(3-[2-Aminoethyl)dithio]propionic acid HCl

This PROTAC linker, (3-[2-Aminoethyl)dithio]propionic acid HCl, is designed to provide a reactive dithio-linked handle and a protonated amino functionality for assembling bifunctional degraders. Its key features support modular conjugation to ligands under standard organic synthesis conditions, enabling efficient preparation of targeted protein degradation constructs. The detailed structural and reactivity considerations for experimental workflows are provided below.

Structure: The linker contains a dithioether motif embedded in a propionic acid framework and a terminal aminoethyl segment. It is present as a hydrochloride salt, increasing ionic character and facilitating handling. Key functional groups include a carboxylic acid, a primary amine, and sulfur-containing linkages capable of forming thioether linkages during conjugation.

Reactivity: Suitable PROTAC assembly typically relies on carboxyl- or amine-directed coupling strategies, such as activating the carboxylic acid for amide formation or coupling the amine to electrophilic partners. Reactions are commonly conducted under inert or controlled atmospheres where sulfur-containing groups are protected from oxidation. Base-assisted conditions in compatible organic solvents are often used to promote nucleophilic substitution or acyl transfer, with coupling reagents selected to minimize side reactions.