Compounds and methods of use

1. A method of inhibiting SMAD-2 or ALK1-5 in an individual, comprising administering to the individual an effective amount of a compound or a pharmaceutically acceptable salt of the compound, wherein the compound is selected from the group consisting of:

4-(5-bromo-2-(5-chloro-2-fluorophenyl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)pyrimidine-5-carboxamide;

1-((4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)pyridin-3-yl)methylamino)propan-2-ol;

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(1-hydroxypropan-2-yl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(1-hydroxypropan-2-yl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(1-hydroxy-2-methylpropan-2-yl)nicotinamide;

(4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)pyridin-3-yl)(4-hydroxypiperidin-1-yl)methanone;

4-(2-(5-chloro-2-fluorophenyl)-5-vinylpyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-ethylpyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(2-hydroxypropyl)pyrimidine-5-carboxamide;

4-(2-(5-chloro-2-fluorophenyl)-5-methoxypyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

N-(2-acetamidoethyl)-4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)nicotinamide;

N-(2-amino-2-oxoethyl)-4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(dimethylamino)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(2-methoxypropan-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(2-(methylsulfonamido)ethyl)nicotinamide;

N-(2-aminoethyl)-4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)nicotinamide;

3-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)-1H-pyrazole-4-carboxamide;

3-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(2-hydroxypropyl)-1H-pyrazole-4-carboxamide;

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(1,3-dihydroxypropan-2-yl)nicotinamide;

4-(2-amino-6-(5-chloro-2-fluorophenyl)-3-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(1-hydroxybutan-2-yl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(1-hydroxy-3-methylbutan-2-yl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxyethyl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-cyclopropylnicotinamide;

N-(2-hydroxypropyl)-4-(5-isopropyl-2-phenylpyridin-4-ylamino)nicotinamide;

N-(3′-fluoro-5-isopropyl-2,2′-bipyridin-4-yl)-1H-pyrrolo [2,3-b]pyridin-4-amine;

N-(3′-fluoro-5-isopropyl-2,2′-bipyridin-4-yl)-7H-pyrrolo [2,3-d]pyrimidin-4-amine;

4-(2-(5-chloro-2-fluorophenyl)-5-cyclopropylpyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

N-(2-(5-chloro-2-fluorophenyl)-5-cyclopropylpyridin-4-yl)-1H-pyrrolo [2,3-b]pyridin-4-amine;

4-(2-(5-chloro-2-fluorophenyl)-5-(pyrrolidin-1-yl)pyridin-4-ylamino)-N-(1,3-dihydroxypropan-2-yl)nicotinamide;

(4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)pyridin-3-yl)(pyrrolidin-1-yl)methanone;

N-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-yl)-7H-pyrrolo [2,3-d]pyrimidin-4-amine;

N-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-yl)-1H-pyrazolo [3,4-d]pyrimidin-4-amine;

4-(2-(2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(4-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(3-chlorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

N-(2-hydroxypropyl)-4-(5-(prop-1-en-2-yl)-2-(3-(trifluoromethyl)phenyl)pyridin-4-ylamino)nicotinamide;

N-[2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-yl]quinolin-4-amine;

N-[2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-yl]quinolin-5-amine;

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(1-hydroxybutan-2-yl)nicotinamide;

4-(2-(5-chloro-2-fluorophenyl)-5-(trifluoromethyl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-{[2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-yl]amino}-N-(oxetan-3-yl)pyridine-3-carboxamide;

4-{[2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-yl]amino}-N-(oxolan-3-yl)pyridine-3-carboxamide;

4-(2-(2-fluoro-5-(trifluoromethoxy)phenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-{[2-(5-chloro-2-fluorophenyl)-5-(propan-2-yl)pyridin-4-yl]amino}-N-(oxetan-3-yl)pyridine-3-carboxamide;

N-[2-(5-chloro-2-fluorophenyl)-5-(propan-2-yl)pyridin-4-yl]quinolin-4-amine;

N4-(2-(5-chloro-2-fluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-yl)-N2-methylpyridine-2,4-diamine;

4-(2-(2,5-difluorophenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(2,5-difluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide;

4-(2-(2-fluoro-5-(trifluoromethyl)phenyl)-5-(prop-1-en-2-yl)pyridin-4-ylamino)-N-(2-hydroxypropyl)nicotinamide; and

4-(2-(5-chloro-2-fluorophenyl)-5-cyclopropylpyridin-4-ylamino)-N-(1,3-dihydroxypropan-2-yl)nicotinamide.

