反应详情

温度

-78 °C

To a −78° C. stirred solution of 4-hydroxy-5,5-dimethyl-5H-furan-2-one (250 mg, 1.95 mmol) in 18 mL of anhydrous CH2Cl2, was added triethylamine (0.40 mL, 2.9 mmol) and Tf2O (0.49 mL, 2.9 mmol). The reaction was stirred at −78° C. for 30 minutes, and quenched with saturated NH4Cl solution (10 mL). The mixture was warmed up to room temperature and separated. The aqueous layer was extracted with CH2Cl2 (2×20 mL). All organic layers were combined, dried over Na2SO4 and evaporated to brown oil, which was purified by plugging through a short pad of silica gel column with EtOAc/hexanes (1/3). Evaporation of solvents gave 2,2-dimethyl-5-oxo-2,5-dihydrofuran-3-yl trifluoromethanesulfonate as a light brown oil (450 mg, 89%).

1. customquenched with saturated NH4Cl solution (10 mL)
2. temperatureThe mixture was warmed up to room temperature
3. customseparated
4. extractionThe aqueous layer was extracted with CH2Cl2 (2×20 mL)
5. dry with materialdried over Na2SO4
6. customevaporated to brown oil, which
7. customwas purified
8. customEvaporation of solvents