Pyridine-derivatives

Ngororabanga, Jean Marie Vianney’s team published research in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy in 2020 | CAS: 141-86-6

2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Application In Synthesis of 2,6-Diaminopyridine

《A novel multidentate pyridyl ligand: A turn-on fluorescent chemosensor for Hg2+ and its potential application in real sample analysis》 was written by Ngororabanga, Jean Marie Vianney; Moyo, Cyprian B.; Tshentu, Zenixole R.. Application In Synthesis of 2,6-Diaminopyridine And the article was included in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy in 2020. The article conveys some information:

A novel pyridyl-based ligand with multiple binding sites was developed as potential turn on fluorescent probe for mercuric ion. In comparison with other transition metal ions, the ligand displayed a significant optical selectivity and sensitivity for Hg2+ in aqueous solution with a remarkable fluorescence enhancement. The obtained spectroscopic response was related to the inhibition of the photo-chem. mechanism known as photo-induced electron transfer (PET) in the ligand and C=N isomerization by Hg2+ binding. A good linearity between fluorescence responses and Hg2+ concentration was obtained in the range 3.3 x 10-9 M-1.6 x 10-8 M and a nanomolar level limit of detection (LOD) (1.4 x 10-9 M ∼ 0.28 ppb) and limit of quantification (LOQ) (4.8 x 10-9 M ∼ 0.93 ppb) were obtained. Both LOD and LOQ values are very low compared to the reported permissible Hg2+ level in drinking water (2 ppb) by US Environmental Protection Agency (EPA). The possible binding mode between ligand and Hg2+ were determined using Job′s plot anal. and d. functional theory (DFT) calculations and a complex with 1:1 stoichiometric ratio was suggested. The response of the pyridyl ligand upon Hg2+ addition was noted to be fast without any time delay and reversible. The performance of the ligand at nanomolar level of Hg2+ and real sample application of the proposed method was investigated and satisfactory results were obtained. In the part of experimental materials, we found many familiar compounds, such as 2,6-Diaminopyridine(cas: 141-86-6Application In Synthesis of 2,6-Diaminopyridine)

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Youssef, Adel F.’s team published research in Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry in 1977 | CAS: 63585-69-3

2-Methyl-3-nitropyridine hydrochloride(cas: 63585-69-3) belongs to pyridine. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. As ligands, solvents, and catalysts they facilitate reactions; thus descriptions of these new ligands and their applications abound each year.Name: 2-Methyl-3-nitropyridine hydrochloride

The author of 《Synthesis and spectroscopic study of some 3-nitropyridines》 were Youssef, Adel F.; Farag, Hassan H.; Youssef, H.. And the article was published in Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry in 1977. Name: 2-Methyl-3-nitropyridine hydrochloride The author mentioned the following in the article:

6-Methyl-5-nitropyridine-2-carboxylic acid (I), and 3-(2-methyl-3-nitro-6-pyridyl)acrylic acid (II) were prepared The IR, mass and NMR spectra of 2,6-dimethyl-3-nitropyridine, 2-methyl-3-nitropyridine (III) and II were discussed. The structures of I and II were confirmed indirectly via conformation of the structure of their precursor III. II was a mixture of cis-(38%) and trans-(62%) isomers as revealed by its NMR. In the experiment, the researchers used 2-Methyl-3-nitropyridine hydrochloride(cas: 63585-69-3Name: 2-Methyl-3-nitropyridine hydrochloride)

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Evtushenko, Diana N.’s team published research in Acta Crystallographica, Section B: Structural Science, Crystal Engineering and Materials in 2020 | CAS: 98-98-6

Picolinic acid(cas: 98-98-6) is used in the preparation of 2-Aminodihydro[1,3]thiazines as BACE 2 inhibitors and their preparation and use in the treatment of diabetes.Category: pyridine-derivatives

《A cocrystal of L-ascorbic acid with picolinic acid: the role of O-H···O, N-H···O and C-H···O hydrogen bonds and L-ascorbic acid conformation in structure stabilization》 was written by Evtushenko, Diana N.; Arkhipov, Sergey G.; Fateev, Alexander V.; Izaak, Tatyana I.; Egorova, Lidia A.; Skorik, Nina A.; Vodyankina, Olga V.; Boldyreva, Elena V.. Category: pyridine-derivatives And the article was included in Acta Crystallographica, Section B: Structural Science, Crystal Engineering and Materials in 2020. The article conveys some information:

