Category: pyridine-derivatives

Umemoto, Teruo published the artcileN-F 19-fluorine nuclear magnetic resonance of N-fluoropyridinium salts, HPLC of Formula: 107263-95-6, the publication is Journal of Fluorine Chemistry (1991), 53(3), 369-77, database is CAplus.

The completely ionic structure of N-fluoropyridinium salts is supported by their N-F ¹⁹F chem. shifts which are independent of the nature of the counteranions. The ¹⁹F chem. shifts of β- and γ-substituted N-fluoropyridinium salts are both correlated to pKa values of the corresponding pyridines, but in different ways. However, the shifts of α-substituted N-fluoro salts except for those with alkyl substituents were abnormally shifted upfield due to nonbonded electronic interactions, regardless of their pKa’s. The relationship between variable fluorinating power and ¹⁹F chem. shifts of N-fluoropyridinium salt is also discussed.

Journal of Fluorine Chemistry 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 C27H39ClN2, HPLC of Formula: 107263-95-6.

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

Yang, Yang published the artcileSynthetic versatility of 2-substituted-6-methyl 2,3-dihydropyridinones in the synthesis of polyfunctional piperidine-based compounds and related β amino acid derivatives, Recommanded Product: 2-Pyridinylboronic acid, the publication is Organic & Biomolecular Chemistry (2017), 15(40), 8576-8593, database is CAplus and MEDLINE.

Chiral 2-substituted-6-Me 2,3-dihydropyidinones (I) (R¹ = cyclohexyl, n-pentyl, CH₂TBSO, n-butyl), which can be facilely obtained from an asym. vinylogous Mannich reaction (VMR) with 1,3-bis-trimethylsilyl enol ether, were used as versatile intermediates in constructing chiral polyfunctional piperidine-based compounds The 6-Me group of such compounds can be conveniently functionalized via alkylation and acylation reactions to provide efficient entries to the synthesis of a variety of chiral multi-substituted piperidine-based compounds Further elaboration of the corresponding intermediates also provided access to polyfunctional indolizidine-based compounds These methods were showcased in an asym. synthesis of 2,6-di-substituted piperidine compound (II), reported as the key intermediate in the synthesis of (+)-calvine and a natural alkaloid (-)-indolizidine 209D. Furthermore, selective C5 iodination of compound I enabled the installation of addnl. functional groups at this position. Finally, we demonstrated that the oxidative cleavage of 2-substituted-6-methyl-2,3-dihydropyidinones is a practical and efficient method for the enantioselective synthesis of β-amino acids, which can undergo further intra-mol. cyclization to give the corresponding chiral four-membered β-lactam derivatives

Organic & Biomolecular Chemistry 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 C13H18BNO3, Recommanded Product: 2-Pyridinylboronic acid.

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

Zhao, Zhijian published the artcileSynthesis and optimization of N-heterocyclic pyridinones as catechol-O-methyltransferase (COMT) inhibitors, COA of Formula: C5H6BNO2, the publication is Bioorganic & Medicinal Chemistry Letters (2016), 26(12), 2952-2956, database is CAplus and MEDLINE.

A series of N-heterocyclic pyridinone catechol-O-methyltransferase (COMT) inhibitors were synthesized. Physicochem. properties, including ligand lipophilic efficiency (LLE) and clog P, were used to guide compound design and attempt to improve inhibitor pharmacokinetics. Incorporation of heterocyclic central rings provided improvements in physicochem. parameters but did not significantly reduce in vitro or in vivo clearance. Nevertheless, compound I was identified as a potent inhibitor with sufficient in vivo exposure to significantly affect the dopamine metabolites homovanillic acid (HVA) and dihydroxyphenylacetic acid (DOPAC), and indicate central COMT inhibition.

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 C18H24N6O6S4, COA of Formula: C5H6BNO2.

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

Rozatian, Neshat published the artcileKinetics of Electrophilic Fluorination of Steroids and Epimerisation of Fluorosteroids, Category: pyridine-derivatives, the publication is Chemistry – A European Journal (2020), 26(52), 12027-12035, database is CAplus and MEDLINE.

Fluorinated steroids, which are synthesized by electrophilic fluorination, form a significant proportion of marketed pharmaceuticals. To gain quant. information on fluorination at the 6-position of steroids, kinetics studies were conducted on enol ester derivatives of progesterone, testosterone, cholestenone and hydrocortisone with a series of electrophilic N-F reagents. The stereoselectivities of fluorination reactions of progesterone enol acetate and the kinetic effects of additives, including methanol and water, were investigated. The kinetics of epimerization of 6β-fluoroprogesterone to the more pharmacol. active 6α-fluoroprogesterone isomer in HCl/acetic acid solutions are detailed.

