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A New Cysteine-Derived Ligand as Catalyst for the Addition of Diethylzinc to Aldehydes: The Importance of a ‘Free’ Sulfide Site for Enantioselectivity

Antonio L. Braga*a, Elenilson F. Alvesa, Claudio C. Silveiraa, Gilson Zenia, Helmoz R. Appeltb, Ludger A. Wessjohann*c
a Departamento de Química, Universidade Federal de Santa Maria, 97105-900, Santa Maria, RS Brazil
Fax: +55(55)2208031; e-Mail: albraga@quimica.ufsm.br;
b Centro Universitário Franciscano, Rua dos Andradas, 1614 - Centro, 97010-032, Santa Maria, RS Brazil
c Leibniz Institute of Plant Biochemistry, Weinberg 3, 06120 Halle (Saale), Germany