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Area of Science:

  • Radiochemistry
  • Organic Synthesis
  • Molecular Imaging

Background:

  • Positron emission tomography (PET) imaging requires efficient synthesis of radiotracers.
  • Current methods for PET agent assembly can be complex and time-consuming.
  • Modularity in radiotracer design is crucial for optimizing pharmacokinetic properties.

Purpose of the Study:

  • To develop an efficient and modular strategy for the rapid assembly of novel PET agents.
  • To demonstrate a combinatorial approach for linking positron emitters with targeting ligands.
  • To showcase the adaptability of the strategy for tuning agent properties.

Main Methods:

  • Utilized a sequential, rapid, and selective double-click reaction strategy.
  • Employed strain-promoted azide alkyne cyclization (SPAAC) for initial coupling.
  • Incorporated a photocleavable protecting group on a cyclooctadiyne (MC-DIBOD) for sequential functionalization.
  • Demonstrated modularity by modifying hydrophilicity of PSMA PET agents.

Main Results:

  • Successfully assembled various PET agents using the developed modular strategy.
  • The SPAAC reaction formed a stable intermediate with an 18F-labeled azide synthon.
  • Photochemical deprotection of MC-DIBOD enabled subsequent azide-biomolecule conjugation.
  • Modification of hydrophilicity in PSMA PET agents improved tumor-to-background contrast.

Conclusions:

  • The developed modular strategy offers an efficient and rapid method for PET agent synthesis.
  • The sequential click chemistry approach allows for combinatorial library generation.
  • This strategy facilitates facile optimization of PET agents for enhanced diagnostic performance.