4-Methoxy-beta-naphthylamine contains a methoxy-substituted β-naphthyl ring bearing a primary aniline functional group, classifying it as an aromatic amino compound rather than an amino acid or amino acid derivative. The molecule features a conjugated naphthalene system that can participate in electrophilic aromatic substitution and a nucleophilic -NH2 group that can undergo typical aniline transformations such as diazotization to form diazonium intermediates, while the para-oriented methoxy substituent modulates ring electron density. In research and synthesis contexts, it is used as an aromatic building block for preparing substituted naphthylamine derivatives, labeling reagents, and heteroaryl or azo-type intermediates that can be further functionalized for analytical method development and chemical biology probes.
CAT No: CP26939
CAS No:2764-95-6
Synonyms/Alias:4-Methoxy-2-naphthylamine;2764-95-6;4-methoxynaphthalen-2-amine;4-methoxy-2-naphthalenamine;4-Methoxybeta-naphthylamine;ACMC-20ac3y;AC1L45JR;M9894_ALDRICH;4-methoxy-beta-naphthylamine;3-amino-1-methoxynaphthalene;2-Naphthalenamine,4-methoxy-;M9894_SIGMA;SCHEMBL535685;CTK4G0022;MolPort-003-958-879;SFKZPTYRENGBTJ-UHFFFAOYSA-N;ZINC403090;ANW-66620;AKOS016004958;AN-7434;AK-34488;CJ-03796;KB-39489;OR017670;OR156366
4-Methoxy-beta-naphthylamine is an aromatic amine bearing a methoxy-substituted β-naphthyl ring, used as a functional building block in chemical biology and analytical chemistry workflows where an aniline handle is required for derivatization, coupling, or detector-compatible labeling. Its rigid polyaromatic scaffold supports strong chromatographic and spectroscopic detectability, while the primary amine enables downstream formation of amide, sulfonamide, or diazo-related derivatives depending on the chosen chemistry. In practice, researchers select this scaffold when they need a stable, non-peptidic aromatic tag that can be incorporated into synthetic intermediates or used to generate colored/UV-active derivatives for method development.
1. Analytical Derivatization
4-Methoxy-beta-naphthylamine is frequently used to prepare UV/visible-detectable derivatives for analytical method development, particularly in workflows where aromatic amine tags improve signal response and chromatographic behavior. Analytical chemists and method-development teams use the primary aniline functionality to generate stable derivative forms that can be monitored by HPLC/UPLC with UV detection, supporting quantification and impurity profiling in small-molecule analysis. The β-naphthyl aromatic core provides strong absorbance, making it a practical choice for building derivatization schemes that require reproducible detector response.
2. Chemical Biology Labeling
4-Methoxy-beta-naphthylamine serves as an aromatic amine scaffold for chemical biology labeling strategies that rely on amine-reactive coupling or subsequent conversion into reactive intermediates for probe construction. Researchers use it as a starting unit to introduce an aniline-based handle into labeling reagents, enabling attachment to other functional partners such as carboxylic acids or activated esters through standard coupling chemistries. This approach is commonly adopted in laboratories developing small-molecule probes, affinity reagents, or tagged intermediates where a robust polyaromatic moiety is advantageous for tracking by chromatography or spectroscopy.
3. Pharmaceutical Intermediate Development
4-Methoxy-beta-naphthylamine is widely used as a pharmaceutical intermediate building block for the preparation of downstream aromatic amine derivatives that appear in medicinal chemistry programs and specialty chemical manufacturing. Process and R&D chemists rely on the aniline functionality to enable conversion into protected or activated forms, supporting the synthesis of heteroaryl/aryl amide motifs and related nitrogen-containing intermediates. The methoxy-substituted naphthalene scaffold is particularly valued when a rigid, electron-rich aromatic region is required to tune physicochemical properties of later-stage intermediates.
4. Dye And Pigment Precursors
4-Methoxy-beta-naphthylamine is also used as a precursor in dye and pigment-related synthesis, where aromatic amines are transformed into colored products or intermediate chromophore units. Specialty chemical manufacturers and formulation chemists employ the aniline group as a key functional entry point for constructing conjugated aromatic structures that contribute to color development and lightfastness characteristics in final materials. This application is especially relevant when the β-naphthyl framework is chosen to deliver strong chromophoric behavior and consistent batch-to-batch performance in downstream colorant production.
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