Day: October 12, 2022

Beddoe, Samuel V. F.; Lonergan, Rhona F.; Pitak, Mateusz B.; Price, Jason R.; Coles, Simon J.; Kitchen, Jonathan A.; Keene, Tony D. published the artcile< All about that base: investigating the role of ligand basicity in pyridyl complexes derived from a copper-Schiff base coordination polymer>, Recommanded Product: 2,4-Bipyridine, the main research area is copper hydroxybenzylideneaminophenol pyridine benzimidazole complex preparation; crystal structure copper hydroxybenzylideneaminophenol pyridine benzimidazole complex.

The role of ligand basicity in complex formation was studied using monodentate pyridyls or benzimidazole (mP) in combination with a solution-stable species derived form a coordination polymer, [Cu(L)] (L = 2-(2-hydroxybenzylidene-amino)phenol). The 12 [Cu(L)(mP)n] generated, combined with the {[Cu(L)]2(pP)} complexes from the authors’ previous work (pP is a polypyridyl ligand), allow the authors to gauge the likelihood of complex formation based on the pKa of the conjugate acid of the pyridyl ligands and Hammett parameter, σ. Above pKa ≈ 4.5, complexes are formed where the only ligands are L2- and mP or pP and the packing interactions are predominantly van der Waals. Below this value, complex formation is unlikely unless there are addnl. oxygen ligands in the Jahn-Teller axis of the Cu(II) ion. The structures of two literature [Cu(L)(bP)], where bP is a chelating bidentate pyridyl ligand are also reexamined to resolve the positional disorder in the [Cu(L)] moiety.

Dalton Transactions published new progress about Crystal structure. 581-47-5 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Recommanded Product: 2,4-Bipyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Soczewka, Piotr; Tribouillard-Tanvier, Deborah; di Rago, Jean-Paul; Zoladek, Teresa; Kaminska, Joanna published the artcile< Targeting copper homeostasis improves functioning of vps13δ yeast mutant cells, a model of VPS13-related diseases>, Name: 2-Mercaptopyridinen-oxide sodiumsalt, the main research area is CCC2 VPS13A CTR1 cox11 Parkinson Menke Wilson disease; CCC2; CTR1; FET3; VPS13; copper homeostasis; disulfiram; elesclomol; pyrithione; yeast model, neurodegeneration.

Ion homeostasis is crucial for organism functioning, and its alterations may cause diseases. For example, copper insufficiency and overload are associated with Menkes andWilsons diseases, respectivley, and iron imbalance is observed in Parkinsons and Alzheimers diseases. To better understand human diseases, Saccharomyces cerevisiae yeast are used as a model organism. In our studies, we used the vps13δ yeast strain as a model of rare neurol. diseases caused by mutations in VPS13A-D genes. In this work, we show that overexpression of genes encoding copper transporters, CTR1, CTR3, and CCC2, or the addition of copper salt to the medium, improved functioning of the vps13δ mutant. We show that their mechanism of action, at least partially, depends on increasing iron content in the cells by the copper-dependent iron uptake system. Finally, we present that treatment with copper ionophores, disulfiram, elesclomol, and sodium pyrithione, also resulted in alleviation of the defects observed in vps13δ cells. Our study points at copper and iron homeostasis as a potential therapeutic target for further investigation in higher eukaryotic models of VPS13-related diseases.

International Journal of Molecular Sciences published new progress about Alzheimer disease. 3811-73-2 belongs to class pyridine-derivatives, and the molecular formula is C5H4NNaOS, Name: 2-Mercaptopyridinen-oxide sodiumsalt.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Bin; Yong, Guoping published the artcile< The positional isomeric effects induced various phosphorescence: Switchable properties through acid-base vapor stimulation>, Category: pyridine-derivatives, the main research area is positional isomer phosphorescence switchable acid base vapor; chloroimidazopyridinylpyridinylpropenone preparation.

Three novel positional isomers, namely (E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-1-(pyridin-2-yl)prop-2-en-1-one , (E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-1-(pyridin-3-yl)prop-2-en-1-one and (E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-1-(pyridin-4-yl)prop-2-en-1-one, were obtained through a mild approach. Powder x-ray diffraction patterns demonstrate their various stacking structures, attributed to positional isomeric effects. Furthermore, these positional isomers exhibit different phosphorescent colors and quantum yields. These positional isomers also reveal reversible phosphorescent color switching in the response to acid-base vapor stimuli. The present work provides a promising approach for synthesizing organic materials and a new access to develop dynamic functional materials which can be reversibly switched between different phosphorescence based on external acid-base vapor stimuli.

Journal of Molecular Structure published new progress about Acids Role: RGT (Reagent), RACT (Reactant or Reagent). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Dallaston, Madeleine A.; Brusnahan, Jason S.; Wall, Craig; Williams, Craig M. published the artcile< Thermal and Sensitiveness Determination of Cubanes: Towards Cubane-Based Fuels for Infrared Countermeasures>, Recommanded Product: 2-Mercaptopyridinen-oxide sodiumsalt, the main research area is cubane fuel IR countermeasure thermal sensitivity determination; Yoshida; cubane; energetic materials; infrared; pyrotechnics.

