Abstract
Abstract It was found that various 1-alkyl-2-(1a–d) and 4-picolinium salts(5a,b) react smoothly with ethoxymethylene compounds(2a–c) activated by electron-withdrawing substituents in the presence of alkali to give the corresponding 1-alkyl-2-(4a–i) and 4-allylidenedihydropyridine derivatives(6a–d) in fairly good yields. 1-Methyl-2-(vinylimino)dihydropyridine(8a) and pyrimidine(8b) were obtained by the reactions of 1-methyl-2-aminopyridinium(7a) and pyrimidinium iodide (7b) with ethyl ethoxymethylenecyanoacetate(2a) under similar reaction conditions.
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