反应详情

3-Bromofuran (5.2 g, 56 mmol) and magnesium iodide (1.5 g, 5.6 mmol) are added to 2-(2,4,6-trimethylphenyl)cyclopent-4-ene-1,3-dione (4.0 g, 18.7 mmol) and the mixture is stirred at room temperature for 2 days; small quantities of dichloromethane are added when required to aid stirring. The reaction mixture is allowed to stand at room temperature for 17 hours, then concentrated under reduced pressure. The residue is purified by column chromatography on silica gel to give (1RS, 2RS,6SR,7SR)-8-bromo-4-(2,4,6-trimethylphenyl)-10-oxatricyclo-[5.2.1.02,6]dec-8-en-3,5-dione.

1. stirringto aid stirring
2. waitto stand at room temperature for 17 hours
3. concentrationconcentrated under reduced pressure
4. customThe residue is purified by column chromatography on silica gel