反应详情

温度

140 °C

A heavy walled sealable tube was charged with ethyl 4,6-dichloropyridazine-3-carboxylate (300 mg, 1.36 mmol) and 5,6-dimethylpyridin-2-amine (249 mg, 2.04 mmol). To the mixture was added acetonitrile (8.00 mL) and the reaction mixture was heated with stirring in an oil bath at 140° C. for 20 h. After cooling to room temperature the residue was suspended in dichloromethane and purified by flash chromatography (silica 20-45 μM, 40 g, Thomson) eluting with 0 to 10% over 20 min, acetone/dichloromethane to give ethyl 6-chloro-4-(5,6-dimethylpyridin-2-ylamino)pyridazine-3-carboxylate (195 mg, 46.8%) as an off-white solid. 1H NMR (CHLOROFORM-d) δ: 10.54 (s, 1H), 9.14 (s, 1H), 7.41 (d, J=8.3 Hz, 1H), 6.70 (d, J=8.3 Hz, 1H), 4.55 (q, J=7.2 Hz, 2H), 2.50 (s, 3H), 2.26 (s, 3H), 1.50 (t, J=7.2 Hz, 3H); LC-MS 307.0 [M+H]+.

1. temperaturethe reaction mixture was heated
2. temperatureAfter cooling to room temperature the residue
3. custompurified by flash chromatography (silica 20-45 μM, 40 g, Thomson)
4. washeluting with 0 to 10% over 20 min