Day: December 7, 2022

Gair, Joseph J. published the artcileSynthesis, Characterization, and Theoretical Investigation of a Transition State Analogue for Proton Transfer during C-H Activation by a Rhodium-Pincer Complex, COA of Formula: C23H43NP2, the publication is Organometallics (2019), 38(7), 1407-1412, database is CAplus.

A heterobimetallic Rh-pincer complex bearing a phenylzinc ligand was synthesized and characterized by multinuclear NMR, COSY, NOESY, and x-ray crystallog. The crystal structure of this complex shows that it possesses a bridging Rh-Zn-C fragment with a geometry similar to the Rh-H-C fragment in a proposed transition state for metal to ligand proton transfer during redox-neutral C-H activation with dearomatized Rh pincer complexes. Bonding anal. indicates that these fragments are isolobal, suggesting that the transition state analog models not only the structure but also the bonding interactions that underlie metal-ligand cooperativity in the C-H activation transition state. The similarity of the transition state and its analog prompted reevaluation of the relevant rate equations to determine the relative contributions of viable proton transfer pathways. Parallel anal. of the transition state and its isolobal analog thus serves as a bridge between theory and experiment that is rarely available in studies of bonding in transition states.

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, COA of Formula: C23H43NP2.

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

Wang, Heng-Yen published the artcilePotent and Selective Human Neuronal Nitric Oxide Synthase Inhibition by Optimization of the 2-Aminopyridine-Based Scaffold with a Pyridine Linker, Application In Synthesis of 844501-00-4, the publication is Journal of Medicinal Chemistry (2016), 59(10), 4913-4925, database is CAplus and MEDLINE.

Neuronal nitric oxide synthase (nNOS) is an important therapeutic target for the treatment of various neurodegenerative disorders. A major challenge in the design of nNOS inhibitors focuses on potency in humans and selectivity over other NOS isoforms. Here we report potent and selective human nNOS inhibitors based on the 2-aminopyridine scaffold with a central pyridine linker. Compound 14j, the most promising inhibitor in this study, exhibits excellent potency for rat nNOS (K_i = 16 nM) with 828-fold n/e and 118-fold n/i selectivity with a K_i value of 13 nM against human nNOS with 1761-fold human n/e selectivity. Compound 14j also displayed good metabolic stability in human liver microsomes, low plasma protein binding, and minimal binding to cytochromes P 450 (CYPs), although it had little to no Caco-2 permeability.

Journal of Medicinal Chemistry published new progress about 844501-00-4. 844501-00-4 belongs to pyridine-derivatives, auxiliary class Pyridine,Boronic acid and ester,Amide,Boronic Acids,Boronic acid and ester, name is (1-(tert-Butoxycarbonyl)-1,2,3,6-tetrahydropyridin-4-yl)boronic acid, and the molecular formula is C8H15ClN2, Application In Synthesis of 844501-00-4.

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

Zhu, Shengqing published the artcilePhotoredox-catalyzed branch-selective pyridylation of alkenes for the expedient synthesis of Triprolidine, Synthetic Route of 847225-56-3, the publication is Nature Communications (2019), 10(1), 1-7, database is CAplus.

A catalytic, branch-selective pyridylation of alkenes via a sulfinate assisted photoredox catalysis was reported. This reaction proceeded through a sequential radical addition/coupling/elimination, by utilizing readily available sodium sulfinates as reusable radical precursors as well as traceless elimination groups. This versatile protocol allows for the installation of important vinylpyridines with complete branched selectivity under mild conditions. Furthermore, this catalytic manifold was successfully applied to the expedient synthesis of Triprolidine.

Nature Communications published new progress about 847225-56-3. 847225-56-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Fluoride,Nitrile, name is 4-Fluoropicolinonitrile, and the molecular formula is C19H14N2, Synthetic Route of 847225-56-3.

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

Xu, Pengcheng published the artcilePalladium-catalyzed dearomative cyclocarbonylation of allyl alcohol for the synthesis of quinolizinones, Computed Properties of 91-02-1, the publication is Organic & Biomolecular Chemistry (2021), 19(6), 1274-1277, database is CAplus and MEDLINE.

An approach for the synthesis of quinolizinone I (R = H, 6-Me, 7-F, etc.; R¹ = H, Me, Ph; R² = H, Me, pentyl; R³ = H, Me; X = N, CH) with potential bioactivity has been developed via palladium-catalytic dearomative cyclocarbonylation of allyl alc. R⁴C(R¹)=C(R²)CH(R³)OH (R⁴ = pyridin-2-yl, 5-fluoropyridin-2-yl, pyrazin-2-yl, etc.). Diverse quinolizinone compounds I could be attained with good efficiencies. A feasible reaction pathway could be a successive procedure of allylation, dearomatization, CO insertion and the Heck reaction.

Organic & Biomolecular Chemistry 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 C10H10O2, Computed Properties of 91-02-1.

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

Li, Jialing published the artcileReversible Switching of Molecular Conductance in Viologens is Controlled by the Electrochemical Environment, Application of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, the publication is Journal of Physical Chemistry C (2021), 125(40), 21862-21872, database is CAplus.

Charge transport in electrochem. energy-storage systems critically relies on supporting electrolytes to maintain ionic strength and solution conductivity Despite recent progress, it is not fully understood how the solvation environment affects mol. charge transport of redox-active species near electrode interfaces. The authors characterize the charge-transport properties of bipyridinium mols. in different supporting electrolyte and counterion environments using a combination of experiments and computational modeling. The authors’ results show that mol. charge transport in viologens critically depends on the chem. identity of counterions and the solvation environment. Using an electrochem. scanning tunneling microscope-break junction (ECSTM-BJ) instrument, the authors observe a large and reversible 10-fold enhancement in mol. conductance upon electrochem. reduction of the viologen redox pair (V^2+/+) to the radical cationic state in the electrolytic solution D. functional theory (DFT) simulations show that charge transport is enhanced due to mol. conformational changes and planarization resulting from interactions with different counterions, which ultimately leads to enhanced charge transport in the reduced state. Overall, this work highlights the role of the counterion species on electrochem. charge transport in redox-active mols. that underpin the design of new energy-storage systems or programmable mol. electronic devices.

Journal of Physical Chemistry C published new progress about 47369-00-6. 47369-00-6 belongs to pyridine-derivatives, auxiliary class Pyridine,Salt,Benzene,Organic ligands for MOF materials,Nitrogen containing MOF ligands,Nitrogen containing MOF ligands, name is 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride, and the molecular formula is C22H18Cl2N2, Application of 1,1′-Diphenyl-[4,4′-bipyridine]-1,1′-diium chloride.

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

Jiang, Nan published the artcilePerdeuterated pyridinium molten salt (ionic liquid) for direct dissolution and NMR analysis of plant cell walls, Category: pyridine-derivatives, the publication is Green Chemistry (2009), 11(11), 1762-1766, database is CAplus.

A bi-solvent system consisting of perdeuterated pyridinium molten salt and DMSO-d₆ has been developed for direct dissolution and NMR anal. of plant cell walls, which will shed a new light on efficient detailed structure of the plant cell walls and benefit lignin engineering for biofuel and biomaterial research.

Green Chemistry published new progress about 17281-59-3. 17281-59-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitrile,Salt, name is 1-(Cyanomethyl)pyridin-1-ium chloride, and the molecular formula is C7H7ClN2, Category: pyridine-derivatives.

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

Jiang, Nan published the artcileDirect dissolution and NMR analysis of the plant cell walls via perdeuterated pyridinium-based ionic liquid, HPLC of Formula: 17281-59-3, the publication is Preprints of Symposia – American Chemical Society, Division of Fuel Chemistry (2010), 55(1), 235-236, database is CAplus.

This article presents the perdeuterated pyridinium ionic liquid system for direct dissolution and NMR anal. of the Wiley milled and ball-milled plant cell walls to reveal the detailed structure of the plant cell walls. The unique properties and easy preparation of pyridinium-based ionic liquid [Hpyr]Cl-d₆ offer significant benefits over imidazolium-based ionic liquids for NMR characterization of the non-ball-milled plant cell walls. Further applications of this novel ionic liquid-based solvent system include the determination of lignin content, H:S:G ratios and inter-unit lignin bonding arrangements, without the need for lengthy lignin isolation procedures.

Preprints of Symposia – American Chemical Society, Division of Fuel Chemistry published new progress about 17281-59-3. 17281-59-3 belongs to pyridine-derivatives, auxiliary class Pyridine,Nitrile,Salt, name is 1-(Cyanomethyl)pyridin-1-ium chloride, and the molecular formula is C7H7ClN2, HPLC of Formula: 17281-59-3.

