2-(3-Amino-4-chlorobenzoyl)benzoic Acid: Properties & Uses
2-(3-Amino-4-chlorobenzoyl)benzoic Acid: Properties & Uses
2-(3-Amino-4-chlorobenzoyl)benzoic acid is a bifunctional aromatic compound bearing both a free amino group and a carboxylic acid moiety on a diaryl ketone scaffold, making it a versatile building block in pharmaceutical synthesis and medicinal chemistry research.
- Chemical Name
- 2-(3-Amino-4-chlorobenzoyl)benzoic acid
- SKU
- A189923
- Functional Groups
- Primary amine (–NH₂), carboxylic acid (–COOH), and ketone (C=O)
- Core Scaffold
- Diaryl ketone (benzophenone) with substituted aniline and benzoic acid rings
- Key Substituents
- 3-amino and 4-chloro groups on the benzoyl phenyl ring
- Supplier
- Aladdin Scientific
Chemical Structure and Physicochemical Properties
2-(3-Amino-4-chlorobenzoyl)benzoic acid belongs to the class of benzophenone carboxylic acids. Its molecular architecture comprises two aromatic rings connected through a carbonyl (ketone) bridge: one ring carries a free primary amino (–NH₂) group at the 3-position and a chlorine substituent at the 4-position, while the second ring bears a carboxylic acid (–COOH) group at the ortho position relative to the carbonyl linkage.
The simultaneous presence of three distinct functional groups—a nucleophilic amine, an electrophilic carbonyl, and an ionisable carboxylic acid—endows this compound with rich reactivity. The amine group can undergo acylation, diazotization, reductive amination, or cyclisation reactions; the carboxylic acid can form esters, amides, or anhydrides; and the ketone carbonyl is available for condensation chemistry. The ortho-carboxylic acid relative to the carbonyl is a structural motif reminiscent of anthranilic acid ketone precursors used in heterocyclic synthesis.
The electron-withdrawing chlorine on the benzoyl ring modulates the electron density of the adjacent amino group, subtly reducing its basicity compared to unsubstituted aniline derivatives, which has practical implications for selectivity in synthetic transformations.
Synthesis Relevance and Role as a Pharmaceutical Intermediate
Compounds of the 2-(aminobenzoyl)benzoic acid type are well-established precursors in the construction of polycyclic nitrogen-containing heterocycles, particularly acridines, acridinones, and related fused-ring systems. Cyclisation of the amine onto the adjacent ketone carbonyl, or condensation of the amine with external electrophiles while the carboxylic acid simultaneously participates in ring closure, provides efficient routes to diverse heterocyclic scaffolds that appear frequently in bioactive molecules.
The 4-chloro substituent adds significant synthetic value: chlorine is an excellent handle for palladium-catalysed cross-coupling reactions (Suzuki, Heck, Buchwald–Hartwig), nucleophilic aromatic substitution, and metal-mediated C–X bond activation. Researchers can therefore use this compound as a divergent intermediate, elaborating the chloro position independently of or in tandem with reactions at the amine or acid sites.
As a research reagent from Aladdin Scientific (SKU A189923), this compound supports early-stage drug discovery, target-focused library synthesis, and methodology development in academic and industrial laboratories.
Handling, Storage, and Laboratory Safety
As with all aromatic amine-containing compounds, appropriate laboratory safety precautions should be observed when handling 2-(3-Amino-4-chlorobenzoyl)benzoic acid. Primary aromatic amines may carry mutagenic potential, and researchers should consult the Safety Data Sheet (SDS) provided by Aladdin Scientific before use.
Standard recommended practices include handling in a well-ventilated fume hood, wearing appropriate personal protective equipment (nitrile gloves, safety glasses, and lab coat), and avoiding prolonged skin contact or inhalation of dust. Waste disposal should comply with local institutional and regulatory requirements for aromatic amine-containing chemical waste.
For storage, the compound should be kept in a tightly sealed container in a cool, dry location away from strong oxidising agents, strong acids, and strong bases. Specific storage temperature recommendations should be verified against the current product specification sheet available from Aladdin Scientific.
Applications in Research and Drug Discovery
The compound serves multiple roles in medicinal chemistry and chemical biology research. Its amine group makes it a candidate for structure–activity relationship (SAR) studies where the amino and chloro substituents can be independently varied to probe binding interactions with biological targets. The benzophenone core itself is a photoreactive pharmacophore used in photoaffinity labelling experiments, enabling covalent capture of protein–ligand interactions under UV irradiation.
Additionally, 2-(aminobenzoyl)benzoic acid scaffolds have appeared in the synthesis of dyes, pigments, and fluorescent probes, where the electron-donor amine and the electron-accepting carbonyl/acid groups create push–pull chromophore systems. Researchers working on anthraquinone or xanthene dye analogue programmes may find this compound a useful starting material.
In agrochemical research, chlorinated aromatic amines and their ketone derivatives are explored as intermediates toward active ingredients with herbicidal or fungicidal properties, further broadening the potential utility of A189923 beyond purely pharmaceutical contexts.
Frequently asked questions
What functional groups are present in 2-(3-Amino-4-chlorobenzoyl)benzoic acid and why are they synthetically important?
The compound contains three key functional groups: a primary aromatic amine (–NH₂), a ketone carbonyl (C=O), and a carboxylic acid (–COOH), plus an aryl chloride. This multi-functionality allows the molecule to participate in cyclisation reactions to form N-heterocycles, cross-coupling reactions at the C–Cl bond, and amide or ester bond formation at the carboxylic acid, making it a highly versatile synthetic intermediate.
How should 2-(3-Amino-4-chlorobenzoyl)benzoic acid (A189923) be stored to maintain its integrity?
The compound should be stored in a tightly sealed container in a cool, dry environment, away from strong oxidising agents, strong acids, and strong bases. Researchers should refer to the Aladdin Scientific product specification sheet and SDS for the precise storage temperature and any additional stability data specific to this lot.
Can 2-(3-Amino-4-chlorobenzoyl)benzoic acid be used as a precursor for heterocyclic synthesis?
Yes. The ortho relationship between the amine-bearing benzoyl group and the carboxylic acid, combined with the reactive ketone carbonyl, provides geometrically favourable conditions for intramolecular cyclisation to form acridine, acridinone, or related fused-ring heterocyclic systems. This scaffold type is widely used in medicinal chemistry and dye synthesis programmes.
What safety precautions are necessary when handling this compound in the laboratory?
Users should handle the compound in a well-ventilated fume hood, wear nitrile gloves, safety glasses, and a lab coat, and avoid inhalation of dust or prolonged skin contact. As an aromatic amine, the compound may carry mutagenic potential; researchers must consult the SDS provided by Aladdin Scientific before use and dispose of waste in accordance with local regulations.
References
- March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure, 4th ed.; Wiley-Interscience: New York, 1992. (General reference for functional-group reactivity and heterocyclic synthesis strategies.)
- Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry, 2nd ed.; Oxford University Press: Oxford, 2012. (Textbook reference for amine and carboxylic acid reactivity, carbonyl chemistry, and palladium-catalysed cross-coupling.)
- Aladdin Scientific. Product page: 2-(3-Amino-4-chlorobenzoyl)benzoic acid, SKU A189923. Retrieved from aladdin-e.com.
Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
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