Two Stereoinduction Events in One C−H Activation Step: A Route towards Terphenyl Ligands with Two Atropisomeric Axes
作者:Quentin Dherbassy、Jean‐Pierre Djukic、Joanna Wencel‐Delord、Françoise Colobert
DOI:10.1002/anie.201801130
日期:2018.4.16
scaffolds—ortho‐orientated terphenyls presenting two atropisomeric Ar–Ar axes. These unusual structures were built up by using the C−H activation approach, and remarkably, both chiral axes were controlled with excellent stereoselectivity in a single transformation. During the reaction, not only does atroposelective functionalization of a biaryl precursor occur to establish one stereogenic axis, but an
在这里,我们公开了原始手性支架的合成-呈现两个阻转异构Ar-Ar轴的邻位三联苯。这些不寻常的结构是通过使用CH活化方法建立的,并且值得注意的是,两个手性轴在一次转化中都具有出色的立体选择性。在反应过程中,不仅会发生联芳基前体的对映选择性官能化以建立一个立体轴,而且还会发生空前的对映立体选择性CH芳基化反应,从而生成第二个立体成因元素。这些对映体纯的邻位叔苯基具有原始的三维结构,因此为建立对映体纯的双齿配体(例如新的配体S / N-Biax和二膦酸BiaxPhos)库提供了独特的基础。