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Ionic Liquid‐coordinated Ytterbium(III) Sulfonate Catalyzed Michael Addition of Indoles to Electron‐deficient Nitroolefins
Author(s) -
Shen Wei,
Wang Limin,
Tang Jun,
Qian Zhenhua,
Tong Xiaofeng
Publication year - 2010
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090094
Subject(s) - chemistry , ionic liquid , catalysis , michael reaction , sulfonate , ytterbium , extraction (chemistry) , ionic bonding , organic chemistry , inorganic chemistry , ion , sodium , physics , optoelectronics , doping
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 Pictet‐Spengler reaction was chosen and successfully carried out in the mixture of Br?nsted‐acidic ionic liquid and [bmim]BF 4 .