Diaryl-2-pyrrolidinemethanols catalyzed enantioselective epoxidation of α,β-enones: new insight into the effect of structural modification of the catalyst on reaction efficiency
作者:Alessandra Lattanzi、Alessio Russo
DOI:10.1016/j.tet.2006.10.005
日期:2006.12
Catalytic enantioselectiveepoxidation of α,β-unsaturated ketones promoted by diaryl-2-pyrrolidinemethanols and tert-butyl hydroperoxide (TBHP) is described. Investigation on structural modifications of the diaryl-2-pyrrolidinemethanols showed that fine tuning of the stereoelectronics of the substituents on the aryl moiety is important to achieve high efficiency. By employing a structurally optimized
Asymmetric Epoxidation oftrans-Chalcones Organocatalyzed by β-Amino Alcohols
作者:Alessio Russo、Alessandra Lattanzi
DOI:10.1002/ejoc.200800140
日期:2008.6
examined as organocatalysts in the epoxidation of trans-chalcones with tert-butyl hydroperoxide as the oxidant. Primary, secondary, and tertiary β-amino alcohols are able to promote the reaction with variable activity and level of asymmetric induction. Subtle modifications to the structures of simple primary β-amino alcohol strongly influenced their efficiency in the epoxidation. They are promising catalysts
Heterogenization of Shibasaki's Binol/La Catalyst for Enantioselective Epoxidation of α,β-Unsaturated Ketones with Multitopic Binol Ligands: The Impact of Bridging Spacers
作者:Xingwang Wang、Lei Shi、Mingxing Li、Kuiling Ding
DOI:10.1002/anie.200501676
日期:2005.10.7
Asymmetric Epoxidation of Enones Promoted by Dinuclear Magnesium Catalyst
作者:Joanna A. Jaszczewska‐Adamczak、Jacek Mlynarski
DOI:10.1002/adsc.202100482
日期:2021.9.7
still a challenging task. In this perspective, we present the application of chiral dinuclear magnesium complexes for asymmetricepoxidation of a broad range of electron-deficient enones. We demonstrate that the in situ generated magnesium-ProPhenol complex affords enantioenriched oxiranes in high yields and with excellent enantioselectivities (up to 99% ee). Our extensive study verifies the literature