Azido-PEG6-Br

Azido-PEG6-Br is a bifunctional polyethylene glycol-based linker designed for modular PROTAC assembly, enabling efficient conjugation between a ligand bearing a bromide-reactive handle and an azide-bearing partner. Its PEG character supports favorable solubility and conformational flexibility, which can improve productive ternary complex formation in targeted protein degradation workflows. The points below describe the molecule’s structure and practical reactivity considerations for constructing PROTACs in a research setting.

Structure: Azido-PEG6-Br contains an azide functional group and a terminal bromide separated by a polyethylene glycol chain. The structure features ether linkages within the PEG backbone and carbon–nitrogen bonds in the azide, providing a flexible, polar, and chemically stable linker suitable for bioconjugation.

Reactivity: The azide group is commonly used in copper-catalyzed azide–alkyne cycloaddition or related click chemistries, while the bromide can serve as an electrophile for nucleophilic substitution with amines or other nucleophiles to form C–N or related linkages. Typical PROTAC linker coupling strategies employ inert or controlled atmospheres, appropriate polar solvents, and catalysts such as copper(I) for click reactions, with reaction conditions optimized to preserve sensitive ligands.