DSPE-PEG46-N3

This DSPE-PEG46-N3 linker is a PEGylated phospholipid bearing an azide handle, designed to support modular assembly of PROTAC and related targeted degradation constructs. Its amphiphilic DSPE anchor can improve compatibility with lipid-containing environments, while the PEG spacer provides conformational flexibility that can aid productive ternary complex formation. The azide functionality enables bioorthogonal conjugation strategies, and the sections below describe its structure and practical reactivity for PROTAC synthesis.

Structure: The molecule combines a phospholipid (DSPE) hydrophobic domain with a poly(ethylene glycol) chain terminated by an azide group. It contains ether linkages within the PEG segment and stable C–N and C–O bonds, with an azide suitable for click-type coupling. The overall architecture is amphiphilic and water-dispersible.

Reactivity: The terminal azide enables azide–alkyne cycloaddition for conjugation to alkyne-bearing partners under copper-free or copper-catalyzed conditions, depending on substrate sensitivity. In typical PROTAC linker assembly workflows, the azide reacts with complementary alkynes via a Huisgen cycloaddition mechanism to form a stable triazole linkage. Reaction compatibility is commonly optimized using polar solvents and controlled temperatures, and catalyst choice is selected to preserve labile functional groups on warheads and ligands.