2. The method of claim 1 , further comprising administering to the individual a cancer immunotherapy.

3. The method of claim 2 , wherein the cancer immunotherapy comprises a therapy selected from the group consisting of a cell-based therapy, an antibody therapy, a cytokine therapy, and an indoleamine 2,3-dioxygenase (IDO) therapy.

4. The method of claim 3 , wherein the cancer immunotherapy comprises a cell-based therapy, wherein the cell-based therapy comprises a cell selected from the group consisting of natural killer cell, a lymphokine-activated killer cell, a cytotoxic T cell, a regulatory T cell, and a dendritic T cell.

5. The method of claim 3 , wherein the cancer immunotherapy comprises a cell-based therapy, wherein the cell-based therapy comprises sipuleucel-T.

6. The method of claim 3 , wherein the cancer immunotherapy comprises an antibody therapy.

7. The method of claim 6 , wherein the antibody therapy comprises an antibody to a cell surface receptor, wherein the cell surface receptor is selected from the group consisting of epidermal growth factor and HER2.

8. The method of claim 6 , wherein the antibody therapy comprises an antibody to an immune checkpoint molecule, wherein the immune checkpoint molecule is selected from the group consisting of PD-1, PD-L1, and CTLA-4.

9. The method of claim 6 , wherein the antibody therapy comprises an antibody selected from the group consisting of Pidilizumab, Alemtuzumab, Bevacizumab, Brentuximab vedotin, Cetuximab, Gemtuzumab ozogamicin, Ibritumomab tiuxetan, Ipilimumab, Ofatumumab, Panitumumab, Rituximab, Tositumomab, and Trastuzumab.

10. The method of claim 1 , comprising administering

N-(2-aminoethyl)-4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)nicotinamide or

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(1,3-dihydroxypropan-2-yl)nicotinamide or a pharmaceutically acceptable salt thereof.

11. The method of claim 10 , further comprising administering to the individual a cancer immunotherapy.

12. The method of claim 11 , wherein the cancer immunotherapy comprises a therapy selected from the group consisting of a cell-based therapy, an antibody therapy, a cytokine therapy, and an indoleamine 2,3-dioxygenase (IDO) therapy.

13. The method of claim 12 , wherein the cancer immunotherapy comprises a cell-based therapy, wherein the cell-based therapy comprises a cell selected from the group consisting of natural killer cell, a lymphokine-activated killer cell, a cytotoxic T cell, a regulatory T cell, and a dendritic T cell.

14. The method of claim 12 , wherein the cancer immunotherapy comprises a cell-based therapy, wherein the cell-based therapy comprises sipuleucel-T.

15. The method of claim 12 , wherein the cancer immunotherapy comprises an antibody therapy.

16. The method of claim 15 , wherein the antibody therapy comprises an antibody to a cell surface receptor, wherein the cell surface receptor is selected from the group consisting of epidermal growth factor and HER2.

17. The method of claim 15 , wherein the antibody therapy comprises an antibody to an immune checkpoint molecule, wherein the immune checkpoint molecule is selected from the group consisting of PD-1, PD-L1, and CTLA-4.

18. The method of claim 15 , wherein the antibody therapy comprises an antibody selected from the group consisting of Pidilizumab, Alemtuzumab, Bevacizumab, Brentuximab vedotin, Cetuximab, Gemtuzumab ozogamicin, Ibritumomab tiuxetan, Ipilimumab, Ofatumumab, Panitumumab, Rituximab, Tositumomab, and Trastuzumab.

19. The method of claim 1 , wherein the individual has a tumor and the tumor is selected from the group consisting of a breast tumor, a prostate tumor, a lung tumor, a skin tumor, a colorectal tumor, a pancreatic tumor, and a brain tumor.

20. The method of claim 19 , comprising administering

4-(2-(5-chloro-2-fluorophenyl)-5-isopropylpyridin-4-ylamino)-N-(1,3-dihydroxypropan-2-yl)nicotinamide or

a pharmaceutically acceptable salt thereof.

21. The method of claim 20 , wherein the pharmaceutically acceptable salt is a hydrochloride salt.