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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
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A Riboflavin-Derived Flavinium Salt Mediates Chemoselective Methylation Reactions.

Tim Langschwager1, Ekrem Suylu1, Julian Zuber1

  • 1Technical University of Munich (TUM), Garching, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 22, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new flavin-mediated methylation method using methyl diphenylphosphinite. This approach offers a safer, more selective, and atom-economical alternative to traditional methylation techniques in synthetic chemistry.

Keywords:
chemoselective functionalizationflavin Chemistrymethylationorganic cofactorsredox condensation

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Area of Science:

  • Synthetic Organic Chemistry
  • Medicinal Chemistry
  • Green Chemistry

Background:

  • Selective methylation is crucial for synthesizing drug molecules.
  • Traditional methylation reagents pose safety hazards and lack chemoselectivity.
  • Existing mediator-controlled methods suffer from poor atom economy due to mediator loss.

Purpose of the Study:

  • To develop a novel, efficient, and sustainable methylation strategy.
  • To overcome the limitations of current methylation methods.
  • To provide a chemoselective and atom-economical approach for methyl group installation.

Main Methods:

  • Developed a flavin-mediated methylation strategy.
  • Utilized methyl diphenylphosphinite as the methyl group source.
  • Employed a two-step procedure with mediator recovery via acidic treatment and air oxidation.

Main Results:

  • Achieved chemoselective methylation of diverse organic substrates.
  • Demonstrated successful trideuteromethylation.
  • Successfully methylated complex molecules like venetoclax and nevirapine.
  • Flavin mediator was efficiently recovered and reused.

Conclusions:

  • The developed flavin-mediated methylation is a sustainable and effective alternative.
  • The methodology shows promise for broader applications in alkylation reactions.
  • Potential for selective modification of nucleobases in future research.