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