Design, synthesis and biological evaluation of 4,5-dibromo-N-(thiazol-2-yl)-1H-pyrrole-2-carboxamide derivatives as novel DNA gyrase inhibitors.

Development of novel DNA gyrase B inhibitors is an important field of antibacterial drug discovery whose aim is to introduce a more effective representative of this mechanistic class into the clinic. In the present study, two new series of Escherichia coli DNA gyrase inhibitors bearing the 4,5-dibromopyrrolamide moiety have been designed and synthesized. 4,5,6,7-Tetrahydrobenzo[1,2-d]thiazole-2,6-diamine derivatives inhibited E. coli DNA gyrase in the submicromolar to low micromolar range (IC50 values between 0.891 and 10.4μM). Their "ring-opened" analogues, based on the 2-(2-aminothiazol-4-yl)acetic acid scaffold, displayed weaker DNA gyrase inhibition with IC50 values between 15.9 and 169μM. Molecular docking experiments were conducted to study the binding modes of inhibitors.