Abstract 2‐Aminobenzimidazole reacts with α,β‐unsaturated carboxylic acid chlorides or esters to give only pyrimido [1,2‐ a ] benzimidazol‐2‐(1 H ) ones. β‐Ethoxymethylenemalonie acid derivatives or β‐ketocarboxylic acid derivatives give only pyrimido [1,2‐ a ] benzimidazol‐4‐(1 H )ones. Structural assignments based on nmr and chemical manipulations are discussed.
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Chow et al. (1973) studied this question.
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