t-Boc-N-amido-PEG7-azide

t-Boc-N-amido-PEG7-azide is a polyethylene glycol (PEG)-based linker bearing an azide handle and a protected amide functionality, designed to facilitate modular assembly of PROTACs. Its flexible PEG chain can improve solubility and conformational adaptability between the target-binding ligand and the E3 ligase-recruiting moiety. The azide group enables reliable chemoselective conjugation strategies commonly used in targeted protein degradation workflows. The

Structure: The molecule contains a PEG oligomer backbone with an azide substituent and a Boc-protected amide, providing a flexible, hydrophilic linker domain. It features carbamate and amide linkages, along with ether linkages typical of PEG, which together support stable, non-volatile handling and controlled functional-group exposure.

Reactivity: The azide enables copper(I)-catalyzed azide–alkyne cycloaddition or related azide-compatible coupling routes to install the linker between PROTAC fragments under mild conditions. The Boc group can be removed using standard acidolysis to reveal the amide for subsequent coupling chemistries, such as amide bond formation. Solvent systems that maintain PEG solubility and preserve azide integrity are typically selected, with catalysts and bases chosen to minimize side reactions.