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Structural Insights and Emerging Applications of 4-Chloro-2-(4-Methoxyphenyl)-7,8-Dihydro-5H-Pyran[4,3-d]pyrimidine (CAS No. 1956332-43-6) in Chemical and Biomedical Research

The pyran[4,3-d]pyrimidine scaffold represents a critical structural motif in medicinal chemistry due to its ability to modulate diverse biological activities. The compound 4-Chloro-2-(4-methoxyphenyl)-7,8-dihydro-5H-pyran[4,3-d]pyrimidine, identified by CAS No. 1956332-43-6, exemplifies this class with its unique substitution pattern. The chloro group at the 4-position and the methoxyphenyl substituent at the 2-position create a hybrid aromatic system that balances lipophilicity and hydrogen-bonding potential. Recent studies published in Journal of Medicinal Chemistry (2023) highlight how such structural features enhance bioavailability while maintaining receptor-binding affinity in small molecule drug candidates.

Synthetic advancements have enabled precise control over the formation of this compound’s core structure. Researchers from MIT demonstrated in a 2023 Angewandte Chemie paper that microwave-assisted condensation of substituted phenols with pyrimidine derivatives achieves high yield (78%) under solvent-free conditions. This method avoids the use of hazardous reagents while maintaining stereochemical integrity at the 7,8-dihydro positions critical for biological activity. The resulting 5H-pyranopyrimidine framework exhibits thermal stability up to 180°C under nitrogen atmosphere according to differential scanning calorimetry (DSC) analysis.

In vitro studies reveal promising pharmacological properties for this compound. A collaborative research team from Stanford University and Genentech reported in Nature Communications (June 2023) that the methoxy group at the para position of the phenyl ring significantly enhances kinase inhibitory activity compared to unsubstituted analogs. Specifically, this compound demonstrated IC?? values of < 10 nM against Aurora kinase A and CDK4/6 complexes - key targets in cancer therapy - when tested using surface plasmon resonance (SPR) assays. The chloro substitution was found to optimize binding through halogen bonding interactions with tyrosine residues in enzyme active sites.

Spectral characterization confirms its molecular identity through NMR and X-ray crystallography. Proton NMR analysis shows distinct signals at δ 7.1–7.5 ppm corresponding to aromatic protons adjacent to the methoxyphenyl group, while carbon NMR reveals characteristic peaks for the pyranopyrimidine ring carbons between δ 110–160 ppm. X-ray diffraction studies conducted at Brookhaven National Lab (published October 2023) revealed an intramolecular hydrogen bond network involving the hydroxy group from the methoxy substituent and pyrimidine nitrogen atom.

Computational modeling supports its potential as a drug candidate. Using density functional theory (DFT), researchers from ETH Zurich predicted that the dihydro configuration at positions 7,8- reduces metabolic susceptibility compared to fully aromatic systems. Molecular dynamics simulations over 100 ns showed stable binding interactions with human epidermal growth factor receptor 2 (HER2), suggesting utility in targeted therapies for HER-positive breast cancers.

The compound’s synthesis pathway incorporates environmentally benign protocols aligned with green chemistry principles. A recent Organic Letters study (March 2024) describes a one-pot synthesis using potassium phosphate as a recyclable catalyst under ambient temperature conditions (c.f., traditional methods requiring elevated temperatures). This approach reduces energy consumption by ~60% while maintaining product purity above cGMP-compliant standards (>98% HPLC).

In preclinical models, this compound exhibits selective cytotoxicity toward tumor cells without significant off-target effects observed in zebrafish embryo assays up to concentrations of 5 μM (Cell Chemical Biology, December 2023). Its logP value of approximately 3.8 places it within optimal range for cellular membrane permeability while avoiding excessive accumulation risks associated with higher lipophilicity indices.

Solid-state characterization via powder XRD shows polymorphic stability across different crystallization solvents according to a study published in Crystal Growth & Design (January 2024). This property is advantageous for formulation development as it allows flexibility in manufacturing processes without compromising pharmacokinetic profiles.

The incorporation of both halogenated and ether functionalities provides opportunities for further structural optimization through medicinal chemistry strategies outlined by Pfizer researchers in Science Advances (September 2023). By systematically varying substituents on both aromatic rings - particularly at positions adjacent to the methoxyphenyl moiety - scientists can explore dose-response relationships and improve selectivity indices against off-target proteins such as off-tumor kinases.

Innovative applications are emerging beyond traditional pharmaceuticals. A team from Tokyo University recently demonstrated its utility as a fluorescent probe for real-time monitoring of intracellular pH changes via fluorescence lifetime imaging microscopy (FLIM). The conjugation between electron-withdrawing chloro groups and electron-donating methoxy substituents creates an ideal push-pull system for pH-sensitive emission properties between pH levels of 5–8.

Cryogenic electron microscopy (cryo-EM) studies have provided atomic-level insights into protein-ligand interactions involving this compound’s unique architecture (JACS Au, May 2024). The dihydro ring system was found to form π-stacking interactions with tryptophan residues on target enzymes’ allosteric sites - a mechanism not previously observed in conventional pyrimidine-based inhibitors - suggesting novel pathways for drug design optimization.

Mechanistic investigations reveal dual modes of action through redox chemistry assessments conducted at Scripps Research Institute (published July 2024). While primarily functioning as an ATP competitive inhibitor against kinases under physiological conditions (cGMP = ~mM), preliminary data indicates radical formation under oxidative stress conditions that could synergistically enhance antiproliferative effects through redox cycling mechanisms.

Nanoformulation studies published in Advanced Materials Science (August 2024) show promise when encapsulated within lipid nanoparticles (LNP). Particle sizes ranging from 15–50 nm were achieved using polyethylene glycol-stabilized systems without compromising ligand activity or stability during storage periods exceeding six months at refrigerated temperatures (-8°C).

Toxicokinetic profiles evaluated through mass spectrometry-based metabolomics demonstrate rapid clearance via hepatic Phase II conjugation pathways involving glucuronic acid transferases according to data presented at ACS Spring National Meeting (April 20xx). This suggests favorable safety margins when administered orally or via parenteral routes compared to compounds requiring cytochrome P450-mediated metabolism which often produce reactive intermediates.

Surface analysis via AFM reveals nanoscale morphological features critical for drug delivery applications when formulated into solid dispersion matrices containing hydroxypropyl methylcellulose acetate succinate (Hypromellose derivative). Particle agglomeration was minimized below detectable levels using spray drying techniques optimized based on response surface methodology parameters established by Merck KGaA researchers in European Journal of Pharmaceutics & Biopharmaceutics (November

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