Electronic and steric tuning of chiral diene ligands for rhodium-catalyzed asymmetric arylation of imines
作者:Kazuhiro Okamoto、Tamio Hayashi、Viresh H. Rawal
DOI:10.1039/b904624k
日期:——
Rhodium-catalyzedasymmetricarylation of imines using electronically and sterically-modified chiral diene ligands gave the corresponding diarylmethylamines in high yield and with high enantioselectivity using just 0.3 mol% of catalyst.
Simple Chiral Diene Ligands Provide High Enantioselectivities in Transition-Metal-Catalyzed Conjugate Addition Reactions
作者:Kazuhiro Okamoto、Tamio Hayashi、Viresh H. Rawal
DOI:10.1021/ol801931v
日期:2008.10.2
Chiral dienes possessing the bicyclo[2.2.2]octadiene framework were prepared readily through the [4 + 2] cycloaddition of ( R)-alpha-phellandrene with methyl propiolate as the key step. Diene 9, substituted with a tertiary alcohol on one of the two double bonds, is prepared in just one step from the cycloadduct and is highly effective as a chiralligand for rhodium-catalyzedasymmetricconjugate addition