Asymmetric Michael Addition Induced by the Anion of an Imidazolium Salt

[摘要]：We describe the application of a chiral catalytic imidazolium salt derived from trans-L-hydroxyproline, the anion being the catalytic entity, as a catalyst for the asymmetric Michael addition. We report the first example of a catalytic Michael addition using this type of catalyst, leading to excellent yields (up to 99?%) and good selectivities (up to 99:1?dr, up to 82?%?ee).

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