As IR seeking technol. evolves, threats are better able to distinguish defensive IR flares from true targets. Spectrally matched flares, which generally employ carbon-based fuels, are better able to decoy some advanced missiles by more closely mimicking the IR emission of the target. Cubane is a high-energy carbon-based scaffold which may be suitable for use as a fuel in spectrally matched flares. The enthalpy of formation and strain energy of a series of cubanes was predicted in silico, and their thermal and impact stability examined All were found to undergo highly exothermic decomposition in sealed cell differential scanning calorimetry, and two cubanes subsequently underwent quant. sensitiveness testing. Despite their F of I values being in the secondary explosive range, cubane-1,4-dicarboxylic acid (F of I = 70) and 4-carbamoylcubane-1-carboxylic acid (F of I = 90) were identified as potentially useful fuels for pyrotechnic IR countermeasure flare formulations.

Chemistry – A European Journal published new progress about Explosives. 3811-73-2 belongs to class pyridine-derivatives, and the molecular formula is C5H4NNaOS, Recommanded Product: 2-Mercaptopyridinen-oxide sodiumsalt.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gudmundsson, Kristjan S.; Hinkley, Jack M.; Brieger, Michael S.; Drach, John C.; Townsend, Leroy B. published the artcile< An improved large-scale synthesis of 2-amino-4-chloropyridine and its use for the convenient preparation of various polychlorinated 2-aminopyridines>, Category: pyridine-derivatives, the main research area is aminochloropyridine preparation chlorination; polychlorinated aminopyridine preparation; pyridine amino polychlorinated preparation.

An efficient large scale synthesis of 2-amino-4-chloropyridine (I) has been achieved through a modification of existing literature procedures. I was used to prepare the previously unreported 2-amino-4,5-dichloropyridine. The known 2-amino-3,4-dichloropyridine and 2-amino-3,4,5-trichloropyridine were prepared from I by new routes and in higher yields than previously reported.

Synthetic Communications published new progress about 188577-68-6. 188577-68-6 belongs to class pyridine-derivatives, and the molecular formula is C5H4Cl2N2, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

de Assis, Ellen Lima; Silveira, Felipe Dantas; da Ponte, Alan Victor Araujo; Regis, Romulo Rocha published the artcile< A Systematic Review of the Potential Effects of Lippia sidoides on Dental Plaque and Periodontal Diseases>, Formula: C21H38ClN, the main research area is Lippia sidoides dental plaque periodontal disease potential effect.

Lippia sidoidesis a typical shrub from Brazil that has been used in traditional medicine. This is a systematic review on the effect of L. sidoidesfor controlling dental plaque, gingivitis, and periodontitis. A database search through May 2021 in Medline/PubMed, SCOPUS, BVS, and Web of Science identified 711 reports of which 17 met our inclusion criteria. Five randomized controlled trials and three animal studies were included that compared L. sidoides-based products (toothpaste, mouthrinse, and gel) to cetylpyridinium chloride, chlorhexidine, and placebo products. Among the human studies, a significant antiplaque effect after treatment with L. sidoides-based products was observed in three studies and an antigingivitis effect in two studies, similar to chlorhexidine-based products. One study found superior dental plaque reduction compared to cetylpyridinium chloride mouthrinse. Only one study testing a L. sidoidesgel found no antiplaque effect. Among the animal studies, an L. sidoidesmouthrinse significantly reduced calculus in two studies, inflammatory infiltrate in one study, and plaque bacteria and gingivitis in one study. An L. sidoidesgel significantly reduced alveolar bone loss and inflammatory response in one study in which mice were submitted to ligature-induced periodontal disease. In general, L. sidoides-based products were effective in reducing dental plaque and calculus formation, as well as clin. signs of gingivitis. As most studies present methodol. limitations, these results should be interpreted carefully. Further clin. trials with greater methodol. accuracy and control of biases are necessary for the use of L. sidoides-based products in humans to be viable in clin. practice.

Planta Medica published new progress about Alveolar bone. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Formula: C21H38ClN.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Tessarolo, Jacopo; Lee, Haeri; Sakuda, Eri; Umakoshi, Keisuke; Clever, Guido H. published the artcile< Integrative Assembly of Heteroleptic Tetrahedra Controlled by Backbone Steric Bulk>, Recommanded Product: 3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine, the main research area is palladium fluorenonedipyridyl cage complex preparation luminescence; crystal structure palladium fluorenonedipyridyl cage complex.

