Metal-Free Intermolecular Oxidative C–N Bond Formation via Tandem C–H and N–H Bond Functionalization
作者:Abhishek A. Kantak、Shathaverdhan Potavathri、Rose A. Barham、Kaitlyn M. Romano、Brenton DeBoef
DOI:10.1021/ja2087085
日期:2011.12.14
development of a novel intermolecular oxidative amination reaction, a synthetic transformation that involves the simultaneous functionalization of both a N-H and C-H bond, is described. The process, which is mediated by an I(III) oxidant and contains no metal catalysts, provides a rapid and green method for synthesizing protected anilines from simple arenes and phthalimide. Mechanistic investigations
Nitrogen-centered radical-mediated C–H imidation of arenes and heteroarenes <i>via</i> visible light induced photocatalysis
作者:Hyejin Kim、Taehoon Kim、Dong Gil Lee、Sang Weon Roh、Chulbom Lee
DOI:10.1039/c4cc03905j
日期:——
The C-H imidation of arenes and heteroarenes has been achieved via visible light induced photocatalysis. In the presence of an iridium(III) photoredox catalyst, the reaction of aromatic substrates with N-chlorophthalimide furnishes the N-aryl products at room temperature through a nitrogen-centered radical mediated aromatic substitution.
In this study, a visible-light-induced intermolecular C-H bond imidation of arenes was achieved at ambient condition. By using simple phthalimide with (diacetoxyiodo)benzene and molecular iodine, direct metal-/photocatalyst-free C-N bond formation was achieved. The imidation protocol was designed by using time-dependent density functional theory calculations and experimentally demonstrated for 28 substrates
A novel protocol for the regioselective intermolecular amination of various arenes has been developed. By using an I(III) oxidant in the presence of a Au(I) catalyst, a direct and novel route for regioselectivelyaccessing a variety of substitutedaniline moieties has been achieved with yields as high as 90%. Mechanistic insight suggests that regioselectivity can be predicted based on electrophilic
Tris(ortho-tolyl)bismuth dichloride derivatives react with nucleophiles under basic conditions to give good to high yields of the C-arylated substrates. Under the same conditions, trimesitylbismuth dichloride affords only poor yields of the C-mesitylated substrates. Similar influence of the substitution pattern of tris(ortho-tolyl)bismuth diacetate derivatives was observed in the copper-catalysed arylation