Triethylamine → [(E)-1-[3-[1-(7-fluoroquinolin-6-yl)ethyl]imidazo[1,2-b]pyridazin-6-yl]ethylideneamino]urea

Participants

Reaction Steps

To a solution of 1-(3-(1-(7-fluoroquinolin-6-yl)ethyl)imidazo[1,2-b]pyridazin-6-yl)ethanone (60 mg, 0.18 mmol) in methanol (10 ml) was added semicarbazide hydrochloride (40 mg, 0.36 mmol). Triethyl amine was added dropwise to adjust the pH to 5-6. The reaction mixture was stirred at room temperature overnight. The precipitate was collected by filtration and dried over vacuum pump to afford 38 mg (yield: 54%) title compound as a white solid. 1H-NMR (400 MHz, DMSO-d6) δ ppm 9.62 (s, 1H), 8.84 (d, 1H), 8.26 (d, 1H), 8.15 (d, 1H), 7.96 (d, 1H), 7.77 (m, 3H), 7.44 (q, 1H), 6.69 (b, 2H), 5.03 (t, 1H), 2.07 (s, 3H), 1.83 (d, 3H). LCMS (method A): [MH]+=392, tR=4.88 min.

Provenance & Evidence