[10-(Diethoxy-phosphoryl)-decyl]-phosphonic acid

[10-(Diethoxy-phosphoryl)-decyl]-phosphonic acid, provides a chemically versatile phosphonate handle for assembling degraders that connect ligands through robust, polar linkages. Its phosphoryl and phosphonic acid functionality supports strong hydrogen-bonding and favorable solubility behavior in common organic/aqueous mixtures, which can help maintain productive ternary-complex formation.

Structure: The linker contains a decyl alkyl spacer terminating in a phosphonic acid group and a diethoxy-phosphoryl substituent. It features P–O and P–C connectivity, with multiple oxygen atoms enabling strong hydrogen bonding. The presence of both phosphoryl and phosphonic acid motifs provides high polarity and acid-base responsiveness.

Reactivity: For PROTAC construction, the phosphonic acid functionality can be used for coupling strategies that form stable phosphate/phosphonate linkages, typically under dehydrating or activating conditions compatible with amide or ester-forming chemistries. Diethoxy-phosphoryl groups can undergo alcoholysis or hydrolysis to generate reactive phosphate intermediates, enabling stepwise conjugation. Suitable conditions often involve controlled pH, inert atmosphere when needed, and solvents such as alcohols, polar aprotic media, or buffered aqueous-organic mixtures, with standard coupling reagents and base catalysts selected to preserve sensitive ligand stereochemistry.