Bis-methacrylate-PEG5

Bis-methacrylate-PEG5 is a bifunctional polyethylene glycol methacrylate linker designed for modular PROTAC assembly, enabling efficient conjugation between ligand-bearing fragments through polymerizable handles. Its PEG-based scaffold provides conformational flexibility and improved solubility, which can help maintain productive ternary complex formation. The two methacrylate termini support controlled crosslinking or coupling strategies commonly used to build PROTAC architectures; the detailed structural and reactivity considerations are provided below.

Structure: This linker contains a PEG chain terminated by two methacrylate groups, providing ether-rich flexibility and two vinyl ester functionalities. The structure features ester linkages, ether oxygen atoms, and carbon–carbon double bonds suitable for radical or Michael-type transformations, yielding a hydrophilic, PROTAC-compatible scaffold.

Reactivity: Methacrylate termini are typically engaged under radical-mediated conditions for addition or polymerization-based coupling, often using appropriate initiators and inert atmosphere to minimize side reactions. Solvent choice commonly favors compatibility with both ligands and the PEG linker, such as polar aprotic media. For PROTAC construction, the linker can be incorporated via functional-group pairing with complementary nucleophiles or via controlled step-growth strategies that preserve linker integrity and spacing.