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Hydrogenation of Quinolines Using a Recyclable Phosphine‐Free Chiral Cationic Ruthenium Catalyst: Enhancement of Catalyst Stability and Selectivity in an Ionic Liquid
Author(s) -
Zhou Haifeng,
Li Zhiwei,
Wang Zhijian,
Wang Tianli,
Xu Lijin,
He Yanmei,
Fan QingHua,
Pan Jie,
Gu Lianquan,
Chan Albert S. C.
Publication year - 2008
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200802237
Subject(s) - ionic liquid , catalysis , selectivity , cationic polymerization , phosphine , ruthenium , chemistry , reactivity (psychology) , organic chemistry , combinatorial chemistry , medicine , alternative medicine , pathology
Liquid assets : The catalyst ( S , S )‐ 1 exhibits an unprecedented reactivity and excellent enantioselectivity for the title reaction when it is carried out in neat ionic liquid (see scheme; BMIM=1‐ n ‐butyl‐3‐methylimidazolium, Tf=trifluoromethanesulfonyl, Ts=4‐toluenesulfonyl). The ionic liquid facilitates the catalyst recycling and enhances its stability and selectivity.