反应详情

温度

10 °C

A mixture of benzyl 4,5-dihydroxy-2-pentenoate (4.4 g, 20 mmole), N-FMOC-L-valine (5.8 g, 17 mmole) and DMAP (0.21 g, 1.7 mmole) in 100 ml dichloromethane was cooled to about 10° C. A solution of DCC (4.2 g, 20 mmole) in 25 ml dichloromethane was added dropwise at the same temperature and the mixture was stirred overnight at room temperature. The mixture was cooled to 5° C. and the urethane was filtered. The filtrate was evaporated under reduced pressure and the product was isolated by silica gel column chromatography. Yield: 6.6 g=71%

1. temperatureThe mixture was cooled to 5° C.
2. filtrationthe urethane was filtered
3. customThe filtrate was evaporated under reduced pressure
4. customthe product was isolated by silica gel column chromatography