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On the isomerisation of cefozopran in solution
Shu-Yu Liu1, Dou-Sheng Zhang, Chang-Qin Hu
1Shanghai University of Engineering Science, Shanghai 201620, People's Republic of China.
Cefozopran exists in two configurations, with the cis-isomer exhibiting superior antimicrobial activity compared to the trans-isomer. This study elucidates their structures and stability, offering insights into cephalosporin configuration-activity relationships.
Area of Science:
- Medicinal Chemistry
- Organic Chemistry
- Microbiology
Background:
- Cephalosporins are a vital class of antibiotics.
- Understanding the stereochemistry of cephalosporins is crucial for optimizing their therapeutic efficacy.
- Cefozopran is a cephalosporin antibiotic with potential for isomeric variations.
Purpose of the Study:
- To describe and characterize the two configurations of cefozopran.
- To determine the molecular structure and spatial arrangement of cefozopran isomers.
- To evaluate the stability and biological activity of cefozopran configurations.
Main Methods:
- Liquid chromatography coupled with mass spectrometry (LC-MS) for structural determination.
- Nuclear magnetic resonance (NMR) spectroscopy with liquid chromatography for spatial structure analysis.
- Optical rotation detection and molecular docking for mechanism and activity assessment.
Main Results:
- Cefozopran was found to exist in two distinct configurations in aqueous acetonitrile solution.
- The spatial structures and interconversion mechanisms of both cis- and trans-isomers were elucidated.
- The cis-isomer demonstrated significantly higher antimicrobial activity than the trans-isomer.
Conclusions:
- Cefozopran exhibits isomerism, with distinct cis and trans configurations.
- The cis-isomer of cefozopran possesses enhanced biological activity.
- Stereochemical configuration is a critical determinant of cefozopran's antimicrobial potency.
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