Related Experiment Video
Updated: Jun 27, 2026
05:07
Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
Published on: June 23, 2019
Novel pyridazine derivatives: Synthesis and antimicrobial activity evaluation
N G Kandile1, M I Mohamed, H Zaky
1Chemistry Department, Faculty of Women, Ain Shams University, Heliopolis Cairo 11757, Egypt.
European Journal of Medicinal Chemistry
|November 18, 2008
Summary
Researchers developed a new method to synthesize novel hydrazone derivatives. The compound 15(d) exhibited significant antimicrobial activity, showing promise for new therapeutic applications.
Area of Science:
- Organic Chemistry
- Medicinal Chemistry
Background:
- Hydrazones are versatile compounds with diverse biological activities.
- Pyridazine derivatives have shown potential in various therapeutic areas.
Purpose of the Study:
- To synthesize novel hydrazone derivatives using a general method.
- To evaluate the antimicrobial potential of the synthesized compounds.
Main Methods:
- Condensation reactions between pyridazin-3(2H)-ylidene hydrazines and various carbonyl compounds/carbohydrates.
- Structural confirmation using microanalytical and spectral data (e.g., NMR, IR, Mass Spectrometry).
- Antimicrobial screening against Gram-positive (Staphylococcus aureus, Streptococcus faecalis) and Gram-negative (Escherichia coli, Pseudomonas aeruginosa) bacteria.
Main Results:
- A series of novel hydrazone and dihydrazone derivatives were successfully synthesized.
- The structures of all synthesized compounds were confirmed.
- Compound 15(d) demonstrated the highest antimicrobial activity against the tested bacterial strains.
Conclusions:
- The reported method provides a facile route to new hydrazone derivatives.
- The synthesized hydrazones hold potential as antimicrobial agents.
- Further investigation into compound 15(d) is warranted for drug development.
Related Concept Videos
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
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 position.
01:22Antiviral Nucleoside Inhibitors
Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...
01:25Basicity of Heterocyclic Aromatic Amines
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).
01:28Inhibitors of Bacterial DNA Synthesis
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 antibiotics are selectively...
01:28Antimicrobial Effectiveness
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...
01:21Antiprotozoal Agents
Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...