Phosphine-Catalyzed Annulations between Modified Allylic Derivatives and Polar Dienes and Substituent Effect on the Annulation Mode
作者:Junjun Tian、Haiyun Sun、Rong Zhou、Zhengjie He
DOI:10.1002/cjoc.201300646
日期:2013.10
In this work, the phosphine‐catalyzed annulationreactions between modifiedallylic derivatives and polar 1,1‐dicyano‐1,3‐dienes have been studied. In the catalysis of PPh3 (20 mol%), a [4+1] annulationreaction is realized between a series of 1,1‐dicyano‐2,4‐diaryl‐1,3‐dienes and ethoxycarbonyl‐activatedallylic acetate, producing polysubstituted cyclopentenes in modest to excellent yields. It is
Chiral phosphine-catalyzed asymmetric [4 + 1] annulation of polar dienes with allylic derivatives: Enantioselective synthesis of substituted cyclopentenes
作者:Hanyuan Li、Zhengjie He
DOI:10.1016/j.tetlet.2021.152863
日期:2021.3
A chiral phosphine-catalyzedasymmetric [4 + 1] annulation reaction of polar 1,3-dienes and allylic derivatives is reported. Under the catalysis of P-chiral bicyclic phosphine (15 mol%), a series of 1,1-dicyano-2,4-diaryl-1,3-dienes (21 examples) readily undergo stereoselective [4 + 1] annulation reactions with allylic acetate under mild conditions, delivering enantio-enriched polysubstituted cyclopentenes