A new 1:1 cocrystal (L-Asc-Pic) of L-ascorbic acid (vitamin C) with picolinic acid was prepared as a powder and as single crystals. The crystal structure was solved and refined from single-crystal X-ray diffraction (SCXRD) data collected at 293 (2) and 100 (2) K. The samples of the L-Asc-Pic cocrystal were characterized by elemental (HCNS) anal. and titrimetric methods, TG/DTG/DSC, and IR and Raman spectroscopy. The asym. unit comprises a picolinic acid zwitterion and an L-ascorbic acid mol. The stabilization energy of intermol. interactions involving hydrogen bonds, the vibrational spectrum and the energies of the frontier MOs were calculated using the GAUSSIAN09 and the CrystalExplorer17 programs. The charge distribution on the atoms of the L-Asc-Pic cocrystal, L-ascorbic acid itself and its 12 known cocrystals (structures from Version 5.40 of the Cambridge Structural Database) were calculated by the methods of Mulliken, Voronoi and Hirshfeld charge analyses (ADF) at the bp86/TZ2P+ level of theory. The total effective charges and conformations of the L-ascorbic acid mols. in the new and previously reported cocrystals were compared with those of the two symmetry-independent mols. in the crystals of L-ascorbic acid. A correlation between mol. conformation and its effective charge is discussed. In the experiment, the researchers used many compounds, for example, Picolinic acid(cas: 98-98-6Category: pyridine-derivatives)

Picolinic acid(cas: 98-98-6) is used in the preparation of 2-Aminodihydro[1,3]thiazines as BACE 2 inhibitors and their preparation and use in the treatment of diabetes.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Ze’s team published research in Nature Structural & Molecular Biology in 2020-08-31 | 366-18-7

Nature Structural & Molecular Biology published new progress about 366-18-7. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Formula: C10H8N2.

Li, Ze; Li, Wenwei; Lu, Maolin; Bess, Julian Jr; Chao, Cara W.; Gorman, Jason; Terry, Daniel S.; Zhang, Baoshan; Zhou, Tongqing; Blanchard, Scott C.; Kwong, Peter D.; Lifson, Jeffrey D.; Mothes, Walther; Liu, Jun published the artcile< Subnanometer structures of HIV-1 envelope trimers on aldrithiol-2-inactivated virus particles>, Formula: C10H8N2, the main research area is .

Abstract: The HIV-1 envelope glycoprotein (Env) trimer, composed of gp120 and gp41 subunits, mediates viral entry into cells. Recombinant Env trimers have been studied structurally, but characterization of Env embedded in intact virus membranes has been limited to low resolution Here, we deploy cryo-electron tomog. and subtomogram averaging to determine the structures of Env trimers on aldrithiol-2 (AT-2)-inactivated virions in ligand-free, antibody-bound and CD4-bound forms at subnanometer resolution Tomog. reconstructions document mol. features consistent with high-resolution structures of engineered soluble and detergent-solubilized Env trimers. One of three conformational states previously predicted by smFRET was not observed by cryo-ET, potentially owing to AT-2 inactivation. We did observe Env trimers to open in situ in response to CD4 binding, with an outward movement of gp120-variable loops and an extension of a critical gp41 helix. Overall features of Env trimer embedded in AT-2-treated virions appear well-represented by current engineered trimers.

Nature Structural & Molecular Biology published new progress about 366-18-7. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Formula: C10H8N2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Parida, Amarchand’s team published research in Chemistry – An Asian Journal in 2019 | 2127-03-9

Chemistry – An Asian Journal published new progress about Coupling reaction. 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Formula: C10H8N2S2.

Parida, Amarchand; Choudhuri, Khokan; Mal, Prasenjit published the artcile< Unsymmetrical Disulfides Synthesis via Sulfenium Ion>, Formula: C10H8N2S2, the main research area is thiol iodine catalyst umpolung coupling reaction; disulfide preparation; diaryldisulfanes; sulfenium ion; synthetic methods; unsymmetrical disulfides; weak interactions.

