Asymmetric Synergy between Chiral Dienes and Diphosphines in Cationic Rh(I)-Catalyzed Intramolecular [4 + 2] Cycloaddition
作者:Kohsuke Aikawa、Susumu Akutagawa、Koichi Mikami
DOI:10.1021/ja0650100
日期:2006.10.1
High enantioselective [4 + 2] cycloaddition can be achieved by cationic Rh complexes bearing not only chiral phosphine but also chiral diene. This is the first example of asymmetric synergy between chiral dienes and diphosphines.
Readily Available [2.2.2]-Bicyclooctadienes as New Chiral Ligands for Ir(I): Catalytic, Kinetic Resolution of Allyl Carbonates
作者:Christian Fischer、Christian Defieber、Takeyuki Suzuki、Erick M. Carreira
DOI:10.1021/ja0390707
日期:2004.2.1
We report an Ir(I)-catalyzed kinetic resolution of secondary allylic carbonates allowing for their isolation in up to 98% ee. Importantly, the study documents the synthesis and use of a new class of chiral [2.2.2]-bicyclooctadiene ligands for iridium.