1. For reviews on organocatalysis, see: (a) Berkessel, A.; Groger, H. Asymmetric Organocatalysis: From Biomimetic Concepts to Applications in Asymmetric Synthesis; Wiley-VCH Verlag GmbH & Co. KGaA: Weinheim, 2005; (b) Dalko, P.I., Ed.; Enantioselective Organocatalysis; Wiley-VCH: Weinheim, 2007; (c) Dalko, P.I.; Moisan, L. Angew. Chem. Int. Ed. 2004, 43, 5138–5175; (d) Seayad, J.; List, B. Org. Biomol. Chem. 2005, 3, 719–724; (e) Bertelsen, S.; Jørgensen, K.A. Chem. Soc. Rev. 2009, 36, 2178–2189; (f) Barbas, III. C.F. Angew. Chem. Int. Ed. 2008, 47, 42–47; (g) Pellissier, H. Tetrahedron 2007, 63, 9267–9331; (h) Dondoni, A.; Massi, A. Angew. Chem. Int. Ed. 2008, 47, 4638–4660; (i) List, B.; Yang, J.W. Science 2006, 313, 1584–1586
2. For recent reviews of asymmetric Michael addition reactions, see: (a) Berner, O.M.; Tedeschi, L.; Enders, D. Eur. J. Org. Chem. 2002, 1877-1894;
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4. (c) List, B. Acc. Chem. Res. 2004, 37, 548-557
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