Synthesis and Kinetic Testing of Tetrahydropyrimidine‐2‐thione and Pyrrole Derivatives as Inhibitors of the Metallo‐β‐lactamase from <i>Klebsiella pneumonia</i> and <i>Pseudomonas aeruginosa</i>

Abstract

Metallo-β-lactamases (MBLs), produced by an increasing number of bacterial pathogens, facilitate the hydrolysis of many commonly used β-lactam antibiotics. There are no clinically useful antagonists against MBLs. Two sets of tetrahydropyrimidine-2-thione and pyrrole derivatives were synthesized and assayed for their inhibitory effects on the catalytic activity of the IMP-1 MBL from Pseudomonas aeruginosa and Klebsiella pneumoniae. Nine compounds tested (1a, 3b, 5c, 6b, 7a, 8a, 11c, 13a, and 16a) showed micromolar inhibition constants (K(i) values range from ∼20-80 μM). Compounds 1c, 2b, and 15a showed only weak inhibition. In silico docking was employed to investigate the binding mode of each enantiomer of the strongest inhibitor, 5c (K(i) = 19 ± 9 μM), as well as 7a (K(i) =21 ± 10 μM), the strongest inhibitor of the pyrrole series, in the active site of IMP-1.