1260907-17-2

The bromodomain and extra terminal domain (BET) family of proteins, including BRD2, BRD3, and BRD4, affect inflammatory gene expression by controlling the assembly of histone acetylation-dependent chromatin complexes. I-BET762 is a synthetic compound which interacts with BET proteins with high-affinity (K_d = 32.5-42.5 nM). It blocks binding of BET proteins with acetylated histones, disrupting the formation of chromatin complexes involved in the expression of specific inflammatory genes in activated macrophages. Through these actions, I-BET762 provides protection against bacteria-induced sepsis and lipopolysaccharide-triggered endotoxic shock.

GSK 525762A, is a BET Bromodomain Inhibitor, which is now in clinical development. BET bromodomains have emerged as promising drug targets for treatment of cancers, inflammatory diseases, and other medical conditions.

ChEBI: 2-[(4S)-6-(4-chlorophenyl)-8-methoxy-1-methyl-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepin-4-yl]-N-ethylacetamide is a benzodiazepine.

I-BET762 possesses anti-inflammatory property by controlling the pro-inflammatory gene expression. I-BET762 hinders the MYC (proto-oncogene) expression in cellular models. This action of I-BET762 might serve as an effective therapy in treating prostate cancer.

Example 1: (S)-2-(6-(4-chlorophenyl)-8-methoxy-1-methyl-4H-benzo[f][1,2,4]triazolo[4,3-a][1,4]diazepin-4-yl)acetic acid (16.0 g, 40 mmol) was dissolved in THF, N,N-diisopropylethylamine (DIEA, 14 mL, 80 mmol) was added followed by 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxide hexafluorophosphate (HATU, 30.4 g, 80 mmol) was added. The reaction mixture was stirred at room temperature for 3 h. Then THF solution of ethylamine (40 mL, 2 M, 80 mmol) was added. Stirring was continued for 48 h. The reaction mixture was concentrated under reduced pressure. The crude product was suspended in water and extracted with dichloromethane (DCM). The organic layer was dried with anhydrous sodium sulfate (Na2SO4), filtered and concentrated under reduced pressure. The crude product was purified by silica gel column chromatography (DCM/MeOH, 95:5) and the resulting solid was recrystallized in acetonitrile (MeCN). Subsequently, the solid was dissolved in DCM and precipitated with diisopropyl ether (1-Pr2O) to afford (S)-2-(6-(4-chlorophenyl)-8-methoxy-1-methyl-4H-benzo[f][1,2,4]triazolo[4,3-a][1,4]diazepin-4-yl)-N-ethylacetamide (8 g, 47% yield) as a white solid. rf = 0.48 (DCM/MeOH, 90:10). Melting point >140°C (viscosity change).1H NMR (300 MHz, CDCl3) δ 7.53-7.47 (m, 2H), 7.39 (d, J = 8.9 Hz, 1H), 7.37-7.31 (m, 2H), 7.20 (dd, J = 2.9, 8.9 Hz, 1H), 6.86 (d, J = 2.9 Hz, 1H). 6.40 (m, 1H), 4.62 (m, 1H), 3.80 (s, 3H), 3.51 (dd, J = 7.3, 14.1 Hz, 1H), 3.46-3.21 (m, 3H), 2.62 (s, 3H), 1.19 (t, J = 7.3 Hz, 3H). lc/ms: m/z 424 [M(35Cl)+H]+. Retention time 2.33 min.

BET

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1) Nicodeme?et al.?(2010),?Suppression of inflammation by a synthetic histone mimic; Nature?468?1119 2) Mirguet?et al.?(2013),?Discovery of Epigenetic Regulator I-BET762: Lead Optimization to Afford a Clinical Candidate Inhibitor of the BET Bromodomains; J. Med. Chem.,?56?7501 3) Bandukwala?et al.?(2012),?Selective inhibition of CD4+ T-cell cytokine production and autoimmunity by BET protein and c-Myc inhibitors; Proc. Natl. Acad. Sci. USA,?109?14532 4) Delmore?et al.?(2011),?BET Bromodomain as a Therapeutic Strategy to Target c-Myc; Cell?146?904