Syntheses and in vitro antimicrobial activities of thiazolo-[3,2-a]benzimidazol-3(2H)-ones

Taking advantage of the nucleophilic reactivity of the 2-methylene carbon atom in thiazolo[3,2-a]-benzimidazol-3(2H)-one, a number of 2-isatinylidene and 2-arylazo derivatives have been prepared. The novel compounds were subjected to antimicrobial testing.