2-(2-(6-chlorohexyloxy)ethoxy)ethanamine

2-(2-(6-chlorohexyloxy)ethoxy)ethanamine, provides a flexible, ether-rich tether terminating in a primary amine, enabling robust conjugation to ligands used for targeted protein degradation. Its design supports efficient spatial presentation and chemical handle installation for assembling heterobifunctional degraders. The following sections describe the linker’s structure and practical reactivity considerations for PROTAC construction.

Structure: The linker contains an aliphatic primary amine and multiple ether linkages that confer conformational flexibility and favorable solvation behavior. A terminal chloroalkyl segment introduces a reactive functional motif, while the overall structure is predominantly composed of carbon–carbon and carbon–oxygen bonds, typical of linkers used in degraders.

Reactivity: The primary amine enables standard amide or urea formation with activated carboxylic acids or isocyanate/activated derivatives under base-mediated coupling conditions. The chloroalkyl functionality can participate in nucleophilic substitution reactions with appropriate nucleophiles to extend or diversify the linker architecture. Common approaches use polar aprotic solvents and mild bases, with reaction monitoring by chromatographic methods to ensure selective coupling and minimize side reactions.