Pyridine-derivatives

Bhattacharya, Ritwick; Chatterjee, Arnab; Chatterjee, Soumendranath; Saha, Nimai Chandra published the artcile< Oxidative stress in benthic oligochaete worm, Tubifex tubifex induced by sublethal exposure to a cationic surfactant cetylpyridinium chloride and an anionic surfactant sodium dodecyl sulfate>, Reference of 123-03-5, the main research area is Tubifex cetylpyridinium chloride sodium dodecyl sulfate oxidative stress; Cetylpyridinium chloride; Integrated biomarker response; Oxidative stress; Sodium dodecyl sulfate.

The present study was assessed to determine the in vivo toxic effects of a cationic surfactant, cetylpyridinium chloride (CPC), and an anionic surfactant, sodium dodecyl sulfate (SDS) in terms of oxidative stress biomarkers in benthic oligochaete worm Tubifex tubifex for 14 days. The investigation demonstrated that sublethal concentrations of CPC (0.0213, and 0.0639 mg L-1) and SDS (1.094 and 3.092 mg L-1)induced paramount alterations in the oxidative stress enzymes in Tubifex tubifex. Superoxide dismutase (SOD), glutathione S-transferase (GST), reduced glutathione (GSH), and glutathione peroxidase (GPx) exhibited an initial notable increase in their activities in the surfactants exposed worms at 1d and 7d of exposure period followed by consequential reduction at 14d exposure period with respect to control, while catalase (CAT) and malondialdehyde (MDA) activities markedly incremented gradually throughout the exposure periods. Through the construction of the correlation matrix and integrated biomarker response (IBR), the effects of CPC and SDS on Tubifex tubifex were distinguished. These results indicate that exposure to these cationic and anionic surfactants modulates the levels of oxidative stress enzymes in Tubifex tubifex.

Comparative Biochemistry and Physiology, Part C: Toxicology & Pharmacology published new progress about Biomarkers. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Reference of 123-03-5.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Yuan, Qianjia; Sigman, Matthew S. published the artcile< Palladium-Catalyzed Enantioselective Relay Heck Arylation of Enelactams: Accessing α,β-Unsaturated δ-Lactams>, Related Products of 1416819-91-4, the main research area is oxidative relay Heck arylation arylboronic acid lactam; substituted lactam asym preparation.

In this Communication, the construction of chiral α,β-unsaturated δ-lactams, e.g. I, widely used as pharmacophores, in high yields and excellent enantioselectivities using an oxidative relay Heck arylation reaction is reported. This strategy also allows facile access to 7-substituted α,β-unsaturated ε-lactam products and δ-lactams containing a tetrasubstituted nitrogen-bearing stereocenter.

Journal of the American Chemical Society published new progress about Arylboronic acids Role: RCT (Reactant), RACT (Reactant or Reagent). 1416819-91-4 belongs to class pyridine-derivatives, and the molecular formula is C13H15F3N2O, Related Products of 1416819-91-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Deady, Leslie W.; Korytsky, Olga L.; Rowe, Jeffrey E. published the artcile< Substituent effects on the isomer ratios in the rearrangement of some 2- and 4-nitraminopyridines>, Category: pyridine-derivatives, the main research area is substituent effect rearrangement nitraminopyridine.

The preparation and rearrangement in 92% H2SO4 of I-III (R = H, Me, MeO, Br, Cl, CO2H) were investigated. The product isomer ratios can be explained by differential electronic stabilization of the appropriate σ complexes for aromatic nitration and steric effects seem relatively unimportant. Deuteration [3-D in I, R = Me] had no effect on the product distribution.

Australian Journal of Chemistry published new progress about Rearrangement. 22280-62-2 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Pegu, David published the artcile< Analysis of molecular structure, vibrational spectra and electronic properties of 2-amino-3-nitro-6-picoline by density functional methods>, Recommanded Product: 2-Amino-3-nitro-6-picoline, the main research area is amino nitropicoline mol structure vibrational spectrum electronic property.

