Chiral pyrrolidine quaternary derivatives as organocatalysts for asymmetric Michael additions |
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Authors: | Huichao Sun Ge Wang Xilong Yan Ligong Chen |
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Institution: | 1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China
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Abstract: | A series of chiral pyrrolidine quaternary derivatives were designed and synthesized. It was found that these derivatives are highly efficient organocatalysts for the asymmetric Michael addition reactions of aldehydes and ketones to nitroolefins with high yields (up to 96%), high enantioselectivities (up to 99% ee), and high diastereoselectivities (up to 97:3 dr). Furthermore, catalyst 7a could be recycled without remarkable loss of catalytic activity and stereoselectivity. |
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