Benzyl-PEG7-azide

Benzyl-PEG7-azide is a PEG-based azide linker designed for modular PROTAC synthesis, enabling efficient conjugation of ligands through azide-compatible chemistries. Its flexible poly(ethylene glycol) scaffold supports favorable linker solvation and conformational freedom, which can help tune ternary complex formation and targeted protein degradation performance. The benzyl capping group provides a defined attachment handle, while the azide functionality enables reliable coupling strategies.

Structure: The molecule contains a benzyl-terminated PEG chain bearing a terminal azide group. It features ether linkages characteristic of PEG, flexible C–O and C–C connectivity, and a covalently bound azide suitable for click-type transformations. The resulting amphiphilic character supports aqueous solubility and reduced nonspecific hydrophobic interactions.

Reactivity: The azide group is well suited for copper-catalyzed azide–alkyne cycloaddition and related azide coupling approaches used in PROTAC assembly. Typical conditions employ a compatible alkyne partner, a copper catalyst system, and an inert or controlled atmosphere to minimize side reactions; aqueous/organic mixed solvents are commonly used for solubility. Reaction progress is governed by catalyst activation and alkyne accessibility, with purification by standard chromatography or precipitation methods.