mPEG9-alcohol

mPEG9-alcohol is a polyethylene glycol (PEG)-based linker alcohol designed to support PROTAC synthesis by providing a hydrophilic, flexible spacer that can improve solubility and reduce nonspecific interactions. Its terminal hydroxyl functionality enables straightforward conjugation to electrophilic coupling partners used in targeted protein degradation workflows. The subsequent points describe its structural features and practical considerations for PROTAC assembly.

Structure: mPEG9-alcohol consists of an mPEG chain terminated by a primary alcohol, featuring repeating ether linkages that confer conformational flexibility. The molecule is characterized by ether and alcohol functional groups, with a largely nonionic, hydrophilic backbone that promotes water compatibility and stable handling under typical organic synthesis conditions.

Reactivity: The terminal alcohol enables coupling strategies commonly used in PROTAC linker construction, including formation of activated derivatives (for example, via esterification or carbonate/urethane-type intermediates) followed by nucleophilic substitution with amines or other nucleophiles on targeting ligands. Suitable conditions generally rely on standard anhydrous organic solvents, mild bases, and dehydrating/activating reagents consistent with ether-stable PEG chemistry. Reaction monitoring by chromatography or spectroscopic methods is recommended to ensure complete conversion and minimize PEG-related side reactions.