过渡金属催化的氮宾转移是将新的 C N 键合并到相对未功能化的支架中的有效方法。在本次通讯中,我们报告了水介质中位点和化学选择性 C H 键胺化反应的第一个例子。在这些反应中使用水作为溶剂的出乎意料的能力是有利的,因为它消除了有毒溶剂的使用并且使得反应能够在增加的浓度和较低的氧化剂负载下进行。使用水作为反应介质有可能扩大氮宾转移的范围,以涵盖各种生物分子和高极性底物,并能够控制 C H 键胺化的位点选择性的 pH 值。
Tunable differentiation of tertiary C–H bonds in intramolecular transition metal-catalyzed nitrene transfer reactions
作者:Joshua R. Corbin、Jennifer M. Schomaker
DOI:10.1039/c7cc01235g
日期:——
Metal-catalyzed nitrenetransfer reactions are an appealing and efficient strategy for accessing tetrasubstituted amines through the direct amination of tertiary C-H bonds.
作者:Juliet M. Alderson、Alicia M. Phelps、Ryan J. Scamp、Nicholas S. Dolan、Jennifer M. Schomaker
DOI:10.1021/ja5094309
日期:2014.12.3
The development of readily tunable and regioselective C-H functionalization reactions that operate solely through catalyst control remains a challenge in modern organic synthesis. Herein, we report that simple silver catalysts supported by common nitrogenated ligands can be used to tune a nitrene transfer reaction between two different types of C-H bonds. The results reported herein represent the first example of ligand-controlled and site-selective silver-promoted C-H amination.
A mechanistic analysis of the Rh-catalyzed intramolecular C–H amination reaction
作者:Kristin Williams Fiori、Christine G. Espino、Benjamin H. Brodsky、J. Du Bois
DOI:10.1016/j.tet.2008.11.073
日期:2009.4
A detailed mechanistic investigation of the intramolecular dirhodium tetracarboxylate-catalyzed sulfamate ester C-H amination reaction is presented. These studies provide support for the formation of a sulfamate-derived iminoiodinane, which reacts rapidly with the rhodium catalyst to generate a nitrenoid-type oxidant. Reactivity patterns, Hammett analysis, kinetic isotope measurement, and a cyclopropane clock experiment are indicative of a concerted, asynchronous transition structure in the product-determining C-H insertion event. (C) 2008 Published by Elsevier Ltd.