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2-R-Pyridines (RCN, CHNOH and COMe) with phenacyl bromide gave the corresponding quaternary bicyclic ring system containing one ring junction nitrogen and one extra nitrogen or oxygen atom (1–3). Their structures were confirmed by 1 H, 13 C and 15 NMR spectra in DMSO-d 6 solution using 2D NMR techniques (COSY, NEOSY, HETCOR and HMBC). The structure of 1-oxo-3-phenyl-pyrido[1,2a]pyrazinium...
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