DBU-mediated [4 + 2] annulations of donor–acceptor cyclopropanes with 3-aryl-2-cyanoacrylates for the synthesis of fully substituted anilines
作者:Jiaming Liu、Siran Qian、Zhenjie Su、Cunde Wang
DOI:10.1039/c7ra07230a
日期:——
A facilesynthesis of fully substituted anilines by the DBU-mediated [4 + 2] annulation of donor–acceptor 1,1-dicyano-cyclopropanes with 3-aryl-2-cyanoacrylate has been developed. This reaction involves a highly efficient multiple domino sequence consisting of ring opening of donor–acceptor cyclopropanes, regioselective intermolecular Michael addition, intramolecular nucleophilic addition and aromatization
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.