di-(N-Succinimidyl) adipate

This di-N-hydroxysuccinimide adipate linker is designed for robust, amide-bond formation in PROTAC assembly workflows. Its bifunctional NHS ester architecture enables efficient conjugation to primary amines on ligands, facilitating the construction of targeted protein degradation systems with controlled linker length and reactive-group density. The molecule’s high reactivity toward nucleophiles and its well-established NHS-ester chemistry make it a practical choice for researchers seeking reliable coupling steps; detailed structural and reactivity considerations follow below.

Structure: The linker contains an adipate core bearing two N-hydroxysuccinimide ester termini connected through an aliphatic diester framework. It features activated carboxylate groups that undergo nucleophilic acyl substitution, producing stable amide bonds. The presence of succinimide leaving groups supports efficient coupling under mild conditions.

Reactivity: Suitable reactions involve nucleophilic primary amines reacting with NHS ester groups via acyl substitution, typically followed by base-mediated capture of the leaving group. Common conditions use aqueous or mixed aqueous organic solvents with buffering near neutral pH to preserve amine nucleophilicity while minimizing hydrolysis. No special catalysts are required; coupling is driven by the intrinsic electrophilicity of NHS esters. Protecting groups and stoichiometry control help limit crosslinking during PROTAC synthesis.