FIELD

This application relates generally to toll-like receptor modulator compounds, including diamino pyrido[3,2 D] pyrimidine compounds, and pharmaceutical compositions which, among other things, modulate toll-like receptors (e.g. TLR-8), and methods of making and using them.

BACKGROUND

The toll-like receptor (TLR) family plays a fundamental role in pathogen recognition and activation of innate immunity. Toll-like receptor 8 (TLR-8) is predominantly expressed by myeloid immune cells and activation of this receptor stimulates a broad immunological response. Agonists of TLR-8 activate myeloid dendritic cells, monocytes, monocyte-derived dendritic cells and Kupffer cells leading to the production of proinflammatory cytokines and chemokines, such as interleukin-18 (IL-18), interleukin-12 (IL-12), tumor necrosis factor-alpha (TNF-α), and interferon-gamma (IFN-γ). Such agonists also promote the increased expression of co-stimulatory molecules such as CD8+cells, major histocompatibility complex molecules (MAIT, NK cells), and chemokine receptors.

Collectively, activation of these innate and adaptive immune responses induces an immune response and provides a therapeutic benefit in various conditions involving autoimmunity, inflammation, allergy, asthma, graft rejection, graft versus host disease (GvHD), infection, cancer, and immunodeficiency. For example, with respect to hepatitis B, activation of TLR8 on professional antigen presenting cells (pAPCs) and other intrahepatic immune cells is associated with induction of IL-12 and proinflammatory cytokines, which is expected to augment HBV-specific T cell responses, activate intrahepatic NK cells and drive reconstitution of antiviral immunity. See e.g. Wille-Reece, U. et al.J Exp Med203, 1249-1258 (2006); Peng, G. et al.,Science309, 1380-1384 (2005); Jo, J. et al.,PLoS Pathogens10, e1004210 (2014) and Watashi, K. et al.,J Biol Chem288, 31715-31727 (2013).

Given the potential to treat a wide array of diseases, there remains a need for novel modulators of toll-like receptors, for example TLR-8. Potent and selective modulators of TLR-8 that have reduced potential for off target liabilities are particularly desirable.

BRIEF SUMMARY OF THE DISCLOSURE

In one embodiment, the present disclosure provides a crystalline form of (R)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol gentisic acid:


characterized by an X-ray powder diffraction (XRPD) pattern comprising three or more peaks at 4.4°, 8.7°, 12.9°, 14.9°, 17.3°, 19.5°, 24.8°, 25.7°, or 26.3° 2θ (±0.2° 2θ), Compound I gentisic acid.

In another embodiment, the present disclosure provides a crystalline form of (R)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol hippuric acid:


characterized by an XRPD pattern comprising three or more peaks at 2.9°, 5.0°, 7.6°, 10.4°, 12.6°, 17.6°, 19.0°, 25.2°, or 28.5° 2θ (±0.2° 2θ), Compound I hippuric acid.

In another embodiment, the present disclosure provides a crystalline form of (R)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol phosphoric acid:


characterized by an XRPD pattern comprising three or more peaks at 3.7°, 6.1°, 7.1°, 12.1°, 14.2°, 21.6°, 24.0°, 27.4°, or 28.2° 2θ (±0.2° 2θ), phosphate salt Form I.

In another embodiment, the present disclosure provides a crystalline form of (R)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol phosphoric acid:


characterized by an XRPD pattern comprising three or more peaks at 5.4°, 6.3°, 15.8°, 18.1°, 18.9°, 20.6°, 24.1°, 26.7°, or 27.4° 2θ (±0.2° 2θ), phosphate salt Form II.

In another embodiment, the present disclosure provides a crystalline form of (R)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol succinic acid:


characterized by an XRPD pattern comprising three or more peaks at 4.6°, 6.8°, 9.3°, 13.2°, 17.5°, 18.7°, 19.0°, 25.7°, or 27.0° 2θ (±0.2° 2θ), Compound I succinic acid.

In another embodiment, the present disclosure provides a crystalline form of (R)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol ethanedisulfonic acid:


characterized by an XRPD pattern comprising three or more peaks at 4.4° 79° 8.7°, 13.0°, 16.6°, 20.6°, 21.1°, 22.1°, or 26.0° 2θ (±0.2° 2θ), Compound I ethanedisulfonic acid Form I.

In another embodiment, the present disclosure provides a crystalline form of (R)-2-((2-amino-7-fluoropyrido[3,2-d]pyrimidin-4-yl)amino)-2-methylhexan-1-ol ethanedisulfonic acid:


characterized by an XRPD pattern comprising three or more peaks at 4.5°, 5.6°, 8.4°, 12.9°, 13.4°, 16.6°, 17.9°, 18.3°, or 22.2° 2θ (±0.2° 2θ), Compound I ethanedisulfonic acid Form II.

