BDP FL-PEG5-azide

BDP FL-PEG5-azide is a polyethylene glycol (PEG)-based linker engineered for PROTAC assembly, providing a flexible spacer that can improve productive ternary complex formation between a target-binding ligand and an E3 ligase recruiter. Its azide handle enables reliable bioorthogonal conjugation strategies commonly used in targeted protein degradation workflows. The following sections describe the molecule’s structure-related features and practical reactivity considerations for constructing PROTACs in a research setting.

Structure: The linker comprises a PEG chain featuring ether linkages that impart conformational flexibility and hydrophilicity, coupled to a terminal azide functional group. This combination supports solubility and spacer behavior, while the azide provides a chemically distinct reaction site for downstream conjugation.

Reactivity: The terminal azide is well suited for azide-based click conjugation, particularly strain-promoted azide–alkyne cycloaddition or copper-catalyzed azide–alkyne cycloaddition, depending on the partner functionality. Typical PROTAC synthesis uses inert atmosphere when required, polar aprotic solvents for solubility, and controlled temperatures to preserve sensitive ligands. Reaction proceeds via cycloaddition to form a stable triazole linkage under standard click-chemistry principles.