Silver(I)−Diene Complexes as Versatile Catalysts for the <i>C</i>-Arylation of <i>N</i>-Tosylaziridines: Mechanistic Insight from In Situ Diagnostics
作者:Milan Bera、Sujit Roy
DOI:10.1021/jo100260k
日期:2010.7.2
31P, 109Ag) and ESI-MS probe: (I) evaluation of Hammett reaction constant (ρ); (II) correlation of initial rate (k) versus cone angle (θ) of ligand L for reactions mediated by [Ag(COD)2]PF6/L (where L is a phosphine or a phosphite ligand); (III) identification of silver−arene intermediates in solution; and (IV) correlation of initial rate (k) with ΔHOMO−LUMO of [Ag(diene)2]PF6 obtained from preliminary
银(I)络合物将[Ag(二烯)2 ] + ý - (其中,二烯烃=环辛二烯,降冰片二烯,和1,3-环己二烯; Y - = PF 6 -,BF 4 - )有效地催化的芳基化Ñ与-tosylaziridines芳烃和杂芳烃在环境条件下可提供相应的具有出色区域选择性的β-芳基胺衍生物。为了了解底物活化的性质以及初始键断裂/制备步骤,借助原位NMR(1 H,31 P,109Ag)和ESI-MS探针:(I)Hammett反应常数(ρ)的评估;(II)由[Ag(COD)2 ] PF 6 / L(其中L是膦或亚磷酸酯配体)介导的反应的配体L的初始速率(k)与锥角(θ)的相关性;(III)鉴定溶液中的银芳烃中间体;(IV)初始速率(k)与从初步DFT研究获得的[Ag(二烯)2 ] PF 6的ΔHOMO-LUMO的相关性。研究I得出ρ值为-0.586,表明亲电干扰的程度比典型的路易斯酸催化过程小得多。研究二