反应详情

929 mg (2.77 mmol) of the compound from Example 44A are dissolved in 14 ml of anhydrous dioxane, and 64 mg (0.06 mmol) of tetrakis(triphenylphosphine)palladium(0) are added. At room temperature, 1.06 g (3.33 mmol) of tributylvinyl tin are added slowly, and, after the addition has ended, the mixture is heated at reflux for 21 h. The reaction solution is allowed to cool and is filtered through kieselguhr. The filter cake is then washed with ethyl acetate, and the combined organic filtrates are concentrated to dryness under reduced pressure. The product is purified by chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate=4:1). This gives 568 mg (70% of theory) of the desired product.

1. additionafter the addition
2. temperaturethe mixture is heated
3. temperatureat reflux for 21 h
4. temperatureto cool
5. filtrationis filtered through kieselguhr
6. washThe filter cake is then washed with ethyl acetate
7. concentrationthe combined organic filtrates are concentrated to dryness under reduced pressure
8. customThe product is purified by chromatography on silica gel (mobile phase: cyclohexane/ethyl acetate=4:1)