反应详情

Methyl 3,4,5-trihydroxybenzoate (16) (55.24 g, 0.3 mol), benzyl chloride (113.93 g, 0.9 mol), dry potassium carbonate (124.39 g, 0.9 mol) and potassium iodide (catalytic amount) were stirred in refluxing dry acetone (600 mL) for 12 h. After cooling, the acetone was evaporated, and the solution was dissolved in water (250 mL). The water phase was extracted with diethyl ether (4×100 mL), the organic phase was washed with brine (2×50 mL), dried (MgSO4) and the solvent was removed in vacuo. Recrystallisation from petroleum ether and ethyl acetate gave the titled compound as white crystals, m.p. 102-103° C. Yield: 121.4 g (89%). Spectroscopic data were in accordance with the literature (J. Barbera, R. Iglesias, J. L. Serrano, T. Sierra, M. R. de la Fuente, B. Palacios, M. A. Perez-Jubindo, J. T. Vazquez, J. Am. Chem. Soc. 1998, 120, 2908).

1. temperatureAfter cooling
2. customthe acetone was evaporated
3. dissolutionthe solution was dissolved in water (250 mL)
4. extractionThe water phase was extracted with diethyl ether (4×100 mL)
5. washthe organic phase was washed with brine (2×50 mL)
6. dry with materialdried (MgSO4)
7. customthe solvent was removed in vacuo
8. customRecrystallisation from petroleum ether and ethyl acetate