An umpolung approach for the synthesis of unsym. disulfides via sulfenium ion was reported. In-situ generated electrophilic sulfenium ion from electron-rich thiols reacted with second thiols to yield unsym. disulfides. Using an iodine catalyst and 4-dimethylaminopyridine (DMAP)/water as promoter, the target synthesis were achieved in one-pot under aerobic condition.

Chemistry – An Asian Journal published new progress about Coupling reaction. 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Formula: C10H8N2S2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mohammad Arshad’s team published research in Russian Journal of Bioorganic Chemistry in 2020-07-31 | 350-03-8

Russian Journal of Bioorganic Chemistry published new progress about Antimicrobial agents. 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Category: pyridine-derivatives.

Mohammad Arshad published the artcile< Design, Drug-Likeness, Synthesis, Characterization, Antimicrobial Activity, Molecular Docking, and MTT Assessment of 1,3-Thiazolidin-4-one Bearing Piperonal and Pyrimidine Moieties>, Category: pyridine-derivatives, the main research area is thiazolidinone piperonal pyrimidine moiety antimicrobial activity mol docking.

The recent study reported the designing of substituted 3-[4-(1,3-benzodioxol-5-yl)-6-(pyridin-2-yl)pyrimidin-2-yl]-2-(pyridin-2-yl)-1,3-thiazolidin-4-one derivatives and assessed computationally to calculate the bioactivity and physicochem. properties. The substituted 3-[4-(1,3-benzodioxol-5-yl)-6-(pyridin-2-yl)pyrimidin-2-yl]-2-(pyridin-2-yl)-1,3-thiazolidin-4-one derivatives represented the bioactivity score in the zone for an active drug mol. and were in compliance with the Lipinski Rule of five. Then the synthesis, characterization, and biol. screening as antimicrobial potential and percent viability of cells were carried out for the substituted 3-[4-(1,3-benzodioxol-5-yl)-6-(pyridin-2-yl)pyrimidin-2-yl]-2-(pyridin-2-yl)-1,3-thiazolidin-4-one derivatives The zone of inhibition and min. inhibitory concentration (MIC) findings portrayed that the compounds-(IV) and compound-(V) possessed better antimicrobial activity than the reference drug ciprofloxacin, while the significant antimicrobial potential was observed by other members of the series. The mol. docking studies were performed to assist the in vitro antimicrobial results and the findings exhibited that significant H-bonding in between the substituted 3-[4-(1,3-benzodioxol-5-yl)-6-(pyridin-2-yl)pyrimidin-2-yl]-2-(pyridin-2-yl)-1,3-thiazolidin-4-one derivatives and the residues of GlcN-6-P-synthase, like ASP 474 (I-IX), SER 316 (I-VI), ASN 522 (I-IX), TRP 313 (V) with good binding affinity ranging -7.7 to -6.8 kcal/mol. The compounds represented the less toxic effects to the HepG2 cells and the percent viability of the cells ranging from 93-98%, 73-78% and 70-76% up to 3.125, 50, 100 mmol/L resp.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gaudino, Danila’s team published research in Journal of Rheology (Melville, NY, United States) in 2020-07-31 | 123-03-5

Journal of Rheology (Melville, NY, United States) published new progress about Polymers, linear. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Related Products of 123-03-5.

Gaudino, Danila; Costanzo, Salvatore; Ianniruberto, Giovanni; Grizzuti, Nino; Pasquino, Rossana published the artcile< Linear wormlike micelles behave similarly to entangled linear polymers in fast shear flows>, Related Products of 123-03-5, the main research area is linear wormlike micelle polymer shear flow.

We report shear startup data on solutions of entangled linear wormlike micelles, only differing in the concentration of a binding aromatic salt. Wormlike micelles behave similarly to ordinary polymers in fast shear flows, exhibiting pronounced overshoots as well as tiny undershoots in transient shear viscosity, before approaching the steady state. The analogy is here emphasized by successfully comparing data with predictions of a constitutive equation recently adopted for ordinary entangled polymers. In the fast shear flow, entangled linear wormlike micelles appear to align, stretch, and tumble just like polymeric chains.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

D’Andrade, Brian W’s team published research in Organic Electronics in 2005-02-28 | 370878-69-6

Organic Electronics published new progress about Cyclic voltammetry. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Recommanded Product: Ir(p-F-ppy)3.

