Reversible Alkene Insertion into the Pd–N Bond of Pd(II)-Sulfonamidates and Implications for Catalytic Amidation Reactions
作者:Paul B. White、Shannon S. Stahl
DOI:10.1021/ja208560h
日期:2011.11.23
Alkene insertion into Pd-N bonds is a key step in Pd-catalyzed oxidative amidation of alkenes. A series of well-defined Pd(II)-sulfonamidate complexes have been prepared and shown to react via insertion of a tethered alkene. The Pd-amidate and resulting Pd-alkyl species have been crystallographically characterized. The alkene insertion reaction is found to be reversible, but complete conversion to
烯烃插入 Pd-N 键是 Pd 催化烯烃氧化酰胺化的关键步骤。已经制备了一系列明确定义的 Pd(II)-磺酰胺配合物,并显示通过插入系链烯烃进行反应。Pd-酰胺化物和所得的Pd-烷基物质已被结晶学表征。发现烯烃插入反应是可逆的,但在 O(2) 存在下观察到完全转化为氧化胺化产物。电子效应研究表明,烯烃插入 Pd-N 键在动力学和热力学上都有利于富电子酰胺化物。