反应详情

Furan (4.0 ml, 55.0 mmol) and magnesium iodide (1.00 g, 3.6 mmol) are added to a solution of 2-(5-bromo-2-ethylphenyl)cyclopent-4-ene-1,3-dione (5.0 g, 17.9 mmol) in dichloromethane (20 ml) and the mixture is stirred at room temperature for 3 days. A further quantity of furan (1.3 ml, 17.8 mmol) is added and stirring continued for 18 hours, and then a further quantity of furan (1.3 ml, 17.8 mmol) is added and the mixture is stirred for 48 hours, and then allowed to stand at room temperature for 5 days. The reaction mixture is dissolved in methanol and concentrated under reduced pressure. The residue is purified by column chromatography on silica gel to give (1RS,2SR,6RS,7SR)-4-(5-bromo-2-ethylphenyl)-10-oxatricyclo[5.2.1.02,6]dec-8-en-3,5-dione.

1. stirringstirring
2. waitcontinued for 18 hours
3. stirringthe mixture is stirred for 48 hours
4. waitto stand at room temperature for 5 days
5. concentrationconcentrated under reduced pressure
6. customThe residue is purified by column chromatography on silica gel