Hydrochloric Acid → (Rac)-2-{4-[3-(1-quinolin-6-yl-ethyl)-imidazo[1,2-b]pyridazin-6-yl]-pyrazol-1-yl}-ethanol

Participants

Reaction Steps

In a flask were introduced (rac)-6-[1-(6-{1-[2-(tetrahydro-pyran-2-yloxy)-ethyl]-1H-pyrazol-4-yl}-imidazo[1,2-b]pyridazin-3-yl)-ethyl]-quinoline (Stage 177.1, 147 mg, 0.33 mmol) and DCM (4 mL), before adding dropwise HCl in dioxane (4 N, 0.248 mL). The RM was stirred at rt for 1 h and was then blown off with nitrogen. The residue was dissolved in water/CH3CN 1:1. The solution was basified with NaHCO3 (ca. 0.5 g) before being concentrated. The white suspension was filtered and the cake was washed with water, before being dried under vacuum. The crude was dissolved in MeOH/water and purified by preparative HPLC (H2O/CH3CN/TFA 1000:0:1 to 750:250:1 in 20 min.). Collected fractions containing the product were put together and basified with NaHCO3, before being concentrated. The resulting white suspension was filtered and the cake was washed with water, before being dried under high vacuum to give the title compound as a white solid (tR 1.83 min (conditions 8), MH+=360).

Provenance & Evidence