反应详情

温度

80 °C

A round-bottomed flask was charged with tert-butyl 4-(2,6-dichloro-4-pyridyl)piperidine-1-carboxylate (3.64 g, 11.0 mmol), 2-amino-4-cyanopyridine (1.35 g, 11.0 mmol), tris(dibenzylideneacetone)dipalladium(0) (259 mg, 2.5 mol %), 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (328 mg, 5 mol %) and potassium carbonate (2.13 g, 15.4 mmol). The flask was sealed with a septum and purged with nitrogen gas before injecting anhydrous 1,4-dioxane (22 mL, 0.5 M). The reaction mixture was stirred at 80° C. for 17 hr before cooling to rt and filtering through Celite, rinsing with CH2Cl2. After concentration, flash column chromatography (100:0-60:40 heptanes/EtOAc) afforded tert-butyl 4-[2-chloro-6-[(4-cyano-2-pyridyl)amino]-4-pyridyl]piperidine-1-carboxylate as a colorless film (1.745 g, 38%); 1H NMR (400 MHz, CDCl3) δ 8.40 (d, J=5.1 Hz, 1H), 7.94 (s, 1H), 7.42 (br s, 1H), 7.17 (s, 1H), 7.08 (d, J=5.1 Hz, 1H), 6.81 (s, 1H), 4.41-4.09 (m, 2H), 2.87-2.72 (m, 2H), 2.71-2.60 (m, 1H), 1.88-1.80 (m, 2H), 1.67-1.58 (m, 2H), 1.49 (s, 9H).

1. customThe flask was sealed with a septum
2. custompurged with nitrogen gas
3. temperaturebefore cooling to rt
4. filtrationfiltering through Celite
5. washrinsing with CH2Cl2
6. concentrationAfter concentration, flash column chromatography (100:0-60:40 heptanes/EtOAc)