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

Novais, Teddy published the artcilePotentially inappropriate medications and anticholinergic and sedative burden in older patients with haemophilia or von Willebrand disease: The M’HEMORRH-AGE study, Category: pyridine-derivatives, the publication is Journal of Clinical Pharmacy and Therapeutics (2022), 47(6), 783-791, database is CAplus and MEDLINE.

In older patients, multiple chronic conditions lead to the intake of multiple medications and a higher risk of adverse drug events. The exposure to inappropriate medications in older patients with bleeding disorders is poorly explored. The aim of this study was to describe the exposure to potentially inappropriate medications (PIMs) and medications with anticholinergic and sedative properties in older community-dwelling patients with haemophilia or von Willebrand Disease (VWD). The M’HEMORRH-AGE study (Medication in AGEd patients with HAEMORRHagic disease) is a multicentre prospective observational study. Community-dwelling patients over 65 years with haemophilia or VWD were included in the study. PIMs were identified using the EU(7)-PIM list, and the anticholinergic and sedative drug exposure was measured using the Drug Burden Index. In 142 older community-dwelling patients with haemophilia (n = 89) or VWD (n = 53) were included (mean age: 72.8 ± 5.8 years). PIMs were used by 45.8% of older patients and were mainly represented by cardiovascular (34.9%), nervous systems (26.7%) and alimentary tract and metabolism PIMs (25.6%). Regarding anticholinergic and/or sedative medications, 37.3% of older patients were exposed mainly due to nervous system medications (68.3%), for example analgesics. The MHEMORRH-AGE study showed the exposure to PIMs and anticholinergic/sedative medications was high in older community-dwelling patients with haemophilia or VWD. Interventions focusing on deprescription of these inappropriate medications should be conducted in this specific population.

Journal of Clinical Pharmacy and Therapeutics published new progress about 21829-25-4. 21829-25-4 belongs to pyridine-derivatives, auxiliary class Membrane Transporter/Ion Channel,Calcium Channel, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Category: pyridine-derivatives.

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

Lombardini, John B. published the artcileEffects of kinase inhibitors and taurine analogs on the phosphorylation of specific proteins in mitochondrial fractions of rat heart and retina, SDS of cas: 636-73-7, the publication is Advances in Experimental Medicine and Biology (1996), 343-350, database is CAplus.

Quant. effects of various kinase inhibitors, specifically chelerythrine chloride, staurosporine, and W-7, and various taurine analogs (singly and in combination with taurine) on the phosphorylation of both the cardiac 44 kDa and retinal 20 kDa proteins are reported. Effects of the analogs on phosphorylation of both proteins suggest that the structural requirements for being either an inhibitor or stimulator are rather restricted.

Advances in Experimental Medicine and Biology 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, SDS of cas: 636-73-7.

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

Lombardini, J. B. published the artcileAnalogs of taurine as inhibitors of the phosphorylation of an �0 K molecular weight protein present in a mitochondrial fraction of the rat retina, SDS of cas: 636-73-7, the publication is Amino Acids (1997), 13(2), 115-130, database is CAplus.

It was previously demonstrated that taurine inhibits the phosphorylation of a â‰?0 K apparent mol. weight protein present in the mitochondrial fraction of the rat retina. Analogs of taurine were tested for their inhibitory activity on the phosphorylation of this 20 K protein. The most potent analogs were (±)trans-2-aminocyclopentanesulfonic acid (TAPS) and 1,2,3,4-tetrahydroquinoline-8-sulfonic acid (THQS), which were 21 and 7 times more potent than the parent compound, taurine, resp. Median-effect plots were used to calculate the inhibitory median effect and combination index values for the combined effects of taurine and taurine analogs. It was determined that the inhibitory taurine analogs were antagonistic to taurine when used in combination with taurine to inhibit the phosphorylation of the 20 K apparent mol. weight protein. It was concluded that the distance between the N and S atoms in the taurine structure was important for inhibitory activity. If the N atom was either within or attached to an unsaturated ring structure, the inhibitory potency was decreased. If both the S and N atoms were present within the ring structure, the analog has no activity.

Amino Acids 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, SDS of cas: 636-73-7.

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