Highly Substituted 2,3-Dihydroisoxazoles by Et<sub>3</sub>N-Catalyzed Tandem Reaction of Electron-Deficient 1,3-Conjugated Enynes with Hydroxylamines
作者:Xiuzhao Yu、Bo Du、Kai Wang、Junliang Zhang
DOI:10.1021/ol100490y
日期:2010.4.16
reaction of electron-deficient 1,3-conjugated enynes with hydroxylamines was developed which provided rapid, metal-free, and regioselective access to highly substituted multifunctionalized 2,3-dihydroisoxazoles under mild conditions. The reactions of 3-(2-arylethynyl)-4H-chromen-4-ones with hydroxylamines afford β-amino enones under the same reaction conditions.
Stereoselective synthesis of bicyclo[3.n.1]alkenone frameworks by Lewis acid-catalysis
作者:Stalin R. Pathipati、Lars Eriksson、Nicklas Selander
DOI:10.1039/c7cc06400d
日期:——
An intermolecular cyclization of alkynyl enones with cyclic ketones for the synthesis of bicyclo[3.n.1]alkenones is reported. This protocol exhibits a high functional group tolerance and provides access to a variety of bicyclic systems found as skeletons in many natural products.
A Base-Promoted Tandem Cycloaddition/Air Oxidation Reaction of Electron-Deficient Conjugated Enynes and Hydrazines: Synthesis of Highly Substituted Pyrazoles
作者:Xiuzhao Yu、Junliang Zhang
DOI:10.1002/chem.201202583
日期:2012.10.8
Rapid access: A base‐mediated cycloaddition/oxidationreaction of hydrazines and electron‐deficient 1,3‐conjugatedenynes gives pyrazole derivatives, some of which are not easily accessible by other methods (see scheme). The reaction conditions are mild, thus enabling a variety of functional groups to be tolerated.
Alkynyl Group as Activating Group: Base-Catalyzed Diastereoselective Domino Reactions of Electron-Deficient Enynes
作者:Wenbo Li、Yuanjing Xiao、Junliang Zhang
DOI:10.1002/adsc.200900633
日期:2009.12
This paper describes a base-catalyzeddominoreaction of electron-deficientenynes with malonate-derived α,β-unsaturated esters and ketones, which provides a rapid, stereoselective access to multi-functionalized cyclopentanes and inden-5(6 H)-ones in high yields. In this reaction, the alkynylgroup of the enyne acts as an activatinggroup rather than a reacting group.
Efficient Assembly of Allenes, 1,3-Dienes, and 4<i>H</i>-Pyrans by Catalytic Regioselective Nucleophilic Addition to Electron-Deficient 1,3-Conjugated Enynes