反应详情

温度

100 °C

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and nitrogen inlet was charged with 102g (548 mg, 1.18 mmol), 102f (215 mg, 0.848 mmol), sodium carbonate (306 mg, 2.88 mmol), DMF (2 mL), water (2 mL) and 1,4-dioxane (10 mL). After bubbling nitrogen through the resulting suspension for 30 min, tetrakis(triphenylphosphine)palladium(0) (222 mg, 0.192 mmol) was added. A reflux condenser was attached to the flask, and the reaction mixture was heated at 100° C. for 14 h. After this time, the mixture was diluted with 90:10 methylene chloride/methanol (100 mL) and water (75 mL), and the layers were separated. The aqueous layer was extracted with 90:10 methylene chloride/methanol (2×30 mL), and the combined organic layers were washed with brine (100 mL) and dried over sodium sulfate. The drying agent was removed by filtration. The filtrate was concentrated under reduced pressure, and the resulting residue was dissolved in THF (5 mL), water (5 mL) and methanol (5 mL). Lithium hydroxide monohydrate (202 mg, 4.81 mmol) was added, and the mixture was stirred at room temperature for 2 h. After this time, the mixture was diluted with 90:10 methylene chloride/methanol (150 mL) and water (100 mL), and the layers were separated. The aqueous layer was extracted with 90:10 methylene chloride/methanol (2×100 mL), and the combined organic layers were washed with brine (100 mL) and dried over sodium sulfate. The drying agent was removed by filtration. The filtrate was concentrated under reduced pressure, and the resulting residue was purified by flash column chromatography (silica, 90:10 methylene chloride/methanol) to afford 102 in 31% yield (136 mg) as an amorphous white solid: mp 174-176° C.; 1H NMR (500 MHz, DMSO-d6) δ 9.18 (s, 1H), 7.92 (s, 1H), 7.73 (d, J=8.0 Hz, 2H), 7.62-7.60 (m, 2H), 7.52 (t, J=3.0 Hz, 1H), 7.51 (s, 1H), 7.46-7.44 (m, 1H), 6.19 (d, J=2.5 Hz, 1H), 4.92 (s, 2H), 4.66 (t, J=5.5 Hz, 1H), 4.43 (d, J=5.5 Hz, 2H), 4.04 (q, J=7.0 Hz, 2H), 3.76 (s, 3H), 1.36 (s, 9H), 1.33 (t, J=7.0 Hz, 3H); MS (ESI+) m/z 513.3 (M+H).

1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and nitrogen inlet
2. customAfter bubbling nitrogen through the resulting suspension for 30 min
3. customA reflux condenser was attached to the flask
4. customthe layers were separated
5. extractionThe aqueous layer was extracted with 90:10 methylene chloride/methanol (2×30 mL)
6. washthe combined organic layers were washed with brine (100 mL)
7. dry with materialdried over sodium sulfate
8. customThe drying agent was removed by filtration
9. concentrationThe filtrate was concentrated under reduced pressure
10. dissolutionthe resulting residue was dissolved in THF (5 mL)
11. customthe layers were separated
12. extractionThe aqueous layer was extracted with 90:10 methylene chloride/methanol (2×100 mL)
13. washthe combined organic layers were washed with brine (100 mL)
14. dry with materialdried over sodium sulfate
15. customThe drying agent was removed by filtration
16. concentrationThe filtrate was concentrated under reduced pressure
17. customthe resulting residue was purified by flash column chromatography (silica, 90:10 methylene chloride/methanol)