反应详情

To a mixture of Example 1A (505 mg, 3.31 mmol), 1,4-dibromobenzene (2.34 g, 9.92 mmol.), K2CO3 (960 mg, 6.87 mmol) and pyridine (20 mL) at 80° C. was added Cu(II) oxide (650 mg, 8.17 mmol). After the addition, the mixture was refluxed vigorously for 20 h. After cooling, methylene chloride was added and the mixture was filtered through Celite. The filtrate was concentrated to dryness. The residue was dissolved in ether, which was washed with 10% HCl (2×), 1N NaOH (2×), brine (1×), dried over MgSO4, and concentrated to dryness. The residue was purified on silica gel eluting with hexane and ethyl acetate gradient to give the desired product as a white solid (477 mg, 47%).

1. additionAfter the addition
2. temperaturethe mixture was refluxed vigorously for 20 h
3. temperatureAfter cooling
4. filtrationthe mixture was filtered through Celite
5. concentrationThe filtrate was concentrated to dryness
6. dissolutionThe residue was dissolved in ether
7. washwhich was washed with 10% HCl (2×), 1N NaOH (2×), brine (1×)
8. dry with materialdried over MgSO4
9. concentrationconcentrated to dryness
10. customThe residue was purified on silica gel eluting with hexane and ethyl acetate gradient