazolidin-2-yl)methyl)-4-methyl-1H-pyrrol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-methyl-1H-indol-3-yl)methanone;

(S)-2-((1-(2-(3-chloro-1,2-dimethyl-1H-indol-5-ylamino)pyrimidin-4-yl)-3-methyl-1H-pyrazol-4-yl)methyl)isoxazolidin-4-ol;

(S)-cyclopropyl(1-(2-fluoroethyl)-5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone;

(S)-cyclopropyl(1-(2,2-difluoroethyl)-5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1H-indol-3-yl)methanone; and

(S)-cyclopropyl(5-(4-(4-((4-hydroxyisoxazolidin-2-yl)methyl)-1H-pyrazol-1-yl)pyrimidin-2-ylamino)-1-(2,2,2-trifluoroethyl)-1H-indol-3-yl)methanone;

or a pharmaceutically acceptable salt thereof.

12. A pharmaceutical formulation comprising a compound of claim 1 , in combination with a pharmaceutically acceptable carrier, diluent, or excipient.

13. A process for preparing a compound of Formula (I) according to claim 1 , the process comprising:

viii. reacting a compound of formula (a) with a compound of formula (b) in a first organic solvent in the presence of a first base to give a compound of formula (c);

ix. reacting the compound of formula (c) with an aniline derivative of formula (d) in the presence of a second base, a ligand and a palladium catalyst in a second solvent to give a compound of formula (e);

x. reacting the compound of formula (e) with an amine derivative (f) in a third organic solvent in the presence of reducing agent such as NaBH(OAc) 3 to give a compound of Formula I;

xi. reacting the compound of formula (c) with an amine derivative (f) in a fourth organic solvent in the presence of reducing agent such as NaBH(OAc) 3 to give a compound of formula (g);

xii. reacting the compound of formula (g) with an aniline derivative formula (d) in the presence of a second base and a palladium catalyst to give a compound of Formula I;

or the compound of formula (e) is prepared by the following steps:

xiii. reacting a compound of formula (h) with a compound of formula (i) in the presence of a first base in a second organic solvent to give a compound of formula (j);

xiv. reacting the compound of formula (j) with a compound of formula (b) in a second organic solvent in the presence of a first base to give a compound of formula (e);

wherein: R 1 , R 2 , R 3 , R 4 , R 5 , R 6a , R 6b , n, X and Y are described in claim 1 .

14. A method for preparing a compound of claim 1 , the method comprising reacting a compound of formula (g)

in which R 4 , R 5 , R 6a , R 6b , n and X are as defined in claim 1 , with an aniline derivative of formula (d)

in which R 1 , R 2 , R 3 and Y are as defined in claim 1 , in the presence of a base and a palladium catalyst under conditions such that a compound of Formula (I) is prepared.

15. A method for treating a condition selected from the group consisting of systemic lupus erythematosus (SLE), discoid (cutaneous) lupus, asthma, and rheumatoid arthritis, the method comprising administering to a patient in need of such treatment an effective amount of a compound of claim 1 .

16. The method of claim 15 , wherein said compound is administered singly or in combination with one or more additional therapeutic agents.

17. The method of claim 15 wherein said compound is administered via intravenous administration, subcutaneous administration, inhalation, oral administration, rectal administration, parenteral, intravitreal administration, intramuscular administration, intranasal administration, dermal administration, topical administration, optic administration, ophthalmic administration, buccal administration, tracheal administration, bronchial administration, or sublingual administration.

18. A method for treating Non-Hodgkin's Lymphomas, the method comprising administering to a patient in need thereof an effective amount of a compound of claim 1 .

19. The method of claim 18 , wherein the Non-Hodgkin's Lymphoma is selected from the group consisting of follicular lymphoma, mantle cell lymphoma, capsule cell lymphoma, diffuse large B cell lymphoma, T-cell lymphoma, and chronic lymphocytic lymphoma.