• 1. Structure–activity relationships of valine, tert-leucine, and phenylalanine amino acid-derived synthetic cannabinoid receptor agonists related to ADB-BUTINACA, APP-BUTINACA, and ADB-P7AICA
  Eric Sparkes,Elizabeth A. Cairns,Richard C. Kevin,Felcia Lai,Katharina Elisabeth Grafinger,Shuli Chen,Marie H. Deventer,Ross Ellison,Rochelle Boyd,Lewis J. Martin,Iain S. McGregor,Roy R. Gerona,David E. Hibbs,Volker Auw?rter,Michelle Glass,Christophe Stove,Samuel D. Banister RSC Med. Chem. 2022 13 156
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  Yue-Yang Ji,Zhi-Long Wang,Fang-Ning Pei,Jun-Jie Shi,Jiao-Jiao Li,Hendra Gunosewoyo,Fan Yang,Jie Tang,Xin Xie,Li-Fang Yu Med. Chem. Commun. 2019 10 2131
• 3. Novel potent HIF-1 inhibitors for the prevention of tumor metastasis: discovery and optimization of 3-aryl-5-indazole-1,2,4-oxadiazole derivatives
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  Chris S. Hawes,Paul E. Kruger RSC Adv. 2014 4 15770
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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Benzopyrazoles Indazoles

Indazole-3-carboxylic acid (CAS No. 4498-67-3): A Key Intermediate in Modern Pharmaceutical Research

Indazole-3-carboxylic acid, identified by the chemical formula C?H?NO? and assigned the CAS number 4498-67-3, is a significant intermediate in the synthesis of various pharmaceutical compounds. This heterocyclic organic compound has garnered considerable attention in the field of medicinal chemistry due to its versatile structural framework, which allows for modifications that can yield bioactive molecules with potential therapeutic applications.

The structural motif of Indazole-3-carboxylic acid consists of a fused benzene and pyridazine ring system, with a carboxylic acid functional group attached to the third position of the indazole ring. This unique arrangement provides a scaffold that is conducive to further chemical transformations, making it a valuable building block for drug discovery programs. The presence of both aromatic and heteroaromatic rings enhances its interactions with biological targets, which is a crucial factor in designing molecules with improved pharmacokinetic and pharmacodynamic properties.

In recent years, Indazole-3-carboxylic acid has been extensively studied for its role in developing novel therapeutic agents. One of the most notable areas of research involves its application in the synthesis of indazole derivatives that exhibit antimicrobial and antiviral activities. For instance, studies have demonstrated that compounds derived from Indazole-3-carboxylic acid can inhibit the replication of certain viruses by interfering with their polymerase enzymes. This has opened up new avenues for the development of antiviral drugs that could be effective against emerging pathogens.

Moreover, Indazole-3-carboxylic acid has been explored as a precursor in the synthesis of kinase inhibitors, which are critical in treating cancers and inflammatory diseases. The indazole core is known to interact with ATP-binding pockets of kinases, thereby modulating their activity. Researchers have leveraged the flexibility of Indazole-3-carboxylic acid’s structure to design molecules that selectively target specific kinases, reducing side effects associated with non-selective inhibitors. Such targeted therapies have shown promise in preclinical studies and are being evaluated in clinical trials for various malignancies.

The compound’s utility extends beyond oncology; it has also been investigated for its potential in central nervous system (CNS) drug development. Indazole derivatives have demonstrated neuroprotective effects in models of neurodegenerative diseases such as Alzheimer’s and Parkinson’s disease. The ability of these derivatives to cross the blood-brain barrier and exert their effects within the CNS makes them attractive candidates for therapeutic intervention. Preclinical studies have highlighted their potential to mitigate oxidative stress and inflammation, key pathological features associated with these conditions.

Another area where Indazole-3-carboxylic acid has made significant contributions is in the development of anti-inflammatory agents. The indazole scaffold can be modified to produce molecules that inhibit inflammatory cytokines and enzymes, offering relief from chronic inflammatory disorders such as rheumatoid arthritis and inflammatory bowel disease. Recent research has shown that certain indazole derivatives can modulate immune responses by interacting with specific receptors on immune cells, thereby reducing inflammation without compromising the body’s ability to fight infections.

The synthetic pathways involving Indazole-3-carboxylic acid are diverse and well-documented. One common method involves the oxidation of indazolylamine derivatives, followed by carboxylation at the third position of the indazole ring. Advances in catalytic systems have enabled more efficient and environmentally friendly synthetic routes, reducing waste generation and improving yields. These innovations align with the growing emphasis on sustainable chemistry practices in pharmaceutical manufacturing.

In conclusion, Indazole-3-carboxylic acid (CAS No. 4498-67-3) is a multifaceted intermediate with broad applications in pharmaceutical research. Its unique structural properties make it an indispensable tool for synthesizing bioactive molecules targeting various diseases, including cancer, viral infections, neurodegenerative disorders, and inflammatory conditions. As research continues to uncover new therapeutic possibilities, Indazole-3-carboxylic acid will undoubtedly remain a cornerstone in medicinal chemistry innovation.

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