A new benzothiazole derivatives 4a-f were prepared by the reaction of 2-cyanomethylbenzothiazole 1 with 2-hydroxy-5-(aryldiazenyl)benzaldehyde derivatives 2a-f under thermal method in ethanol containing few drops of triethylamine. The previous reaction was reinvestigated at room temperature using grindstone technique using sodium hydroxide. The compounds 4a-f were transformed into benzothiazole-bearing coumarin derivatives 5a-f by refluxing in dioxane with few drops of conc. hydrochloric acid. The structure of the newly synthesized compounds 4a-f and 5a-f was established by spectral data. The compounds 5a-f showed fluorescence properties as well as antimicrobial activity.
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