Refernces
10.1021/jo200197g
The research focuses on the synthesis of pyridin-2(1H)-one derivatives, which are significant in organic chemistry and possess medicinal properties, including potential antitumor activity. The study aims to develop a simple and efficient method for the synthesis of these heterocyclic compounds using enamine cyclization. The researchers successfully synthesized stable reaction adducts (3a and 3b) from the nucleophilic vinylic substitution reaction of enaminone 3-dimethylamino-2-formyl acrylonitrile (1) with malononitrile and ethyl cyanoacetate, under mild conditions. Further reactions with aromatic amines led to the formation of enamines (4 and 5), which cyclized in the presence of a base to produce novel pyridin-2(1H)-one derivatives (8 and 9).
10.1021/op0580062
The research aimed to evaluate and compare the safety and catalytic effectiveness of five catalysts in promoting imidazolide couplings, a reaction type crucial for amide bond formation in pharmaceutical synthesis. The catalysts tested were 1-hydroxybenzotriazole (HOBt), 6-chloro-1-hydroxybenzotriazole (Cl-HOBt), 1-hydroxy-7-azabenzotriazole (HOAt), 2-hydroxypyridine (HOPy), and the newly identified 2-hydroxy-5-nitropyridine (NO2-HOPy). The study assessed reaction rate enhancement, shock sensitivity, and differential scanning calorimetry (DSC) data. The findings indicated that NO2-HOPy emerged as a safe, effective, and readily available alternative to the commonly used HOBt, offering a favorable balance between catalytic performance and safety. The research concluded that NO2-HOPy is a promising catalyst for imidazolide couplings, particularly given its lack of shock sensitivity and relatively high decomposition onset temperature, making it a safer option compared to the more hazardous HOAt.
10.1016/j.bmcl.2007.04.078
The research investigates the structure–activity relationship (SAR) of over 50 derivatives of octahydrobenzo[g]quinoline (obeline)-type somatostatin sst1 receptor antagonists, with a focus on modifying the arylpiperazine moiety. The goal was to enhance the sst1 receptor affinities to a subnanomolar level while improving selectivities over the sst2 receptor subtype, without compromising the favorable drug-like properties of the lead molecule. Key chemicals used include various heteroaryl moieties, substituted phenylpiperazines, and cyclic secondary amines. The study found that the best derivatives achieved subnanomolar sst1 affinities and >10,000-fold selectivities over sst2, with promising pharmacokinetic properties. Notably, the introduction of a 4-cyano substituent and a 2-pyridone moiety significantly improved sst1 affinity, while benzothiadiazole derivatives also showed high affinity and selectivity. The research concludes that the arylpiperazine moiety is crucial for optimizing the binding properties of obeline-type sst1 receptor antagonists.
10.1016/j.cclet.2013.11.026
The research focuses on the synthesis of benzimidazole-bearing 2-pyridone derivatives as potential antimicrobial agents to combat multi-drug resistance in bacteria and fungi. The study employed molecular hybridization to combine the bioactive properties of 2-pyridones and benzimidazoles into a single molecular framework. The synthesis involved the preparation of intermediate compounds through reactions with cyanoacetic acid hydrazide and Knoevenagel products, followed by condensation with aromatic aldehydes in boiling ethanol. The synthesized compounds were characterized using elemental analysis, infrared (IR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and mass spectrometry. The antimicrobial activity of the compounds was evaluated in vitro using the broth dilution method against various bacterial and fungal strains, with chloramphenicol and ketoconazole as standard drugs. The study also assessed the cytotoxic effects of the most potent compounds on human cancer cell lines. The findings indicated that compounds with electron-withdrawing groups, particularly at the meta or para position of the phenyl ring, exhibited the highest antibacterial activity, while a chlorine-substituted compound showed the most potent antifungal activity, with none of the tested compounds showing significant cytotoxic effects.
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