New Chiral Auxiliaries for the Construction of Quaternary Stereocenters by Copper-Catalyzed Michael Reactions This work was supported by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie. We are also grateful to the Degussa-Hüls AG for gifts of amino acids and to Prof. Dr. S. Blechert for his support.
Technische Universität Berlin Institut für Organische Chemie, Sekretariat C 3 Strasse des 17. Juni 135, 10623 Berlin (Germany).
J
Christoffers
A
Mann