m-PEG20-alcohol

m-PEG20-alcohol is a polyethylene glycol-based linker alcohol designed to support the modular synthesis of PROTACs by providing a flexible, hydrophilic spacer between binding elements. Its ether-rich PEG backbone can enhance solubility and reduce nonspecific interactions, while the terminal alcohol enables straightforward functionalization for conjugation strategies. The subsequent points describe its structural features and practical considerations for assembling PROTAC constructs using this linker.

Structure: The linker comprises a repeating PEG ether chain terminated by a primary alcohol. Its polyether backbone contains multiple ether oxygen atoms, enabling strong hydrogen-bonding interactions and high conformational flexibility. The molecule is generally characterized by hydrophilicity and ether-dominated polarity, supporting improved aqueous compatibility.

Reactivity: As a terminal alcohol, it is suitable for conversion into activated derivatives (for example, ester or carbonate intermediates) that can be coupled to complementary PROTAC fragments bearing nucleophiles such as amines or carboxylates. Typical transformations rely on standard alcohol activation chemistries using coupling reagents under mild, anhydrous conditions with inert atmosphere when required. Solvent choice often favors polar aprotic media to maintain solubility and reaction efficiency.