THP-PEG4-t-butyl acetate is a polyethylene glycol (PEG) derivative featuring a tetrahydrofuran ether (THP) protecting group and a t-butyl ester. The structure comprises a THP cyclic ether moiety, a PEG4 chain segment, and an end-terminal t-butyl ester group, combining the properties of lipophilic protecting groups and hydrophilic PEG chains.
**Production Process**: This compound is synthesized using 2-bromoacetic acid t-butyl ester and tetraethylene glycol diol as starting materials. In dimethyl sulfoxide (DMSO) solvent, a nucleophilic substitution reaction is catalyzed by sodium hydride (NaH). By controlling the reaction temperature (from 0°C to room temperature) and reaction time (23 hours), followed by ether extraction and silica gel column purification, high-purity product is obtained with a yield of up to 72.7%.
**Application Scenarios**: As a key linker in PROTAC technology, its THP group protects hydroxyl groups from side reactions, while the t-butyl ester group can be removed under acidic conditions to release active molecules. The PEG segment enhances molecular water solubility and reduces immunogenicity. This compound is widely used in the development of targeted protein degraders, peptide modification, and drug delivery systems (e.g., surface modification of solid lipid nanoparticles), significantly improving drug stability and targeting efficiency.