Category: pyridine-derivatives

Husain, Sajid; Krishnamurthy, A. S. R.; Sarma, P. Nageswara published the artcile< Separation and identification of chloropyridine isomers and quantitative determination of pentachloropyridine in chlorinated pyridine residues by gas chromatography-mass spectrometry>, Formula: C5HCl4N, the main research area is chloropyridine gas chromatog mass spectrometry.

Chloropyridine isomers (2,3,5-trichloropyridine 2,4,6-trichloropyridine, 2,3,4,6-tetrachloropyridine. 2,3,5,6-Tetrachloropyridine, and pentachloropyridine) were separated and identified by gas chromatog.-mass spectrometry in chlorinated pyridine residue. Stainless steel columns packed with 3% or 10% DEGA on Chromosorb WAW or PAW were used. Chloropyridine are intermediates in the preparation of pesticides, herbicides, dyes, pharmaceuticals, and plastics.

Journal of Chromatography published new progress about 14121-36-9. 14121-36-9 belongs to class pyridine-derivatives, and the molecular formula is C5HCl4N, Formula: C5HCl4N.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bahmani, Pegah; Maleki, Afshin; Rezaee, Reza; Mahvi, Amir Hossein; Khamforoush, Mehrdad; Dehestani Athar, Saeed; Daraei, Hiua; Gharibi, Fardin; McKay, Gordon published the artcile< Arsenate removal from aqueous solutions using micellar-enhanced ultrafiltration>, Quality Control of 123-03-5, the main research area is arsenate wastewater treatment micellar enhanced ultrafiltration; Arsenate removal; Micelle optimization; Polyacrylonitrile membrane; Surfactant enhancement; Ultrafiltration.

In this study, arsenate (As-V) removal using micellar enhanced ultrafiltration (MEUF) modified by cationic surfactants was studied by a dead-end polyacrylonitrile (PAN) membrane apparatus The UF membrane has been produced by a phase inversion process. The prepared membrane was characterized and analyzed for morphol. and membrane properties. The influence of operating parameters such as initial concentrations of As-V, surfactants, pH, membrane thickness, and co-existing anions on the removal of As-V, surfactant rejection, and permeate flux have been studied. The exptl. results show that from the two different cationic surfactants used the CPC (cetyl-pyridinium chloride) efficiency (91.7%) was higher than that of HTAB (hexadecyltrimethyl-ammonium bromide) (83.7%). The highest As-V removal was 100%, and was achieved using initial feed concentrations of 100-1000μg/L, at pH 7 with a membrane thickness of 150μm in a dead-end filtration system. This efficiency for As-V removal was similar to that obtained using a cross-flow system. Nevertheless, this flux reduction was less than the reduction achieved in the dead-end filtration process. The PAN fabricated membrane in comparison to the RO and NF processes selectively removed the arsenic and the anions, in the water taken from the well, and had no substantial effect on the cations.

Journal of Environmental Health Science and Engineering published new progress about Cationic surfactants. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Quality Control of 123-03-5.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Arora, Santosh; Talwar, Dinesh; Singh, Manjeet; Sahoo, Subash C.; Sharma, Rohit published the artcile< Second sphere coordination in orthonitrophenolate binding: Synthesis, biological, cytotoxic and X-ray structural studies of [Co(bpy)2CO3](C6H4NO3)·3H2O>, Computed Properties of 366-18-7, the main research area is crystal structure cobalt bipyridine carbonato orthonitrophenolate; cobalt bipyridine carbonato nitrophenolate preparation cytotoxic antimicrobial activity.

A new Co (III) complex salt [Co(bpy)2CO3](ONP)·3H2O (1) where ONP = orthonitrophenolate/C6H4NO3 was synthesized to explore [Co(bpy)2CO3]+ cation as a new host for orthonitrophenolate anion. The newly synthesized complex salt was then characterized by elemental anal., spectroscopic techniques (UV-Visible, FTIR, 1H NMR) and solubility product measurement. Single crystal x-ray structure studies of 1 revealed one 2-nitrophenolate anion, one [Co(bpy)2CO3]+cation and three H2O mols. of crystallization in the solid state. The structural studies revealed that a strong network of H bonding interactions O-H···O (water/phenolate), O-H···O (water/H2O), O-H···O (water/carbonate) stabilize the crystal lattice. Newly synthesized complex 1 was scrutinized for antimicrobial activity and the results revealing a modest activity. The synthesized compound was screened for anticancer activity against PANC-1 cells using MTT colorimetric assay.

Journal of Molecular Structure published new progress about Antibacterial agents. 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

Mei, Tian-Sheng; Werner, Erik W.; Burckle, Alexander J.; Sigman, Matthew S. published the artcile< Enantioselective Redox-Relay Oxidative Heck Arylations of Acyclic Alkenyl Alcohols using Boronic Acids>, SDS of cas: 1416819-91-4, the main research area is acyclic alkenol arylboronic acid enantioselective regioselective oxidative Heck arylation; aryl aldehyde stereoselective preparation; ketone aryl stereoselective preparation.

