Category: pyridine-derivatives

Talik, Tadeusz; Talik, Zofia published the artcile< 2-Fluoronitro-derivatives of pyridine and picolines>, HPLC of Formula: 21901-29-1, the main research area is pyridine fluoro nitro; picoline fluoro nitro; diazotization aminopyridine.

6-Fluoro derivatives from 4-nitro- and 3,5- and 3,4-dinitropyridine, 3- and 5-nitro- and 3,5-dinitro-4-picoline, 3- and 5-nitro- and 3,5-dinitro-2-picoline, and 5-nitro-3-picoline as well as 2-fluoro-5-nitro-3-picoline were prepared in 52.5-85% yields by diazotization of the corresponding amino derivatives in 65% HF.

Roczniki Chemii published new progress about 21901-29-1. 21901-29-1 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, HPLC of Formula: 21901-29-1.

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

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

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

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

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

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

Jiang, Xiaoli; Han, Bo; Xue, Yuhang; Duan, Mei; Gui, Zhuofan; Wang, You; Zhu, Shaolin published the artcile< Nickel-catalysed migratory hydroalkynylation and enantioselective hydroalkynylation of olefins with bromoalkynes>, Category: pyridine-derivatives, the main research area is benzylic alkyne preparation regioselective chemoselective; alkene bromoalkyne migratory hydroalkynation nickel catalyst; chiral benzylic alkyne preparation chemoselective enantioselective; styrene bromoalkyne hydroalkynation nickel catalyst.

Here, an NiH-catalyzed reductive migratory hydroalkynation of olefins such as, 4-phenyl-1-butene, (E)-1,2-diphenylethene, 1H-indene, etc. with bromoalkynes RCCBr [R = tris(propan-2-yl)silyl, triphenylmethyl, tert-butyldiphenylsilyl] that delivers the corresponding benzylic alkynation products ArCH(CH2R1)CCR [Ar = Ph, naphthalen-2-yl, thiophen-3-yl, etc.; R1 = H, Et, 2-cyclohexylethyl, Ph, etc.] in high yields with excellent regioselectivities was reported. Catalytic enantioselective hydroalkynation of styrenes (E/Z)-Ar1CH=CHR2 [Ar1 = Ph, 2-methoxyphenyl, thiophen-3-yl, etc.; R2 = H, Me, Et, Ph, etc.] has also been realized using a simple chiral PyrOx ligand. The obtained enantioenriched benzylic alkynes (S)-Ar1CH(CH2R2)CCR [R = tris(propan-2-yl)silyl, triethylsilyl, tert-butyldimethylsilyl, etc.] are versatile synthetic intermediates and can be readily transformed into synthetically useful chiral synthons.

Nature Communications published new progress about Alkenes Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 1416819-91-4 belongs to class pyridine-derivatives, and the molecular formula is C13H15F3N2O, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Jalba, Angela; Regnier, Noemie; Ollevier, Thierry published the artcile< Enantioselective Aromatic Sulfide Oxidation and Tandem Kinetic Resolution Using Aqueous H2O2 and Chiral Iron-Bis(oxazolinyl)bipyridine Catalysts>, Application In Synthesis of 147409-41-4, the main research area is aromatic sulfoxide sulfone enantioselective preparation; arylsulfide enantioselective oxidation iron chiral ligand catalyst.

An efficient method for the oxidation of aromatic sulfides has been developed by using aqueous H2O2, catalyzed by the in situ generated chiral Fe/6,6′-bis(4-isopropyloxazolin-2-yl)-2,2′-bipyridine (bipybox-iPr) complex. The corresponding sulfoxides were obtained with high enantioselectivities (up to 98.5:1.5 er) and in good yields (up to 61 %) when the mono-oxidation of the sulfides was performed in combination with the kinetic resolution of the sulfoxide into the sulfone.

European Journal of Organic Chemistry published new progress about Amino alcohols, chiral Role: RCT (Reactant), RACT (Reactant or Reagent). 147409-41-4 belongs to class pyridine-derivatives, and the molecular formula is C22H26N4O2, Application In Synthesis of 147409-41-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem