Copper-catalyzed tandem oxidative cyclization of arylacetamides: efficient access to N-functionalized isatins
作者:Jie Sun、Bingxin Liu、Bin Xu
DOI:10.1039/c3ra40657a
日期:——
An efficient copper-catalyzed synthesis of N-substituted isatins has been developed in good yields from easily accessible arylacetamides. A wide range of electronically and structurally varied nitrogen fragments could be assembled through this tandem C–O/C–N bond-forming process by tuning the reaction conditions.
N-substituted oxindoles were obtained through a facile KOH/DMSO promoted intramolecular cyclization of o-bromophenylacetamides in good yields. Furthermore, isoindigo derivatives were readily synthesized through sequential intramolecular cyclization, oxidation and condensation of o-bromophenylacetamide in the presence of copper (II) acetate monohydrate, iodobenzene diacetate and KOH/DMSO. This method
Synthesis of Unsymmetrical Diaryl Acetamides, Benzofurans, Benzophenones, and Xanthenes by Transition-Metal-Free Oxidative Cross-Coupling of <i>sp</i><sup>3</sup> and <i>sp</i><sup>2</sup> C–H Bonds
A chemo- and regioselective intermolecular sp3 C–H and sp2 C–H coupling reaction for C–C bond formation is described to access unsymmetrical diaryl acetamides under TM-free conditions from sec- and tert-arylacetamides and nitroarenes using tert-butoxide base in DMSO at room temperature. The coupling partners with sensitive functionalities such as chloro, bromo, hydroxy, and cyano were also amenable