Boc-Aminooxy-PEG2-C2-amine

Boc-Aminooxy-PEG2-C2-amine is a PEG-based bifunctional linker designed for assembling PROTACs and related targeted protein degradation constructs. Its aminooxy functionality supports chemoselective oxime formation, while the protected amine enables controlled coupling to targeting ligands. The flexible polyethylene glycol segment can improve solubility and conformational adaptability, helping maintain productive ternary-complex formation.

Structure: The molecule contains a Boc-protected primary amine and an aminooxy group, connected through a short polyethylene glycol segment and a two-carbon spacer. It features ether linkages typical of PEG, an aminooxy functionality suited for condensation chemistry, and carbamate protection that modulates nucleophilicity.

Reactivity: PROTAC assembly commonly uses the aminooxy group to form oxime or related oxime-linked linkages under mildly acidic, aqueous or mixed-solvent conditions, typically by condensation with aldehyde-bearing partners. The Boc-protected amine is generally activated after deprotection using standard acid-labile conditions, then used for amide or urea bond formation via coupling reagents. Solvent systems are often chosen to balance PEG solubility and reaction kinetics.