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Related Concept Videos

Antifungal Agents01:15

Antifungal Agents

97
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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Anthelminthic Agents01:15

Anthelminthic Agents

89
Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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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...
4.2K
Inhibitors of Bacterial DNA Synthesis01:28

Inhibitors of Bacterial DNA Synthesis

89
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...
89
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

7.2K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
7.2K
Inhibitors of Bacterial Protein Synthesis01:25

Inhibitors of Bacterial Protein Synthesis

76
Aminoglycosides constitute a highly potent class of bactericidal antibiotics that exert their antimicrobial effects by targeting the bacterial ribosome, specifically disrupting protein synthesis. These polycationic molecules consist of amino-modified sugars linked via glycosidic bonds to an aminocyclitol core such as 2-deoxystreptamine or streptamine. Their strong positive charges facilitate tight binding to the negatively charged phosphate backbone of ribosomal RNA (rRNA), primarily at the 16S...
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Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
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Recent progress on pyrazole scaffold-based antimycobacterial agents.

Rangappa S Keri1, Karam Chand, Thippeswamy Ramakrishnappa

  • 1Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Bangalore, Karnataka, India; Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal.

Archiv Der Pharmazie
|March 31, 2015
PubMed
Summary

New research explores pyrazole compounds as novel therapeutic agents against tuberculosis (TB). This review synthesizes structure-activity relationships to guide the development of more effective and less toxic anti-TB drugs.

Keywords:
Anti-tubercularMedicinal chemistryMycobacterium tuberculosisPyrazoleSynthesisTubercle bacillus

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Area of Science:

  • Medicinal Chemistry
  • Drug Discovery
  • Organic Chemistry

Background:

  • Infectious diseases, particularly tuberculosis (TB), remain a leading global cause of mortality.
  • Emerging antibiotic resistance necessitates novel therapeutic strategies against Mycobacterium tuberculosis.
  • Pyrazole heterocycles exhibit diverse biological activities, making them promising scaffolds for drug development.

Purpose of the Study:

  • To review and synthesize current research on pyrazole derivatives for antitubercular applications.
  • To provide insights into structure-activity relationships for designing improved anti-TB agents.
  • To guide future rational design of pyrazole-based drugs with enhanced efficacy and reduced toxicity.

Main Methods:

  • Comprehensive literature review of published reports on pyrazole analogs.
  • Analysis of structure-activity relationships (SAR) for antitubercular activity.
  • Collating information on pyrazole's therapeutic potential against tuberculosis.

Main Results:

  • Pyrazole derivatives show significant potential as anti-TB agents.
  • Understanding SAR is crucial for optimizing pyrazole-based drug design.
  • This review consolidates existing knowledge to facilitate further research.

Conclusions:

  • Pyrazole scaffolds offer a promising avenue for developing new antitubercular drugs.
  • Further research into pyrazole analogs can lead to more effective treatments for tuberculosis.
  • Rational drug design based on SAR can accelerate the discovery of novel anti-TB therapies.