The Studies on Quinolizinium Salts. I. Syntheses of Quinolizinium and 1-, 2-, 3-, and 4-Methylquinolizinium Bromides

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Quinolizinium bromide (IVa) was prepared in good yield from commercially available ethyl picolinate and γ-butyrolactone. This synthetic route is convenient for synthesis of the parent compound (VIa) and was extended to preparations of the monomethyl derivatives (IVb∼d, VII).