Schiff bases 2–6 obtained from 2-aminobenzimidazole 1 with p-(N,N-diethylamino)-, p-chloro-, p-bromo-, 2,4-dimethoxy-, and 3,4-dimethoxybenzaldehyde were subjected to the reaction with 1,3-ketoester: methyl-, ethyl-, benzyl-, and t-butylacetoacetate to form derivatives of pyrimido[1,2-a]benzimidazole 7–23. 1H NMR spectra recorded for the compounds 20–23 in DMSO solution indicate the presence of two conformational forms. Compounds 2, 7–23 were examined for their antiproliferative activity in vitro against the cells of human lung cancer cell lines A549.
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