D’Andrade, Brian W.; Datta, Shubhashish; Forrest, Stephen R.; Djurovich, Peter; Polikarpov, Eugene; Thompson, Mark E. published the artcile< Relationship between the ionization and oxidation potentials of molecular organic semiconductors>, Recommanded Product: Ir(p-F-ppy)3, the main research area is oxidation potential mol organic semiconductor HOMO.

A relation between the energy of the HOMO and the oxidation potential of mol. organic semiconductors is presented. Approximating mols. as dipoles consisting of a pos. charged ion core surrounded by an electron cloud, the HOMO energy (EHOMO) is calculated as that required to sep. these opposite charges in a neutral organic thin film. Also, an anal. of image charge forces on spherical mols. positioned near a conductive plane formed by the electrode in an electrochem. cell is shown to explain the observed linear relation between EHOMO and the oxidation potential. The EHOMO’s of a number of organic semiconductors commonly employed in thin film electronic devices were determined by UPS, and compared to the relative oxidation potential (VCV) measured using pulsed cyclic voltammetry, leading to the relation EHOMO = -(1.4 ± 0.1) × (qV CV) – (4.6 ± 0.08) eV, consistent with theor. predictions.

Organic Electronics published new progress about Cyclic voltammetry. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Recommanded Product: Ir(p-F-ppy)3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Chen, Hongtai’s team published research in Organic Letters in 2020-08-21 | 22961-45-1

Organic Letters published new progress about Acetamides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 22961-45-1 belongs to class pyridine-derivatives, and the molecular formula is C11H10N2, Computed Properties of 22961-45-1.

Chen, Hongtai; Yang, Yanyan; Wang, Lianxin; Niu, Yuxiang; Guo, Minjie; Ren, Xiangwei; Zhao, Wentao; Tang, Xiangyang; Wang, Guangwei published the artcile< Slicing and Splicing of Bromodifluoro-N-arylacetamides: Dearomatization and Difunctionalization of Pyridines>, Computed Properties of 22961-45-1, the main research area is copper catalyzed dearomatization functionalization pyridine bromodifluoroarylacetamide; fluoromethyl iminodihydropyridine synthesis.

Copper-catalyzed dearomatization and difunctionalization of pyridines have been disclosed, in which bromodifluoro-N-arylacetamide was sliced into five fragments and three or four of them were transferred to pyridine partners. Through this reaction, novel N-difluoromethyl-2-imine dihydropyridine derivatives can be conveniently accessed from com. available 4-amino substituted pyridines. This strategy demonstrates a novel fluorination method featuring high atom economy, environmental friendliness, an easily available catalyst, and simple operation.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Chao’s team published research in Advanced Synthesis & Catalysis in 2021-06-08 | 3731-53-1

Advanced Synthesis & Catalysis published new progress about Amines Role: RCT (Reactant), RACT (Reactant or Reagent). 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Quality Control of 3731-53-1.

Wang, Chao; Rui, Xiyan; Si, Dongjuan; Dai, Rupeng; Zhu, Yueyue; Wen, Hongmei; Li, Wei; Liu, Jian published the artcile< Copper-Catalyzed Three-Component Cascade Reaction of Benzaldehyde with Benzylamine and Hydroxylamine or Aniline: Synthesis of 1,2,4-Oxadiazoles and Quinazolines>, Quality Control of 3731-53-1, the main research area is aryl aldehyde aromatic amine copper catalyst tandem cyclization; biaryl oxadiazole preparation green chem; benzaldehyde benzylamine copper catalyst tandem cyclization green chem; diphenyl quinazoline preparation.

The analogous three-component synthesis strategy for substituted 1,2,4-oxadiazoles and quinazolines derivatives from readily available benzaldehydes, benzylamines and hydroxylamine or anilines was developed. Both the cascade reaction sequences involved nucleophilic addition of C-N bond, introduction a halogen donor, nucleophilic substitution and Cu(II)-catalyzed aerobic oxidation This synthesis methodol. demonstrated good yields, broad substrate scope and oxygen as a green oxidant. Thus, this synthesis protocol provided strategies for the construction of substituted 1,2,4-oxadiazole and quinazolines from readily and simple starting materials.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem