Highly Effective and Diastereoselective Synthesis of Axially Chiral Bis-sulfoxide Ligands via Oxidative Aryl Coupling
摘要:
A series of axially chiral bis-sulfoxide ligands have been efficiently synthesized via oxidative coupling with high diastereoselectivities. The axial chirality is well controlled by the tert-butylsulfinyl or the p-tolylsulfinyl group. These axially chiral bis-sulfoxides proved to be remarkably efficient ligands for the rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to 2-cyclohexenone with 99% ee.
Chiral sulfoxide–olefin ligands: tunable stereoselectivity in Rh-catalyzed asymmetric 1,4-additions
作者:Guihua Chen、Jiangyang Gui、Peng Cao、Jian Liao
DOI:10.1016/j.tet.2012.02.038
日期:2012.4
A class of chiral sulfoxide-olefins were designed and synthesized through concise routes. Their applications as ligands in Hayashi-Miyaura reaction were studied, which found that vinyl substituents of the ligands vary in stereocontrolling ability. Particularly, either isomer of adducts with excellent ees could be readily obtained through changing the position of the substituents of olefins as well as changing the configuration of the C=C bond of the ligands. Meanwhile, the substrate scope of arylboronic acids and alkenes was clearly shown. (C) 2012 Elsevier Ltd. All rights reserved.
Highly Effective and Diastereoselective Synthesis of Axially Chiral Bis-sulfoxide Ligands via Oxidative Aryl Coupling
作者:Qing-An Chen、Xiang Dong、Mu-Wang Chen、Duo-Sheng Wang、Yong-Gui Zhou、Yu-Xue Li
DOI:10.1021/ol100536e
日期:2010.5.7
A series of axially chiral bis-sulfoxide ligands have been efficiently synthesized via oxidative coupling with high diastereoselectivities. The axial chirality is well controlled by the tert-butylsulfinyl or the p-tolylsulfinyl group. These axially chiral bis-sulfoxides proved to be remarkably efficient ligands for the rhodium-catalyzed asymmetric 1,4-addition of arylboronic acids to 2-cyclohexenone with 99% ee.