The ever increasing cases of microbial resistance pose a major threat to the scientific community and therefore the need for discovery and development of newer antimicrobial agents with novel mode of action is becoming critical. One of the ways to tackle this herculean problem is to generate hybrid molecules by combining two or more bioactive heterocyclic moieties in a single molecular platform. The review here describes published results of our research group's endeavors towards development of potential new and safe antimicrobial agents with better effectiveness by using the hybrid approach. In the present review article the landscaping of heterocycles like 4-thiazolidinones, benzimidazole and quinoline are described. Compounds displaying two of more fold antimicrobial activity are included in the review.

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A series of 2-(2-chloroquinolin-3-yl)-5-((aryl)benzylidene)-3-(4-oxo-2-phenylquinazolin-3(4H)-yl)thiazolidin-4-ones (V) 1-12 have been synthesized. In order to establish optimization of different parameters of chemical transformation, that is the reaction pathway for each step and reaction conditions in the each step, in the present paper, different solvents and catalysts were used. The structures of the synthesized compounds were assigned on the basis of elemental analysis, IR, 1 H NMR and 13 C NMR spectral data. All the newly synthesized compounds were screened against various strains of bacteria and fungi. ª 2011 King Saud University. Production and hosting by Elsevier B.V.

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