New 1,2,4,5-tetrakis-(N-imidazoliniummethyl)benzene and 1,2,4,5-tetrakis-(N-benzimidazoliummethyl)benzene salts as N-heterocyclic tetracarbene precursors: synthesis and involvement in ruthenium-catalyzed allylation reactions
作者:Nevin Gürbüz、Serpil Demir、Ismail Özdemir、Bekir Cetinkaya、Christian Bruneau
DOI:10.1016/j.tet.2009.12.004
日期:2010.2
New tetraimidazolinium and tetrabenzimidazolium salts have been prepared. Upon reaction with tBuOK, they generate carbene ligands, which were associated in situ to [RuCp*(MeCN)3]PF6 to produce new ruthenium catalysts that are active for the substitution of allylic substrates by amines, phenols, and carbonucleophiles. The influence of the N-heterocyclic core as well as that of the N-substitutents at
已经制备了新的四咪唑啉鎓盐和四苯并咪唑鎓盐。与t BuOK反应后,它们生成卡宾配体,该卡宾配体与[RuCp *(MeCN)3 ] PF 6原位缔合,从而生成新的钌催化剂,该催化剂对用胺,酚和碳亲核试剂取代烯丙基底物具有活性。已经研究了N-杂环核心以及盐外围的N-取代基对反应性和区域选择性的影响。