Catalytic enantioselective tandem carbonyl ylide formation—intramolecular cycloaddition with unsaturated α-diazo-β,ε-diketo sulfones
作者:David M. Hodgson、Rebecca Glen、Alison J. Redgrave
DOI:10.1016/j.tetasy.2009.02.031
日期:2009.5
The synthesis and 1,3-dipolar cycloaddition reactions of unsaturated alpha-diazo-beta,epsilon-diketo sulfones 7 using chiral rhodium catalysts (up to 71.5:28.5 er) are described. (C) 2009 Elsevier Ltd. All rights reserved.
Catalytic Enantioselective [3 + 2]-Cycloadditions of Diazoketone-Derived Aryl-Substituted Carbonyl Ylides
作者:David M. Hodgson、Rebecca Glen、Guy H. Grant、Alison J. Redgrave
DOI:10.1021/jo026307t
日期:2003.1.1
An evaluation of alpha-aryl-alpha-diazodiones in tandem carbonyl ylide formation-enantioselective [3 + 2]-cycloaddition reactions is described. Such substrates were designed to allow investigation of the electronic characteristics of the dipole upon asymmetric induction. Intramolecular cycloadditions (with a tethered alkene dipolarophile) were found to occur in good to quantitative yields, with a difference