DBCO-NHCO-PEG4-NH-Boc | CAS 1255942-12-1

DBCO-NHCO-PEG4-NH-Boc is a difluorobenzocyclooctyne (DBCO) based click chemistry reagent designed for strain-promoted azide–alkyne cycloaddition (SPAAC) labeling under copper-free conditions. The structure integrates a DBCO cyclooctyne handle for rapid bioorthogonal coupling, a PEG4 spacer to improve solubility and reduce steric effects, and a Boc-protected amide functionality that can be leveraged for downstream conjugation workflows. This reagent is commonly used in chemical biology and biomaterials research to prepare azide-bearing targets for controlled attachment, surface functionalization, and probe assembly where minimal reaction perturbation is required.

1. Bioorthogonal Probe Conjugation

DBCO-NHCO-PEG4-NH-Boc is widely used to assemble azide-functional probes for fluorescence, affinity, and analytical readouts in chemical biology workflows. The PEG4 spacer supports efficient coupling to biomolecules and reduces nonspecific interactions during probe preparation, which is valuable when labeling proteins, peptides, or nucleic-acid constructs that are sensitive to harsh conditions. The DBCO handle enables copper-free SPAAC chemistry with azide-bearing partners, making it a practical choice for preparing imaging and detection reagents used in instrument-based assays and binding studies.

2. Surface and Material Functionalization

DBCO-NHCO-PEG4-NH-Boc supports the fabrication of functional surfaces and polymeric materials by coupling to azide-functionalized substrates such as modified hydrogels, coatings, and bead-based supports. The PEG4 segment helps maintain accessibility of the reactive handle and improves compatibility with aqueous processing steps commonly used in materials science and diagnostic reagent development. Researchers use this reagent to introduce well-defined linkers and spacing between the material and the attached azide-bearing component, enabling reproducible performance in downstream binding assays, capture platforms, and modular reagent architectures.

3. Linker-Enabled Biomolecule Labeling

DBCO-NHCO-PEG4-NH-Boc is used as a click-compatible linker reagent to install PEG-spaced attachment points on biomolecules that carry azide groups, including engineered protein constructs and labeled peptide scaffolds. The DBCO moiety provides a robust SPAAC coupling handle that is compatible with typical bioconjugation conditions, while the PEG4 spacer improves conjugate solubility and helps preserve biomolecular behavior during labeling and purification. The Boc-protected amide functionality is particularly useful for creating conjugates that can undergo further derivatization in later stages of a labeling pipeline, supporting modular build strategies for research-grade biomolecular reagents.

4. Diagnostic Reagent Platform Building

DBCO-NHCO-PEG4-NH-Boc is commonly incorporated into the build-out of diagnostic and analytical reagent platforms that rely on modular conjugation chemistry. By enabling copper-free coupling to azide-bearing components, it allows consistent assembly of multi-component reagent systems such as capture/detection conjugates, reagent linkers, and standardized labeling intermediates used in assay development. The PEG4 spacer contributes to controlled presentation of the attached moiety, which is advantageous when designing reagent formats that must remain stable and dispersible through preparation, storage, and assay workflow handling.