反应详情

To a solution of [(3S,4S,5R,6S)-3,4,5-tribenzyloxy-6-[4-chloro-3-[(4-ethoxyphenyl)methyl]phenyl]-2-(hydroxymethyl)-6-methoxy-tetrahydropyran-2-yl]methanol 1i (2.49 g, 3.37 mmol) in dichloromethane (300 mL) was added p-toluenesulfonic acid monohydrate (0.32 g, 1.69 mmol) at room temperature. The mixture was stirred at room temperature for 1 hour and quenched with 30 mL of saturated aqueous sodium bicarbonate. The resulting mixture was extracted with dichloromethane (20 mL×2). The combined organic layers were washed with saturated aqueous sodium chloride (20 mL×2), dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by silica gel chromatography eluted with PE/EtOAc(v/v)=7/1 to give the title compound 1j as pale yellow oil (1.06 g, 44.5%). The compound was characterized by the following spectroscopic data: 1H NMR (400 MHz, CDCl3) δ (ppm): 7.45 (d, 1H), 7.40 (m, 12H), 7.30 (m, 3H), 7.09 (m, 2H), 6.91 (m, 2H), 6.78 (m, 2H), 4.88 (m, 3H), 4.78 (d, 1H), 4.29 (m, 2H), 4.11-3.96 (m, 6H), 3.88 (d, 1H), 3.80 (m, 2H), 3.71 (m, 2H), 1.85 (t, 1H), 1.41 (t, 3H).

1. customquenched with 30 mL of saturated aqueous sodium bicarbonate
2. extractionThe resulting mixture was extracted with dichloromethane (20 mL×2)
3. washThe combined organic layers were washed with saturated aqueous sodium chloride (20 mL×2)
4. dry with materialdried over anhydrous sodium sulfate
5. concentrationconcentrated in vacuo
6. customThe residue was purified by silica gel chromatography
7. washeluted with PE/EtOAc(v/v)=7/1