Hydrochloric Acid → (NE)-N-[1-[3-[1-(5,7-difluoroquinolin-6-yl)ethyl]-[1,2,4]triazolo[4,3-b]pyridazin-6-yl]ethylidene]hydroxylamine

Participants

Reaction Steps

1-(3-(1-(5,7-difluoroquinolin-6-yl)ethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)ethanone (53.5, 491 mg, 1.390 mmol) in methanol (30 mL) was added hydroxylamine hydrochloride (140 mg, 2.015 mmol), followed by hydrochloride dropwise to give a pale yellow clear solution. The reaction mixture was stirred at it overnight. LCMS showed the reaction was complete. Aqueous NaOH (1N) solution was added at 0° C. until pH 8-9. Solvent was evaporated, and the residue was purified by column chromatography to afford 410 mg (88% yield) of the title compound as a white solid. 1H-NMR (400 MHz, DMSO-d6) 3 ppm 12.21 (s, 1H), 8.97 (dd, 1H), 8.45 (d, 1H), 8.22 (d, 1H), 7.57-7.71 (m, 3H), 5.25 (q, 1H), 2.01 (d, 3H), 1.84 (s, 3H). LCMS (method A): [MH]+=369, tR=5.45 min.

Provenance & Evidence