Pd(II)-catalyzed synthesis of indoles from α-aryloxime O-pentafluorobenzoates via intramolecular aromatic C–H amination
作者:Shunsuke Chiba、Line Zhang、Stephen Sanjaya、Gim Yean Ang
DOI:10.1016/j.tet.2010.05.029
日期:2010.7
α-Aryl-α-aminocarbonyloxime O-pentafluorobenzoates are found to be promising precursors for synthesis of 2,3-disubstituted indole derivatives catalyzed by PdCl2(MeCN)2 in the presence of MgO as a base. The reaction is supposed to proceed viaintramolecular aromatic C–H amination of a vinyl nitrene–palladium intermediate.
General Synthesis of Fully Substituted 4-Aminooxazoles from Amides and 1,4,2-Dioxazol-5-ones Based on Amide Activation and Umpolung Process
作者:Yunxiang Weng、Lin Min、Lidong Shan、Hongchen Li、Xinyan Wang、Yuefei Hu
DOI:10.1021/acs.joc.0c02015
日期:2021.1.1
A general and efficientsynthesis of fully substituted 4-aminodixazoles was developed based on the strategies of amide activation and umpolung reaction. In this method, 1,4,2-dioxazol-5-ones were introduced as a rare type of umpolung reagent bearing a nucleophilic N-atom that could be used well together with the activating agent Tf2O. Because 1,4,2-dioxazol-5-ones played triple roles as an umpolung
An improved procedure for the aminocarbonylation of benzyl chloride derivatives using carbon monoxide and either primary or secondary amines has been developed. Studying the competing background alkylation reaction allowed the solvent and base to be selected for a simple catalyst screen, which, in turn, enabled the discovery of a method for the preparation of 2-arylacetamides under mild conditions