Abstract
A method of synthesizing pyrylium salts with heterocyclic substituents in the ring, has been investigated. The synthesis was carried out in two stages: alkaline condensation of aromatic and heterocyclic aldehydes with methyl ketones to give 1, 5-diketones, followed by cyclization to pyrylium salts by treatment with triphenylmethyl perchlorate. Pyridines containing heterocyclic substituents were obtained by treating the pyrylium salts with ammonia.
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References
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Dorofeenko, G.N., Korol'chenko, G.A. & Krivun, S.V. Synthesis of pyrylium salts and pyridines containing heterocyclic substituents. Chem Heterocycl Compd 1, 551–554 (1966). https://doi.org/10.1007/BF00472687
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DOI: https://doi.org/10.1007/BF00472687