Abstract
In this work it is described the synthesis, characterization and antimicrobial and toxicity evaluation of a series of analogs of piplartine, a piperamide found in Piper sp. The compounds structures were confirmed by infrared spectroscopy, 1H, 13C nuclear magnetic resonance, high resolution mass spectroscopy and were evaluated against strains of Candida spp., Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Derivative 24 was almost four-fold more potent (IC50: 48.83 μM) and five-fold less toxic (SI > 3) than piplartine (IC50: 189.2 μM; SI: 0.21) against Candida krusei, as well as two-fold more potent than fluconazole (IC50: 104.48 μM). This compound was also active against Candida tropicalis at 97.67 μM. Benzoyl derivative 17 was three-fold more potent (IC50: 85.2 μM) and more than five-fold less toxic (CC50: 231.71 μM) than piplartine (IC50: 315.33 μM and CC50: 41.14 μM) against Staphylococcus aureus. Given these findings, we have found analogs of piplartine which can be assumed as prototypes for the optimization and the development of new antimicrobial (compounds 24 and 17) agents.
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This work was supported by FAPEMIG (APQ-01209-13), CAPES, CNPq and FINEP.
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Fregnan, A.M., Brancaglion, G.A., Galvão, A.F.C. et al. Synthesis of piplartine analogs and preliminary findings on structure–antimicrobial activity relationship. Med Chem Res 26, 603–614 (2017). https://doi.org/10.1007/s00044-016-1774-9
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DOI: https://doi.org/10.1007/s00044-016-1774-9