The synthesis of 1-aminoimidazo[1,2-a]pyridinium salts by cyclisation of the quaternary salts derived from 2-pyridyl-acethydrazide and suitable bromo-aldehydes or ketones and their oxidation to the title compounds is described.
E. E. Glover and M. Yorke, J. Chem. Soc. C, 1971, 3280 DOI: 10.1039/J39710003280
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