Abstract
The reaction of β-ethoxyvinylpyrylium salts with primary aromatic amines gives β-R-aminovinylpyrylium salts, the alkaline hydrolysis of which gives azomethines and, subsequently, pyranylideneacetaldehydes; reaction with methylamine gives N-methylpyridinium salts, which, under the influence of alkali, give pyridinylideneacetaldehydes, while reaction with secondary amines gives β-R,R′-dialkylaminovinylpyrylium salts or acetalacylals; reaction with acetate gives hydroxyvinylpyridines.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1338–1343, October, 1974.
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Dorofeenko, G.N., Mezheritskii, V.V. & Vasserman, A.L. Reaction of ethoxyvinyl derivatives of pyrylium and pyridinium salts with primary and secondary amines. Chem Heterocycl Compd 10, 1166–1171 (1974). https://doi.org/10.1007/BF00470156
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DOI: https://doi.org/10.1007/BF00470156