ChemInform Abstract: Sterically Crowded Heterocycles. Part 3. A General Approach to Imidazo( 1,2-a)pyridines by Ferricyanide Oxidation of Quaternary Pyridinium Salts.
Abstract
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ChemInform Abstract
The ferricyanide oxidation of the pyridinium salts (III) provides mixtures of major imidazopyridines (IV) and minor isomeric pyrroles (V) while the derivatives (VIII) give exclusively the corresponding imidazopyridine (IX).