Propargyl-PEG10-amine

Propargyl-PEG10-amine is a PEG-based bifunctional linker designed for modular PROTAC synthesis, enabling efficient conjugation between an E3 ligase ligand and a target-binding moiety. The propargyl handle supports reliable click-type coupling, while the terminal amine provides an orthogonal functional site for amide or urea formation. This combination improves synthetic flexibility and can help tune linker length, polarity, and conformational behavior in targeted protein degradation constructs.

Structure: The linker contains a polyethylene glycol chain terminated by a primary amine and a propargyl group, featuring ether linkages along the PEG backbone and a terminal alkyne suitable for bioorthogonal coupling. Its amphiphilic, flexible character supports solubility and reduced nonspecific interactions in conjugation workflows.

Reactivity: The terminal alkyne is commonly used in copper-catalyzed azide–alkyne cycloaddition to connect to azide-bearing PROTAC partners, typically using Cu(I) generated in situ with a suitable ligand and base, in polar solvents compatible with PEG. The primary amine enables formation of amide or related linkages via activated carboxylic acids or isocyanate/activated carbonate chemistry. Reaction conditions should preserve functional-group compatibility and minimize PEG degradation.