Here we report a paired electrochemical coupling of readily accessible nitro-compounds with benzyl alcohols to yield nitrone derivatives. In this work, electrochemical behavior of nitrobenzene and benzyl alcohol derivatives was studied by cyclic voltammetry and controlled potential coulommetry. Electrochemical reactions have been performed in aqueous/ethanol (or acetonitrile) solutions by employing
Synthesis of C, N-diaryl Nitrones from the Reduction of Nitroarene with Aromatic Aldehydes Promoted by Metallic Samarium
作者:Xueshun Jia、Dafeng Li、Qing Huang、Li Zhu、Jian Li
DOI:10.3184/030823407x218057
日期:2007.5
A mild and facile reduction of nitroarene with aromatic aldehydes promoted by metallic samarium to C, N-diaryl nitrones in moderate yields has been developed.
Reactions of α,<i>N</i>-Diarylnitrones with<i>O</i>-Methyl Diphenylphosphinothioate and Oxidations of<i>N</i>-Alkylidene-2-hydroxyanilines with Silver Oxide. Preparation of Benzoxazoles
作者:Masaaki Yoshifuji、Rihei Nagase、Naoki Inamoto
DOI:10.1246/bcsj.55.873
日期:1982.3
Reactions of α,N-diarylnitrones in the presence of O-methyl diphenylphosphinothioate at 150 °C gave 2-arylbenzoxazoles (3) in fairly good yields. Oxidation of N-alkylidene-2-hydroxyanilines with silver oxide afforded 2-alkenyl-, 2-alkyl-, or 2-arylbenzoxazoles (7 and 3) in good yields under mild reaction conditions (at room temperature). A plausible mechanism for formation of 3 and 7 has been discussed
synthesis of nitronesfrom bench stable amines has been developed under constant current electrolysis at room temperature, rendering metal and external oxidant-free protocol in an alkaline medium. The electrocatalysis steps of reported strategy involve anodic oxidation of benzyl amines followed by cathodic reduction of nitro-functional group in an undivided cell affording functional nitrones. The robustness
Exploiting microwave-assisted neat procedures: synthesis of N-aryl and N-alkylnitrones and their cycloaddition en route for isoxazolidines
作者:Marta M. Andrade、Maria Teresa Barros、Rui C. Pinto
DOI:10.1016/j.tet.2008.08.101
日期:2008.11
Microwave irradiation allows increasing the speed of several reactions and also offers the possibility of eliminating poisoning organic solvents. In this work we report the microwave-assisted neat synthesis of alpha-phenyl-tert-butylnitrone (PBN) and other alkyl and aryl nitrones and also the rapid synthesis of isoxazolidines resulting from 1,3-dipolar cycloaddition of nitrones to ethyl trans-crotonate. (c) 2008 Elsevier Ltd. All rights reserved.