mPEG16-alcohol

mPEG16-alcohol is a polyethylene glycol–based linker building block designed for constructing PROTAC conjugates and related targeted degradation platforms where controlled hydrophilicity and flexible spacer behavior are beneficial. Its ether-rich backbone can improve solubility and reduce nonspecific interactions, supporting efficient bioconjugation workflows. In PROTAC technology, such linkers are commonly used to tune linker length, conformational freedom, and overall physicochemical properties; detailed structural and reactivity guidance is provided below.

Structure: mPEG16-alcohol consists of a methoxy-terminated poly(ethylene glycol) chain bearing a terminal hydroxyl group. The structure is dominated by ether linkages along the polymer backbone, with a flexible, solvated chain conformation that promotes hydrophilicity and hydrogen-bonding at the alcohol terminus.

Reactivity: The terminal alcohol enables standard PROTAC linker functionalization via activation to form leaving groups or conversion to coupling-ready derivatives. Typical approaches include esterification or ether formation with activated carboxylic acids, or transformation to activated carbonate/halide intermediates under base-mediated conditions. Solvent systems such as polar aprotic media are commonly used, with mild catalysts where appropriate, to preserve sensitive warheads and maintain compatibility with subsequent conjugation steps.