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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry

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Published on: August 19, 2012

Bioorthogonal 4H-pyrazole "click" reagents.

Nile S Abularrage¹, Brian J Levandowski¹, JoLynn B Giancola¹

¹Department of Chemistry, Massachusetts institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. rtraines@mit.edu.

Chemical Communications (Cambridge, England)

|March 29, 2023

Summary

New 4-oxo-4H-pyrazoles show enhanced stability and rapid reactivity for bioorthogonal chemistry. These compounds are promising click reagents, offering improved biological stability over fluorinated analogs.

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Area of Science:

Organic Chemistry
Chemical Biology
Medicinal Chemistry

Background:

4H-Pyrazoles are increasingly utilized as click reagents in chemical synthesis.
Fluorination of 4H-pyrazoles enhances their Diels-Alder reactivity but reduces stability in physiological conditions.
There is a need for stable 4H-pyrazoles suitable for bioorthogonal chemistry.

Purpose of the Study:

To investigate the Diels-Alder reactivity and biological stability of 4-oxo-substituted 4H-pyrazoles.
To identify novel, stable 4H-pyrazoles for bioorthogonal applications.

Main Methods:

Synthesis and characterization of three 4-oxo-substituted 4H-pyrazoles.
Evaluation of Diels-Alder reactions with endo-bicyclo[6.1.0]non-4-yne (BCN).
Assessment of biological stability against common nucleophiles.

Main Results:

4-oxo-4H-pyrazoles exhibit rapid Diels-Alder reactions with BCN.
These compounds demonstrate significantly improved stability in biological conditions compared to fluorinated pyrazoles.
The optimal 4-oxo-4H-pyrazole's reactivity is attributed to antiaromaticity, predistortion, and spirocyclization.

Conclusions:

4-oxo-4H-pyrazoles represent a promising class of bioorthogonal reagents.
Their combination of reactivity and stability makes them suitable for in vivo applications.
These findings expand the toolkit for click chemistry in biological systems.