8. Chiral Boron-Bridged Bisoxazolines: Readily Available Anionic Ligands for Asymmetric Catalysis
   Clément Mazet, Valentin Köhler, Andreas Pfaltz*
   Angew. Chem. Int. Ed. 2005, 44, 4888-4891
   [ Présenté dans : Chem. Eng. News 2005, 83(36), 40-48]

Asymmetric cyclopropanation and monobenzoylation reactions of meso diols employing borabox catalysts 1 (M=Cu) result in high enantioselectivities. The borabox ligands are anionic analogues of the bisoxazolines 2 and are readily prepared by lithiation of oxazolines and subsequent trapping with boron halides. The considerable potential of borabox ligands in asymmetric catalysis is shown.

archive ouverte unige:6980

DOI de la version éditeur : 10.1002/anie.200501111