Organocatalytic activation of isocyanides: N-heterocyclic carbene-catalyzed enaminone synthesis from ketones
作者:Jungwon Kim、Soon Hyeok Hong
DOI:10.1039/c6sc05266e
日期:——
suggested a novel role for the carbene in the activation of isocyanides, and a proton transfer process was found to be crucial for the generation of two activated species in the catalytic cycle. Various enaminones, some of which are not easily accessible by other methods, were synthesized in excellent yields. This study clearly demonstrates the potential of the nucleophilic activation of isocyanides in
Silver(<scp>i</scp>)/base-promoted propargyl alcohol-controlled regio- or stereoselective synthesis of furan-3-carboxamides and (<i>Z</i>)-enaminones
作者:Sabera Sultana、Jae-Jin Shim、Sung Hong Kim、Yong Rok Lee
DOI:10.1039/c8ob01791c
日期:——
A novel and facile regioselective synthesis of furan-3-carboxamides by a silver(I)/base-promoted reaction of propargyl alcohol with 3-oxo amides has been demonstrated. This one-pot protocol provides a rapid synthetic approach to diverse trisubstituted furan-3-carboxamides via cascade nucleophilic addition, intramolecular cyclization, elimination, and isomerization reactions. Employing a substituted
已经证明了通过炔丙醇与3-氧代酰胺的银(I)/碱促进的反应的呋喃-3-甲酰胺的新颖且容易的区域选择性合成。这一一锅方案通过级联亲核加成,分子内环化,消除和异构化反应,为多种三取代呋喃-3-羧酰胺提供了一种快速的合成方法。通过使用取代的炔丙醇,由3-氧代酰胺经C–N键断裂,通过Ag 2 CO 3促进的反应,具有高立体选择性的(Z)-烯胺酮。
New Routes to Enaminones and Dienaminones from Benzotriazole Derivatives
作者:Alan R. Katritzky、Richard A. Barcock、Qui-He Long、Marudai Balsubramanian、Nageshwar Malhotra、John V. Greenhill
DOI:10.1055/s-1993-25838
日期:——
A new method has been developed for the regioselective preparation of enaminones and dienaminones starting from N-[1-(4-methylphenylamino)ethyl]benzotriazole employing mild conditions. Thus, 1-substituted 3-(4-methylphenylamino)-2-propen-1-ones, 1-(4-methylphenylamino)-1-hexen-3-one, ethyl 3-(4-methylphenylamino)-2-propenoate, 1-cyclohexyl-5-(phenylamino)-2,4-pentadien-1-one and ethyl 5-(arylamino)-2,4-pentadienoates are prepared in good yields.
Dutta, Milan Chandra; Chanda, Kaushik; Karim, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2004, vol. 43, # 11, p. 2471 - 2474
作者:Dutta, Milan Chandra、Chanda, Kaushik、Karim、Vishwakarma