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A divergent and regioselective cyclocondensation reaction of β‐enamino diketones with 2‐aminobenzimidazole is reported. The β‐enamino diketones react with 2‐aminobenzimidazole to form exclusively 1,2‐ or 1,4‐regioisomers of benzo[4,5]imidazo[1,2‐a]pyrimidines, depending on the nature of the EWG group in the diketones: when the diketone has a carboxyethyl group, only the 1,2‐regioisomer was obtained;...
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