Gewald-type reaction of double activated 2,3-diarylcyclopropanes with elemental sulfur for synthesis of polysubstituted 2-aminothiophenes
摘要:
A new synthetic procedure for the polysubstituted 2-aminothiophenes was developed via Gewald type ring-opening reaction of 1,1-dicyano-2,3-diarylcyclopropanes with elemental sulfur in N,N-dimethylformamide in the presence of morpholine as base. (C) 2014 Elsevier Ltd. All rights reserved.
Efficient synthesis of polysubstituted pyrrole-3-carbonitriles via reactions of 1,1-dicyano-2,3-diarylcyclopropanes with aromatic imines
作者:Qin Fu、Chao-Guo Yan
DOI:10.1016/j.tetlet.2011.06.085
日期:2011.8
Co(ClO4)2 smoothly catalyzed the reactions of 1,1-dicyano-2,3-diarylcyclopropanes with aromaticimines to give the novel polysubstituted pyrrole-3-carbonitriles bearing an 2-arylidenimino group in good to high yields in refluxing THF.
Synthesis of Functionalized 2-Aminopyrroles by Lewis Acid Catalyzed Ring-opening of 1,1,2,3-Tetrasubstituted Cyclopropanes with Arylamines
作者:Ying Han、Qin Fu、Wanquan Tang、Chaoguo Yan
DOI:10.1002/cjoc.201200229
日期:2012.8
Under the catalysis of Lewis acid Co(ClO4)2 the reaction of the sterically hindered 1,1,2,3‐tetrasubstituted cyclopropanes with arylamines in refluxing THF gave the functionalized 2‐aminopyrroles with sequential ring‐opening of cyclopropane, nucleophilic substitution, nucleophilic addition of cyano group and recyclization processes.