3-Azido-7-hydroxy-2H-1-benzopyran-2-one | CAS 817638-68-9

3-Azido-7-hydroxy-2H-1-benzopyran-2-one is an azide-functional coumarin scaffold that combines a phenolic hydroxyl with a photoactive benzopyranone chromophore, enabling fluorescence labeling workflows alongside click-compatible conjugation. In practice, researchers use this reagent to build fluorescent conjugates and staining reagents where post-labeling attachment via azide chemistry is required, including probe construction for microscopy and fluorescence-based assays. The coumarin core supports UV/blue-excitation fluorescence readouts commonly leveraged in molecular imaging and analytical biology.

1. Fluorescent Bioconjugation

3-Azido-7-hydroxy-2H-1-benzopyran-2-one is used as a fluorescent handle for bioconjugation reagent development, allowing fluorescent tagging of proteins, peptides, and other biomolecules through downstream azide-based coupling strategies. Researchers incorporate the coumarin-azide into labeling workflows for constructing imaging reagents and quantitative fluorescence standards, where the benzopyranone fluorophore provides direct optical readout after conjugate assembly. This approach is particularly relevant when the fluorescent moiety must be installed as a modular component and then attached to a targeting or functional biomolecule in a controlled manner.

2. Fluorescence Microscopy Labeling

3-Azido-7-hydroxy-2H-1-benzopyran-2-one supports fluorescence microscopy workflows by serving as a coumarin-based labeling component in conjugates used for cellular and biomolecular imaging. Laboratories often employ coumarin fluorescence for multicolor imaging panels where coumarin emission can be distinguished from other common fluorophores, and the azide functionality enables flexible attachment to targeting ligands or biomaterial surfaces used in imaging experiments. The phenolic hydroxyl further helps maintain the dye's utility as a fluorescent reporter within conjugate formats designed for microscopy studies.

3. Polymer And Surface Functionalization

3-Azido-7-hydroxy-2H-1-benzopyran-2-one is frequently incorporated into polymer and biomaterials functionalization strategies to create fluorescently traceable materials and surface coatings. Materials scientists use the azide-bearing coumarin scaffold to prepare fluorescent surface-modified substrates where subsequent coupling to amine- or alkyne-reactive partners can be performed as part of a stepwise materials engineering workflow. This enables construction of fluorescence-traceable hydrogels, coatings, and engineered interfaces used in materials research, assay development, and imaging-based characterization of biomaterial systems.