反应详情

Dess-Martin periodinane (7.37 g, 17.4 mmol) was added portion-wise to a stirred solution/suspension of alcohol II (2.64 g, 11.8 mmole) in dichloromethane (120 mL). The alcohol completely dissolved after the Dess-Martin reagent was added. The reaction mixture was stirred at ambient temperature for 30 min, and then quenched with ethanol. The reaction mixture was diluted with ether (860 mL) and washed twice with saturated aqueous sodium bicarbonate (550 mL) followed by 5% sodium thiosulfate pentahydrate. After washing with brine and drying (MgSO4), the solvent was evaporated to give a residue which was purified by chromatography on silica gel eluting with hexane/ethyl acetate (4:1). Compound V was obtained in 47% yield (1.2 g). mp: 96-98° C. MS: [M−H]− @m/z=216.1.

1. additionwas added
2. customquenched with ethanol
3. additionThe reaction mixture was diluted with ether (860 mL)
4. washwashed twice with saturated aqueous sodium bicarbonate (550 mL)
5. washAfter washing with brine
6. dry with materialdrying (MgSO4)
7. customthe solvent was evaporated
8. customto give a residue which
9. customwas purified by chromatography on silica gel eluting with hexane/ethyl acetate (4:1)