5-Azido-pentanoic acid

5-Azido-pentanoic acid is a five-carbon amino acid building block bearing a terminal azide functional group, enabling efficient chemoselective derivatization in chemical biology and materials workflows. Its azide handle is stable enough for routine handling yet reactive under established conjugation conditions, making the compound a practical precursor for installing amino acid-like fragments into larger structures. Researchers commonly use this scaffold to introduce azide functionality at defined positions for subsequent coupling, labeling, or surface immobilization.

1. Click Chemistry Labeling

5-Azido-pentanoic acid is widely used as an azide-bearing building block for copper-catalyzed azide-alkyne cycloaddition and related "click" workflows, where the terminal azide provides a clean, high-yield route to triazole-linked products. Chemical biology groups and polymer/materials researchers rely on this reagent to generate azide-to-alkyne conjugates with controlled linker length, supporting downstream attachment of probes, affinity tags, or imaging/functional motifs. The carboxylic acid functionality also supports straightforward incorporation into linker architectures used for labeling strategies and bioconjugation reagent design.

2. Bioconjugate Linker Synthesis

5-Azido-pentanoic acid serves as a practical intermediate for constructing azide-terminated linkers that can be incorporated into larger bioconjugates, including peptide-linked or polymer-linked systems. Bioconjugation and proteomics workflow developers use this scaffold to position an azide at a defined distance from the attachment point, improving synthetic control over conjugate topology and enabling modular assembly with complementary reactive partners. The combination of a terminal azide and a free carboxylic acid makes it convenient for preparing activated derivatives that can be carried into coupling steps used to generate labeled biomolecules or reagent libraries.

3. Surface Immobilization Chemistry

5-Azido-pentanoic acid is used to introduce azide functionality onto surfaces and solid supports through linker construction, enabling subsequent covalent attachment of alkyne-bearing molecules by click chemistry. Materials science teams and surface chemistry groups value the predictable five-carbon spacer length for tuning surface density and accessibility of immobilized ligands. In applications such as functionalized coatings, sensor interfaces, and affinity capture surfaces, the azide handle provides a robust platform for post-immobilization coupling without requiring direct handling of more reactive electrophiles during surface preparation.

4. Peptide and Probe Building Block

5-Azido-pentanoic acid is commonly incorporated as a functionalized amino acid-like fragment in synthetic routes to azide-functional peptides, peptide mimetics, and chemical probes where a terminal azide is required as a downstream handle. Medicinal chemistry and chemical biology teams use the compound to generate site-specific labeling points for later attachment of reporters, affinity groups, or other modular substituents. The presence of the carboxylic acid group supports its use in building linker segments that can be integrated into probe architectures while preserving the azide for orthogonal derivatization after assembly.

1. An Open-label, Single-center, Safety and Efficacy Study of Eyelash Polygrowth Factor Serum

2. Glucagonlike peptide 2 analogue teduglutide: stimulation of proliferation but reduction of differentiation in human Caco-2 intestinal epithelial cells

3. Low bone turnover and low BMD in Down syndrome: effect of intermittent PTH treatment

4. Proinsulin C-peptide and insulin: Limited pattern similarities of interest in inter-peptide interactions but no C-peptide effect on insulin and IGF-1 receptor signaling

5. Immune responses to homocitrulline-and citrulline-containing peptides in rheumatoid arthritis