Some 1,2-disubstituted benzimidazoles with dimethyl acetylenedicarboxylate gave pyrido[1,2-a]benzimidazoles, azepino[1,2-a]benzimidazoles, and pyrrolo[1,2-a]benzimidazoles, identified from their u.v., mass, and n.m.r. spectra.
R. M. Acheson and M. S. Verlander, J. Chem. Soc., Perkin Trans. 1, 1974, 430 DOI: 10.1039/P19740000430
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