反应详情

A 100-mL two-neck round-bottomed flask equipped with a reflux condenser, magnetic stirrer and nitrogen inlet was charged with 270b (1.00 g, 5.20 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (1.53 g, 5.72 mmol), cesium carbonate (5.09 g, 15.6 mmol), and 1,4-dioxane (52 mL). After bubbling nitrogen through the resulting suspension for 30 min, Xantphos (257 mg, 0.442 mmol) and tris(dibenzylidene-acetone)dipalladium(0) (239 mg, 0.260 mmol) were added, and the reaction mixture was heated at reflux for 3 h. After this time, the mixture was cooled to room temperature and diluted with ethyl acetate (150 mL) and water (30 mL). The organic layer was separated, and the aqueous layer was extracted with ethyl acetate (3×150 mL). The combined organic layers were dried over sodium sulfate and concentrated under reduced pressure. The residue was triturated with methanol (20 mL) to afford a 63% yield (700 mg) of 270c as an off-white solid: mp 161-163° C.; 1H NMR (300 MHz, DMSO-d6) d 8.50 (d, 1H, J=2.3 Hz), 8.39 (s, 1H), 7.75 (d, 1H, J=2.4 Hz), 7.40 (d, 1H, J=2.4 Hz), 7.17 (m, 2H), 3.50 (s, 3H), 3.56 (t, 2H, J=6.9 Hz), 2.86 (s, 3H), 2.35 (t, 2H, J=7.1 Hz), 2.16 (s, 6H); MS (ESI+) m/z 380.1 (M+H).

1. customA 100-mL two-neck round-bottomed flask equipped with a reflux condenser, magnetic stirrer and nitrogen inlet
2. customAfter bubbling nitrogen through the resulting suspension for 30 min
3. temperaturethe reaction mixture was heated
4. temperatureat reflux for 3 h
5. customThe organic layer was separated
6. extractionthe aqueous layer was extracted with ethyl acetate (3×150 mL)
7. dry with materialThe combined organic layers were dried over sodium sulfate
8. concentrationconcentrated under reduced pressure
9. customThe residue was triturated with methanol (20 mL)