3,6-Dichloropyridazine → 6-(1-{6-Chloro-[1,2,4]triazolo[4,3-b]pyridazin-3-yl}ethyl)-5,7-difluoroquinoline

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Reaction Steps

A solution of 2-(5,7-difluoro-quinolin-6-yl)-propionic acid hydrazide (2.404 g, 9.404 mmol) and 3,6-dichloropyridazine (2.138 g, 14.35 mmol) in butan-1-ol (60 mL) was stirred at 135° C. in a sealed tube overnight. Solvent was removed under reduced pressure, and the residue was purified by column chromatography to afford 1.476 g (45% for two steps) of the title compound as a pale yellow solid. 1H-NMR (400 MHz, DMSO-d6) δ ppm 8.93 (dd, 1H), 8.36 (dd, 1H), 8.07 (d, 1H), 7.62 (dd, 1H), 7.43 (dd, 1H), 7.05 (d, 1H), 5.26 (q, 1H), 2.13 (d, 1H). LCMS (method A): [MH]+=346, tR=5.00 min.

Provenance & Evidence