反应详情

To a stirred solution of [(1S)-1-[(3aR,5S,6aR)-2,2-dimethyl-3a,5,6,6a-tetrahydrofuro[2,3-d][1,3]dioxol-5-yl]propyl] 2-methylpropanoate (compound 42a, 470 mg, 1.73 mmol), acetic anhydride (0.81 mL, 8.64 mmol) and acetic acid (0.51 mL, 8.64 mmol) in DCM (10 mL) was added concentrated sulfuric acid (18.4 μL, 0.17 mmol). The resulting mixture was stirred at room temperature overnight. The resulting mixture was concentrated in vacuo. The residue was purified by column chromatography on silica gel (eluting with 0-20% EtOAc in petroleum ether) to afford 105 mg of [(1S)-1-[(2S,4R,5R)-4,5-diacetoxytetrahydrofuran-2-yl]propyl] 2-methylpropanoate (compound 42b).

1. concentrationThe resulting mixture was concentrated in vacuo
2. customThe residue was purified by column chromatography on silica gel (eluting with 0-20% EtOAc in petroleum ether)