General procedure to EXAMPLES 37 and 38: A DMF solution (2 mL) of acid trans-4-[8-amino-1-(3-benzyloxy-phenyl)-imidazo[1,5-a]pyrazin-3-yl]-cyclohexanecarboxylic acid (100 mg, 0.23 mmol) and methylamine hydrochloride (153 mg, 2.26 mmol) in a sealed tube was charged with DIEA (394 μL, 2.26 mmol), 0.6 M HOAt in DMF (377 μL, 0.23 mmol), and then EDC (65 mg, 0.34 mmol). The reaction mixture stirred at rt for 16 h. The reaction mixture was concentrated to solids, taken up in CH2Cl2, charged with silica, and concentrated to brown solids. The crude material was purified by silica gel column chromatography [Jones Flashmaster, 20 g/70 mL cartridge, eluting with 2% ˜7 N NH3 in MeOH/CH2Cl2 to 5% ˜7 N NH3 in MeOH/CH2Cl2] to afford trans-4-[8-amino-1-(3-benzyloxy-phenyl)-imidazo[1,5-a]pyrazin-3-yl]-cyclohexanecarboxylic acid methylamide as an off-white solid (60 mg, 57%).
