Ethyl 4,6-dichloropyridazine-3-carboxylate → ethyl 4-(6-(1H-pyrazol-1-yl)pyridin-2-ylamino)-6-chloropyridazine-3-carboxylate

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A solution of ethyl 4,6-dichloropyridazine-3-carboxylate (230 mg, 1.04 mmol) and 6-(1H-pyrazol-1-yl)pyridin-2-amine (332.3 mg, 2.07 mmol) in acetonitrile (11.8 mL) was heated at 130° C. in a sealed tube for 48 h, then cooled concentrated in vacuo and then purified by chromatography (silica, Analogix 24 g RediSep Gold column 0 to 20% acetone in dichloromethane, 20 min) to give ethyl 4-(6-(1H-pyrazol-1-yl)pyridin-2-ylamino)-6-chloropyridazine-3-carboxylate (107 mg, 258 μmol, 25%) as a white solid. This material was 83% pure and was used directly in the next step without further purification. MS (EI/CI) m/z: 345.1 [M+H].

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