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A facile method for the rapid synthesis of benzoacridines has been described. This protocol promoted by p‐toluenesulfonic acid starts from aromatic aldehydes and N‐phenyl naphthylamines, affording a variety of benzoacridines in 30–90 % yields under metal‐free conditions. The present approach involves a cascade of condensation, Friedel‐Crafts alkylation, annulation and dehydroaromatization in one pot.
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