反应详情

Ethyl 2-chloro-4-(4-fluorophenyl)-5-oxazolebutanoate (3.11 g), 2-methylimidazole (2.46 g), potassium carbonate (4.15 g) and N,N-dimethylformamide (25 ml) was stirred at 120-130° C. for 2 hours. The reaction mixture was poured into water (100 ml) and extracted with ethyl acetate (150 ml×2). The organic layer was dried over anhydrous magnesium sulfate. The organic layer was concentrated, the residue was subjected to silica gel column chromatography, and ethyl 4-(4-fluorophenyl)-2-(2-methyl-1-imidazolyl)-5-oxazolebutanoate was obtained as an oil (3.47 g, 57%) from an ethyl acetate-hexane (1:1, v/v)-eluted fraction. Conversion to the hydrochloride and the subsequent recrystallization from hexane-ethylacetate gave pale yellow prisms. Melting point 140-145° C.

1. extractionextracted with ethyl acetate (150 ml×2)
2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
3. concentrationThe organic layer was concentrated