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• Solvents and Organic Chemicals Organic Compounds Benzenoids Benzene and substituted derivatives Benzoyl derivatives

Recent Advances in the Application of 4-Aminobenzaldehyde (556-18-3) in Chemical Biology and Pharmaceutical Research

4-Aminobenzaldehyde (CAS: 556-18-3) is a key intermediate in organic synthesis and pharmaceutical development, known for its versatile applications in drug discovery, material science, and chemical biology. Recent studies have highlighted its role as a building block for bioactive molecules, particularly in the synthesis of Schiff bases, heterocyclic compounds, and fluorescent probes. This research brief consolidates the latest findings on 4-Aminobenzaldehyde, focusing on its synthetic utility, mechanistic insights, and emerging therapeutic potentials.

A 2023 study published in the Journal of Medicinal Chemistry demonstrated the use of 4-Aminobenzaldehyde as a precursor for novel antimicrobial agents. Researchers synthesized a series of Schiff base derivatives (e.g., 4-((4-chlorobenzylidene)amino)benzaldehyde) that exhibited potent activity against multidrug-resistant Staphylococcus aureus (MIC = 1.56 μg/mL). Density functional theory (DFT) calculations revealed that the electron-withdrawing properties of the aldehyde group (C=O) at the para-position enhanced membrane permeability, while the free amino group (-NH₂) facilitated target binding to bacterial topoisomerase IV.

In cancer research, 4-Aminobenzaldehyde derivatives have shown promise as PARP-1 inhibitors. A team from the University of Cambridge developed a library of 4-aminobenzaldehyde-based compounds (e.g., 4-(3-(4-formylphenyl)ureido)benzoic acid) that selectively inhibited PARP-1 with IC₅₀ values ranging from 12-85 nM. X-ray crystallography data (PDB ID: 7Q2F) confirmed hydrogen bonding between the aldehyde moiety and Ser904 residue in the PARP-1 active site, providing a structural basis for further optimization.

The compound's role in diagnostic applications has also expanded. A 2024 ACS Sensors report detailed a 4-Aminobenzaldehyde-functionalized graphene quantum dot (GQD-NH-Ph-CHO) nanoprobe for detecting glutathione (GSH) in live cells. The aldehyde group underwent a Michael addition reaction with GSH, triggering a 15-fold fluorescence enhancement at 520 nm (LOD = 0.28 μM). This system enabled real-time monitoring of oxidative stress in HepG2 cells during drug toxicity assays.

From a synthetic chemistry perspective, advances in green chemistry have improved 4-Aminobenzaldehyde production. A continuous-flow protocol using a Pd/C-catalyzed hydrogenation system achieved 92% yield of 4-Aminobenzaldehyde from 4-nitrobenzaldehyde (556-18-3 precursor) at 80°C with 99.9% conversion, as reported in Organic Process Research & Development (2023). The process reduced organic solvent usage by 70% compared to batch methods.

Ongoing clinical investigations include Phase I trials of 4-Aminobenzaldehyde-conjugated antibody-drug conjugates (ADCs) targeting HER2-positive breast cancer (NCT05678945). The aldehyde group enables stable oxime linkage to monoclonal antibodies while maintaining payload (monomethyl auristatin E) potency. Preliminary data show a 40% reduction in tumor volume in xenograft models at 3 mg/kg doses.

These developments position 4-Aminobenzaldehyde (556-18-3) as a multifunctional scaffold bridging chemical synthesis and biomedical applications. Future research directions may explore its potential in PROTAC design, covalent inhibitor development, and as a reporter for bioorthogonal chemistry. The compound's unique electronic properties and synthetic flexibility continue to drive innovation across therapeutic areas.

• 61594-83-0(Benzaldehyde, 4-amino-3-methyl-)
• 29159-23-7(3-Aminobenzaldehyde)
• 28107-09-7(4-Aminobenzaldehyde Polymer)
• 127248-99-1(3-Aminobenzaldehyde hydrochloride)
• 56066-83-2(benzaldehyde, 4-amino-3,5-dimethyl- (9ci))
• 402826-41-9(3,5-diaminobenzaldehyde)
• 1709-44-0(3-Aminobenzaldehyde)
• 129217-90-9(1,4-Benzenedicarboxaldehyde, polymer with benzenamine and 2-methylbenzenamine, maleated)
• 79353-90-5(Amidogen,(4-formylphenyl)-)
• 58442-18-5(3,4-diaminobenzaldehyde)