反应详情

BOP (60.2 mg, 0.136 mmol) was added to a solution of 6-((trans)-4-aminocyclohexylamino)-N-(2-chloropyridin-4-yl)-8-(cyclopropylamino)imidazo[1,2-b]pyridazine-3-carboxamide (20.00 mg, 0.045 mmol), DIEA (0.032 mL, 0.181 mmol) and 2-cyanoacetic acid (7.72 mg, 0.091 mmol) in DCM (1 mL). The clear reaction mixture was stirred at room temperature for 30 min, concentrated and diluted with MeOH and purified by HPLC (Phenomenex Axia Luna 5 micron 30×100 mm) 20% B (Solvent B=90% MeOH-10% H2O-0.1% TFA) to 100% B in A (Solvent A=10% MeOH-90% H2O-0.1% TFA) to isolate N-(2-chloropyridin-4-yl)-6-((trans)-4-(2-cyanoacetamido)cyclohexylamino)-8-(cyclopropylamino)imidazo[1,2-b]pyridazine-3-carboxamide (11 mg, 0.022 mmol, 47.7% yield) as white solid. LC/MS (Phenomenex Luna 5 micron C18 4.6×30 mm, 0 to 100 B in 2 min with 1 min hold time, Flow rate=5 mL/min, detection at 254 nm, Solvent A: 10% methanol/90% water/0.1% TFA; Solvent B: 10% water/90% methanol/0.1% TFA). Rt=1.772 minutes. [M+H]=508.11. 1H NMR (400 MHz, MeOD) δ ppm 8.24-8.39 (1H, m), 7.95-8.03 (1H, m), 7.87-7.97 (1H, m), 7.51-7.67 (1H, m), 5.98-6.11 (1H, m), 3.60-3.83 (2H, m), 2.47-2.66 (1H, m), 2.19-2.37 (2H, m), 1.96-2.19 (2H, m), 1.28-1.55 (4H, m), 0.77-0.96 (2H, m), 0.52-0.75 (2H, m).

1. concentrationconcentrated
2. additiondiluted with MeOH
3. custompurified by HPLC (Phenomenex Axia Luna 5 micron 30×100 mm) 20% B (Solvent B=90% MeOH-10% H2O-0.1% TFA) to 100% B in A (Solvent A=10% MeOH-90% H2O-0.1% TFA)