Afimetoran BMS-986256, WHO 11516

cas 2171019-55-7

2-[4-[2-(7,8-dimethyl-[1,2,4]triazolo[1,5-a]pyridin-6-yl)-3-propan-2-yl-1H-indol-5-yl]piperidin-1-yl]acetamide

C₂₆H₃₂N₆O,444.583, phase 1

Afimetoran is an immunomodulator and an antagonist of toll-like receptors 7 and 8.^1,2 It is also is under investigation in clinical trial NCT04269356 (Study to Assess the Way the Body Absorbs, Distributes, Breaks Down and Eliminates Radioactive BMS-986256 in Healthy Male Participants).

US10071079, Example 15

Ref

WO2018005586 

https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018005586&_cid=P20-M0RQ0D-09010-1

The invention further pertains to pharmaceutical compositions containing at least one compound according to the invention that are useful for the treatment of conditions related to TLR modulation, such as inflammatory and autoimmune diseases, and methods of inhibiting the activity of TLRs in a mammal.

Toll/IL-1 receptor family members are important regulators of inflammation and host resistance. The Toll-like receptor family recognizes molecular patterns derived from infectious organisms including bacteria, fungi, parasites, and viruses (reviewed in Kawai, T. et al., Nature Immunol., 11:373-384 (2010)). Ligand binding to the receptor induces dimerization and recruitment of adaptor molecules to a conserved cytoplasmic motif in the receptor termed the Toll/IL-1 receptor (TIR) domain. With the exception of TLR3, all TLRs recruit the adaptor molecule MyD88. The IL-1 receptor family also contains a cytoplasmic TIR motif and recruits MyD88 upon ligand binding (reviewed in Sims, J.E. et al., Nature Rev. Immunol., 10:89-102 (2010)).

Toll-like receptors (TLRs) are a family of evolutionarily conserved, transmembrane innate immune receptors that participate in the first-line defense. As pattern recognition receptors, the TLRs protect against foreign molecules, activated by pathogen associated molecular patterns (PAMPs), or from damaged tissue, activated by danger associated molecular patterns (DAMPs). A total of 13 TLR family members have been identified, 10 in human, that span either the cell surface or the endosomal compartment. TLR7-9 are among the set that are endosomally located and respond to single-stranded RNA (TLR7and TLR8) or unmethylated single-stranded DNA containing cytosine-phosphate-guanine (CpG) motifs (TLR9).

Activation of TLR7/8/9 can initiate a variety of inflammatory responses (cytokine production, B cell activation and IgG production, Type I interferon response). In the case of autoimmune disorders, the aberrant sustained activation of TLR7/8/9 leads to worsening of disease states. Whereas overexpression of TLR7 in mice has been shown to exacerbate autoimmune disease, knockout of TLR7 in mice was found to be protective against disease in lupus-prone MRL/lpr mice. Dual knockout of TLR7 and 9 showed further enhanced protection.

As numerous conditions may benefit by treatment involving modulation of cytokines, IFN production and B cell activity, it is immediately apparent that new compounds capable of modulating TLR7 and/or TLR8 and/or TLR9 and methods of using these compounds could provide substantial therapeutic benefits to a wide variety of patients.

The present invention relates to a new class of [1,2,4]triazolo[1,5-a]pyridinyl substituted indole compounds found to be effective inhibitors of signaling through TLR7/8/9. These compounds are provided to be useful as pharmaceuticals with desirable stability, bioavailability, therapeutic index, and toxicity values that are important to their drugability.

EXAMPLE 15

2-(4-(2-(7,8-dimethyl-[1,2,4]triazolo[1,5-a]pyridin-6-yl)-3-isopropyl-1H-indol-5-yl) piperidin-1-yl)acetamide

To a reaction flask were added

6-(3-isopropyl-5-(piperidin-4-yl)-1H-indol-2-yl)-7,8-dimethyl-[1,2,4]triazolo[1,5-a]pyrid ine, 2 HCl (47.66 g, 104 mmol), DCE (220 mL), DBU (62.4 mL, 414 mmol), and 2-bromoacetamide (17.14 g, 124 mmol). The reaction flask was capped. The reaction mixture was stirred overnight at room temperature. The reaction mixture was concentrated, diluted with water, and stirred for 30 minutes then filtered. The solid was recrystallized using ethanol to afford 2-(4-(2-(7,8-dimethyl-[1,2,4]triazolo[1,5-a] pyridin-6-yl)-3-isopropyl-1H-indol-5-yl)piperidin-1-yl)acetamide (42.3 g, 93 mmol,

90% yield) as a white solid. LCMS MH⁺: 445. HPLC Ret. Time 1.20 min. Method QC-ACN-TFA-XB. ¹HNMR (400 MHz, DMSO-d₆) δ 10.97-10.86 (m, 1H), 8.78-8.69 (m, 1H), 8.54-8.40 (m, 1H), 7.64-7.49 (m, 1H), 7.30-7.21 (m, 2H), 7.17-7.09 (m, 1H), 7.06-6.93 (m, 1H), 2.99-2.82 (m, 5H), 2.62-2.54 (m, 4H), 2.24-2.12 (m, 5H), 1.92-1.72 (m, 4H), 1.37-1.29 (m, 6H).

ACS Medicinal Chemistry Letters (2022), 13(5), 812-818 83%

References

1. Bristol-Myers Squibb: Investor Series [Link]
2. Bristol-Myers Squibb: Investor Series [Link]
3. MedKoo Biosciences: Afimetoran [Link]

//////////////Afimetoran, BMS-986256, BMS 986256, WHO 11516, phase 1