Category: pyridine-derivatives

Feller, Moran published the artcileCO₂ activation by metal-ligand-cooperation mediated by iridium pincer complexes, Formula: C23H43NP2, the publication is Journal of Coordination Chemistry (2018), 71(11-13), 1679-1689, database is CAplus.

Herein we report the reversible activation of CO₂ by the dearomatized complex [(^tBuPNP*)Ir(COE)] and by the aromatized complex [(^tBuPNP)Ir(C₆H₅)] via metal-ligand cooperation (MLC) (^tBuPN = 2,6-bis-(di-tert-butylphosphinomethyl)pyridine; ^tBuPNP* = deprotonated PNP; COE = cyclooctadiene). The [1,3]-addition of CO₂ to both complexes is reversible at ambient temperature While the dearomatized complex reacts readily at ambient temperature with CO₂ in THF or benzene, the aromatized complex reacts with CO₂ upon heating in benzene at 80 °C or at ambient temperature in THF. The novel aromatized complex [(^tBuPNP)IrCl] does not react with CO₂. Based on the reactivity patterns of these complexes with CO₂, we suggest that CO₂ activation via MLC takes place only via the dearomatized species, and that in the case of [(^tBuPNP)Ir(C₆H₅)], THF plays a role as a polar solvent in facilitating formation of the dearomatized hydrido Ph complex intermediate.

Journal of Coordination Chemistry published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Formula: C23H43NP2.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Prechtl, Martin H. G. published the artcileSynthesis and characterisation of nonclassical ruthenium hydride complexes containing chelating bidentate and tridentate phosphine ligands, Product Details of C23H43NP2, the publication is Chemistry – A European Journal (2007), 13(5), 1539-1546, database is CAplus and MEDLINE.

The synthesis and characterization of nonclassical Ru hydride complexes containing bidentate diphosphine and tridentate PCP (1,3-bis(di-tert-butylphosphinomethyl)benzene) and PNP (1,6-bis(di-tert-butylphosphinomethyl)pyridine) pincer-type ligands are described. The mononuclear and dinuclear Ru complexes presented were synthesized in moderate to high yields by the direct hydrogenation route (1-pot synthesis) or in a two-step procedure. In both cases [Ru(cod)(metallyl)₂] served as a readily available precursor. The influences of the coordination geometry and the ligand framework on the structure, binding, and chem. properties of the M-H₂ fragments were studied by x-ray crystal structure anal., spectroscopic methods, and reactivity towards N₂, D₂, and deuterated solvents.

Chemistry – A European Journal published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Product Details of C23H43NP2.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Rayder, Thomas M. published the artcileEngineering Second Sphere Interactions in a Host-Guest Multicomponent Catalyst System for the Hydrogenation of Carbon Dioxide to Methanol, Product Details of C23H43NP2, the publication is Journal of the American Chemical Society (2021), 143(3), 1630-1640, database is CAplus and MEDLINE.

Many enzymes utilize interactions extending beyond the primary coordination sphere to enhance catalyst activity and/or selectivity. Such interactions could improve the efficacy of synthetic catalyst systems, but the supramol. assemblies employed by biol. to incorporate second sphere interactions are challenging to replicate in synthetic catalysts. Herein, a strategy is reported for efficiently manipulating outer-sphere influence on catalyst reactivity by modulating host-guest interactions between a noncovalently encapsulated transition-metal-based catalyst guest and a metal-organic framework (MOF) host. This composite consists of a ruthenium PNP pincer complex encapsulated in the MOF UiO-66 that is used in tandem with the zirconium oxide nodes of UiO-66 and a ruthenium PNN pincer complex to hydrogenate carbon dioxide to methanol. Due to the method used to incorporate the complexes in UiO-66, structure-activity relationships could be efficiently determined using a variety of functionalized UiO-66-X hosts. These investigations uncovered the beneficial effects of the ammonium functional group (i.e., UiO-66-NH₃⁺). Mechanistic experiments revealed that the ammonium functionality improved efficiency in the hydrogenation of carbon dioxide to formic acid, the first step in the cascade. Isotope effects and structure-activity relationships suggested that the primary role of the ammonium functionality is to serve as a general Bronsted acid. Importantly, the cooperative influence from the host was effective only with the functional group in close proximity to the encapsulated catalyst. Reactions carried out in the presence of mol. sieves to remove water highlighted the beneficial effects of the ammonium functional group in UiO-66-NH₃⁺ and resulted in a 4-fold increase in activity. As a result of the modular nature of the catalyst system, the highest reported turnover number (TON) (19 000) and turnover frequency (TOF) (9100 h^-1) for the hydrogenation of carbon dioxide to methanol are obtained. Moreover, the reaction was readily recyclable, leading to a cumulative TON of 100 000 after 10 reaction cycles.

