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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Benzopyrazoles Indazoles

Chemical Profile of 4-ethynyl-1H-indazole (CAS No. 1093847-83-6)

4-ethynyl-1H-indazole, identified by the Chemical Abstracts Service registry number CAS No. 1093847-83-6, is a heterocyclic organic compound belonging to the indazole family. This molecule features a fused benzene and pyrrole ring system with an ethynyl substituent at the 4-position, making it a structurally intriguing entity with significant potential in pharmaceutical and materials science applications.

The chemical structure of 4-ethynyl-1H-indazole consists of a benzene ring fused to a pyrrole ring, with an acetylenic (-C≡CH) group attached to the 4-position of the benzene ring. This unique arrangement imparts distinct electronic and steric properties to the molecule, which are highly valuable for modulating biological targets and designing advanced materials. The presence of the ethynyl group enhances reactivity, allowing for further functionalization through cross-coupling reactions such as Suzuki-Miyaura or Sonogashira couplings, which are widely employed in drug discovery and polymer synthesis.

In recent years, 4-ethynyl-1H-indazole has garnered attention in the field of medicinal chemistry due to its versatile pharmacological properties. Studies have demonstrated its potential as a scaffold for developing small-molecule inhibitors targeting various disease-related pathways. Notably, research has explored its activity against enzymes involved in cancer metabolism, such as isocitrate dehydrogenase (IDH) mutants, which are known to play a critical role in tumor growth and progression. The indazole core is particularly recognized for its ability to interact with biological macromolecules, while the ethynyl moiety provides a handle for covalent bond formation—enhancing drug binding affinity and selectivity.

One of the most compelling aspects of 4-ethynyl-1H-indazole is its utility in designing photoactivatable probes for cellular imaging. The ethynyl group can be readily incorporated into biomolecules via click chemistry reactions, enabling the development of fluorescent or photocleavable probes that facilitate real-time tracking of biological processes. For instance, researchers have utilized derivatives of 4-ethynyl-1H-indazole to label proteins or nucleic acids in living cells, allowing for precise spatiotemporal control over probe activation. This approach has been instrumental in unraveling complex biological mechanisms, including protein-protein interactions and DNA replication dynamics.

The synthetic accessibility of 4-ethynyl-1H-indazole further underscores its importance in chemical research. The compound can be readily prepared through multi-step organic synthesis routes starting from commercially available precursors such as indole derivatives. Advances in catalytic methods have streamlined these processes, making large-scale production feasible for both academic and industrial applications. Additionally, computational modeling has been employed to optimize synthetic pathways, ensuring high yields and minimal byproduct formation—a critical consideration in pharmaceutical manufacturing.

In materials science, 4-ethynyl-1H-indazole has been investigated as a building block for constructing advanced polymers and organic semiconductors. The conjugated system inherent in its structure allows for efficient charge transport properties, making it suitable for applications in organic light-emitting diodes (OLEDs), photovoltaic cells, and field-effect transistors (OFETs). Researchers have demonstrated that polymers incorporating 4-ethynyl-1H-indazole units exhibit improved thermal stability and mechanical strength while maintaining excellent optoelectronic performance. These findings highlight the compound's potential as a key component in next-generation electronic devices.

The pharmacological profile of 4-ethynyl-1H-indazole extends beyond cancer therapeutics. Emerging evidence suggests its efficacy in modulating neurological disorders by interacting with neurotransmitter receptors or ion channels. For example, derivatives of this compound have shown promise in preclinical studies as potential treatments for neurodegenerative diseases such as Alzheimer's and Parkinson's disease. The ability of 4-ethynyl-1H-indazole to cross the blood-brain barrier further enhances its therapeutic appeal, opening avenues for central nervous system drug development.

Recent innovations in drug delivery systems have also leveraged 4-ethynyl-1H-indazole's chemical properties to enhance therapeutic efficacy. Nanoparticle-based formulations loaded with this compound have demonstrated improved bioavailability and targeted delivery to pathological sites. For instance, liposomes functionalized with 4-ethynyl-1H-indazole have been tested in clinical trials for localized treatment of inflammatory conditions without significant systemic side effects. Such advancements underscore the compound's adaptability across multiple domains of biomedical research.

The future prospects of 4-ethynyl-1H-indazole are promising, driven by ongoing interdisciplinary collaborations between chemists, biologists, and engineers. As synthetic methodologies continue to evolve, new derivatives with tailored functionalities will emerge, expanding their applications in drug discovery and materials science. Moreover, computational approaches such as artificial intelligence-assisted molecular design are expected to accelerate the identification of novel compounds based on 4-ethynyl-1H-indazole scaffolds—further propelling innovation in this field.

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