Synthesis of Tetra(2-hydroxyethoxy)-Substituted Dibenzocyclooctyne Derivatives as Novel, Highly Hydrophilic Tool Compounds for Strain-Promoted Alkyne-Azide Cycloaddition Applications

Abstract

The synthesis of a novel, hydrophilic dibenzocyclooctyne derivative for strain-promoted alkyne-azide cycloaddition (SPAAC) is described. Starting from 2-(3,4-dimethoxyphenyl)acetaldehyde, the corresponding activated carbonate of 2,3,8,9-tetrakis(2-hydroxyethoxy)-5,6-dihydro-11,12-didehydrodibenzo[a,e][8]annulene, termed THE-DIBO, was prepared in seven steps and 24% overall yield. A water-soluble THE-DIBO analogue showed a k₂ value of (21.9 ± 0.2) × 10^–2 M^–1 s^–1 for SPAAC with 2-azidoethanol in water. The high hydrophilicity and steric bulk of THE-DIBO derivatives should to suppress nonspecific thiol-yne addition of proteins to strained alkynes observed for SPAAC labeling in complex proteomes.

Key words

alkynes - azides - conjugation - proteins - SPAAC - click chemistry - thiol-yne addition - bioorthogonal chemistry

• References

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