AbstractA stereoselective method for the synthesis of axially chiral biaryl scaffolds by CH bond functionalization was accomplished using chiral sulfoxide both as the directing group enabling the regioselective activation of a CH bond and as the chiral auxiliary generating an asymmetric environment in the coordination sphere of the metal complex. We have demonstrated the directing ability of the p‐tolylsulfinyl group in promoting the Pd(II)‐catalyzed CH olefination of biphenyls.magnified image
Axial Chirality Control During Suzuki−Miyaura Cross-Coupling Reactions: The <i>tert</i>-Butylsulfinyl Group as an Efficient Chiral Auxiliary
作者:Françoise Colobert、Victoria Valdivia、Sabine Choppin、Frédéric R. Leroux、Inmaculada Fernández、Eleuterio Álvarez、Noureddine Khiar
DOI:10.1021/ol9020755
日期:2009.11.19
An efficient route to a new family of axially chiral biaryl ligands by a Suzuki−Miyaura cross-coupling reaction between ortho,ortho′-disubstituted aryl iodides bearing in ortho position a tert-butyl or p-tolylsulfinyl group and ortho-substituted phenyl boronic acids or esters is described. The comparison between the t-BuSO and p-TolSO groups as chiral controllers is reported. The modularity of the