Amino-PEG8-alcohol

Amino-PEG8-alcohol is a versatile polyethylene glycol (PEG)-based linker building block designed for constructing PROTACs and related targeted protein degradation conjugates. Its ether-rich, flexible scaffold helps tune linker length, solubility, and presentation of functional groups for efficient ternary-complex formation. The terminal amino and alcohol functionalities enable straightforward, modular coupling to diverse ligands under standard bioconjugation conditions.

Structure: The linker comprises a PEG chain featuring repeating ether units that confer conformational flexibility and hydrophilicity. It terminates in a primary amine and a primary alcohol, offering complementary nucleophilic handles. The molecule contains C–O ether bonds and C–N/C–O functional linkages suitable for common derivatization chemistries.

Reactivity: The amino group readily participates in amide coupling, carbamate formation, or reductive amination depending on the electrophile used. The alcohol can be converted to activated esters or leaving-group derivatives for nucleophilic substitution. Typical PROTAC assembly strategies use mild bases and polar aprotic solvents, with coupling reagents such as carbodiimides for amide bond formation; reactions are generally performed under conditions that preserve ligand integrity and minimize side reactions from competing hydrolysis.