Organocatalysts wrapped around by poly(ethylene glycol)s (PEGs): a unique host-guest system for asymmetric Michael addition reactions |
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| Authors: | Xu Dan Qian Luo Shu Ping Wang Yi Feng Xia Ai Bao Yue Hua Dong Wang Li Ping Xu Zhen Yuan |
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| Affiliation: | State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang University of Technology, Hangzhou, China. |
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| Abstract: | Asymmetric Michael addition reactions of unmodified ketones to nitroalkenes were performed in PEGs catalyzed by novel pyrrolidinyl-thioimidazolium salts to give products in up to 97% yield and 99% enantioselectivity; ESI mass spectrometric detection for the first time gave evidence of the presence of the PEG-organocatalyst host-guest complex. |
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