A mixture of (S)-1-(6-fluoro-1-pyridin-3-yl-1H-benzoimidazol-2-yl)ethylamine (81 mg, 0.32 mmol), 6-chloro-9-(tetrahydropyran-2-yl)-9H-purine (83 mg, 0.35 mmol) and DIPEA (162 μL, 0.95 mmol) in n-butanol (1 mL) was heated at 90° C. in a sealed vial for 65 h. After cooling to RT, the volatiles were removed under reduced pressure and the resulting residue was loaded onto an Isolute® SCX-2 cartridge which and with MeOH followed by 2M NH3/MeOH (purification by SCX cartridge repeated three times). The product containing fractions were combined and concentrated in vacuo. The resulting residue was purified by column chromatography (Si—PCC, gradient 0-10% MeOH in DCM) and then triturated with MeOH to afford 176 as an off-white solid (47 mg, 40%). LCMS (Method K): RT 2.75 min [M+H]+ 375.0. 1H NMR (DMSO-d6, 400 MHz): δ 12.65 (1H, s), 8.79 (1H, d, J=2.46 Hz), 8.61 (1H, s), 8.15-7.91 (4H, m), 7.71 (1H, dd, J=8.80, 4.84 Hz), 7.55-7.46 (1H, m), 7.11 (1H, td, J=9.33, 2.43 Hz), 6.93 (1H, dd, J=8.91, 2.44 Hz), 5.49 (1H, s), 1.62 (3H, d, J=6.83 Hz)
