反应详情

2-Bromomethyl-1,3-dioxolane (8.3 ml, 80 mmol), ethyl-3-hydroxy-benzoate (3.32 g, 20 mmol), potassium carbonate (5.53 g, 40 mmol) and sodium iodide (1.2 g, 8 mmol) were heated at 120° C. in DMF (8 ml) for 17 hrs. The reaction was cooled to room temperature and all the solvents were evaporated under reduced pressure. The residues were partitioned between DCM (250 ml) and water (250 ml). The DCM layer was separated and the aqueous layer was back-extracted with DCM (2×100 ml). All the DCM extracts were combined, dried over MgSO4 and evaporated under reduced pressure. The residue was purified by column chromatography (4×25 cm). The product was eluted with 20% petroleum ether (60-80° C.) in DCM and the title compound was obtained as a slightly brown oil (4.63 g, 91.8%). APCI-MS, m/z 252.95 (M+1).

1. customall the solvents were evaporated under reduced pressure
2. customThe residues were partitioned between DCM (250 ml) and water (250 ml)
3. customThe DCM layer was separated
4. extractionthe aqueous layer was back-extracted with DCM (2×100 ml)
5. dry with materialdried over MgSO4
6. customevaporated under reduced pressure
7. customThe residue was purified by column chromatography (4×25 cm)
8. washThe product was eluted with 20% petroleum ether (60-80° C.) in DCM