A bent fluorenone-based dipyridyl ligand LA reacts with PdII cations to a solvent-dependent dynamic library of [PdnL2n] assemblies, constituted by a [Pd3LA6] ring and a [Pd4LA8] tetrahedron as major components, and a [Pd6LA12] octahedron as minor component. Introduction of backbone steric hindrance in ligand LB allows exclusive formation of the [Pd6LB12] octahedron. Combining equimolar amounts of both ligands results in integrative self-sorting to give an unprecedented [Pd4LA4LB4] heteroleptic tetrahedron. Key to the non-statistical assembly outcome is exploiting the structural peculiarity of the [Pd4L8] tetrahedral topol., where the four lean ligands occupy two doubly bridged edges and the bulky ligands span the four remaining, singly bridged edges. Hence, the system finds a compromise between the entropic drive to form an assembly smaller than the octahedron and the enthalpic prohibition of pairing two bulky ligands on the same edge of the triangular ring. The emission of luminescent LA is maintained in both homoleptic [Pd3LA6] and heteroleptic [Pd4LA4LB4].

Journal of the American Chemical Society published new progress about Crystal structure. 329214-79-1 belongs to class pyridine-derivatives, and the molecular formula is C11H16BNO2, Recommanded Product: 3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Kmentova, Iveta; Sutherland, Hamish S.; Palmer, Brian D.; Blaser, Adrian; Franzblau, Scott G.; Wan, Baojie; Wang, Yuehong; Ma, Zhenkun; Denny, William A.; Thompson, Andrew M. published the artcile< Synthesis and structure-activity relationships of aza- and diazabiphenyl analogues of the antitubercular drug (6S)-2-nitro-6-{[4-(trifluoromethoxy)benzyl]oxy}-6,7-dihydro-5H-imidazo[2,1-b][1,3]oxazine (PA-824)>, Related Products of 832735-54-3, the main research area is imidazooxazine aza diazabiphenyl analog preparation physicochem lipophilicity; microsomal stability pharmacokinetic property; tuberculosis antituberculosis structure activity; Suzuki Leibeskind Srogl cross coupling.

New heterocyclic analogs of the potent biphenyl class derived from antitubercular drug I were prepared, aiming to improve aqueous solubility but maintain high metabolic stability and efficacy. The strategy involved replacement of one or both Ph groups by pyridine, pyridazine, pyrazine, or pyrimidine, in order to reduce lipophilicity. For para-linked biaryls, hydrophilicities (ClogP) correlated with measured solubilities, but highly soluble bipyridine analogs displayed weak antitubercular activities. A terminal pyridine or proximal heterocycle allowed retention of potency and provided solubility improvements, particularly at low pH, with examples from the latter classes displaying the better in vivo efficacies, high metabolic stabilities, and excellent pharmacokinetics. Five such compounds were >100-fold better than the parent drug in a mouse model of acute Mycobacterium tuberculosis infection, and two orally bioavailable pyridine analogs (3-4-fold more soluble than the parent at low pH) were superior to antitubercular drug II in a chronic infection model.

Journal of Medicinal Chemistry published new progress about Aryl halides Role: RCT (Reactant), RACT (Reactant or Reagent). 832735-54-3 belongs to class pyridine-derivatives, and the molecular formula is C18H22BNO3, Related Products of 832735-54-3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Pyrch, Mikaela M.; Williams, Jay M.; Kasperski, Maguire W.; Applegate, Lindsey C.; Forbes, Tori Z. published the artcile< Synthesis and spectroscopic characterization of actinyl(VI) tetrahalide coordination compounds containing 2, 2'-bipyridine>, Computed Properties of 366-18-7, the main research area is uranium neptunium oxo chloro bromo complex preparation crystal structure.

Three new actinide tetrahalide coordination compounds containing 2,2′-bipyridinium (H2bpy) were synthesized by room temperature evaporation and characterized via single crystal x-ray diffraction, Raman spectroscopy, and IR spectroscopy. The solid-state compounds (Np1, U1, and U2) contain the AnO2+2 cation coordinated to four halide (chloride or bromide) atoms to form the anionic tetrahalide mol. unit [AnO2X4]2- (X = Cl, Br) and are charge balanced by the 2,2′-bipyridinium cations that engage in electrostatic interactions with the actinyl complex. Np1 (N2C10H10)[NpO2Cl4] contains 2,2′-bipyridine in the cis conformation where both the nitrogen atoms are directed towards the [NpO2Cl4]2- monomer. Within U1 (N2C10H9)[UO2Cl4], the 2,2′-bipyridine is in a trans conformation, and found in the same orientation in the isomorphous structure U2 (N2C10H9)[UO2Br4]. The compounds were further characterized by vibrational spectroscopy with specific interest in the actinyl cation. Raman spectroscopy provided information on the actinyl sym. stretch (ν1) whereas IR spectroscopy was used to determine the location of the asym. stretch (ν3). Spectral similarities are observed between the two isomorphous structures, but slight variations across structures are associated with bipyridine bands in the various conformations. Addnl. anal. of these vibrational features in U1 and U2 provided information on the actinyl force constants, allowing insight into the relative uranyl bond strength that was compared to similar tetrahalide compounds

Inorganica Chimica Acta published new progress about Actinide complexes Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Computed Properties of 366-18-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem