反应详情

温度

0 °C

A solution of N,N-dicyclohexylcarbodiimide (0.22 g, 1.1 mmol) in dichloromethane (10 cm3) is added to a solution of (E)-hex-2-enoic acid (0.10 g, 0.9 mmol), 1-[4-(trans-4-hydroxycyclohexyl) phenyl]-4-pentylbicyclo[2.2.2]octane (0.32 g, 0.9 mmol), 4-(dimethylamino) pyridine (0.04 g) in dichloromethane (20 cm3), cooled in an ice bath (0° C.) under an atmosphere of nitrogen. The reaction mixture is stirred overnight, filtered to remove precipitated material and the filtrate is evaporated down under reduced pressure. The crude product is purified by column chromatography on silica gel using a 9:1 petroleum ether (40-60° C.)/ethyl acetate mixture as eluent, followed by recrystallization from ethanol to yield the desired ester (0.26 g, 64%).

1. filtrationfiltered
2. customto remove
3. customprecipitated material
4. customthe filtrate is evaporated down under reduced pressure
5. customThe crude product is purified by column chromatography on silica gel using a 9:1 petroleum ether (40-60° C.)/ethyl acetate mixture as eluent
6. customfollowed by recrystallization from ethanol