反应详情

To a solution of 4-(4-chlorophenyl)-2-oxazolepropionic acid (0.5 g) in acetonitrile (20 ml) were added 2-phenyl-2-propanol (0.325 g), dicyclohexylcarbodiimide (0.49 g) and 4-dimethylaminopyridine (0.025 g), followed by stirring for 65 hours at room temperature. 2-Phenyl-2-propanol (0.325 g), dicyclohexylcarbodiimide (0.49 g) and 4-dimethylaminopyridine (0.025 g) were further added to the reaction mixture, followed by stirring for 2 hours at 50° C. The reaction mixture was filtered to remove an insoluble substance, and the filtrate was then concentrated. The oily residue was subjected to a silica gel column chromatography. Crystals of 1-methyl-1-phenylethyl 4-(4-chlorophenyl)-2-oxazolepropionate (0.297 g, 38%) were obtained from the fraction eluted with ethyl acetate-hexane (1:4, V/V). Recrystallization from hexane gave colorless prism crystals of mp 94°-95° C.

1. stirringby stirring for 2 hours at 50° C
2. filtrationThe reaction mixture was filtered
3. customto remove an insoluble substance
4. concentrationthe filtrate was then concentrated