反应详情

A mixture of 1.25 g (5 mmol) of 3-benzyloxy-4-hydroxy-5-(2-hydroxyethyl)-2(5H)-furanone, 15 mL of THF, 871 μL (5.0 mmol) of diisopropylethylamine and 631 μL (5.2 mmol) of benzyl bromide were combined under argon. The reaction mixture was warmed to reflux for 5 hours, and upon cooling, a suspension formed which was poured into 50 mL of 5% aqueous HCl solution and extracted with 100 mL of ether. The ether fraction was separated and sequentially washed with 30 mL of 5% aqueous HCl, 30 mL of H2O, 30 mL of saturated NaHCO3 solution, 30 mL of H2O, 30 mL of brine, dried (MgSO4) and concentrated to a colorless oil. Purification over silica gel using EtOAc/hexanes (2/3) provided 3,4-dibenzyloxy-5-(2-hydroxyethyl)-2(5H)-furanone as a faint pink colored oil (1.0 g, 60% yield).

1. temperatureThe reaction mixture was warmed
2. temperatureto reflux for 5 hours
3. temperatureupon cooling
4. customa suspension formed which
5. extractionextracted with 100 mL of ether
6. customThe ether fraction was separated
7. washsequentially washed with 30 mL of 5% aqueous HCl, 30 mL of H2O, 30 mL of saturated NaHCO3 solution, 30 mL of H2O, 30 mL of brine
8. dry with materialdried (MgSO4)
9. concentrationconcentrated to a colorless oil
10. customPurification over silica gel