Chemistry – A European Journal 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, Category: pyridine-derivatives.

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

Kawatsura, Motoi published the artcileTransition Metal-Catalyzed Addition of Amines to Acrylic Acid Derivatives. A High-Throughput Method for Evaluating Hydroamination of Primary and Secondary Alkylamines, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine, the publication is Organometallics (2001), 20(10), 1960-1964, database is CAplus.

Several new classes of transition metal-catalyzed reactions of amines with the C:C bond of acrylic acid derivatives were discovered using a high-throughput colorimetric assay. This assay is general for the reactions of primary and secondary alkylamines with acrylic acid derivatives, and the screening of potential catalysts using this assay revealed a number of different metal/ligand combinations that promote these hydroaminations. The colorimetric assay revealed catalysts for the addition of piperidine to methacrylonitrile, crotononitrile, Et crotonate, and Et methacrylate, as well as catalysts for reactions of butylamine and aniline with methacrylonitrile, with product yields of 89-99%. A catalyst for the addition of aniline to crotononitrile at 100° was also discovered. Thus, treating crotononitrile with aniline in presence of 10% Pd(OAc)₂ and 10% 1,3-bis[(di-tert-butylphosphino)methyl]benzene gave 90% 2-anilinopropyl cyanide. The products of these reactions are basic building blocks for the synthesis of β-amino acids, amino alcs., and diamines. These reactions may ultimately produce an enantioselective route to optically active difunctional materials from commodity reagents.

Organometallics 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, Application of 2,6-Bis((di-tert-butylphosphino)methyl)pyridine.

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

Weber, Jeremy E. published the artcileElectronic and Spin-State Effects on Dinitrogen Splitting to Nitrides in a Rhenium Pincer System, Computed Properties of 971-66-4, the publication is Inorganic Chemistry (2021), 60(9), 6115-6124, database is CAplus and MEDLINE.

Bimetallic nitrogen (N₂) splitting to form metal nitrides is an attractive method for N₂ fixation. Although a growing number of pincer-supported systems can bind and split N₂, the precise relation between the ligand properties and N₂ binding/splitting remains elusive. Here the authors report the first example of an N₂-bridged rhenium(III) complex, [(trans-P₂^tBuPyrr)ReCl₂]₂(μ-η¹:η¹-N₂) (P₂^tBuPyrr = [2,5-(CH₂P^tBu₂)₂C₄H₂N]^–). In this case, N₂ binding occurs at a higher oxidation level than that in other reported pincer analogs. Anal. of the electronic structure through computational studies shows that the weakly π-donor pincer ligand stabilizes an open-shell electronic configuration that leads to enhanced binding of N₂ in the bridged complex. Using SQUID magnetometry, the authors demonstrate a singlet ground state for this Re-N-N-Re complex, and the authors offer tentative explanations for antiferromagnetic coupling of the two local S = 1 sites. Reduction and subsequent heating of the rhenium(III)-dinitrogen complex leads to chloride loss and cleavage of the N-N bond with isolation of the terminal rhenium(V) nitride complex (P₂^tBuPyrr)ReNCl.

Inorganic Chemistry 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 C5H5F3O2, Computed Properties of 971-66-4.

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

Tsunemasa, Noritaka published the artcileContamination of an alternative antifoulant in coastal waters of Hiroshima Bay, Product Details of C23H20BN, the publication is Kankyo Kagaku (2006), 16(2), 201-211, database is CAplus.

It is well known that organotin (OT) compounds, which are used as effective antifouling biocides, have deleterious effects on nontarget marine organisms when released into water from the coatings applied to boat hulls, and environmental studies have indicated OT contamination of the marine environment on a worldwide scale. In Oct. 2001, the International Maritime Organization (IMO) adopted the International Convention on the Control of Harmful Antifouling Systems (AFS Convention), which prohibited the use of OTs as active ingredients in antifouling systems for ships. Following the international restrictions on the use of OT-based antifoulants, paint manufactures have developed many alternative products. In Japan, more than 20 chem. substances have been used or proposed as alternative compounds In the present study, Sea-nine211, KH101, Diuron, Irgarol 1051 and the latters degradation product M1 were investigated in water from Hiroshima Bay. Concentrations of Sea-nine211, Diuron, Irgarol 1051 and M1 in water samples were in the range of <0.023âˆ?.10, <0.040âˆ?.43, <0.092, and <0.031âˆ?.3 μg/L, resp. KH101 was not detected in the water samples.

