Synthesis of Planar Chiral [2.2]Paracyclophanyl Imidazo[1,5-<i>a</i>]pyridinium Salts for the Rhodium-Catalyzed Asymmetric Arylation
作者:Dengxia Wang、Yudao Ma、Fuyan He、Wenzeng Duan、Lei Zhao、Chun Song
DOI:10.1080/00397911.2011.610548
日期:2013.2.1
Abstract Several novel flexibility-restricted imidazo[1,5-a]pyridinium triflates (abbreviated as imidazolium salts) were synthesized from (4S p,13R p)-(−)-4-amino-13-bromo[2.2]paracyclophane and pyridylaldehyde. These imidazolium salts can be used as nitrogen-containing heterocyclic carbene precursors in asymmetric catalysis and here they are applied in the Rh-catalyzed asymmetric 1,2-addition of arylboronic
摘要 以(4S p,13R p)-(-)-4-氨基-13-溴[2.2]对环芳烷和吡啶醛为原料合成了几种新型柔性受限的咪唑并[1,5-a]吡啶鎓三氟甲磺酸盐(简称咪唑鎓盐)。 . 这些咪唑鎓盐可用作不对称催化中的含氮杂环卡宾前体,在此它们用于 Rh 催化的芳基硼酸与醛的不对称 1,2-加成反应。在优化催化条件和测试一系列底物后,获得了适中的对映选择性和良好的产率。图形概要