Facile synthesis and biological activity of sulfonate ester-containing imidazolylpyridine, imidazo(4,5-b)pyridine and imidazo(5',1':2,3)imidazo(4,5-b)pyridine derivatives

Different ring systems containing imidazole and/or pyridine moieties and accomodating sulfonate ester moiety in their structure were prepared via ring opening of 2-oxazolin-5-one derivatives under various reaction conditions. The assigned structures for the prepared compounds were established through elemental analysis, spectral data and if possible by alternative synthetic routes. The antimicrobial activity of the synthesized compounds was also investigated.