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.
Rh-Catalyzed Amination of Ethereal CαH Bonds: A Versatile Strategy for the Synthesis of Complex Amines
作者:Kristin Williams Fiori、James J. Fleming、Justin Du Bois