1,1,1-Trifluoroethyl-PEG4-azide

1,1,1-Trifluoroethyl-PEG4-azide, is designed to enable efficient modular assembly of targeted protein degraders through azide-based conjugation. Its PEG-based spacer provides conformational flexibility and improved linker solubility, while the trifluoroethyl group can influence local polarity and stability of the resulting conjugates. The azide functionality supports widely used bioorthogonal coupling strategies, facilitating the preparation of PROTACs with controlled attachment points.

Structure: The molecule contains an azide functional group attached to a polyethylene glycol spacer, incorporating ether linkages that confer flexibility and hydrophilicity. A trifluoroethyl substituent introduces electron-withdrawing fluorine atoms, affecting polarity and intermolecular interactions. Overall, it is an organic linker suitable for click-type conjugation chemistry.

Reactivity: The azide group is compatible with copper-catalyzed azide–alkyne cycloaddition, enabling formation of stable triazole linkages to alkyne-bearing ligands under standard click conditions. Alternatively, strain-promoted azide–alkyne cycloaddition can be used when copper-free coupling is preferred. Typical setups employ polar organic solvents or solvent mixtures compatible with PROTAC synthesis, with reaction progress monitored by chromatographic methods and purified by standard preparative techniques.