trans-Cyclooctene--a stable, voracious dienophile for bioorthogonal labeling

Area of Science:

• Bioorthogonal chemistry
• Organic chemistry
• Chemical biology

Background:

• Bioorthogonal labeling is crucial for studying biological systems.
• Strained alkenes react with tetrazines for labeling applications.
• Existing methods have limitations in reactivity and concentration.

Purpose of the Study:

• To highlight the development and advancement of trans-cyclooctene.
• To showcase its utility in bioorthogonal labeling reactions with s-tetrazines.
• To describe computational and synthetic advances enabling new applications.

Main Methods:

• Utilizing trans-cyclooctene for reactions with s-tetrazines.
• Leveraging advances in computational chemistry for reaction optimization.
• Employing synthetic chemistry for molecule development.

Main Results:

• Trans-cyclooctene exhibits the fastest reactivity among strained alkenes for tetrazine ligation.
• Achieves high reaction rates (k2 > 10^6 M^-1 s^-1) at low concentrations.
• Enables successful applications in chemical biology and nuclear medicine.

Conclusions:

• Trans-cyclooctene is a superior tool for bioorthogonal labeling due to its exceptional reactivity.
• Computational and synthetic advancements have expanded its utility.
• This molecule holds significant promise for future biological and medical imaging applications.