Oxidative and Basic Transformations of Some 1-Heteroaryloligophenylpyridinium Salts. Limitations to the Applicability of Ferricyanide Oxidation

1 January 1992

journal article
Published by Institute of Organic Chemistry & Biochemistry in Collection of Czechoslovak Chemical Communications

Vol. 57 (8) , 1672-1683
https://doi.org/10.1135/cccc19921672

Abstract

Ferricyanide oxidation of 2,3,4,6-tetraphenyl-1-(2'-pyridyl)pyridinium perchlorate (III) gave, in addition to the biheterocyclic product Ib, two pyrrole derivatives IIb and IIc and in some conditions also the diketone IV. Additional pyrrole derivatives, VII and IX, were obtained analogously from the thiazole 2,4,6-triphenylpyridinium salts V and VIb. Alkalysis of the thiazole salts V and VIb and of the imidazole salts VIc and VId using alcoholic KOH afforded the biheterocyclic products XI-XIV. The mechanisms of the conversions involved are discussed.

Keywords

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