反应详情

The compound (IX) (5 g, 14.11 mmol) dissolved in dry THF (15 ml) is added to 0.5M Diisoamylborohydride (127 ml) prepared in the reaction (1). Then, it is stirred for 20 hours at a room temperature. After the reaction is finished, water (3 ml) is added and then stirred for 30 minutes. The reaction mixture is cooled to 0° C., and then 30% H2O2 (15 ml) is added and 3N NaOH is added to maintain the pH 7-8. The solvent THF is vacuum concentrated, and then it is dissolved in CH2Cl2 (100 ml) and washed by water (50 ml). An organic layer is dried using anhydrous MgSO4. The solution is vacuum concentrated, and then the compound (II) (4.72 g, 93.8%, α:β=4.6:1) is isolated using flash column chromatography (toluene/EtOAc, 10:1, v/v).

1. stirringstirred for 30 minutes
2. temperatureThe reaction mixture is cooled to 0° C.
3. temperatureto maintain the pH 7-8
4. concentrationconcentrated
5. dissolutionit is dissolved in CH2Cl2 (100 ml)
6. washwashed by water (50 ml)
7. customAn organic layer is dried
8. concentrationconcentrated