Inhibitors of IRAK4 activity

1. A compound according to Formula I:

wherein:

X is NH or O;

b is 0 or 1;

n is 0, 1, 2, 3 or 4;

R 1 and R 2 are independently H, (C 1 -C 4 )alkyl and heterocyclyl, or R 1 and R 2 can be taken together with the nitrogen to which they are attached to form a monocyclic or bicyclic (fused, bridged or spirocyclic) heterocycle containing 3-8 carbon atoms optionally containing, in addition to the nitrogen, one or two additional heteroatoms selected from N, O and S, said alkyl and heterocycle are optionally substituted with one or more substituents selected from R a ;

R 3 is (C 1 -C 4 )alkyl wherein two adjacent alkyl groups can join together and form a bridged moiety of 3-6 carbon atoms;

R 4 is absent, halo or O b (C 1 -C 4 )alkyl;

R 5 is selected from C 1 -C 4 alkyl and C 2 -C 4 alkenyl which are optionally substituted with one or more substituents selected from R b ;

R 6 is absent, halo, or O(C 1 -C 4 )alkyl;

R a is halo, oxo, OH, O b (C 1 -C 4 )alkyl, CF 3 , SO 2 (C 1 -C 4 )alkyl, or heterocyclyl, said heterocyclyl optionally substituted with one or more substituents independently selected from F, and (C 1 -C 4 )alkyl; and

R b is independently selected from OH, halo, O b (C 1 -C 4 )alkyl, and CN;

or a pharmaceutically acceptable salt or a stereoisomer thereof.

2. A compound according to claim 1 of Formula II:

wherein:

X is NH or O;

b is 0 or 1;

R 1 and R 2 are independently selected from: H, C 1 -C 4 alkyl and heterocyclyl; or R 1 and R 2 can be taken together with the nitrogen to which they are attached to form a monocyclic or bicyclic (fused, bridged or spirocyclic) heterocycle containing 3-8 carbon atoms optionally containing, in addition to the nitrogen, one or two additional heteroatoms selected from N, O and S, said alkyl and heterocycle are optionally substituted with one or more substituents independently selected from R a ;

R 5 is selected from C 1 -C 4 alkyl and C 2 -C 4 alkenyl which are optionally substituted with one or more substituents selected from R b ;

R 6 is absent, halo or C 1 -C 4 alkyl;

R a is halo, oxo, OH, O b (C 1 -C 4 )alkyl, CF 3 , SO 2 (C 1 -C 4 )alkyl, or heterocyclyl, said heterocyclyl optionally substituted with one or more substituents independently selected from F, and (C 1 -C 4 )alkyl; and

R b is independently selected from OH, halo, O b (C 1 -C 4 )alkyl, and CN;

or a pharmaceutically acceptable salt or a stereoisomer thereof.

3. A compound according to claim 2 of Formula II:

wherein:

X is NH or O;

b is 0 or 1;

R 1 and R 2 are independently selected from: H, C 1 -C 4 alkyl and tetrahydopyranyl; or R 1 and R 2 can be taken together with the nitrogen to which they are attached to form morpholinyl, azetidinyl, piperazinyl, pyrrolidinyl, piperidinyl, oxaazaspirooxtyl, oxaazapiroheptanyl and thiomorpholinyl, said alkyl, morpholinyl, azetidinyl, piperazinyl, pyrrolidinyl, piperidinyl, oxaazaspirooxtyl, oxaazapiroheptanyl and thiomorpholinyl are optionally substituted with one or more substituents independently selected from R a ;

R 5 is selected from C 1 -C 4 alkyl and C 2 -C 4 alkenyl which are optionally substituted with one or more substituents selected from R b ;

R 6 is absent, F or methyl;

R a is F, oxo, OH, O b (C 1 -C 4 )alkyl, CF 3 , SO 2 (C 1 -C 4 )alkyl, oxetanyl, pyrazolyl, tetrahydropyranyl and thiophenyl, said oxetanyl, pyrazolyl, tetrahydropyranyl and thiophenyl optionally substituted with one or more substituents independently selected from F, and (C 1 -C 4 )alkyl; and

R b is independently selected from OH, F, O b (C 1 -C 4 )alkyl, and CN;

or a pharmaceutically acceptable salt or a stereoisomer thereof.

4. A compound which is selected from:

(trans)-N1-(6,7-dimethylquinazolin-4-yl)-N4,N4-dimethylcyclohexane-1,4-diamine;

trans-N,N-dimethyl-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

6-methyl-N-(trans-4-morpholin-4-ylcyclohexyl)quinazolin-4-amine;

N-(trans-4-morpholin-4-ylcyclohexyl)-6-(trifluoromethyl)quinazolin-4-amine;

7-fluoro-6-methyl-N-(trans-4-morpholin-4-ylcyclohexyl)quinazolin-4-amine;

trans-N,N-dimethyl-N′-[6-(trifluoromethyl)quinazolin-4-yl]cyclohexane-1,4-diamine;

4-((trans)-4-((6-methylquinazolin-4-yl)oxy)cyclohexyl)morpholine;

6-methyl-N-((1R,4R)-4-(3-(methylsulfonyl)azetidin-1-yl)cyclohexyl)quinazolin-4-amine;

N-[cis-4-(3-fluoroazetidin-1-yl)cyclohexyl]-6-methylquinazolin-4-amine;

N-[trans-4-(3-fluoroazetidin-1-yl)cyclohexyl]-6-methylquinazolin-4-amine;

4-{cis-4-[(6-methylquinazolin-4-yl)amino]cyclohexyl}piperazin-2-one;

