Paper
Cobalt- and iron-catalyzed redox condensation of o-substituted nitrobenzenes with alkylamines: a step- and redox-economical synthesis of diazaheterocycles.
Published Nov 14, 2013 · T. Nguyen, Julie le Bescont, L. Ermolenko
Organic letters
103
Citations
2
Influential Citations
Abstract
A wide variety of functionalized 2-aryl benzimidazoles can be prepared by a solvent-free cobalt- or iron-catalyzed redox condensation of 2-nitroanilines and benzylamines. The cascade including benzylamine oxidation, nitro reduction, condensation, and aromatization occurs without any added reducing or oxidizing agent. The method can be extended to other alkylamines as reducing components or 2-nitrobenzamides as oxidizing components when using an iron/sulfur catalyst to afford various diazaheterocycles.
This study presents a solvent-free, redox-economical method for preparing functionalized 2-aryl benzimidazoles using 2-nitroanilines and benzylamines, with potential applications in various diazaheterocycles.
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