Organocatalytic asymmetric aldol reactions mediated by a cysteine-derived prolinamide - Schwab, Ricardo S.; Galetto, Fábio Z.; Azeredo, Juliano Braun de; Braga, Antonio Luiz; Lüdtke, Diogo Seibert; Paixão, Márcio Weber (Tetrahedron Letters, 2008)