European Journal of Organic Chemistry Volume 2011, Issue 23, pages 4298–4301, August 2011
Dual Secondary Amine/N-Heterocyclic Carbene Catalysis in the Asymmetric Michael/Cross-Benzoin Cascade Reaction of β-Oxo Sulfones with Enals
Dieter Enders, André Grossmann, He Huang, Gerhard Raabe
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http://dx.doi.org/10.1002/ejoc.201100690