Journal of the American Chemical Society published new progress about 338800-13-8. 338800-13-8 belongs to pyridine-derivatives, auxiliary class Bis-phosphine Ligands, name is 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, and the molecular formula is C23H43NP2, Product Details of C23H43NP2.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Wood, Aaron published the artcileCoordinated Hydrazone Ligands as Nucleophiles: Reactions of Fe(papy)₂, Recommanded Product: 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, the publication is Inorganic Chemistry (2004), 43(26), 8355-8360, database is CAplus and MEDLINE.

The diamagnetic Fe(II) complexes of the hydrazone ligand pyridinecarboxaldehyde-2′-pyridylhydrazone (papyH) were characterized by NMR, IR, UV-visible, and electrochem. The dication Fe(papyH)₂²⁺ undergoes reversible 1-electron oxidation at 0.66 V vs. internal ferrocene and shows a strong metal-ligand charge-transfer band in the visible region at 524 nm. Deprotonation with NaOH gives diamagnetic, neutral Fe(papy)₂ with an oxidation potential of -0.25 V vs. internal ferrocene and a charge-transfer band at 603 nm. Fe(papy)₂ reacts with active alkylating agents to give dialkyl complexes Fe(papyR)₂²⁺ with spectroscopic properties similar to those of Fe(papyH)₂²⁺. Monitoring the alkylation by UV-visible reveals the intermediacy of a monoalkylated species.

Inorganic Chemistry published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C10H14O, Recommanded Product: 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Carmona-Vargas, Christian C. published the artcileDetermination of the binding constants of propeller-like metal complexes of picolinaldehyde-2-pyridylhydrazone, Name: 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, the publication is Inorganica Chimica Acta (2019), 275-280, database is CAplus.

Herein, the authors determined the binding constants for transition metal complexes of Cu²⁺, Co²⁺, Fe²⁺, Ni²⁺, and Zn²⁺ ions formed with the ligand picolinaldehyde-2-pyridylhydrazone (PapyH) using the Benesi-Hildebrand method. Stoichiometry 2:1 (ligand: metal) was previously determined by the Job’s method and confirmed by single-crystal x-ray diffraction finding a propeller-like structure of the [Fe(Papy)₂] compound PapyH and the metal complexes were characterized by ¹H NMR and UV-visible spectroscopy, resp. The Cu²⁺ complex exhibited the highest stability constant, which was confirmed by competitive reaction of different metal ions with the ligand PapyH.

Inorganica Chimica Acta published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C11H10N4, Name: 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Bandarage, Upul K. published the artcileDiscovery of a Novel Series of Potent and Selective Alkynylthiazole-Derived PI3Kγ Inhibitors, Product Details of C8H7NO, the publication is ACS Medicinal Chemistry Letters (2021), 12(1), 129-135, database is CAplus and MEDLINE.

Phosphoinositide 3-kinases (PI3Ks) are a family of enzymes that control a wide variety of cellular functions such as cell growth, proliferation, differentiation, motility, survival, and intracellular trafficking. PI3Kγ plays a critical role in mediating leukocyte chemotaxis as well as mast cell degranulation, making it a potentially interesting target for autoimmune and inflammatory diseases. We previously disclosed a novel series of PI3Kγ inhibitors derived from a benzothiazole core. The truncation of the benzothiazole core led to the discovery of a structurally diverse alkynyl thiazole series which displayed high PI3Kγ potency and subtype selectivity. Further medicinal chem. optimization of the alkynyl thiazole series led to identification of compounds such as 14 and 32, highly potent, subtype selective, and CNS penetrant PI3Kγ inhibitors. Compound 14 showed robust inhibition of PI3Kγ mediated neutrophil migration in vivo.

ACS Medicinal Chemistry Letters published new progress about 1060816-39-8. 1060816-39-8 belongs to pyridine-derivatives, auxiliary class Pyridines, name is 4-Ethynyl-2-methoxypyridine, and the molecular formula is C8H7NO, Product Details of C8H7NO.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Wendt, Ida published the artcileEffects of Five Antifouling Biocides on Settlement and Growth of Zoospores from the Marine Macroalga Ulva lactuca L., Product Details of C23H20BN, the publication is Bulletin of Environmental Contamination and Toxicology (2013), 91(4), 426-432, database is CAplus and MEDLINE.

