Category: pyridine-derivatives

Seet, Ai-Mee published the artcileSpectrophotometric determination of palladium(II) using 1,3-bis(2′-pyridyl)-1,2-diazaprop-2-ene, Application of 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, the publication is Mikrochimica Acta (1974), 235-43, database is CAplus.

Pd was determined spectrophotometrically at 573 nm (molar absorptivity was 1.8 × 104) after complexation in 0.05N HCl with 1,3-bis-(2-pyridyl)-1,2-diaza-2-propene (I) and extraction of the complex into C6H6. Beer’s law was obeyed for â‰?00 μg Pd when the complex is extracted into 10 ml. C6H6. Complexes with 1:1 and 2:1 Pd-I mole ratios were formed. For determinations of 10-80 μg Pd, relative standard deviations were 1.99-4.64%.

Mikrochimica 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 C9H5ClO4S, Application of 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine.

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

Seet, Ai-Mee published the artcileDetermination and properties of erythrocyte lipoyl dehydrogenase, SDS of cas: 2215-33-0, the publication is Mikrochimica Acta (1975), 2(4-5), 407-12, database is CAplus.

Erythrocyte lipoyl dehydrogenase activity was determined colorimetrically with Pd(II)-1,3-bis(2′-pyridyl)-1,2-diazaprop-2-ene. The properties of red cell enzyme were described and normal values for erythrocyte lipoyl dehydrogenase were given. The possible role of this enzyme in the erythrocytes was discussed.

Mikrochimica 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 C9H5ClO4S, SDS of cas: 2215-33-0.

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

Hoyt, Caroline B. published the artcileSelective C(sp³)-H Monoarylation Catalyzed by a Covalently Cross-Linked Reverse Micelle-Supported Palladium Catalyst, Name: 4-Amino-2-picoline, the publication is Advanced Synthesis & Catalysis (2017), 359(20), 3611-3617, database is CAplus.

In this work, we illustrate the performance of a solvated micelle-supported ligand as a platform for coordination with palladium for C-H arylation. The micelle-supported ligand is one of the first applications of a micelle-supported ligand for C-H arylation, and provides a tunable support for future elaboration. The use of a spatially constrained system promoted selectivity trends influenced by both the sterics and electronics of the system, differing from the homogeneous catalyst, with high yields and selectivities.

Advanced Synthesis & Catalysis published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C6H8N2, Name: 4-Amino-2-picoline.

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

Reams, Steve G. published the artcileEffect of chelating agents and respiratory inhibitors on regulation of the cadA gene in Escherichia coli, Related Products of pyridine-derivatives, the publication is Archives of Microbiology (1997), 167(4), 209-216, database is CAplus and MEDLINE.

The cadA gene that encodes Lys decarboxylase in E. coli is induced by low pH and during anaerobic growth by Lys. Operon fusions of cadA to lacZ was used to investigate the effects of aeration on cadA regulation. When an insertion mutation in osmZ (= hns) was introduced, a cadA-lacZ fusion was derepressed in the presence of air to approx. the same level as seen during anaerobic growth. The pH-dependent regulation of cadA was not affected by osmZ. Introduction of mutations in rpoS, fur, or fnr had no effect on cadA expression. Defects in arcB or arcA largely abolished expression of cadA during anaerobic growth. Nonetheless, strains defective in both arcB and osmZ showed the same high cadA-lac expression in air as seen in the single osmZ derivatives Blocking the respiratory chain with mutations or chem. inhibitors also caused derepression of a cadA-lacZ fusion in air, while agents affecting the proton gradient had no effect. Derepression of cadA in air was also mediated by several chelating agents, in particular by methoxyindole carboxylic acid. Addition of Fe²⁺ overcame this effect. Chelating agents also abolished the expression during aerobic growth of several genes known to be under arcAB control and which are normally repressed during anaerobic growth but induced in the presence of air. This implies that the effect of chelating agents on cadA expression is mediated via the arcAB regulatory system.

Archives of Microbiology published new progress about 636-73-7. 636-73-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Sulfonic acid, name is Pyridine-3-sulfonic acid, and the molecular formula is C5H5NO3S, Related Products of pyridine-derivatives.

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

Gomez Fernandez, Mario Andres published the artcileStudies on The Application of The Paterno-Buechi Reaction to The Synthesis of Novel Fluorinated Scaffolds, Quality Control of 91-02-1, the publication is Chemistry – A European Journal (2021), 27(63), 15722-15729, database is CAplus and MEDLINE.

In the context of new scaffolds obtained by photochem. reactions, Paterno-Buechi reactions between heteroaromatic, trifluoromethylphenyl ketone and electron rich alkenes to give oxetanes are described. A comprehensive study has been carried out on the reaction of aromatic ketones with fluorinated alkenes. Depending on the substitution pattern at the oxetane ring, a metathesis reaction is described as a minor side process to give mono-fluorinated alkenes. Overall, this last reaction corresponds to a photo-Wittig reaction and yields amide isosteres. In order to explain the uncommon regioselectivity of the Paterno-Buechi reaction with these alkenes, electrostatic-potential-derived charges (ESP) have been determined In a second computational study, the relative stabilities of the typical 1,4-diradical intermediates of the Paterno-Buechi reaction have been determined The results explain the regioselectivity. Further transformations of the oxetanes or previous functionalization of the fluoroalkenes open perspectives for oxetanes as core structures for biol. active compounds

Chemistry – A European Journal 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, Quality Control of 91-02-1.

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

Hood, Thomas M. published the artcileSynthesis and Structural Dynamics of Five-Coordinate Rh(III) and Ir(III) PNP and PONOP Pincer Complexes, COA of Formula: C23H43NP2, the publication is Inorganic Chemistry (2019), 58(11), 7593-7601, database is CAplus and MEDLINE.

The synthesis and characterization of a homologous series of five-coordinate Rh(III) and Ir(III) complexes of PNP (2,6-(tBu₂PCH₂)₂C₅H₃N) and PONOP (2,6-(tBu₂PO)₂C₅H₃N) pincer ligands are described: [M(PNP)(biph)][BAr^F₄] (M = Rh, 1a; Ir, 1b; biph = 2,2′-biphenyl; Ar^F = 3,5-(CF₃)₂C₆H₃) and [M(PONOP)(biph)][BAr^F₄] (M = Rh, 2a; Ir, 2b). These complexes are structurally dynamic in solution, exhibiting pseudorotation of the biph ligand on the ¹H NMR time scale (ΔG^{îŒ?/sup> âˆ?0 kJ mol-1) and, in the case of the flexible PNP complexes, undergoing interconversion between helical and puckered pincer ligand conformations (ΔGîŒ?/sup> âˆ?0 kJ mol-1). Remarkably, the latter is sufficiently facile that it persists in the solid state, leading to temperature-dependent disorder in the associated x-ray crystal structures. Reaction of 1 and 2 with CO occurs for the Ir congeners 1b and 2b, giving sterically congested carbonyl derivatives}

Inorganic 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, COA of Formula: C23H43NP2.

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

Vekariya, Rakesh H. published the artcileSynthesis and Structure-Activity Relationships of 5′-Aryl-14-alkoxypyridomorphinans: Identification of a μ Opioid Receptor Agonist/δ Opioid Receptor Antagonist Ligand with Systemic Antinociceptive Activity and Diminished Opioid Side Effects, Product Details of C5H6BNO2, the publication is Journal of Medicinal Chemistry (2020), 63(14), 7663-7694, database is CAplus and MEDLINE.

We previously identified a pyridomorphinan (6, SRI-22138) possessing a 4-chlorophenyl substituent at the 5′-position on the pyridine and a 3-phenylpropoxy at the 14-position of the morphinan as a mixed μ opioid receptor (MOR) agonist and δ/κ opioid receptor (DOR/KOR) antagonist with potent antinociceptive activity and diminished tolerance and dependence in rodents. Structural variations at the 5′- and 14-positions of this mol. gave insights into the structure-activity relationships for binding and functional activity. Subtle structural changes exerted significant influence, particularly on the ability of the compounds to function as agonists at the MOR. In vivo evaluation identified compound 20(I) (SRI-39067) as a MOR agonist/DOR antagonist that produced systemically active potent antinociceptive activity in tail-flick assay in mice, with diminished tolerance, dependence/withdrawal, reward liability, and respiratory depression vs. morphine. These results support the hypothesis that mixed MOR agonist/DOR antagonist ligands may emerge as novel opioid analgesics with reduced side effects.

Journal of Medicinal 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 C9H5ClO4S, Product Details of C5H6BNO2.

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

Raboisson, Pierre published the artcileEvaluation of the anti-hepatitis C virus effect of novel potent, selective, and orally bioavailable JNK and VEGFR kinase inhibitors, Synthetic Route of 18437-58-6, the publication is Bioorganic & Medicinal Chemistry Letters (2007), 17(7), 1843-1849, database is CAplus and MEDLINE.

Screening of a focused library of TGF beta kinase inhibitors in the cellular HCV replicon model with luciferase read out yielded a number of low micromolar HCV inhibitors. Medicinal chem. driven optimization resulted in the discovery of 4-[2-(5-bromo-2-fluoro-phenyl)pteridin-4-ylamino]-N-[3-(2- oxopyrrolidin-1-yl)propyl]nicotinamide 36 with a replicon EC₅₀ of 64 nM, associated with a selective kinase inhibitory profile for human JNK kinases 2 and 3 as well as VEGFR-1, 2, and 3 kinases. Moreover, 36 showed an advantageous PK profile in mice. Experiments performed using different replicon constructs suggest that this series of kinase inhibitors might mediate their effect through the HCV non-structural protein 5A (NS5A).

Bioorganic & Medicinal Chemistry Letters published new progress about 18437-58-6. 18437-58-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 4-Amino-2-picoline, and the molecular formula is C6H8N2, Synthetic Route of 18437-58-6.

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

Matsuo, Yutaka published the artcileSynthesis of Metal Fullerene Complexes by the Use of Fullerene Halides, Recommanded Product: 1-Fluoropyridiniumtriflate, the publication is Organometallics (2008), 27(14), 3403-3409, database is CAplus.

K(C₆₀R₅) (1, R = Me, Ph) was generated by deprotonation of C₆₀R₅H (2) and allowed to react with N-fluoropyridinium triflate and N-chloro- and N-bromosuccinimide in benzene at 25° for 10 min to obtain halogenated fullerenes C₆₀R₅X (3a: R = Me, X = F; 3b: R = Me, X = Cl; 3c: R = Me, X = Br; 4a: R = Ph, X = F; 4b: R = Ph, X = Cl, 4c: R = Ph, X = Br) in good yield. The pentamethyl[60]fullerene halides are useful for the synthesis of a variety of η⁵-fullerene metal complexes. The reaction of the fullerene bromide 3c with the low-valent transition metal complexes Na[Re(CO)₄], Fe(CO)₅, Ru₃(CO)₁₂, and Na[Co(CO)₄] gave Re(η⁵-C₆₀Me₅)(CO)₃ (5), Fe(η⁵-C₆₀Me₅)Br(CO)₂ (6), Ru(η⁵-C₆₀Me₅)Br(CO)₂ (7), and Co(η⁵-C₆₀Me₅)(CO)₂ (8), resp. The structures of halide 3c and rhenium complex 5 were determined by x-ray crystallog. Electrochem. measurements on 3b and 3c were also performed. The iron complex 6 was converted into Fe(η⁵-C₆₀Me₅)Cp (9), Fe(η⁵-C₆₀Me₅)Me(CO)₂ (10), Fe(η⁵-C₆₀Me₅)(CO)₂(CCH) (11), and Fe(η⁵-C₆₀Me₅)(CO)₂(CCPh) (12), by ligand exchange reactions.

Organometallics 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, Recommanded Product: 1-Fluoropyridiniumtriflate.

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

Hu, Essa published the artcileDiscovery of potent, selective, and metabolically stable 4-(pyridin-3-yl)cinnolines as novel phosphodiesterase 10A (PDE10A) inhibitors, HPLC of Formula: 1366482-32-7, the publication is Bioorganic & Medicinal Chemistry Letters (2012), 22(6), 2262-2265, database is CAplus and MEDLINE.

Aminopyridinyl-substituted dimethoxycinnolines such as piperidinylpyridinyl dimethoxycinnolines I (R = H, Me, Cl, F₂CH, cyclopropyl; R¹ = HO, HOCMe₂; R² = H, Me, cyclopropyl, 2-pyridinyl) were prepared as selective inhibitors of phosphodiesterase 10A (PDE10A) for potential use in the treatment of schizophrenia. Bromodimethoxycinnoline II was prepared in two steps from 2-amino-4,5-dimethoxyacetophenone; Suzuki coupling of II with fluoropyridinyl boronic acids followed by aryl substitution reactions with amines and nitrogen heterocycles yielded aminopyridinyl-substituted dimethoxycinnolines. I (R = H, Me, Cl, F₂CH, cyclopropyl; R¹ = HO, HOCMe₂; R² = H, Me, cyclopropyl, 2-pyridinyl) inhibited PDE10A with IC₅₀ values of 1.3-13.2 nM and were selective for PDE10A over phosphodiesterases 1-9 and 11 (particularly PDE3) by greater than 350-fold. I (R = H, Me, Cl, F₂CH, cyclopropyl; R¹ = HO, HOCMe₂; R² = H, Me, cyclopropyl, 2-pyridinyl), in which the piperidinyl moiety was hydroxy- or hydroxyalkyl-substituted, showed reduced clearance in rats [0.15-2.15 L/(h × kg)] relative to methoxyethyl- and methoxyazetidinyl-substituted pyridinyl cinnolines. I (R = Me; R¹ = HO; R² = 2-pyridinyl) suppressed the conditioned avoidance response in rats (a model of schizophrenia) at a dosage of 5.6 mg/kg. The structure of I (R = Me; R¹ = HOCMe₂; R² = H) bound to the catalytic domain of human PDE10A was determined by X-ray crystallog.

Bioorganic & Medicinal Chemistry Letters published new progress about 1366482-32-7. 1366482-32-7 belongs to pyridine-derivatives, auxiliary class Pyridine,Fluoride,Chloride,Boronic acid and ester,Boronic Acids,Boronic Acids,Boronic acid and ester,, name is (5-Chloro-6-fluoropyridin-3-yl)boronic acid, and the molecular formula is C5H4BClFNO2, HPLC of Formula: 1366482-32-7.

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