反应详情

A mixture of Dess-Martin periodinane (0.931 g, 2.20 mmol) and the product of example 35A (0.561 g, 2.00 mmol) was stirred in CH2Cl2 (10 mL) for 1 hour, diluted with EtOAc, washed with saturated aqueous NaHCO3 and brine, dried (Na2SO4), filtered, and concentrated. The residue was chromatographed on SiO2 (eluted with 4% Et2O/hexanes) to give 515.6 mg of the title compound as a clear gum. 1H NMR (300 MHz, DMSO) δ 7.81 (dd, 1H), 7.69-7.76 (m, 3H), 7.54-7.61 (m, 2H), 7.50 (dd, 1H), 7.39 (ddd, 1H).

1. washwashed with saturated aqueous NaHCO3 and brine
2. dry with materialdried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated
5. customThe residue was chromatographed on SiO2 (eluted with 4% Et2O/hexanes)