Preparation of 1,2,5-Trisubstituted 1<i>H</i>-Imidazoles from Ketenimines and Propargylic Amines by Silver-Catalyzed or Iodine-Promoted Electrophilic Cyclization Reaction of Alkynes
作者:Xiaorong Zhou、Zheng Jiang、Lexing Xue、Ping Lu、Yanguang Wang
DOI:10.1002/ejoc.201500704
日期:2015.9
From readily available propargylic amines, 1,2,5-trisubstituted imidazoles are efficiently obtained through a cascade reaction catalyzed by AgOTf or promoted by molecular iodine. The AgOTf-catalyzed reaction involves nucleophilic addition of propargylic amine to ketenimine, a silver-catalyzedelectrophiliccyclizationreaction of alkyne, and a tautomerism/isomerism/metal-H exchange cascade. The iodine-mediated
Reactions of carbethoxyalkylidenetriphenylphosphoranes with aryl azides
作者:P. Ykman、G. L'abbé、G. Smets
DOI:10.1016/s0040-4020(01)99395-0
日期:——
The title reaction has been shown to give a complex mixture of products from which triazoles (12 and 17), maleates (13), fumarates (14), triphenylphosphine oxide (15), iminophosphoranes (16) and triazenes (18) have been isolated. Their formation is rationalized by two reaction paths, involving addition of the azide onto the CC and CP bonds of the ylide. Diazoesters 5 and 19, which should result from
Base-mediated regioselective [3+2] annulation of ketenimines and isocyanides: efficient synthesis of 1,4,5-trisubstituted imidazoles
作者:Jinxiong Cai、Haijie Bai、Yuan Wang、Xianxiu Xu、Haiming Xie、Jun Liu
DOI:10.1039/c9cc01257e
日期:——
A novel base-mediated regioselective [3+2] annulation of active methylene isocyanides with ketenimines has been developed.
已开发出一种新颖的以碱为媒介的活性甲基异氰酸酯与酮亚胺的[3+2]加成选择性反应。
Selective Synthesis of 4-Alkylidene-β-lactams and <i>N</i>,<i>N</i>′-Diarylamidines from Azides and Aryloxyacetyl Chlorides via a Ketenimine-Participating One-Pot Cascade Process
作者:Yun-Yun Yang、Wang-Ge Shou、Deng Hong、Yan-Guang Wang
DOI:10.1021/jo702733h
日期:2008.5.1
A one-pot cascade approach to 4-alkylidene-β-lactams and N,N′-diarylamidines from aryl azides and aryloxyacetyl chlorides has been developed. The chemical outcome of the reaction can be controlled selectively by an appropriate choice of the stoichiometric ratio of different substrates and reagents. The products should find use in pharmaceutical discovery, especially in the development of new antimicrobial
Reaction between triphenylphosphine and aromatic amines in the presence of diethyl azodicarboxylate: an efficient synthesis of aryliminophosphoranes under neutral and mild conditions
作者:Mehdi Adib、Ehsan Sheikhi、Azadeh Deljoush
DOI:10.1016/j.tet.2011.03.097
日期:2011.6
An efficient synthesis of aryliminophosphoranes is described. A mixture of an aromatic amine, diethylazodicarboxylate and triphenylphosphine undergo a Mitsonobu type reaction at ambient temperature in dry dichloromethane to afford aryliminophosphoranes in excellent yields.