反应详情

温度

-20 °C

28%-Sodium metholate-methanol solution (4.4 ml) was diluted with methanol (5 ml), and cooled to −20° C. A solution of (2E)-3-(2-methoxyphenyl)prop-2-enal (2.4 g) and ethyl azidoacetate (7.5 g) in methanol (8 ml) was added over 30 min, and the mixture was stirred at −10° C. for 1 hr and at room temperature for 2 hr. The reaction mixture was poured into water and extracted with ether. The extract was washed with brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (1:4) was concentrated under reduced pressure to give methyl (2Z,4E)-2-azido-5-(2-methoxyphenyl)penta-2,4-dienoate (3.6 g). A part (3.5 g) thereof was dissolved in chloroform (10 ml), zinc iodide (214 mg) was added and the mixture was stirred at room temperature for 12 hr. The reaction mixture was poured into water, and extracted with 1,2-dichloroethane. The extract was dried over anhydrous sodium sulfate and the solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (1:4) was concentrated under reduced pressure to give the object product (3.26 g).

1. extractionextracted with ether
2. washThe extract was washed with brine
3. dry with materialdried over anhydrous sodium sulfate
4. customThe solvent was evaporated under reduced pressure
5. washa fraction eluted with ethyl acetate-hexane (1:4)
6. concentrationwas concentrated under reduced pressure