反应详情

温度

100 °C

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 232c (1.5 g, 7.9 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (2.0 g, 7.9 mmol), cesium carbonate (5.0 g, 16 mmol), and 1,4-dioxane (50 mL). After bubbling nitrogen through the resulting suspension for 30 minutes, XantPhos (455 mg, 0.79 mmol) and tris(dibenzylideneacetone)dipalladium(0) (718 mg, 0.79 mmol) were added. The system was subject to three cycles of vacuum/argon flush and heated at 100° C. for 2 h. After this time the reaction was cooled to room temperature and filtered. The filtrate was partitioned between ethyl acetate (100 mL) and water (100 mL). The aqueous layer was separated and extracted with ethyl acetate (3×50 mL). The combined organic layer was washed with brine (3×20 mL) and dried over sodium sulfate. The drying agent was removed by filtration and the filtrate was concentrated under reduced pressure. The residue was purified by silica-gel column chromatography eluting with 1:3 ethyl acetate/petroleum ether to afford 232d as a brown solid (1.5 g, 50%). MS-ESI: [M+H]+ 377.

1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
2. customAfter bubbling nitrogen through the resulting suspension for 30 minutes
3. customflush
4. temperatureAfter this time the reaction was cooled to room temperature
5. filtrationfiltered
6. customThe filtrate was partitioned between ethyl acetate (100 mL) and water (100 mL)
7. customThe aqueous layer was separated
8. extractionextracted with ethyl acetate (3×50 mL)
9. washThe combined organic layer was washed with brine (3×20 mL)
10. dry with materialdried over sodium sulfate
11. customThe drying agent was removed by filtration
12. concentrationthe filtrate was concentrated under reduced pressure
13. customThe residue was purified by silica-gel column chromatography
14. washeluting with 1:3 ethyl acetate/petroleum ether