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t-Boc-Aminooxy-PEG4-acid contains a Boc-protected aminooxy group and a terminal carboxylic acid. The terminal carboxylic acid (CO2H) is reactive with primary amine groups in the presence of EDC, to form a amide bond. The hydrophilic PEG spacer increases solubility in aqueous media. The Boc-protected amine can be deprotected under mild acidic conditions.

Boc-aminoxy-PEG4-acid is a PEG-based PROTAC linker that can be used in the synthesis of PROTACs[1].

PEGs

[1] An S, et al. Small-molecule PROTACs: An emerging and promising approach for the development of targeted therapy drugs. EBioMedicine. 2018 Oct;36:553-562 DOI:10.1016/j.ebiom.2018.09.005