Abstract
AbstractBase catalysed condensation of a substituted 2‐hydroxyacetophenone with acetic anhydride and sodium acetate followed by cyclization of the intermediate with acid gave substituted 3‐acetyl‐2‐methyl‐4H‐1‐benzopyran‐4‐ones. These were then brominated with phenyltrimethylammonium tribromide (PTT) to yield the desired 3‐(2‐bromoacetyl)benzopyran‐4‐ones. The latter compound on treatment with primary and secondary aryl or alkyl amines, gave the corresponding benzopyran‐4‐one derivatives.
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