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C2-symmetric chiral disulfoxide ligands in rhodium-catalyzed 1,4-addition: From ligand synthesis to the enantioselection pathway

机译:铑催化的1,4-加成中的C2对称手性二亚砜配体:从配体合成到对映体选择途径

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摘要

A family of chiral C_2-symmetric disulfoxide ligands possessing biaryl atropisomeric backbones has been synthesized by using the Andersen methodology. Complete characterization includes X-ray crystallographic studies of all ligands and some of their rhodium complexes. Their synthesis, optical purity, electronic properties, and catalytic behavior in the prototypical rhodium-catalyzed 1,4-addition of phenylboronic acid to 2-cyclohexen-1-one are presented through an in depth study of this ligand class. Density functional theory calculations on the step of the catalytic cycle that determines the enantioselectivity are presented and reinforce the first hypothetical explanations for the high levels of asymmetric induction observed.
机译:通过使用Andersen方法合成了具有联芳基阻转异构体骨架的手性C_2对称二亚砜配体家族。完整的表征包括所有配体及其某些铑配合物的X射线晶体学研究。通过对此类配体类别的深入研究,介绍了它们的合成,光学纯度,电子性质以及在典型的铑催化的苯基硼酸向2-环己烯-1-酮加成的1,4-加成中的催化行为。提出了确定对映选择性的催化循环步骤的密度泛函理论计算,并加强了观察到的高水平不对称诱导的第一个假设解释。

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