A general, highly selective asym. redox-relay oxidative Heck reaction using achiral or racemic acyclic alkenols and boronic acid derivatives is reported. This reaction delivers remotely functionalized arylated carbonyl products from acyclic alkenol substrates, with excellent enantioselectivity under mild conditions, bearing a range of useful functionality. A preliminary mechanistic investigation suggests that the regioselectivity of the initial migratory insertion is highly dependent on the electronic nature of the boronic acid and more subtle electronic effects of the alkenyl alc.

Journal of the American Chemical Society published new progress about Aldehydes Role: SPN (Synthetic Preparation), PREP (Preparation) (aralkyl). 1416819-91-4 belongs to class pyridine-derivatives, and the molecular formula is C13H15F3N2O, SDS of cas: 1416819-91-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Moon, Yonghoon; Lee, Wooseok; Hong, Sungwoo published the artcile< Visible-Light-Enabled Ortho-Selective Aminopyridylation of Alkenes with N-Aminopyridinium Ylides>, Electric Literature of 93-60-7, the main research area is blue LED ortho selective aminopyridylation alkene aminopyridinium ylide.

By utilizing an underexplored reactivity mode of N-aminopyridinium ylides, we developed the visible-light-induced ortho-selective aminopyridylation of alkenes via radical-mediated 1,3-dipolar cycloaddition The photocatalyzed single-electron oxidation of N-aminopyridinium ylides generates the corresponding radical cations that enable previously inaccessible 1,3-cycloaddition with a broader range of alkene substrates. The resulting cycloaddition adducts rapidly undergo subsequent homolytic cleavage of the N-N bond, conferring a substantial thermodn. driving force to yield various β-aminoethylpyridines. Remarkably, amino and pyridyl groups can be installed into both activated and unactivated alkenes with modular control of ortho-selectivity and 1,2-syn-diastereoselectivity under metal-free and mild conditions. Combined exptl. and computational studies are conducted to clarify the detailed reaction mechanism and the origins of site selectivity and diastereoselectivity.

Journal of the American Chemical Society published new progress about 1,3-Dipolar cycloaddition catalysts. 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Electric Literature of 93-60-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Akhlaghpasand, Mohammadhosein; Tizro, Mahdi; Raoofi, Amir; Meymand, Arman Zeinaddini; Farhadieh, Mohammaderfan; Khodagholi, Fariba; Khatmi, Aysan; Soltani, Reza; Hoseini, Yadolah; Jahanian, Ali; Boroujeni, Mahdi Eskandarian; Aliaghaei, Abbas published the artcile< Grafted human chorionic stem cells restore motor function and preclude cerebellar neurodegeneration in rat model of cerebellar ataxia>, Reference of 350-03-8, the main research area is cerebellar ataxia chorionic stem cell neurodegeneration; 3-acetylpyridine; Cerebellar ataxia; Chorionic stem cells; Neurodegeneration; Transplantation.

Abstract: Cerebellar ataxia (CA) is a form of ataxia that adversely affects the cerebellum. Cell replacement therapy (CRT) has been considered as a potential treatment for neurol. disorders. In this report, we investigated the neuro-restorative effects of human chorionic stem cells (HCSCs) transplantation on rat model of CA induced by 3-acetylpyridine (3-AP). In this regard, HCSCs were isolated and phenotypically determined Next, a single injection of 3-AP was administered for ataxia induction, and bilateral HCSCs implantation was conducted 3 days after 3-AP injection, followed by expression anal. of a number of apoptotic, autophagic and inflammatory genes as well as vascular endothelial growth factor (VEGF) level, along with assessment of cerebellar neurodegeneration, motor coordination and muscle activity. The findings revealed that grafting of HCSCs in 3-AP model of ataxia decreased the expression levels of several inflammatory, autophagic and apoptotic genes and provoked the up-regulation of VEGF in the cerebellar region, prevented the degeneration of Purkinje cells caused by 3-AP toxicity and ameliorated motor coordination and muscle function. In conclusion, these data indicate in vivo efficacy of HCSCs in the reestablishment of motor skills and reversal of CA.

Metabolic Brain Disease published new progress about Antigens, Thy-1 Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Reference of 350-03-8.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Karges, Johannes; Kalaj, Mark; Gembicky, Milan; Cohen, Seth M. published the artcile< ReI tricarbonyl complexes as coordinate covalent inhibitors for the SARS-CoV-2 main cysteine protease>, Product Details of C10H6Cl2N2, the main research area is rhenium tricarbonyl complex coordinate inhibitor main protease SARS CoV2; synthesis crystal structure rhenium tricarbonyl complex protease inhibitor 3CLpro; SARS-CoV-2; antiviral agents; bioinorganic chemistry; medicinal inorganic chemistry; protease inhibitor.

