Laboratory control of antimicrobial therapy

The increasing threat of antimicrobial resistance to all currently available therapeutic agents has urged the development of novel antimicrobials. In this context, a series of new benzoylthiourea derivatives substituted with one or more fluorine atoms and with the trifluoromethyl group have been tested, synthesized, and characterized by IR, NMR, CHNS and crystal X-ray diffraction. The molecular docking has provided information regarding the binding affinity and the orientation of the new compounds to Escherichia coli DNA gyrase B. The docking score predicted the antimicrobial activity of the studied compounds, especially against E. coli, which was further demonstrated experimentally against planktonic and biofilm embedded bacterial and fungal cells. The compounds bearing one fluorine atom on the phenyl ring have shown the best antibacterial effect, while those with three fluorine atoms exhibited the most intensive antifungal activity. All tested compounds exhibited antibiofilm activity, correlated with the trifluoromethyl substituent, most favorable in para position.

https://www.mdpi.com/1420-3049/25/7/1478/pdf

New Substituted Benzoylthiourea Derivatives: From Design to Antimicrobial Applications

Multiple molecular targets mediated antioxidant activity, molecular docking, ADMET, QSAR and bioactivity studies of halo substituted urea derivatives of α-Methyl-l-DOPA.

A new rhodamine spirolactam derivative as a naked-eye and fluorescent chemosensor (1) for copper(II) with excellent antijamming capability was synthesized by using 1-(pyrazin-2-yl)hydrazine and rhodamine B as starting materials. Introducing of pyrazinyl hydrazine increased its solubility in water. In the presence of Cu2+, the solution color of 1 changed from colorless to amaranth. At the same time, a strong fluorescence at 575 nm was turned on. The absolute fluorescence quantum yield of 1 without or with two equivalents of Cu2+ was increased from 0.010 to 0.298. The limit of detection was determined to be 89.9 nM. The stoichiometry between 1 and Cu2+ was determined 1:2 through job’s plot. Based on the results of mass spectra, absorption and fluorescence spectra, as well as the theoretical calculations, a ring-opening process of the spirolactam form of 1 induced by Cu2+and further hydrolysis was proposed. The colorimetric test strips were made for 1 to recognize Cu2+ quickly and conveniently. Furthermore, 1 was applied to image Cu2+ in HepG2 living cells.

A new naked-eye fluorescent chemosensor for Cu(II) and its practical applications

New dimensions in triazolo[4,3-a]pyrazine derivatives: The land of opportunity in organic and medicinal chemistry

An efficient and robust synthetic procedure was developed primarily for the synthesis of a precursor compound; 3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1, 2, 4]triazolo[4,3-a]pyrazine (11), from 2-c...

Urea and thiourea derivatives of 3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1, 2, 4]triazolo[4,3-a]pyrazine: Synthesis, characterization, antimicrobial activity and docking studies

Raja Sekhara P. Kottapalli

Papers

Urea and thiourea derivatives of 3-(trifluoromethyl)-5,6,7,8-tetrahydro-[1, 2, 4]triazolo[4,3-a]pyrazine: Synthesis, characterization, antimicrobial activity and docking studies