Bromo-PEG6-alcohol

Bromo-PEG6-alcohol is a PEG-based, bromo-functional linker designed for assembling PROTACs through reliable carbon–heteroatom coupling handles. Its flexible poly(ethylene glycol) segment supports favorable linker solvation and conformational adaptability, which can improve effective positioning of the target-binding and E3-recruiting ligands. The bromide functionality enables straightforward derivatization strategies commonly used in targeted protein degradation workflows. Detailed structural and reactivity considerations are provided below.

Structure: The linker comprises a poly(ethylene glycol) chain terminated with a primary alcohol and a bromo substituent, providing an ether-rich, flexible scaffold. It contains C–O ether bonds along the PEG backbone, a terminal C–O bond at the alcohol, and a carbon–bromine bond that serves as a synthetic handle. Overall, it is polar and hydrophilic.

Reactivity: The bromo group is suitable for nucleophilic substitution or related cross-coupling-compatible transformations, enabling attachment of PROTAC warheads or ligand fragments under standard organic synthesis conditions. Derivatization typically proceeds via halide activation followed by nucleophile addition, with base-mediated formation of the nucleophile from alcohol or amine partners where appropriate. Solvents such as polar aprotic media are commonly used, and catalysts may be selected based on the intended coupling mode.