In the present study the geometrical parameters and vibrational spectroscopic properties of the compound 2-amino-3-nitro-6-picoline (2A3N6P) have been calculated by using Harteree-Fock and D. functional method (B3LYP) with 6-311++G(d,p) basis set. The calculated optimized structural parameters and the scaled frequencies are investigated and compared with earlier reported data. The complete vibrational assignment and anal. of the fundamental modes of the mol. were carried out. In addition, mol. electrostatic potential and total electron d. has been analyzed to investigate size, shape, charge d. distribution and site on chem. reactivity of the mol. Finally the Mullikan at. charges of the compound have been studied.

Pharma Chemica published new progress about Atomic charge. 21901-29-1 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Recommanded Product: 2-Amino-3-nitro-6-picoline.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ehrhardt, Alexandre; Mandelli, Jessica Zolim Andreatto; Bergamo, Vanessa; Lopes, William; Donato, Ricardo Keitel; Zanette, Regis A.; Fuentefria, Alexandre Meneghello published the artcile< Glass ionomer cement modified by a imidazolium salt: adding antifungal properties to a biomaterial>, Reference of 123-03-5, the main research area is glass ionomer cement imidazolium antifungal property; Antibiofilm activity; Candida spp; Dental material.

We present the structural modification of a com. available glass ionomer cement by inserting the imidazolium salt 1-n-hexadecyl-3-methylimidazolium chloride (C16MImCl), composing a new biomaterial with antifungal biofilm activity. Test specimens were prepared using a com. glass ionomer cement to which 10 ppm of cetylpyridinium chloride (reference ionic antifungal agent) or C16MImCl were added. The feasibility and hypoallergenicity of the new biomaterial were assessed by microhardness plastic deformation and chorioallantoic membrane assays. Colony counting and SEM were used to evaluate the modified specimens’ antibiofilm activity against three multidrug-resistant Candida species. The modified glass ionomer cement presented a strong antibiofilm activity against Candida spp., without losing its original micromech. and hypoallergenic properties, rendering it a promising candidate for further application in dentistry.

Brazilian Journal of Microbiology published new progress about Antibiofilm agents. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Reference of 123-03-5.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ganguli, Kasturi; Shee, Sujan; Panja, Dibyajyoti; Kundu, Sabuj published the artcile< Cooperative Mn(I)-complex catalyzed transfer hydrogenation of ketones and imines>, Application In Synthesis of 350-03-8, the main research area is alc preparation chemoselective; ketone transfer hydrogenation manganese catalyst; aryl aldehyde transfer hydrogenation manganese catalyst; imine transfer hydrogenation manganese catalyst.

The synthesis and reactivity of Mn(I) complexes bearing bifunctional ligands comprising both the amine N-H and benzimidazole fragments I and II (R = H, Me; R1 = H, Me, phenyl; R2 = H, Me) are reported. Among the various ligands, the N-((1H-benzimidazol-2-yl)methyl)aniline ligand containing Mn(I) complex II (R = R2 = H; R1 = Ph) presented higher reactivity in the transfer hydrogenation (TH) of ketones R3C(O)R4 (R3 = Ph, thiophen-2-yl, cyclopropyl, etc.; R4 = Me, propan-2-yl, tert-Bu, etc.; R3R4 = 9H-fluoren-9-yl, 1,2,3,4-tetrahydronaphthalen-1-yl, cyclohexyl) in 2-propanol. Exptl., it was established that both the benzimidazole and amine N-H proton played a vital role in the enhancement of the catalytic activity. Utilizing this system, a wide range of ketones R3C(O)R4 and aldehydes R5CHO (R5 = 4-CH3C6H4, thiophen-2-yl, pentyl, etc.) was reduced efficiently. Notably, the TH of several imines R6R7C=NR8 (R6 = 4-OCH3C6H4, thiophen-2-yl, naphthalen-2-yl, etc.; R7 = H, Me, Et; R8 = C6H5, 4-OCH3C6H4, CH3(CH2)3, etc.), as well as chemoselective reduction of unsaturated ketones, was achieved in the presence of this catalyst. DFT calculations were carried out to understand the plausible reaction mechanism which disclosed that the transfer hydrogenation reaction followed a concerted outer-sphere mechanism.

