反应详情

温度

50 °C

Perchloric acid (4.96 ml, 57.4 mmol) was added to a solution of 3 (56.02 g, 287 mmol) in dioxane (1124 ml) and H2O (856 ml) and the reaction mixture was stirred at 50° C. overnight. The reaction mixture was concentrated to half its volume and aqueous saturated NaHCO3 was added. The H2O layer was extracted with CH2Cl2 (2×) and the combined organic layer was washed with brine, dried (Na2SO4) and concentrated. Purification by column chromatography (silica, heptane/EtOAc, 2:3->1:2) yielded 4 (47.45 g, 78%).

1. concentrationThe reaction mixture was concentrated to half its volume and aqueous saturated NaHCO3
2. additionwas added
3. extractionThe H2O layer was extracted with CH2Cl2 (2×)
4. washthe combined organic layer was washed with brine
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated
7. customPurification by column chromatography (silica, heptane/EtOAc, 2:3->1:2)