t-Boc-Aminoxy-PEG4-Tos

t-Boc-Aminooxy-PEG4-Tos is a bifunctional crosslinker reagent with a t-Boc-aminooxy group and a tosyl group. The tosyl group is a very good leaving group for nucleophilic substitution. The protected aminooxy can be deprotected under mild acidic conditions. PEG5 spacer increases solubility in aqueous media.

Boc-Aminooxy-PEG4-Tos 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