Potassium Carbonate → N-(4-(difluoromethoxy)phenyl)-6-vinylpyridazin-3-amine

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To a solution of 6-chloro-N-(4-(difluoromethoxy)phenyl)pyridazin-3-amine (0.2 g, 0.736 mmol) in dioxane and water mixture were added vinylboronic acid pinacol ester (0.146 mL, 1.104 mmol), and K2CO3 (0.305 g, 2.209 mmol). The mixture was flushed for 15 min with nitrogen. PdCl2 (dppf)-CH2Cl2 adduct (0.060 g, 0.074 mmol) was then added and the reaction mixture heated at 80° C. for 18 h. The reaction mixture was filtered through a pad of celite, washed with ethyl acetate and purified by flash chromatography on silica gel using ethyl acetate in hexane to give N-(4-(difluoromethoxy)phenyl)-6-vinylpyridazin-3-amine as a white solid (0.12 g, 59%). 1HNMR 400 MHz, DMSO-d6: δ ppm 5.47 (d, J=1.20 Hz, 1H), 6.06 (dd, J=0.80, 23.80 Hz, 1H), 6.84-7.38 (m, 5H), 7.75-7.82 (m, 3H), 9.42 (s, 1H).

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