(S)-6-(1-benzylpiperidin-3-ylamino)-8-(pyridin-2-ylamino)-N-(pyridin-4-yl)imidazo[1,2-b]pyridazine-3-carboxamide → (S)-6-(piperidin-3-ylamino)-8-(pyridin-2-ylamino)-N-(pyridin-4-yl)imidazo[1,2-b]pyridazine-3-carboxamide

Participants

Reaction Steps

A Parr bottle was charged with (S)-6-(1-benzylpiperidin-3-ylamino)-8-(pyridin-2-ylamino)-N-(pyridin-4-yl)imidazo[1,2-b]pyridazine-3-carboxamide 37B (0.055 g, 0.106 mmol), and dissolved in 30 mL of methanol with heating. The solution was purged with nitrogen and 200 mgs of 10% Pd/C was added. The resulting mixture was hydrogenated overnight on a Parr apparatus at 50 psi hydrogen. The mixture was filtered through celite and concentrated in vacuo. The resulting residue was dissolved in 2 mL methanol and 2 mL Solvent B (90% MeOH, 10% water, 0.1% TFA). One drop of TFA was added to the solution and the sample was split into 3 equal volumes and purified by reverse phase preparative HPLC on a Phenx Luna Axia Column 5u (21.2×100 mm) Solvent A (10% MeOH, 90% water, 0.1% TFA), Solvent B (90% MeOH, 10% water, 0.1% TFA) 20-100% solvent B gradient, 20 mL/min, 220 nM UV detection to provide (S)-6-(piperidin-3-ylamino)-8-(pyridin-2-ylamino)-N-(pyridin-4-yl)imidazo[1,2-b]pyridazine-3-carboxamide (0.0169 g, 0.022 mmol, 20.69% yield). 1H NMR (500 MHz, CD3OD) δ ppm 8.58 (2 H, m), 8.26 (1H, m), 8.19 (2H, m), 8.13 (1H, s), 8.02 (1H, s), 7.66 (1H, m), 7.08 (1H, m), 6.93 (1H, m), 4.18 (1H, m), 3.433 (1H, m), 3.27 (1H, m), 3.06 (2H, m), 2.14 (1H, m), 2.04 (1H, m), 1.86 (2H, m). LC/MS: HPLC Retention time: 2.15 min, MS: 430 (M+1) (Shimidazu LC, Waters Sunfire C-18 column (4.65×50 mm, 5 um, 0-100% Solvent B, 4 min gradient, 4 mL/min, 220 UV detection. Solvent A: 10% MeOH/90% Water/0.1% TFA, Solvent B 90% MeOH/10% Water/0.1% TFA.)

Provenance & Evidence