Abstract
Discovery of β-lactamase inhibitors is a continuous process due to inherent capability of resistance in bacteria against existing inhibitors. Diazabicyclooctane ring is a non-β-lactam motif capable of inhibiting the β-lactamases. As part of our efforts, we synthesized a series of diazabicyclooctane derivatives where C2 position of the bicyclic ring is linked with various substituted-amidine moieties. The newly synthesized compounds, alone and in combination with meropenem, were tested against ten bacterial strains for their antibacterial activity in vitro. All compounds did not show antibacterial tendency when tested alone (MIC > 64 mg/dm3) however, showed antibacterial activity in combination with meropenem. All compounds enhanced the potency of meropenem (MIC 2–4 mg/dm3) with MIC values ranging from < 0.125 to 1 mg/dm3 indicating their prospective β-lactamase inhibition capability. One derivative proved to be the most potent among all, and is comparable to avibactam, against eight out of ten bacterial strains.
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Acknowledgements
Authors thank Ministry of Science and Technology, P.R. China for the award of foreign expert program to Dr. Haikang Yang and Dr. Zafar Iqbal. This work was supported by the grant from Science and Technology Department of Ningxia, P.R. China (No. 2018BCG01001).
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Liu, Y., Ji, J., Sun, J. et al. Substituted-amidine derivatives of diazabicyclooctane as prospective β-lactamase inhibitors. Monatsh Chem 153, 301–309 (2022). https://doi.org/10.1007/s00706-021-02888-3
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DOI: https://doi.org/10.1007/s00706-021-02888-3