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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