Cyclic (Amino)(aryl)carbenes (CAArCs) as Strong σ‐Donating and π‐Accepting Ligands for Transition Metals
作者:Bin Rao、Huarong Tang、Xiaoming Zeng、Liu Leo Liu、Mohand Melaimi、Guy Bertrand
DOI:10.1002/anie.201507844
日期:2015.12
Cyclic (amino)(aryl)carbenes (CAArCs) result from the replacement of the alkyl substituent of cyclic (alkyl)(amino) carbenes (CAACs) by an aryl group. This structural modification leads to enhanced electrophilicity of the carbene center with retention of the high nucleophilicity of CAACs, and therefore CAArCs feature a small singlet–triplet gap. The isoindolium precursors are readily prepared in good
环状(氨基)(芳基)卡宾(CAArC)是由芳基取代环状(烷基)(氨基)卡宾(CAAC)的烷基取代基。这种结构修饰导致卡宾中心的亲电子性增强,同时保留了CAAC的高亲核性,因此CAArC的单线态-三重态间隙很小。在[RhCl(cod)] 2和[(Me 2[S)AuCl]分别导致了空气稳定的铑和金载有ArArC的配合物。铑配合物可促进二苯基环丙烯酮与苯丙丙酸乙酯的[3 + 2]环加成反应,并通过CH活化诱导2-乙烯基吡啶加成至烯烃。金络合物允许由苯胺和苯基乙炔催化制备1,2-二氢喹啉的三组分。这些初步结果说明了CAArC配体在过渡金属催化中的潜力。