Pyrene-PEG5-propargyl

Pyrene-PEG5-propargyl is a bifunctional PROTAC linker designed to couple a hydrophobic pyrene tag with a flexible polyethylene glycol spacer terminating in a propargyl (alkyne) handle. This combination supports robust conjugation chemistry and favorable linker solubility while enabling modular assembly of targeted protein degraders. The following points describe the structure and reactivity features in detail for research use.

Structure: The linker contains a pyrene aromatic moiety connected through a polyethylene glycol chain to a terminal propargyl group. It features an ether-rich PEG segment providing flexibility, and a carbon–carbon triple bond at the propargyl terminus suitable for click-type coupling. Overall, it is expected to be amphiphilic and solution-compatible.

Reactivity: The terminal alkyne enables copper-catalyzed azide–alkyne cycloaddition (CuAAC) with azide-functional partners under standard click conditions, typically using a copper catalyst system and an appropriate solvent such as aqueous/organic mixtures. Alternatively, strain-promoted azide–alkyne cycloaddition can be used with cyclooctyne/related azides without copper. Mechanistically, the reaction proceeds via formation of a triazole linkage, facilitating efficient PROTAC conjugation.