Hydroxy-PEG11-Boc

Hydroxy-PEG11-Boc is a polyethylene glycol (PEG)-based linker designed for assembling PROTACs and other targeted protein degradation constructs. Its PEG segment provides conformational flexibility and improved solubility, while the Boc-protected functionality enables controlled downstream coupling to ligands under standard synthetic workflows. The hydroxyl handle supports reliable functionalization strategies, and the resulting linker architecture is well suited for tuning spatial separation between binding elements. Detailed structural and reactivity considerations are provided below.

Structure: The linker comprises a PEG chain terminated with a hydroxyl group and bearing a Boc-protected functional site. It contains repeating ether linkages typical of PEG, providing a flexible, hydrophilic scaffold. The Boc group is a carbamate protecting group that can be removed under acidic conditions, enabling chemoselective activation.

Reactivity: Boc functionality is commonly deprotected using mild acid conditions to reveal the corresponding amine or reactive carbamate-derived intermediate, which can then be used for PROTAC assembly. The hydroxyl terminus can be converted to activated derivatives (for example, via standard leaving-group formation) for nucleophilic substitution or coupling to electrophilic partners. Solvent systems and catalysts are selected to preserve PEG integrity and avoid side reactions during linker-ligand conjugation.