反应详情

温度

70 °C

6-((trans)-4-aminocyclohexylamino)-8-(cyclopropyl(4-methoxybenzyl)amino)-N-(2-fluoropyridin-4-yl)imidazo[1,2-b]pyridazine-3-carboxamide (25B) was dissolved in TFA (2 mL) and heated at 70° C. for 2 hrs. The reaction mixture was concentrated 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 afford 6-((trans)-4-aminocyclohexylamino)-8-(cyclopropylamino)-N-(2-fluoropyridin-4-yl)imidazo[1,2-b]pyridazine-3-carboxamide (23 mg, 43.2% yield) as a 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=1.448 minutes. [M+H]=425.29. 1H NMR (400 MHz, MeOD) δ ppm 8.08-8.26 (1H, m), 8.04 (1H, s), 7.60-7.74 (1H, m), 7.29-7.45 (1H, m), 5.99-6.16 (1H, m), 3.61-3.92 (1H, m), 3.08-3.28 (1H, m), 2.48-2.69 (1H, m), 2.26-2.48 (2H, m), 2.07-2.28 (2H, m), 1.37-1.69 (4H, m), 0.79-1.00 (2H, m), 0.53-0.76 (2H, m).

1. concentrationThe reaction mixture was concentrated
2. 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)