反应详情

A solution of Example 4A (4.405 mmol) in 1:1 ethyl acetate/ethanol (50 mL) was treated with Wilkinson's catalyst (815 mg, 0.880 mmol), degassed three times by freeze-thaw cycle, heated to reflux under nitrogen atmosphere for 2 days, and cooled to room temperature. The solution was adsorbed onto silica gel and purified by flash column chromatography with 50% ethyl acetate in hexane to provide the desired product (1.024 g, 78%). 1H NMR (300 MHz, CD3OD) δ 7.40 (2H, d), 7.10 (2H, d), 3.62 (4H, m), 3.57 (2H, t), 3.38 (2H, t), 2.94 (2H, t), 2.58 (2H, t).

1. customdegassed three times by freeze-thaw cycle
2. temperatureheated
3. temperatureto reflux under nitrogen atmosphere for 2 days
4. custompurified by flash column chromatography with 50% ethyl acetate in hexane