Azido-PEG4-Amido-tri-(t-butoxycarbonylethoxymethyl)-methane | CAS 1421933-29-0

Azido-PEG4-Amido-tri-(t-butoxycarbonylethoxymethyl)-methane is a PEGylated, azide-functionalized tri-substituted building block designed for copper-catalyzed azide–alkyne cycloaddition (CuAAC) click chemistry. The reagent couples a flexible PEG4 spacer and an amide linkage to a tri-functional core bearing masked reactive handles, which is advantageous for constructing multivalent conjugates with improved solubility and controlled architecture. Its azide functionality makes it a common choice for labeling, surface functionalization, and modular assembly of probes, biomaterials, and imaging reagents where multivalency and aqueous compatibility are important.

1. Multivalent Probe Labeling

Azido-PEG4-Amido-tri-(t-butoxycarbonylethoxymethyl)-methane is widely used to introduce azide groups into labeling workflows that benefit from multivalency, such as building higher-avidity molecular probes for fluorescence and affinity-based detection platforms. Researchers often pair this reagent with alkyne-bearing dyes, affinity tags, or reporter scaffolds to generate conjugates with enhanced presentation of reactive moieties along a PEG4 spacer. The tri-functional architecture supports the preparation of probe sets with consistent stoichiometry and improved water compatibility compared with non-PEGylated azide reagents, which can be especially useful when downstream conjugation is performed in buffered, aqueous conditions.

2. Bioconjugation for Biomolecular Tools

Azido-PEG4-Amido-tri-(t-butoxycarbonylethoxymethyl)-methane serves as a versatile azide handle for bioconjugation strategies that require modular attachment to biomolecules and biomolecular mimics. In chemical biology and molecular imaging research, it is frequently incorporated as a click-ready linker to assemble labeled peptides, protein conjugates, nucleic-acid-associated constructs, and other research tools that are subsequently decorated with alkyne-functional reporters. The PEG4 spacer and amide connectivity help maintain conjugate solubility and reduce nonspecific aggregation during conjugation and handling, supporting reproducible preparation of click-assembled reagents used in assay development and mechanistic studies.

3. Surface and Hydrogel Functionalization

Azido-PEG4-Amido-tri-(t-butoxycarbonylethoxymethyl)-methane is applicable to materials chemistry workflows that require robust, click-compatible surface or scaffold functionalization. Materials scientists use the azide functionality to tether alkyne-bearing polymers, crosslinkers, or imaging ligands onto surfaces and within hydrogel networks, enabling spatially defined modification and modular post-functionalization. The PEG4 segment can improve dispersion and interaction with aqueous media, while the tri-substituted core supports denser functional coverage when multivalent presentation is desired. Such approaches are commonly used to generate tunable material interfaces for studying binding, transport, and labeling behavior in complex environments.

4. Molecular Imaging Conjugates

Azido-PEG4-Amido-tri-(t-butoxycarbonylethoxymethyl)-methane is used in the construction of imaging and visualization conjugates where azide–alkyne click assembly provides a reliable route to attach alkyne-functional reporters to a defined scaffold. Molecular imaging teams often rely on this reagent to introduce a PEGylated, multivalent azide platform that can be coupled to fluorophores, luminescent tags, or other imaging moieties bearing terminal alkynes. The resulting conjugates are designed to maintain favorable solubility and reduced aggregation tendencies during probe preparation and handling, supporting consistent labeling chemistry across different reporter formats and experimental setups.