Reductive <i>tert</i>-Butylation of Anils by <i>tert</i>-Butylmercury Halides<sup>1</sup>
作者:Glen A. Russell、Lijuan Wang、Ragine Rajaratnam
DOI:10.1021/jo961544f
日期:1996.1.1
promote a free radical chain process involving electron transfer by substrate activation and/or by increasing the electron affinity of the intermediate radicals. Since the adduct radicals formed from benzylideneanilines are more easily protonated than the parent Schiff bases, PTSA but not NH(4)(+) demonstrates substrate activation, although both proton donors promote the free radical reaction.
叔丁基自由基加到亚苄基苯胺的碳原子上形成苯胺基自由基,在PTSA或NH(4)(+)在Me(2)SO中存在时将其质子化。ate络合物t-BuHgI(2)(-)易于还原生成的苯胺自由基阳离子。在没有质子供体的情况下,t-BuHgI还将氢原子转移到苯胺基上,得到还原性烷基化产物。质子化可促进自由基链过程,该过程涉及通过底物活化和/或通过增加中间自由基的电子亲和力进行电子转移。由于由苄叉基苯胺形成的加合物自由基比母体Schiff碱更容易被质子化,因此PTSA而不是NH(4)(+)表现出底物活化作用,尽管两个质子供体都促进自由基反应。