Kankyo Kagaku 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 C8H10O2, Product Details of C23H20BN.

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

Hoque, Emdadul Md published the artcileRemarkably Efficient Iridium Catalysts for Directed C(sp²)-H and C(sp³)-H Borylation of Diverse Classes of Substrates, Recommanded Product: 5-Methyl-2-(p-tolyl)pyridine, the publication is Journal of the American Chemical Society (2021), 143(13), 5022-5037, database is CAplus and MEDLINE.

Here we describe the discovery of a new class of C-H borylation catalysts and their use for regioselective C-H borylation of aromatic, heteroaromatic, and aliphatic systems. The new catalysts have Ir-C(thienyl) or Ir-C(furyl) anionic ligands instead of the diamine-type neutral chelating ligands used in the standard C-H borylation conditions. It is reported that the employment of these newly discovered catalysts show excellent reactivity and ortho-selectivity for diverse classes of aromatic substrates with high isolated yields. Moreover, the catalysts proved to be efficient for a wide number of aliphatic substrates for selective C(sp³)-H bond borylations. Heterocyclic mols. are selectively borylated using the inherently elevated reactivity of the C-H bonds. A number of late-stage C-H functionalization have been described using the same catalysts. Furthermore, we show that one of the catalysts could be used even in open air for the C(sp²)-H and C(sp³)-H borylations enabling the method more general. Preliminary mechanistic studies suggest that the active catalytic intermediate is the Ir(bis)boryl complex, and the attached ligand acts as bidentate ligand. Collectively, this study underlines the discovery of new class of C-H borylation catalysts that should find wide application in the context of C-H functionalization chem.

Journal of the American Chemical Society published new progress about 85237-71-4. 85237-71-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is 5-Methyl-2-(p-tolyl)pyridine, and the molecular formula is C13H13N, Recommanded Product: 5-Methyl-2-(p-tolyl)pyridine.

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

Jafarpour, Farnaz published the artcilePalladium-catalyzed chelation-assisted C-H bond halogenation: selective chlorination of 2-arylpyridines with acid chlorides, SDS of cas: 85237-71-4, the publication is Synthesis (2014), 46(9), 1224-1228, 5 pp., database is CAplus.

Palladium-catalyzed chelation-assisted C-H bond halogenation of arenes using acid chlorides as chlorinating agents is reported. E.g., in presence of PdCl₂ and CuCl₂ in 1,4-dioxane at 140 °C, regioselective chlorination of 2-phenylpyridine by PhCOCl gave 92% I. This method provides a monoselective, straightforward, and clean route for the construction of aryl chlorides as privileged motifs in organic transformations.

Synthesis published new progress about 85237-71-4. 85237-71-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene, name is 5-Methyl-2-(p-tolyl)pyridine, and the molecular formula is C13H13N, SDS of cas: 85237-71-4.

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

Garai, Rabindranath published the artcileTriple Passivation Approach to Laminate Perovskite Layers for Augmented UV and Ambient Stable Photovoltaics, Recommanded Product: Phenyl(pyridin-2-yl)methanone, the publication is ACS Applied Energy Materials (2022), 5(3), 3392-3400, database is CAplus.

The instability of the perovskite solar cells (PSCs) toward UV irradiation and moisture is a limiting factor in terms of commercialization even after achieving excellent power conversion efficiencies (PCEs). Herein, an advanced triple passivation technique has been strategically designed and demonstrated utilizing UV-absorbing 2-benzoylpyridine (BP) mols. as a passivation additive to laminate perovskites and improve PSC stability. Double layers of BP were coated on both sides of the perovskite layer, and the mol. was also incorporated into the precursor solution This strategy significantly improved the perovskite crystallinity and film quality, lowered the recombination, and enhanced the carrier transport in the PSC. The triple-passivated device exhibited a high PCE of 20.46% with almost negligible hysteresis. Further, passivated large-area (2.5 cm²) devices were also fabricated that demonstrated a PCE of 18.61%. Moreover, the triple passivation approach exhibited impressive UV and ambient stability because it can effectively shield the perovskite layer from UV illumination and moisture.

ACS Applied Energy Materials published new progress about 91-02-1. 91-02-1 belongs to pyridine-derivatives, auxiliary class Pyridine,Benzene,Ketone, name is Phenyl(pyridin-2-yl)methanone, and the molecular formula is C12H9NO, Recommanded Product: Phenyl(pyridin-2-yl)methanone.

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