Abstract Reactions of the substituted 2-formyl chromones with aroylhydrazines gave corresponding 2-(aroylhydrazonomethylidyne) chromones. Then 2-(3′-acetyl-5′-aryl-2′, 3′-dihydro-1′, 3′, 4′-oxadiazol-2′-yl) chromones were prepared by these 2-( aroylhydrazonomethylidyne) chromones under refluxing with Ac 2 O. All target compounds were characterized through elemental analysis and IR, 1 H NMR, MS.
