Over the past decade, WHO has declared the emergence of multi-drug resistant bacteria as a global public health problem. In this situation, search for new bacterial enzymatic targets and development of selectively active molecules has become a key issue. In recent years, discovery of a new enzymatic target belonging to the Thymidilate synthase family by Myllykalio's team and its comprehensive study make it a promising target in the design of new active molecules. Absent in humans, present in many pathogens with many resistances, with a different structure and mechanism involving an oxydo-reducing NADPH/FAD couple, this enzyme would allow selective inhibition of pathogenic bacteria. In this manuscript, it is described at first the synthesis ...