反应详情

温度

92 °C

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 1,4-dioxane (50 mL), 268b (1.1 g, 11.3 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (3.0 g, 11.3 mmol), Pd2(dba)3 (1.0 g, 1.13 mmol), XantPhos (1.3 g, 2.26 mmol), and cesium carbonate (7.3 g, 22.6 mmol). After three cycles of vacuum/argon flush, the mixture was heated at 92° C. for 4.5 hrs. It was then cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure and the resulting residue was purified by silica-gel column chromatography eluting with dichloromethane/methanol (100:1 to 50:1) to afford 268c (2.4 g, 76%) as yellow solid. MS-ESI: [M+H]+ 283.1

1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
2. customAfter three cycles of vacuum/argon flush
3. temperatureIt was then cooled to room temperature
4. filtrationfiltered
5. concentrationThe filtrate was concentrated under reduced pressure
6. customthe resulting residue was purified by silica-gel column chromatography
7. washeluting with dichloromethane/methanol (100:1 to 50:1)