A method for the synthesis of 2-alkylquinolizinium salts is described, using 2-(4-ethoxybutanoyl)pyridine. Condensation of 1,2,3,4-tetrahydro-1-oxoquinolizinium bromide with aromatic aldehydes gives products of the type arylmethylenedi-(3,4-dihydro-1-hydroxyquinolizinium) dihalide.
T. L. Hough and G. Jones, J. Chem. Soc. C, 1967, 1112 DOI: 10.1039/J39670001112
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