Benzyl-PEG7-Ms

Benzyl-PEG7-Ms is a polyethylene glycol (PEG) based linker bearing a benzyl group and a mesylate (Ms) leaving group, designed for efficient conjugation in PROTAC assembly. Its PEG segment provides conformational flexibility and improved solubility, while the mesylate enables reliable formation of covalent linkages to appropriate nucleophiles. This product is particularly useful for constructing targeted protein degraders by enabling modular attachment of ligands under mild, controlled conditions; detailed structural and reactivity considerations are provided below.

Structure: The linker comprises a benzyl substituent connected to a PEG chain terminating in a mesylate ester. It contains ether linkages characteristic of PEG, an aromatic benzyl ring, and a sulfonate ester functionality. These features confer flexibility, polarity, and compatibility with common organic synthesis workflows.

Reactivity: The mesylate group is well-suited for nucleophilic substitution, enabling attachment of PROTAC warheads or ligand handles bearing suitable nucleophiles such as amines or thiols. Typical approaches rely on mild base-mediated conditions to promote displacement of the mesylate, often using polar aprotic solvents and controlled temperature to limit side reactions. No special catalysts are generally required beyond standard inorganic bases used in substitution chemistry.