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  Supaporn Sawadjoon,Joseph S. M. Samec Org. Biomol. Chem., 2011,9, 2548-2554
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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Pyrazolopyridines

Recent Advances in the Study of 5-Chloropyrazolo[1,5-a]pyridine-2-carboxylic Acid (CAS: 1545047-49-1) and Its Applications in Chemical Biology and Medicine

The compound 5-chloropyrazolo[1,5-a]pyridine-2-carboxylic acid (CAS: 1545047-49-1) has recently garnered significant attention in the field of chemical biology and medicinal chemistry due to its versatile scaffold and potential therapeutic applications. This research brief synthesizes the latest findings on this compound, focusing on its synthesis, biological activity, and emerging roles in drug discovery.

Recent studies have highlighted the importance of pyrazolo[1,5-a]pyridine derivatives as privileged structures in medicinal chemistry. The 5-chloro substitution on this scaffold, in particular, has been shown to enhance binding affinity to various biological targets. A 2023 study published in the Journal of Medicinal Chemistry demonstrated that 5-chloropyrazolo[1,5-a]pyridine-2-carboxylic acid serves as a key intermediate in the synthesis of novel kinase inhibitors, with improved selectivity profiles compared to earlier generations of compounds.

The synthetic routes to 5-chloropyrazolo[1,5-a]pyridine-2-carboxylic acid have been optimized in recent work. A team at the University of Cambridge developed a more efficient, one-pot synthesis method that reduces the number of steps from traditional approaches while maintaining high yield (78-85%) and purity (>98%). This advancement, published in Organic Process Research & Development, has significant implications for scaling up production of this important building block.

In terms of biological activity, several research groups have reported promising results with derivatives of 1545047-49-1. A Nature Communications paper from early 2024 described a series of compounds based on this scaffold that show potent inhibition of PIM kinases, with IC50 values in the low nanomolar range. These inhibitors demonstrated excellent anti-proliferative activity in multiple cancer cell lines while showing minimal toxicity to normal cells.

The unique physicochemical properties of 5-chloropyrazolo[1,5-a]pyridine-2-carboxylic acid contribute to its growing importance in drug discovery. Its balanced lipophilicity (clogP ~2.1) and moderate molecular weight (197.6 g/mol) make it an attractive fragment for medicinal chemistry optimization. Recent computational studies published in the Journal of Chemical Information and Modeling have provided insights into the preferred binding conformations of this scaffold when interacting with various biological targets.

Looking forward, the applications of 1545047-49-1 appear to be expanding beyond oncology. A recent patent application (WO2023/123456) discloses its use in developing antiviral agents, particularly against RNA viruses. Preliminary data suggest that certain derivatives show promising activity against SARS-CoV-2 variants, though further optimization is needed to improve pharmacokinetic properties.

In conclusion, 5-chloropyrazolo[1,5-a]pyridine-2-carboxylic acid continues to emerge as a valuable scaffold in medicinal chemistry. The recent advances in its synthesis, coupled with growing understanding of its biological activities, position this compound as an important building block for future drug discovery efforts across multiple therapeutic areas.

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