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Updated: May 16, 2025

Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
Published on: January 3, 2018
Tuning Tetrazine Substituents to Enhance Vinyltetrazine Labeling Performance
Xinxin Liang1, Jie Li1, Xinyu He1
1Department of Radiology and Huaxi MR Research Center (HMRRC), Functional and Molecular Imaging Key Laboratory of Sichuan Province and Frontiers Science Center for Disease Related Molecular Network, West China Hospital, Sichuan University, Chengdu, 610041, China.
Vinyltetrazine, a thiol-specific labeling reagent, enables dual-modality imaging and improves peptide drug delivery. Modifications to vinyltetrazine enhance labeling efficiency, kinetics, and stability for advanced applications.
Area of Science:
- Chemical Biology
- Bioconjugation Chemistry
- Molecular Imaging
Background:
- Site-specific labeling of peptides and proteins is crucial for understanding biological processes.
- Thiol-specific labeling reagents are valuable tools in chemical biology.
- Dual-modality imaging offers enhanced diagnostic capabilities.
Purpose of the Study:
- To investigate the utility of vinyltetrazine as a thiol-specific labeling reagent for prodrug activation.
- To explore the impact of 3-position tetrazine substitutions on labeling efficiency, bioorthogonal kinetics, and stability.
- To assess the potential of vinyltetrazine labeling for dual-modality imaging and improved cellular uptake of peptide conjugates.
Main Methods:
- Synthesis and characterization of six vinyltetrazines with varied 3-position modifications.
- Evaluation of labeling efficiency and bioorthogonal kinetics with target peptides.
- Assessment of stability and impact on peptide physicochemical properties (charge, lipophilicity).
- Demonstration of dual-modality imaging (18F and near-infrared) capabilities.
Main Results:
- Six vinyltetrazine derivatives demonstrated rapid labeling, rapid bioorthogonal kinetics, and excellent stability.
- Vinyltetrazine labeling altered peptide charge and lipophilicity, enhancing cellular uptake.
- The reagent successfully enabled 18F and near-infrared dual-modality imaging.
Conclusions:
- Tuning tetrazine substituents significantly impacts labeling performance and bioorthogonal properties.
- Vinyltetrazine is a versatile reagent for peptide modification, improving cellular delivery and enabling dual-modality imaging.
- This work lays the foundation for a comprehensive vinyltetrazine library for developing novel peptide conjugates and pretargeted immuno-PET imaging agents.
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