反应详情

A solution of 10.6 g of 5,6-difluoro-1-indanone, 13.1 ml of 3-buten-2-ol and 110 mg of p-toluenesulfonic acid in 110 ml of 2,2-dimethoxy-propane was boiled under reflux for 64 hours on a water separator filled with molecular sieve (0.4 nm, 2 mm pearl shaped). The reaction mixture was subsequently concentrated in a vacuum and purified by column chromatography on silica gel (hexane/diethyl ether 2:1). In addition to 3.6 g of educt there were obtained 5.32 g (38%) of (RS)-2-(2-buten-1-yl)-5,6-difluoro-1-indanone as a brown oil.

1. additionseparator filled with molecular sieve (0.4 nm, 2 mm pearl shaped)
2. concentrationThe reaction mixture was subsequently concentrated in a vacuum
3. custompurified by column chromatography on silica gel (hexane/diethyl ether 2:1)
4. additionIn addition to 3.6 g of educt