3-Azidopropylamine hydrochloride | CAS 70017-54-8

3-Azidopropylamine hydrochloride is a small-molecule azide building block used as a versatile handle for copper-catalyzed azide–alkyne cycloaddition (CuAAC) and related click chemistry workflows. As an azide-bearing primary amine salt, it combines a reactive azide moiety for bioconjugation with an amine for downstream coupling to activated esters, isothiocyanates, aldehydes, or carboxylate-activated surfaces. Its compact structure and water-compatible salt form make it a common reagent for preparing azide-functional intermediates used in labeling, surface modification, and modular probe construction.

1. Protein And Peptide Labeling

3-Azidopropylamine hydrochloride is widely used to introduce an azide functional group onto proteins and peptides prior to click-based attachment of dyes, affinity tags, or imaging reporters. Researchers typically use the primary amine to link the azide-bearing spacer to biomolecules via standard amide-forming or thiol-reactive coupling strategies, producing azide-functional conjugates that can then be coupled to alkyne-bearing partners under CuAAC conditions. This approach is especially valuable when a defined linker length is required to preserve biomolecular recognition, enabling modular assembly of fluorescent probes, pull-down reagents, and analytical standards.

2. Surface and Material Functionalization

3-Azidopropylamine hydrochloride supports azide installation on polymers, nanoparticles, and biomaterial surfaces where subsequent click attachment of functional ligands is desired. The amine functionality enables grafting to activated surfaces or incorporation into surface modification chemistries, while the azide serves as the orthogonal reactive site for later coupling to alkyne-functional coatings, capture ligands, or reporter molecules. In materials science workflows, this reagent is commonly used to create clickable interfaces for building multicomponent coatings, patterning probes onto substrates, or generating functionalized particle platforms for assay development and imaging reagent preparation.

3. Linker Building For Probes

3-Azidopropylamine hydrochloride is frequently employed as an intermediate for constructing linker modules used in chemical biology probe design. The reagent’s azide allows rapid “late-stage” conjugation to alkyne-containing scaffolds such as fluorophores, biotin analogs, or affinity handles, helping teams streamline synthesis by separating azide installation from final labeling steps. Meanwhile, the primary amine enables attachment to carrier molecules or reactive intermediates, making it useful for generating consistent spacer-bearing reagents that improve reproducibility across probe batches and facilitate rapid exchange of targeting or reporting components.

4. DNA And Oligonucleotide Conjugates

3-Azidopropylamine hydrochloride is used in nucleic acid labeling strategies where azide functionality is introduced to support click conjugation to alkyne-tagged reporters or capture moieties. The amine group provides a convenient handle for coupling to modified oligonucleotides or to linker systems that are compatible with standard oligo modification workflows. This enables assembly of azide-functional DNA or RNA conjugates that can be rapidly decorated via click chemistry, supporting the creation of fluorescent detection reagents, hybridization assay components, and modular nucleic-acid-based research tools.