An efficient, direct nucleophilic allylicsubstitution of α-, β- and γ-substituted alcohols with enamines, using the Pd(OAc)2/PPh3 catalyst system and ZnBr2 as a promoter in CH2Cl2 at reflux, is reported. The reaction course was dependent on the steric hindrance at the α- or γ-positions with respect to the functionalized α-carbon, selectively affording in moderate to good yields, α- or γ-homoallyl
Efficient Synthesis of γ‐Keto Esters from Enamines and EDA
作者:Dan Huang、Ming Yan、Wei‐Jie Zhao、Qi Shen
DOI:10.1081/scc-200050387
日期:2005.3.1
Abstract The reaction of enamines with ethyldiazoacetate (EDA) catalyzed by dirhodium and copper complexes provided γ‐keto esters in good yields. The influences of catalyst, reaction solvent, temperature, and structure of enamines on this transformation were investigated.
Synthesis and Properties of <i>g</i><i>em</i>-(Difluorocyclopropyl)amine Derivatives of Bicyclo[<i>n</i>.1.0]alkanes
作者:Ireneusz Nowak、John F. Cannon、Morris J. Robins
DOI:10.1021/ol047943b
日期:2004.12.1
[reaction: see text] Generation of difluorocarbene(carbenoid) in the presence of enamines derived from cyclic ketones results in overall insertion of CF2 to produce bicyclic difluorocyclopropylamines. These adducts are very weakly basic, and their thermal stabilities vary markedly with their structures.
Base-Promoted Reactions of Dichlorocarbene Adducts of Cyclic Enamines: A New Route to Annulated Pyrroles
作者:Alex C. Bissember、Andrew T. Phillis、Martin G. Banwell、Anthony C. Willis
DOI:10.1021/ol7021774
日期:2007.12.1
Treatment of the gem-dihalogenocyclopropanes 1-5 with potassium tert-butoxide or LDA results in the formation of the corresponding and annulated pyrroles 13-17, respectively.
New reaction of enamines with aryldiazoacetates catalyzed by transition metal complexes
作者:Wei-Jie Zhao、Ming Yan、Dan Huang、Shun-Jun Ji
DOI:10.1016/j.tet.2005.03.093
日期:2005.6
The reaction of aryldiazoacetates with enamines catalyzed by copper and rhodium complexes provided γ-keto esters in good yields. A full investigation of the effects of solvents, catalysts, enamines and aryldiazoacetates on the reaction was carried out. Careful analysis of the crude reaction mixture revealed a substituted enamine as the primary product, which was hydrolyzed over silica gel to give a