Since its outbreak, the severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2) has impacted the quality of life and cost hundreds-of-thousands of lives worldwide. Based on its global spread and mortality, there is an urgent need for novel treatments which can combat this disease. To date, the 3-chymotrypsin-like protease (3CLpro), which is also known as the main protease, is considered among the most important pharmacol. targets. The vast majority of investigated 3CLpro inhibitors are organic, non-covalent binders. Herein, the use of inorganic, coordinate covalent binders is proposed that can attenuate the activity of the protease. ReI tricarbonyl complexes were identified that demonstrate coordinate covalent enzymic inhibition of 3CLpro. Preliminary studies indicate the selective inhibition of 3CLpro over several human proteases. This study presents the first example of metal complexes as inhibitors for the 3CLpro cysteine protease.

Angewandte Chemie, International Edition published new progress about Anticoronaviral agents. 1762-41-0 belongs to class pyridine-derivatives, and the molecular formula is C10H6Cl2N2, Product Details of C10H6Cl2N2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hebel, David; Rozen, Shlomo published the artcile< Utilizing acetyl hypofluorite for chlorination, bromination, and etherification of the pyridine system>, HPLC of Formula: 13472-84-9, the main research area is pyridine chlorination acetyl hypofluorite; etherification pyridine acetyl hypofluorite; bromination pyridine acetyl hypofluorite.

AcOF, which is easily made from F2, possesses a strong electrophilic fluorine. This electrophile is able to attach itself to the nitrogen atom of pyridine and activate the ring toward nucleophilic attacks. The ultimate elimination of HF results in an overall easy nucleophilic displacement of the hydrogen of the important 2-position. The nucleophiles used, originate from solvents such as CH2Cl2, CH2Br2, and various primary alcs. Thus, 2-halo- or 2-alkoxypyridines are formed. The reaction conditions (room temperature, very short reaction times, and good yields) transform the task of direct substitution of the pyridine ring from an extremely difficult to a very easy procedure.

Journal of Organic Chemistry published new progress about Bromination. 13472-84-9 belongs to class pyridine-derivatives, and the molecular formula is C6H6ClNO, HPLC of Formula: 13472-84-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Dong, Yuman; Liu, Peng published the artcile< Amphiphilic Triblock Copolymer Prodrug for Tumor-Specific pH/Reduction Dual-Triggered Drug Delivery: Effect of Self-Assembly Behaviors>, SDS of cas: 2127-03-9, the main research area is amphiphilic triblock copolymer prodrug tumor treatment drug delivery system.

Diblock copolymer-based prodrugs have been widely designed for tumor treatment after self-assembly; however, premature drug leakage could not be ignored because their hydrophobic prodrug cores were directly exposed to the media. Here, an amphiphilic triblock copolymer prodrug with a hydrophilic PEG block, a pH-sensitive poly(2-(diisopropylamino)ethyl methacrylate) (PDPA) block, and a hydrophobic reduction-cleavable prodrug block was synthesized for tumor-specific pH/reduction dual-triggered drug delivery, via the successive RAFT polymerization of DPA and a DOX-based monomer (MAL-DOX) with a PEG-based macro-CTA. The core-shell and core-shell-corona nanoparticles could be obtained by one-step and two-step self-assembly. With the pH-sensitive gatekeeper formed by the PDPA block, the core-shell-corona nanoparticles possessed a smaller diameter with narrow distribution and better drug release with lower drug leakage. MTT assays demonstrated the selective cytotoxicity of the core-shell-corona nanoparticles to the cancer cells was dose-dependent because of the reduction-cleavable prodrug. The negligible drug leakage and selective cytotoxicity to cancer cells endow the proposed core-shell-corona prodrug nanoparticles with promising potential for tumor treatment without toxic side effects on the normal cells.

Langmuir published new progress about Antitumor agents. 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, SDS of cas: 2127-03-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Yang, Lichen; Uemura, Nao; Nakao, Yoshiaki published the artcile< meta-Selective C-H Borylation of Benzamides and Pyridines by an Iridium-Lewis Acid Bifunctional Catalyst>, Category: pyridine-derivatives, the main research area is meta selective borylation benzamide pyridine iridium aluminum bifunctional catalyst; borane pyridyl benzamide derivative preparation.

The authors report herein the Ir-catalyzed meta-selective C-H borylation of benzamides by using a newly designed 2,2′-bipyridine (bpy) ligand bearing an alkylaluminum biphenoxide moiety. The authors also demonstrate the Ir-catalyzed C3-selective C-H borylation of pyridine with a 1,10-phenanthroline (Phen) ligand bearing an alkylborane moiety. Probably the Lewis acid-base interaction between the Lewis acid moiety and the aminocarbonyl group or the sp2-hybridized N atom accelerates the reaction and controls the site-selectivity.

Journal of the American Chemical Society published new progress about Benzamides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 329214-79-1 belongs to class pyridine-derivatives, and the molecular formula is C11H16BNO2, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem