Azido-PEG4-oxazolidin-2-one | CAS 1919045-03-6

Azido-PEG4-oxazolidin-2-one is a PEGylated azide-bearing click chemistry reagent that combines an azide handle for bioorthogonal conjugation with an oxazolidin-2-one motif commonly used as a versatile electrophilic/functional group in chemical biology workflows. Its polyethylene glycol linker improves aqueous compatibility and reduces nonspecific interactions, making it well suited for labeling, surface functionalization, and reagent incorporation into larger molecular constructs. The presence of the azide enables downstream strain-promoted or catalyst-free click strategies for attaching the oxazolidin-2-one functionality to biomolecules, polymers, and imaging or diagnostic scaffolds.

1. Biomolecule Labeling

Azido-PEG4-oxazolidin-2-one is frequently used in bioconjugation workflows where researchers need to introduce a PEG-spaced azide handle into proteins, peptides, or nucleic-acid-associated constructs prior to click-based assembly of multifunctional probes. The reagent’s PEG4 spacing supports efficient conjugation and helps maintain solubility during buffer-exchange and purification steps typical of labeling pipelines. In practice, it is incorporated as a modular building block to generate intermediate conjugates that can be further functionalized with complementary click partners, enabling the construction of affinity reagents, binding probes, and multi-component chemical tools for mechanistic studies and assay development.

2. Surface And Material Functionalization

Azido-PEG4-oxazolidin-2-one is well aligned with materials chemistry use cases where azide-bearing linkers are required to create clickable surfaces for subsequent grafting or patterning. Researchers apply this reagent to functionalize polymer films, hydrogel networks, and biomaterial surfaces with PEG-mediated spacing that can improve accessibility of reactive sites and reduce steric hindrance for downstream conjugation. After immobilization or incorporation, the azide enables modular attachment of fluorescent tags, affinity ligands, or other functional moieties through click coupling, supporting the development of customizable platforms for biosensing, surface-based assays, and research-grade materials.

3. Molecular Imaging Probes

Azido-PEG4-oxazolidin-2-one is used as a chemical handle in the preparation of imaging and detection reagents that require controlled attachment of functional groups to targeting scaffolds or reporter constructs. The PEG4 linker helps maintain dispersion and reduces aggregation tendencies when probes are assembled in aqueous systems, which is particularly valuable during probe formulation and characterization. By leveraging the azide for click-compatible assembly, teams can generate probe intermediates that carry the oxazolidin-2-one functionality while enabling rapid conjugation to imaging reporters or signal-generating components, supporting iterative design of molecular imaging tools.

4. Diagnostic Reagent Development

Azido-PEG4-oxazolidin-2-one supports diagnostic-reagent workflows that rely on modular conjugation strategies to build assay-ready reagents with defined chemical composition and spacing. In many development settings, the reagent is used to introduce an azide-bearing PEG linker into antibody fragments, affinity binders, or assay components, allowing subsequent click-based installation of detection reporters or capture elements. The oxazolidin-2-one motif provides an additional functional handle for constructing multi-functional assay formats, while the PEG4 spacer promotes consistent behavior in buffered assay conditions and helps preserve accessibility of labeled groups for downstream assay assembly and reagent screening.