反应详情

温度

22 °C

To a solution of [(1S)-1-[(3aR,5S,6aR)-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]propyl]acetate (compound 6f, 4.8 g, 20 mmol), acetic acid (12.2 g, 200 mmol) and acetic anhydride (10.2 g, 100 mmol) in anhydrous DCM (100 mL) was added concentrated H2SO4 (0.5 mL) at 0° C. After being stirred at 22° C. for 3 hours, the reaction was quenched by addition of saturated NaHCO3 solution. The organic layer was separated and the aqueous phase was extracted with EtOAc. The combined organic layers were dried over Na2SO4, filtered, and concentrated in vacuo. The residue was purified by column on silica gel (eluting with 1:8 EtOAc in petroleum ether) to afford 2.3 g of [(3R,5S)-2-acetoxy-5-[(1S)-1-acetoxypropyl]tetrahydrofuran-3-yl] acetate (compound 6g) as a colourless oil.

1. customthe reaction was quenched by addition of saturated NaHCO3 solution
2. customThe organic layer was separated
3. extractionthe aqueous phase was extracted with EtOAc
4. dry with materialThe combined organic layers were dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column on silica gel (eluting with 1:8 EtOAc in petroleum ether)