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Related Concept Videos

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.

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Related Experiment Video

Updated: May 15, 2026

Microwave-assisted One-pot Synthesis of N-succinimidyl-4-[18F]fluorobenzoate ([18F]SFB)
08:33

Microwave-assisted One-pot Synthesis of N-succinimidyl-4-[18F]fluorobenzoate ([18F]SFB)

Published on: June 28, 2011

A convenient chemical-microbial method for developing fluorinated pharmaceuticals.

Tara V Bright1, Fay Dalton, Victoria L Elder

  • 1UCD School of Biomolecular and Biomedical Science, Centre for Synthesis and Chemical Biology, University College Dublin, Ardmore House, Belfield, Dublin 4, Ireland.

Organic & Biomolecular Chemistry
|January 10, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for drug development, using microbial oxidation to identify optimal sites for fluorine incorporation in drug molecules. This approach enhances metabolic stability and reduces the need for animal testing.

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Area of Science:

  • Medicinal Chemistry
  • Drug Development
  • Biocatalysis

Background:

  • Fluorine incorporation is crucial for enhancing pharmaceutical properties, including metabolic stability.
  • Identifying optimal fluorination sites is key to effective drug design.
  • Microbial oxidation offers a promising in vitro method to predict metabolic pathways.

Purpose of the Study:

  • To develop a general method for selecting optimal sites for fluorine incorporation in pro-drug molecules.
  • To improve the metabolic stability of drug candidates through strategic fluorination.
  • To utilize microbial oxidation as a predictive tool for chemical fluorination.

Main Methods:

  • Model biphenyl derivatives were incubated with Cunninghamella elegans and Streptomyces griseus to determine oxidation sites.
  • Fluorinated biphenyl derivatives were synthesized via Suzuki-Miyaura coupling at identified oxidation sites.
  • The metabolic stability of fluorinated compounds was assessed by incubating them with the same microorganisms.

Main Results:

  • Microbial oxidation successfully identified sites susceptible to metabolic attack.
  • Biphenyl-4-carboxylic acid was fully transformed to its hydroxylated analog by C. elegans, while its 4'-fluoro analog remained untransformed.
  • Fluorination at identified sites significantly altered or halted microbial transformation, demonstrating the concept's efficacy.

Conclusions:

  • A predictive method for site-selective fluorination was established using microbial oxidation.
  • This strategy enables the iterative design of drug candidates with enhanced metabolic half-lives.
  • The approach minimizes the necessity for extensive animal studies in early drug development.