反应详情

A mixture of p-toluenesulfonic acid monohydrate (0.88 g, 4.64 mmol, 0.2 equiv), compound 14 (10.0 g crude, 23.22 mmol, 1.0 equiv) and toluene (200 mL) was refluxed for 1 h. After cooling to room temperature, the mixture was washed sequentially with saturated sodium bicarbonate (100 mL) and saturated brine (100 mL). The organic layer dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified on an AnaLogix (65-200 g) column, eluting with heptanes to give compound 15 (7.8 g, 81% yield for 2 steps) as a white solid.

1. temperaturewas refluxed for 1 h
2. washthe mixture was washed sequentially with saturated sodium bicarbonate (100 mL) and saturated brine (100 mL)
3. dry with materialThe organic layer dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified on an AnaLogix (65-200 g) column
7. washeluting with heptanes