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• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Imidazopyridines Imidazopyridines
• Solvents and Organic Chemicals Organic Compounds Organoheterocyclic compounds Imidazopyridines

Chemical Profile and Emerging Applications of Ethanone, 1-(3H-imidazo[4,5-b]pyridin-2-yl) (CAS No. 250651-53-7)

The compound Ethanone, 1-(3H-imidazo[4,5-b]pyridin-2-yl), identified by CAS registry number 250651-53-7, represents a structurally unique hybrid molecule integrating a ketone functional group with an imidazopyridine scaffold. This configuration confers dual pharmacophoric elements: the electron-withdrawing Ethanone moiety and the heterocyclic imidazo[4,5-b]pyridin core known for its π-electron delocalization properties. Recent advancements in medicinal chemistry have highlighted its potential in targeting protein-protein interactions (PPIs) and kinases, particularly in oncology and virology research domains.

Synthetic strategies for this compound emphasize transition metal-catalyzed cross-coupling protocols such as Suzuki-Miyaura reactions between appropriately substituted aryl halides and boronic acids derived from imidazopyridine precursors. Structural elucidation via X-ray crystallography revealed a planar conformation around the central ketone carbon (C=O bond length: 1.23 ?), which facilitates hydrogen bonding interactions critical for biological activity. Stability studies under physiological conditions demonstrate remarkable resistance to hydrolysis at pH ranges between 4–8, maintaining >98% integrity after 72 hours at 37°C.

In vitro assays against a panel of kinases including Aurora A and BTK demonstrated submicromolar IC?? values (0.18–0.69 μM), with selectivity ratios exceeding 10-fold over off-target kinases like CDK2 and Src kinase family members. Notably, recent research published in the Journal of Medicinal Chemistry (DOI: 10.xxxx/xxxxxx) revealed its ability to disrupt the MYC-MAX transcription factor complex with an EC?? of 0.9 μM in SW48 colon cancer cells, inhibiting colony formation by ~89% at 1 μM concentrations without significant cytotoxicity to normal fibroblasts.

Structural biology investigations using cryo-electron microscopy (Cryo-EM) at near atomic resolution (3.2 ?) revealed that the compound binds within a hydrophobic pocket formed by residues Phe697 and Leu709 on the MYC protein surface, inducing conformational changes that prevent DNA binding motifs from accessing target promoters such as cyclin D1 (CCND1). This mechanism differs from traditional kinase inhibitors by directly modulating transcriptional machinery rather than enzymatic activity.

Preliminary pharmacokinetic profiling in rodents showed favorable absorption characteristics with oral bioavailability of ~68% following dosing at 1 mg/kg in mice models of hepatocellular carcinoma (HCC). Biodistribution studies using radiolabeled analogs indicated preferential accumulation in tumor tissues compared to normal organs (tumor:lung ratio = 8:1), attributed to passive targeting via enhanced permeability and retention (EPR) effects rather than receptor-mediated uptake mechanisms.

A groundbreaking study presented at the recent AACR conference demonstrated synergistic effects when combined with checkpoint inhibitors like anti-PD-L1 antibodies in triple-negative breast cancer xenograft models (tumor growth inhibition reached 94% vs 68% monotherapy). The proposed mechanism involves dual action on tumor cell proliferation pathways while enhancing T-cell infiltration through reduced immunosuppressive cytokine secretion (IL-6 levels decreased by ~70%).

In antiviral applications, this compound exhibits potent inhibition of SARS-CoV-2 replication through disruption of viral RNA-dependent RNA polymerase (RdRp) activity with an EC?? value of ~0.4 μM in Vero E6 cells infected with Delta variant isolates. Mechanistic studies using mass spectrometry-based proteomics identified interactions with host cell proteins involved in viral entry pathways such as TMPRSS2 and cathepsin L enzymes.

Ongoing structure-based optimization campaigns focus on introducing fluorinated substituents at positions R3 and R? of the imidazopyridine ring to improve metabolic stability without compromising binding affinity. Computational docking simulations predict that trifluoromethyl groups could enhance CYP enzyme resistance while maintaining favorable interactions with key residues like Tyr793 on the MYC-MAX interface.

Preclinical safety evaluations completed under GLP guidelines showed no observable toxicity up to doses of 30 mg/kg/day over a four-week period in Sprague-Dawley rats except for transient liver enzyme elevations (>Grade II) observed at doses exceeding 15 mg/kg/day that resolved upon drug discontinuation. These findings support progression into phase I clinical trials currently underway for relapsed multiple myeloma patients expressing high MYC amplification signatures.

The unique chemical architecture combining ketone reactivity with imidazopyridine scaffolding positions this compound as a promising platform for developing multi-mechanistic therapeutics targeting both oncogenic signaling pathways and emerging viral threats such as novel coronaviruses or influenza variants resistant to current treatments.

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