反应详情

1,3-Dimethoxy-2-propylbenzene (0.90 g, 5.0 mmol), glacial acetic acid (150 ml), and 48% aqueous hydrobromic acid (15 ml, 133 mmol) were combined and stirred at reflux temperature for three days. The mixture was allowed to cool to room temperature; poured into water (500 ml), and the aqueous solution extracted with ether (500 ml, 2×). The ether layers were combined, washed with brine, dried over magnesium sulfate, filtered and taken to dryness in vacuo. Flash chromatography as in Example 10 (plus an additional step of 5% ethyl acetate in hexane) yielded the title product: n.m.r.: δ12.97 (s, 1H), 7.52 (d, 1H), 6.38 (d, 1H), 5.79 (s, 1H), 2.63 (t, 2H), 2.56 (s, 3H), 1.58 (m, 2H), 0.98 (t, 3H).

1. temperatureat reflux temperature for three days
2. extractionthe aqueous solution extracted with ether (500 ml, 2×)
3. washwashed with brine
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered