反应详情

1 g of phenyl acetylene and 1.48 g of ethyl 2-chloro-2-hydroxyiminoacetate were dissolved in 20 ml chloroform, and 1.4 g of potassium carbonate was added thereto, and the mixture was stirred at room temperature for 16 hours. Water and aqueous ammonium chloride solution were added to the reaction solution, followed by extracting with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate and evaporated. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=9:1), to give 1.2 g of ethyl 5-phenyl-4-isoxazole carboxylate.

1. extractionby extracting with ethyl acetate
2. washThe organic layer was washed with brine
3. dry with materialdried over anhydrous magnesium sulfate
4. customevaporated
5. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=9:1)