DBCO-PEG4-alcohol

DBCO-PEG4-alcohol, integrates a DBCO (dibenzocyclooctyne) functional group with a PEG-based spacer terminated by an alcohol. Its design supports efficient bioorthogonal conjugation and flexible tethering, which can improve productive ternary complex formation in targeted protein degradation workflows. The detailed Structure and Reactivity parameters are provided below to guide researchers in experimental PROTAC assembly and subsequent conjugation steps.

Structure: DBCO-PEG4-alcohol contains a cyclooctyne core characteristic of strained-alkyne reactivity, connected through an ether-rich PEG chain to a terminal hydroxyl group. The molecule features an aromatic DBCO scaffold, multiple ether linkages, and a primary alcohol, yielding polarity, conformational flexibility, and enhanced solubility relative to purely hydrophobic linkers.

Reactivity: The DBCO moiety undergoes strain-promoted azide–alkyne cycloaddition (SPAAC) with azide-bearing partners under copper-free conditions, typically in polar, biocompatible solvents at mild temperatures to preserve sensitive functional groups. The PEG spacer and terminal alcohol enable further functionalization via standard alcohol chemistry (for example, derivatization to activate for coupling), while the SPAAC step proceeds through a cycloaddition mechanism without requiring catalysts.