Kanamycins A and B react with a variety of water-soluble pyrylium ions in aqueous solution specifically at the 6′-primary-alkyl primary amine functions to give the corresponding pyridinium ions in high yield. Neomycin also reacts at only one amino group. Products were characterised by 13C n.m.r. and elemental analysis.
A. R. Katritzky, Y. Yang, J. Ellison and J. Marquet, J. Chem. Soc., Perkin Trans. 2, 1984, 879 DOI: 10.1039/P29840000879
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