Azide-PEG7-Tos

This Azide-PEG7-Tos linker is designed for modular PROTAC assembly, providing a polyethylene glycol spacer that improves solubility and spatial presentation between targeting ligands. The azide handle enables efficient, bioorthogonal conjugation strategies, while the tosylate functionality supports controlled nucleophilic substitution. Together, these features facilitate reliable construction of targeted protein degraders, with detailed structural and synthetic considerations provided below.

Structure: The molecule combines a PEG-based flexible linker with an azide functional group and a tosylate leaving group. It contains ether linkages within the PEG chain, aromatic sulfonate-derived connectivity, and an azide moiety suitable for click-type chemistry. Overall, it is typically polar and conformationally adaptable.

Reactivity: The azide group is commonly used in copper-catalyzed azide–alkyne cycloaddition or related azide conjugation workflows, enabling attachment to complementary alkyne-bearing partners. The tosylate group is suited to nucleophilic substitution with amines or other nucleophiles under standard organic synthesis conditions. Solvent choice and base selection are typically guided by nucleophile strength and stability of the PEG–azide motif.