反应详情

1,3-Dimethoxy-2-(n-propyl)benzene (0.90 g, 5.0 mmol), 48% aqueous hydrobromic acid (30 ml, 265 mmol), and glacial acetic acid (150 ml) were combined and stirred at reflux temperature for 72 hours. The reaction mixture was cooled to room temperature then added to water (250 ml). The aqueous mixture was extracted with ether (500 ml, 2×). The organic phases were combined, washed with brine (100 ml), dried over magnesium sulfate and concentrated in vacuo. The residue was flash chromatographed over Kieselgel 60 (230-400 mesh, 4 cm diameter×16 cm length) eluted with 1% ethyl acetate in hexane, followed by a step gradient (2%, 3%, 4%) of ethyl acetate in hexane to give 0.4 g, 41% of the title product.

1. temperatureat reflux temperature for 72 hours
2. extractionThe aqueous mixture was extracted with ether (500 ml, 2×)
3. washwashed with brine (100 ml)
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated in vacuo
6. customchromatographed over Kieselgel 60 (230-400 mesh, 4 cm diameter×16 cm length)
7. washeluted with 1% ethyl acetate in hexane