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Note | Regular issue | Vol 65, No. 9, 2005, pp.2181-2188
Published online, 5th August, 2005
DOI: 10.3987/COM-05-10446
Catalytic Aromatization of Hantzsch 1,4-Dihydropyridines by Bis(salicylaldehyde-1,2-phenylenediimine) Mn(III) Chloride Using Urea Hydrogen Peroxide as Mild and Efficient Oxidant

Bahador Karami,* Morteza Montazerozohori, and Masoud Nasr-Esfahani

*Department of Chemistry, Yasouj University, Yasouj 75914-353, Iran

Abstract

A variety of Hantzsch 1,4-dihyropyridines were oxidized efficiently by a catalytic amount of bis(salcylaldehyde-1,2-phenylenediimine)Mn(III) chloride (Mn(III)-salophen I) in the presence of urea hydrogen peroxide adduct (UHP II) as convenient and mild oxidant to afford the related pyridine derivatives in high yields at room temperature.