反应详情

Benzylalcohol (9.7 mL, 94 mmol) was added dropwise to a suspension of NaH (4.0 g of a 60% suspension in mineral oil, 100 mmol) in THF (150 mL) at room temperature and the mixture was stirred at room temperature for 1 h before 1,3-dibromo-5-fluorobenzene (15.9 g, 62.5 mmol) was added. The reaction was stirred at room temperature for 12 h. Water was added carefully and the THF was evaporated under reduced pressure. The residue was extracted with iso-hexane (×3) and the combined organic extracts were washed with NaOH solution (1M aq), water, brine, dried (MgSO4), filtered and concentrated under reduced pressure. The residue was purified by flash column chromatography (EtOAc:petroleum ether) to give 1-benzyloxy-3,5-dibromobenzene as a colourless liquid, 14.7 g 69% yield. 1H NMR (CDCl3) δ 7.45-7.33 (m, 5H), 7.30-7.28 (m, 1H), 7.10-7.08 (m, 2H), 5.02 (s, 2H).

1. additionwas added
2. customthe THF was evaporated under reduced pressure
3. extractionThe residue was extracted with iso-hexane (×3)
4. washthe combined organic extracts were washed with NaOH solution (1M aq), water, brine
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by flash column chromatography (EtOAc:petroleum ether)