Ionic Liquid-coordinated Ytterbium(III) Sulfonate Catalyzed Michael Addition of Indoles to Electron-deficient Nitroolefins
作者:Wei Shen、Limin Wang、Jun Tang、Zhenhua Qian、Xiaofeng Tong
DOI:10.1002/cjoc.201090094
日期:2010.1
The Michael addition of indoles to electron‐deficient nitroolefins was effectively catalyzed by an ionic liquid‐coordinated ytterbium(III) sulfonate catalyst. The recycling procedure of the catalyst was very simple without extraction with water, and the catalyst was reused for five times without any loss of its catalytic activity. Furthermore, to demonstrate the application of this methodology, the
离子液体配位的tter(III)磺酸盐催化剂有效地催化了吲哚向缺电子的硝基烯烃的迈克尔加成反应。催化剂的再循环过程非常简单,无需用水萃取,并且催化剂可重复使用五次而不会损失其催化活性。此外,为证明该方法的应用,选择了Pictet-Spengler反应并成功地在Br?nsted-酸性离子液体和[bmim] BF 4的混合物中进行了该反应。