Abstract
Electrochemical reduction of N-(2-nitroaryl)pyridinium chlorides was accomplished in acidic aqueous alcoholic medium in the galvanostatic mode using tin, titanium, vanadium, and iron chlorides as redox-mediators. The use of SnCl2 as a mediator catalyst made it possible to shorten the electrosynthesis time as compared to the direct electroreduction on an electrode and prepare the intramolecular cyclization products, viz., substituted pyrido[1,2-a]benzimidazoles, in high yield. The influence of the mediator nature and its amount, current density, temperature, cathode material, medium acidity, and the substrate structure on the efficiency of reductive heterocyclization of N-(2-nitroaryl)pyridinium salts was studied.
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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 0209—0214, January, 2016.
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Sokolov, A.A., Begunov, R.S., Syroeshkin, M.A. et al. Electrochemical reduction of N-(2-nitro-4-R-phenyl)pyridinium salts using redox-mediators. Russ Chem Bull 65, 209–214 (2016). https://doi.org/10.1007/s11172-016-1286-2
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DOI: https://doi.org/10.1007/s11172-016-1286-2