The major products of the propiolate reactions are pyrimido[1,2-a]benzimidazol-2-ones and those of the malonate reactions are pyrimido[1,2-a]benzimidazol-4-ones. The 1H n.m.r., i.r., and u.v. spectra of the products are discussed.
D. W. Dunwell and D. Evans, J. Chem. Soc., Perkin Trans. 1, 1973, 1588 DOI: 10.1039/P19730001588
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