Dalton Transactions published new progress about Alcohols Role: SPN (Synthetic Preparation), PREP (Preparation). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Application In Synthesis of 350-03-8.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Holder, Samuel W.; Grant, Samuel C.; Mohammadigoushki, Hadi published the artcile< Nuclear Magnetic Resonance Diffusometry of Linear and Branched Wormlike Micelles>, SDS of cas: 123-03-5, the main research area is NMR diffusometry linear branched wormlike micelle.

Diffusion studies using NMR spectroscopy were conducted on two model surfactant solutions of cetyltrimethylammonium bromide/sodium salicylate (CTAB/NaSal) and cetylpyridinium chloride/sodium salicylate (CPCl/NaSal). By increasing the salt-to-surfactant concentration ratio, these systems display two peaks in the zero-shear viscosity and relaxation time, which are indicative of transitions from linear to branched micellar networks. The goal of this work is to assess the sensitivity of NMR diffusometry to different types of micellar microstructures and identify the mechanism(s) of surfactant self-diffusion in micellar solutions At low salt-to-surfactant concentration ratios, for which wormlike micelles are linear, the surfactant self-diffusion is best described by a mean squared displacement, Z2, that varies as Z2 ∝ Tdiff0.5, where Tdiff is the diffusion time. As the salt concentration increases to establish branched micelles, Z2 ∝ Tdiff, indicating a Brownian-like self-diffusion of surfactant mols. in branched micelles. This result indicates that NMR diffusometry is capable of differentiating various types of micellar microstructures. In addition, the self-diffusion coefficient of the surfactant mols. in linear and branched micelles are determined, for the first time, by comparing the existing restricted diffusion models and are shown to be much slower than the diffusion of proton mols. in the bulk. Moreover, in linear and moderately branched wormlike micelles, the dominant mechanism of surfactant self-diffusion is through the curvilinear diffusion of the surfactant mols. along the contour length of the micelles, whereas in the branched micelles, before the second viscosity maxima, the surfactant self-diffusion could arise from a combination of micellar breakage, exchange between micelles and/or the bulk.

Langmuir published new progress about Diffusion. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, SDS of cas: 123-03-5.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Karges, Johannes; Jakubaszek, Marta; Mari, Cristina; Zarschler, Kristof; Goud, Bruno; Stephan, Holger; Gasser, Gilles published the artcile< Synthesis and Characterization of an Epidermal Growth Factor Receptor-Selective RuII Polypyridyl-Nanobody Conjugate as a Photosensitizer for Photodynamic Therapy>, Synthetic Route of 366-18-7, the main research area is EGFR RuII polypyridyl nanobody conjugate photosensitizer photodynamic therapy; bioinorganic chemistry; medicinal inorganic chemistry; metal-based drugs; metals in medicine; photodynamic therapy.

There is a current surge of interest in the development of novel photosensitizers (PSs) for photodynamic therapy (PDT), as those currently approved are not completely ideal. Among the tested compounds, we have previously investigated the use of RuII polypyridyl complexes with a [Ru(bipy)2(dppz)]2+ and [Ru(phen)2(dppz)]2+ scaffold (bipy=2,2′-bipyridine; dppz=dipyrido[3,2-a:2′,3′-c]phenazine; phen=1,10-phenanthroline). These complexes selectively target DNA. However, because DNA is ubiquitous, it would be of great interest to increase the selectivity of our PDT PSs by linking them to a targeting vector in view of targeted PDT. Herein, we present the synthesis, characterization, and in-depth photophys. evaluation of a nanobody-containing RuII polypyridyl conjugate selective for the epidermal growth factor receptor (EGFR) in view of targeted PDT. Using ICP-MS and confocal microscopy, we could demonstrate that our conjugate has high selectivity for the EGFR receptor, which is a crucial oncol. target because it is overexpressed and/or deregulated in a variety of solid tumors. However, in contrast to expectations, this conjugate was found to not produce reactive oxygen species (ROS) in cancer cells and is therefore not phototoxic.

ChemBioChem published new progress about Cytotoxicity. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Synthetic Route of 366-18-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem