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  • Title: A new approach to switching of enantioselectivity in NHC-Cu-catalyzed conjugate addition of alkylzincs to cyclic enones.
    Author: Okamoto M, Yamamoto Y, Sakaguchi S.
    Journal: Chem Commun (Camb); 2009 Dec 21; (47):7363-5. PubMed ID: 20024229.
    Abstract:
    Conjugate addition of Et(2)Zn to 2-cyclohexen-1-one catalyzed by Cu(OTf)(2) combined with an azolium salt derived from (S)-leucinol produced the corresponding (S)-adduct, while the use of Cu(acac)(2) in combination with the same ligand afforded the (R)-adduct as a major product.
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