反应详情

To a solution of [(1S)-1-[(2S,4R)-5-hydroxy-4-methyl-tetrahydrofuran-2-yl]propyl] benzoate (compound 28i, crude, 1.2 g, 4.5 mmol) in pyridine (60 mL) was added acetic acid anhydride (0.918 g, 9 mmol) and DMAP (200 mg) with stirring. After being stirred 25° C. for 2 hours, the mixture was quenched with saturated NaHCO3 solution and extracted with EtOAc (40 mL). The organic layers were combined, washed with brine (50 mL), dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica gel (eluting with 1:20 to 1:5 EtOAc in petroleum ether) to afford 1.0 g of [(1S)-1-[(2S,4R)-5-acetoxy-4-methyl-tetrahydrofuran-2-yl]propyl] benzoate (compound 28j) as a colourless oil.

1. stirringAfter being stirred 25° C. for 2 hours
2. customthe mixture was quenched with saturated NaHCO3 solution
3. extractionextracted with EtOAc (40 mL)
4. washwashed with brine (50 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated in vacuo
7. customThe residue was purified by column chromatography on silica gel (eluting with 1:20 to 1:5 EtOAc in petroleum ether)