Antifouling biocides are found in the marine ecosystem were they can affect non-target organisms. In this study the effects of five antifouling biocides on the settlement and growth of Ulva lactuca zoospores were investigated. The biocides investigated were copper (Cu²⁺), 4,5-dichloro-2-n-octyl-3(2H)-isothiazolone (DCOIT), triphenylborane pyridine (TPBP), tolylfluanid and medetomidine. Full concentration-response curves where determined for each compound EC₅₀ values were determined for copper, DCOIT, TPBP and tolylfluanid, all of which inhibited settlement and growth in a concentration dependent manner with the following toxicity ranking; tolylfluanid (EC₅₀ 80 nmol L^-1) âˆ?DCOIT (EC₅₀ 83 nmol L^-1) > TPBP (EC₅₀ 400 nmol L^-1) > Cu²⁺ (EC₅₀ 2,000 nmol L^-1). Medetomidine inhibited settlement and growth only at the extreme concentration of 100,000 nmol L^-1 (93 % effect). The low toxicity is possibly a consequence of a lack of receptors that medetomidine can bind to in the U. lactuca zoospores.

Bulletin of Environmental Contamination and Toxicology published new progress about 971-66-4. 971-66-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is Triphenyl(pyridin-1-ium-1-yl)borate, and the molecular formula is C25H47NO8, Product Details of C23H20BN.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Le, Song Thi published the artcileSynthesis of 2-Aryl-5-Nitropyridines by Three-Component Ring Transformation of 3,5-Dinitro-2-Pyridone, SDS of cas: 89076-64-2, the publication is Asian Journal of Organic Chemistry (2014), 3(3), 297-302, database is CAplus.

2-Arylated-5-nitropyridines were efficiently synthesized by a three-component ring transformation of 3,5-dinitro-2-pyridone with aromatic ketones in the presence of ammonium acetate wherein the dinitropyridone served as a synthetic equivalent of an unstable nitromalonaldehyde. 2,8-Diazabicyclo[3.3.1]non-3-ene derivative was formed as a byproduct and was converted into nitropyridines by heating in the presence of ammonium acetate. This exptl. fact implied that the former compound was a kinetically controlled product and the latter was a thermodynamically controlled product because of the aromatization. This eco-friendly method was applicable to various kinds of aryl and (hetero)aryl ketones to afford the corresponding (hetero)arylated pyridines in good to excellent yields.

Asian Journal of Organic Chemistry published new progress about 89076-64-2. 89076-64-2 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitro Compound,Benzene, name is 5-Nitro-2-phenylpyridine, and the molecular formula is C11H8N2O2, SDS of cas: 89076-64-2.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Rozatian, Neshat published the artcileA quantitative reactivity scale for electrophilic fluorinating reagents, Related Products of pyridine-derivatives, the publication is Chemical Science (2018), 9(46), 8692-8702, database is CAplus and MEDLINE.

The N-F reagent was currently determined through empirical experimentation in the absence of quant. values for electrophilicities. An exptl.-determined kinetic reactivity scale for ten N-F fluorinating reagents, including Selectfluor, NFSI, Synfluor and several N-fluoropyridinium salts, in CH₃CN ws reported. The reactivity scale, which covers eight orders of magnitude, employs para-substituted 1,3-diaryl-1,3-dicarbonyl derivatives to measure relative and absolute rate constants The para-substituted 1,3-diaryl-1,3-dicarbonyl scaffold delivers a convenient, sensitive spectrophotometric reporter of reactivity that also led to the discovery of a unique form of tautomeric polymorphism.

Chemical Science published new progress about 107263-95-6. 107263-95-6 belongs to pyridine-derivatives, auxiliary class Fluorination reagent, name is 1-Fluoropyridiniumtriflate, and the molecular formula is C6H5F4NO3S, Related Products of pyridine-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem

Shao, Ning published the artcileSynthesis and structure-activity relationship (SAR) study of 4-azabenzoxazole analogues as H₃ antagonists, Related Products of pyridine-derivatives, the publication is Bioorganic & Medicinal Chemistry Letters (2012), 22(5), 2075-2078, database is CAplus and MEDLINE.

The synthesis and SAR of a novel series of 4-azabenzoxazole histamine H₃ antagonists is described. Introduction of substituted Ph, pyridyl, and fused heterocyclic groups to the 6-position of the 4-azabenzoxazole core gave a series of compounds with good H₃ antagonist activity in both ex vivo and in vivo assays.

Bioorganic & Medicinal Chemistry Letters published new progress about 197958-29-5. 197958-29-5 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester, name is 2-Pyridinylboronic acid, and the molecular formula is C13H19Br2ClN2O, Related Products of pyridine-derivatives.

Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem