Iron and Manganese Catalysts for the Selective Functionalization of Arene C(sp<sup>2</sup>
)−H Bonds by Carbene Insertion
作者:Ana Conde、Gerard Sabenya、Mònica Rodríguez、Verònica Postils、Josep M. Luis、M. Mar Díaz-Requejo、Miquel Costas、Pedro J. Pérez
DOI:10.1002/anie.201601750
日期:2016.5.23
(N2CHCO2Et) catalyzed by Mn‐ or Fe‐based complexes in a completely selective manner are reported, with no formation of the frequently observed cycloheptatriene derivatives through competing Buchner reaction. The best catalysts are FeII or MnII complexes bearing the tetradentate pytacn ligand (pytacn= 1‐(2‐pyridylmethyl)‐4,7‐dimethyl‐1,4,7‐triazacyclononane). When using alkylbenzenes, the alkylic C(sp3)−H
据报道,第一个例子是通过基于锰或铁的络合物以完全选择性的方式催化重氮乙酸乙酯(N 2 CHCO 2 Et)直接活化未活化的芳基sp 2 C-H键。经常通过竞争性布赫纳反应观察到的环庚三烯衍生物。最好的催化剂是带有四齿吡喃配位体的Fe II或Mn II配合物(pytacn = 1-(2-吡啶基甲基)-4,7-二甲基-1,4,7-三氮杂环壬烷)。当使用烷基苯时,取代基的烷基C(sp 3)-H键保持未改性,因此该反应对sp 2 C-H键的官能化也是选择性的。