Cinchona Alkaloid-Catalyzed Enantioselective Amination of α,β-Unsaturated Ketones: An Asymmetric Approach to Δ2-Pyrazolines
作者:Nathaniel R. Campbell、Bingfeng Sun、Ravi P. Singh、Li Deng
DOI:10.1002/adsc.201100447
日期:2011.11
interest due to their therapeutic properties and utility in the synthesis of 1,3-diamines, yet few asymmetric methods exist to prepare them. An unprecedented highly enantioselective organocatalytic synthesis of 2-pyrazolines was achieved through an asymmetric conjugate addition catalyzed by 9-epi-amino cinchona alkaloids followed by deprotection-cyclization, which furnished chiral 2-pyrazolines in 46-78%
Catalytic Enantioselective Peroxidation of α,β-Unsaturated Ketones
作者:Xiaojie Lu、Yan Liu、Bingfeng Sun、Brittany Cindric、Li Deng
DOI:10.1021/ja802982h
日期:2008.7.1
established epoxidation pathway into a peroxidation pathway, the first efficient catalytic peroxidation has been successfully developed. Employing readily available alpha,beta-unsaturated ketones and hydroperoxides and an easily accessible cinchona alkaloid catalyst, this novel reaction will open new possibilities in the asymmetric synthesis of chiral peroxides. Under different conditions a highly enantioselective
Asymmetric Aza-Michael Reactions of α,β-Unsaturated Ketones with Bifunctional Organic Catalysts
作者:Xiaojie Lu、Li Deng
DOI:10.1002/anie.200802785
日期:2008.9.22
Intercepting the Gold-Catalysed Meyer-Schuster Rearrangement by Controlled Protodemetallation: A Regioselective Hydration of Propargylic Alcohols
作者:Matthew N. Pennell、Michael P. Kyle、Samantha M. Gibson、Louise Male、Peter G. Turner、Richard S. Grainger、Tom D. Sheppard
DOI:10.1002/adsc.201600101
日期:2016.4.28
acid or a boronic acid. This provides an interesting alternative to an aldol reaction when combined with the straightforward addition of an alkyne to an aldehyde or ketone. The gold-catalysed reaction of an electron-deficient, sterically hindered propargylic alcohol with a boronic acid led to the formation of an unusually stable cyclic boron enolate.