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  • Title: N-heterocyclic carbene catalysed asymmetric cross-benzoin reactions of heteroaromatic aldehydes with trifluoromethyl ketones.
    Author: Enders D, Grossmann A, Fronert J, Raabe G.
    Journal: Chem Commun (Camb); 2010 Sep 14; 46(34):6282-4. PubMed ID: 20694237.
    Abstract:
    A new triazolium salt derived N-heterocyclic carbene catalyses an asymmetric cross-benzoin-type reaction of heteroaromatic aldehydes and various trifluoromethyl ketones in good to excellent yields (69-96%) and moderate to good enantioselectivities (ee = 39-85%). Up to 99% ee can be achieved by recrystallisation.
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