4-{trans-4-[(6-methylquinazolin-4-yl)amino]cyclohexyl}piperazin-2-one;

1-{trans-4-[(6-methylquinazolin-4-yl)amino]cyclohexyl}azetidin-3-ol;

1-{cis-4-[(6-methylquinazolin-4-yl)amino]cyclohexyl}azetidin-3-ol;

N-[trans-4-(3,3-difluoropyrrolidin-1-yl)cyclohexyl]-6-methylquinazolin-4-amine;

6-methyl-N-[trans-4-(2-oxa-6-azaspiro[3.4]oct-6-yl)cyclohexyl]quinazolin-4-amine;

6-methyl-N-{cis-4-[3-(methyl sulfonyl)azetidin-1-yl]cyclohexyl}quinazolin-4-amine;

6-methyl-N-{4-[4-(trifluoromethyl)piperidin-1-yl]cyclohexyl}quinazolin-4-amine;

6-methyl-N-{4-[4-(trifluoromethyl)piperidin-1-yl]cyclohexyl}quinazolin-4-amine;

6-methyl-N-{4-[3-(trifluoromethyl)piperidin-1-yl]cyclohexyl}quinazolin-4-amine;

6-methyl-N-{4-[2-(trifluoromethyl)piperidin-1-yl]cyclohexyl}quinazolin-4-amine;

6-methyl-N-{4-[2-(trifluoromethyl)piperidin-1-yl]cyclohexyl}quinazolin-4-amine;

6-methyl-N-{4-[3-(trifluoromethyl)piperidin-1-yl]cyclohexyl}quinazolin-4-amine;

(trans)-N1-(6-methylquinazolin-4-yl)-N4-(tetrahydro-2H-pyran-4-yl)cyclohexane-1,4-diamine;

trans-N-(6-methylquinazolin-4-yl)-N′-(tetrahydro-2H-pyran-4-ylmethyl)cyclohexane-1,4-diamine;

trans-N-[(4S)-2,2-dimethyltetrahydro-2H-pyran-4-yl]-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-(6-methylquinazolin-4-yl)-N′-(thiophen-2-ylmethyl)cyclohexane-1,4-diamine;

trans-N-[(1S)-1-cyclopropylethyl]-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-(6-methylquinazolin-4-yl)-N′-[(1S)-3,3,3-trifluoro-1-methylpropyl]cyclohexane-1,4-diamine;

(3 S)-2-methyl-3-({trans-4-[(6-methylquinazolin-4-yl)amino]cyclohexyl}amino)butan-2-ol;

trans-N-(1-methylethyl)-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-(cyclopropylmethyl)-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-[(1-methyl-1H-pyrazol-5-yl)methyl]-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-[(3-methyloxetan-3-yl)methyl]-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-(6-methylquinazolin-4-yl)-N′-(3,3,3-trifluoropropyl)cyclohexane-1,4-diamine;

trans-N-(2,2-dimethylpropyl)-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-[(1S)-2,2-difluoro-1-methylethyl]-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

trans-N-[(1S)-1-methyl-2-(methyl sulfonyl)ethyl]-N′-(6-methylquinazolin-4-yl)cyclohexane-1,4-diamine;

(trans)-N1-(6-((E)-2-cyclopropylvinyl)quinazolin-4-yl)-N4,N4-dimethylcyclohexane-1,4-diamine;

N′-(6-ethenylquinazolin-4-yl)-N,N-dimethylcyclohexane-1,4-diamine;

trans-N′-{6-[(1E)-3-methoxyprop-1-en-1-yl]quinazolin-4-yl}-N,N-dimethylcyclohexane-1,4-diamine;

6-ethyl-N-(trans-4-morpholin-4-ylcyclohexyl)quinazolin-4-amine;

4-(4-(((trans)-4-morpholinocyclohexyl)amino)quinazolin-6-yl)butanenitrile;

(trans)-N1-(6-ethylquinazolin-4-yl)-N4,N4-dimethylcyclohexane-1,4-diamine;

N,N-dimethyl-N′-[6-(1-methylethyl)quinazolin-4-yl]cyclohexane-1,4-diamine;

6-butyl-N-(trans-4-morpholin-4-ylcyclohexyl)quinazolin-4-amine;

N-(trans-4-morpholin-4-ylcyclohexyl)-6-propylquinazolin-4-amine;

2-(4-(((trans)-4-(dimethylamino)cyclohexyl)amino)quinazolin-6-yl)ethan-1-ol;

3-{4-[(trans-4-morpholin-4-ylcyclohexyl)amino]quinazolin-6-yl}propan-1-ol;

4-{4-[(trans-4-morpholin-4-ylcyclohexyl)amino]quinazolin-6-yl}butan-1-ol;

1-(4-{[trans-4-(dimethylamino)cyclohexyl]amino}quinazolin-6-yl)ethanol;

4-((trans)-4-((6-methylquinazolin-4-yl)amino)cyclohexyl)thiomorpholine-1, 1-dioxide;

N-((trans)-4-(2-oxa-6-azaspiro[3.3]heptan-6-yl)cyclohexyl)-6-methylquinazolin-4-amine;

4-(4-(((trans)-4-Morpholinocyclohexyl)amino)quinazolin-6-yl)butan-2-ol); and

(4-(((trans)-4-(dimethylamino)cyclohexyl)amino)quinazolin-6-yl)methanol;

or a pharmaceutically acceptable salt or stereoisomer thereof.

5. A pharmaceutical composition comprising a pharmaceutical carrier, and dispersed therein, a therapeutically effective amount of a compound of claim 1 .