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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to...
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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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Thiazide diuretics are sulfonamide derivatives featuring a benzothiadiazine ring system in their molecular structure. Based on this structure, thiazide diuretics can be categorized into two groups: thiazide-type and thiazide-like diuretics. Thiazide-type diuretics, including hydrochlorothiazide and chlorothiazide, consist of a benzothiadiazine backbone with an attached sulfonamide group. Thiazide-like diuretics, such as chlorthalidone and indapamide, lack the thiazide ring but demonstrate...
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The oxadiazole antibacterials.

Jeshina Janardhanan1, Mayland Chang1, Shahriar Mobashery1

  • 1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States.

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New oxadiazole antibacterials show potent activity against Gram-positive bacteria, including MRSA and VRE. These bactericidal drugs are orally bioavailable and effective in mouse models, offering promise for treating infections.

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Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Drug Discovery

Background:

  • Penicillin-binding proteins are crucial targets for antibacterial development.
  • Emerging antibiotic resistance necessitates novel therapeutic strategies.
  • Gram-positive bacterial infections, including MRSA and VRE, pose significant public health challenges.

Purpose of the Study:

  • To discover and characterize novel antibacterial compounds targeting penicillin-binding proteins.
  • To evaluate the in vitro and in vivo efficacy of oxadiazole antibacterials.
  • To assess the pharmacokinetic properties of oxadiazoles for potential therapeutic use.

Main Methods:

  • In silico molecular docking and scoring against penicillin-binding protein structures.
  • In vitro susceptibility testing against Gram-positive bacterial strains (MRSA, VRE).
  • In vivo efficacy studies in murine models of peritonitis/sepsis and MRSA thigh infection.

Main Results:

  • Oxadiazoles identified through in silico screening exhibit potent activity against Gram-positive bacteria.
  • Compounds demonstrated efficacy in preclinical murine models of infection.
  • Oxadiazoles are bactericidal, orally bioavailable, and show promise for treating MRSA infections.

Conclusions:

  • Oxadiazoles represent a promising new class of antibacterials.
  • These compounds are effective against challenging Gram-positive pathogens.
  • Oxadiazoles warrant further investigation for clinical development against resistant bacterial infections.