反应详情

温度

-70 °C

The benzylurethane from Reference Example 3 (5.54 g, 12.76 mmol ) in 50 ml dry THF was cooled to −70° C. under nitrogen and 8.80 ml of 1.6M nBuLi in hexanes (14.08 mmol ) added dropwise at the same temperature. After 20 minutes at the same temperature a solution of (R)-glycidyl butyrate (2.00 g, 13.88 mmol in 5 ml THF) was added dropwise and the mixture stirred for 30 minutes at −70° C., and then stirred to ambient temperature overnight. After quenching with 100 ml 10% ammonium chloride, the mixture was extracted with EtOAc and usual work-up to give an oily solid, which was purified by flash chromatography (Merck C60 silica, 5% MeOH/dichloromethane eluant) to give a crystalline solid (4.40 g, 86%). MS: ESP+ (M+H)=401.

1. customwas cooled to −70° C. under nitrogen
2. stirringstirred to ambient temperature overnight
3. customAfter quenching with 100 ml 10% ammonium chloride
4. extractionthe mixture was extracted with EtOAc and usual work-up
5. customto give an oily solid, which
6. customwas purified by flash chromatography (Merck C60 silica, 5% MeOH/dichloromethane eluant)