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The pyrazole ring represents a widely applied chemical scaffold in medicinal chemistry research and we have observed that the physicochemical and biological features of highly substituted pyrazoles can be successfully improved by their encapsulation in dendrimer nanoparticles (NPs). For the future development of new optimized antibacterial delivery systems, we report the synthesis and biological evaluation of 5-amino functionalized pyrazole library (compounds 2 - 7 ). In detail, new derivatives 2 - 7 were differently decorated in C3, C4 and C5 positions. An in silico study predicted pyrazoles 2 - 7 to exert good drug-like and pharmacokinetic properties. Compounds 3c and 4b were endowed with moderate, but nanotechnologically improvable activity against multidrug-resistant (MDR) clinical isolates of Gram-positive species, especially of the Staphylococcus genus (MICs = 32-64 µg/mL). In addition, derivatives 3c and 4a showed moderate activities against Mycobacterium tuberculosis and 4a evidenced activity also against MDR strains. Overall, the collected evidence supported that, upon nano-formulation with proper polymer matrices, the new synthesized compounds could provide new pyrazole-based drug delivery systems with an enhanced and enlarged-spectrum of antibacterial activity.

Microbiological Screening of 5-Functionalized Pyrazoles for the Future Development of Optimized Pyrazole-Based Delivery Systems