N-(6-iodoimidazo[1,2-b]pyridazin-2-yl)cyclopropanecarboxamide (0.5 g, 1.52 mmol), [1,2,4]triazolo[4,3-a]pyridine-3-thiol (0.23 g, 1.52 mmol), Tris(dibenzylideneacetone)dipalladium(0) (84 mg, 0.09 mmol), 9,9-Dimethyl-4,5-bis(diphenylphosphino)xanthene (106 mg g, 0.18 mmol), and DIEA (0.531 mL, 3.05 mmol) were dissolved in DME (15.2 mL) and heated in a microwave at 120° C. for 30 min. The reaction mixture was concentrated to dryness, reconstituted in DMSO, and purified by preparative LCMS to give N-(6-([1,2,4]triazolo[4,3-a]pyridin-3-ylthio)imidazo[1,2-b]pyridazin-2-yl)cyclopropanecarboxamide (1 g, 43%) as a TFA salt. 1H NMR (400 MHz, DMSO-d6) δ=11.17 (s, 1 H), 8.57-8.44 (m, 1 H), 8.03-7.94 (m, 1 H), 7.96-7.88 (m, 2 H), 7.59 (ddd, J=1.0, 6.6, 9.3 Hz, 1 H), 7.22-7.11 (m, 1 H), 7.11-7.03 (m, 1 H), 1.97-1.84 (m, 1 H), 0.83-0.73 (m, 4 H) ESI-MS:m/z 352.3 (M+H)+. MP 193-195° C.
