反应详情

Methyl 4-hydroxybenzoate (1.52 g, 10 mmol), 2-chloroethanol (960 mg, 12 mmol), potassium iodide (100 mg, 0.6 mmol) and cesium carbonate (4.56 g, 14 mmol) are combined with dry THF (50 mL) and the reaction mixture is stirred under reflux for 24 h. Additional chloroethanol (960 mg), cesium carbonate (4.56 g) and potassium iodide (100 mg) are added to the mixture and stirred under reflux for 24 h. The reaction mixture is cooled to room temperature and water and CH2Cl2 are added. The separated CH2Cl2 layer is dried over Na2SO4, filtered and evaporated. The crude product is purified using silica-gel column chromatography (hexane:EtOAc=3:1) to give the titled compound (862 mg, 44%). NMR (CDCl3): δ 8.02 (d, 2H, J=9.0 Hz), 6.97 (d, 2H, J=9.0 Hz), 4.17 (t, 2H, J=5.0 Hz), 4.03 (m, 2H), 3.92 (s, 3H).

1. temperatureunder reflux for 24 h
2. stirringstirred
3. temperatureunder reflux for 24 h
4. dry with materialThe separated CH2Cl2 layer is dried over Na2SO4
5. filtrationfiltered
6. customevaporated
7. customThe crude product is purified