Abstract
It has been established that in the reaction of 2, 4, 6-trimethylpyrylium perchlorate with 2-, 3-, and 4-aminopyridines, cytosine, adenine, guanine, and the corresponding nucleosides, and also with 2-amino-1-methylbenzimidazole, 2-amino-4-methylthiazole, 2-amino-4-phenylthiazole, 2-amino-6-bromobenzo-thiazole, and 2-amino-6-methoxybenzothiazole, either the corresponding quaternary pyridinium salt is formed or the pyrylium ring opens, depending on the basicity of the amino group.
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Dorofeenko, G.N., Narkevich, A.N., Zhdanov, Y.A. et al. Reaction of pyrylium salts with heterocyclic amines. Chem Heterocycl Compd 6, 293–295 (1970). https://doi.org/10.1007/BF00471223
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DOI: https://doi.org/10.1007/BF00471223