反应详情

A solution of 2-(4-bromophenyl)ethanol (40.0 g, 0.199 mol) in dichloromethane (10 mL) was added dropwise to a solution of imidazole (22.4 mg, 0.329 mmol), triphenylphosphine (66.5 g, 0.254 mol), and iodine (65.0 g, 0.26 mol) in dichloromethane (50 mL) at 0° C. When the addition was complete it was warmed to rt. After 1 hour the reaction was filtered through celite, the filtrate was washed with saturated aqueous sodium thiosufate (2×100 mL), brine (100 mL), dried over MgSO4, filtered and concentrated in vacuo. Purification by flash column chromatography on silica gel (heptane/ethyl acetate 4:1) afforded the title compound as a yellow-white solid (59.09 g, 60%). 1HNMR (400 MHz, CHLOROFORM-d) δ ppm 3.14 (t, J=7.69 Hz, 2H) 3.33 (t, J=7.69 Hz, 2H) 7.08 (d, J=7.89 Hz, 2H) 7.45 (d, J=8.31 Hz, 2H)

1. additionWhen the addition
2. filtrationAfter 1 hour the reaction was filtered through celite
3. washthe filtrate was washed with saturated aqueous sodium thiosufate (2×100 mL), brine (100 mL)
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customPurification by flash column chromatography on silica gel (heptane/ethyl acetate 4:1)