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
Axially chiral biaryls are ubiquitous structural motifs of biologically active molecules and privileged ligands for asymmetric catalysis. Their properties are due to their configurationally stable axis, and therefore, the control of their absolute configuration is essential. Efficient access to atropo‐enantioenriched biaryl moieties through asymmetric direct C−H activation, by using enantiopure sulfoxide