mPEG7-aldehyde

mPEG7-aldehyde is an mPEG-based aldehyde linker designed to enable efficient conjugation of PROTAC components through aldehyde-reactive chemistry. Its PEG architecture supports aqueous solubility and can help tune the physicochemical profile of assembled degraders, while the aldehyde handle enables formation of stable linkages with complementary nucleophiles used in targeted protein degradation workflows. The following sections describe the structure and the practical reactivity considerations in detail below.

Structure: The molecule comprises a methoxy-terminated poly(ethylene glycol) chain bearing a terminal aldehyde functional group. It contains an ether-rich PEG backbone and a carbonyl-containing aldehyde at the reactive terminus. The presence of polar oxygen atoms and the terminal carbonyl confer hydrophilicity and characteristic carbonyl reactivity.

Reactivity: The aldehyde group is suitable for nucleophilic addition and condensation reactions commonly used to connect PROTAC-building blocks, including formation of imines or related reversible adducts under controlled conditions. Reaction performance is typically optimized by selecting compatible nucleophiles, maintaining appropriate pH to balance aldehyde stability and nucleophile reactivity, and using aqueous or mixed solvent systems that preserve PEG solubility. Mild catalysts may be employed when consistent with the intended linkage chemistry.