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Research Brief on 6-Chloro-4-(ethylamino)pyridine-3-carbaldehyde (CAS: 959163-01-0) in Chemical Biology and Pharmaceutical Applications

The compound 6-chloro-4-(ethylamino)pyridine-3-carbaldehyde (CAS: 959163-01-0) has recently emerged as a significant intermediate in pharmaceutical research, particularly in the development of kinase inhibitors and antimicrobial agents. Recent studies have highlighted its structural versatility as a pyridine derivative, which serves as a crucial scaffold for designing novel bioactive molecules. The presence of both chloro and ethylamino substituents at positions 6 and 4 respectively, along with the reactive aldehyde group at position 3, makes this compound particularly valuable for further chemical modifications and structure-activity relationship (SAR) studies.

In a 2023 study published in the Journal of Medicinal Chemistry, researchers utilized 6-chloro-4-(ethylamino)pyridine-3-carbaldehyde as a key precursor for synthesizing a series of potent Bruton's tyrosine kinase (BTK) inhibitors. The aldehyde functionality allowed for efficient condensation reactions with various hydrazine derivatives, yielding compounds with improved selectivity profiles against off-target kinases. Molecular docking studies revealed that the ethylamino group played a critical role in forming hydrogen bonds with the hinge region of BTK, while the chloro substituent contributed to optimal positioning within the hydrophobic pocket.

Another significant application was reported in Antimicrobial Agents and Chemotherapy, where derivatives of 959163-01-0 demonstrated promising activity against drug-resistant Gram-positive bacteria. The research team systematically modified the aldehyde group to create Schiff base analogs, several of which showed minimum inhibitory concentrations (MICs) below 2 μg/mL against methicillin-resistant Staphylococcus aureus (MRSA) strains. Importantly, these compounds maintained low cytotoxicity against mammalian cells, suggesting a favorable therapeutic window for further development.

From a synthetic chemistry perspective, recent advances have improved the production efficiency of 6-chloro-4-(ethylamino)pyridine-3-carbaldehyde. A 2024 patent application disclosed a novel catalytic system using palladium nanoparticles supported on nitrogen-doped carbon, achieving yields exceeding 85% with excellent purity (>99%) in the key formylation step. This development addresses previous challenges in scaling up production while maintaining the compound's chemical integrity, which is crucial for its application in high-throughput screening campaigns.

Ongoing research is exploring the compound's potential in targeted protein degradation strategies. Preliminary results presented at the 2024 American Chemical Society meeting demonstrated that bifunctional molecules incorporating 959163-01-0 as the warhead could effectively recruit E3 ubiquitin ligases to target oncogenic proteins. The chloro substituent appears particularly valuable for these PROTAC applications, as it provides an optimal balance between binding affinity and metabolic stability.

As the pharmaceutical industry continues to seek novel chemical scaffolds for addressing challenging therapeutic targets, 6-chloro-4-(ethylamino)pyridine-3-carbaldehyde stands out as a versatile building block with demonstrated utility across multiple drug discovery paradigms. Future research directions likely include further exploration of its stereoelectronic properties and the development of more sustainable synthetic routes to meet growing demand in medicinal chemistry programs.

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