Atropo-enantioselective synthesis of a C3-symmetric tripodal ligand with three axially chiral biaryl subunits
作者:Gerhard Bringmann、Matthias Breuning、Robert-Michael Pfeifer、Petra Schreiber
DOI:10.1016/s0957-4166(03)00406-3
日期:2003.8
In contrast to the numerous successful applications of C-2-symmetric biaryls as powerful tools for asymmetric synthesis, there have so far been only few reports on combinations of C-3-symmetry with axial chirality. We present here the first enantioselective synthesis of a novel family of tripodal ligands containing three axially chiral biaryl subunits in an (M,M,M)- or, optionally, (P,P,P)-configured form. The incorporation of a PCl2- and a TiCl-fragment into the central cavity was achieved. (C) 2003 Elsevier Ltd. All rights reserved.