Day: October 24, 2022

Kazancioglu, Mustafa Z.; Quirion, Kevin; Wipf, Peter; Skoda, Erin M. published an article in 2022. The article was titled 《Enantioselective synthesis and selective functionalization of 4-aminotetrahydroquinolines as novel GLP-1 secretagogues》, and you may find the article in Chirality.Quality Control of 2-(Bromomethyl)pyridine hydrobromide The information in the text is summarized as follows:

Polysubstituted tetrahydroquinolines were obtained in moderate to high yields (28% to 92%) and enantiomeric ratios (er 89:11 to 99:1) by a three-component Povarov reaction using a chiral phosphoric acid catalyst. Significantly, post-Povarov functional group interconversions allowed a rapid access to a library of 36 enantioenriched 4-aminotetrahydroquinoline derivatives featuring five points of diversity. Selected analogs were assayed for their ability to function as glucagon-like peptide-1 (GLP-1) secretagogues. After reading the article, we found that the author used 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Quality Control of 2-(Bromomethyl)pyridine hydrobromide)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridine is widely used in the precursor to agrochemicals and pharmaceuticals. Also, it is used as an important reagent and organic solvent.Quality Control of 2-(Bromomethyl)pyridine hydrobromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Cauley, Anthony N.; Ramirez, Antonio; Barhate, Chandan L.; Donnell, Andrew F.; Khandelwal, Purnima; Sezen-Edmonds, Melda; Sherwood, Trevor C.; Sloane, Jack L.; Cavallaro, Cullen L.; Simmons, Eric M. published an article in Organic Letters. The title of the article was 《Ni/Photoredox-Catalyzed C(sp2)-C(sp3) Cross-Coupling of Alkyl Pinacolboronates and (Hetero)Aryl Bromides》.HPLC of Formula: 3510-66-5 The author mentioned the following in the article:

Utilizing quinoline as a mild, catalytic additive, broadly applicable conditions for the Ni/photoredox-catalyzed C(sp2)-C(sp3) cross-coupling of (hetero)aryl bromides RBr (R = N-bocpiperidin-4-yl, N-bocindol-5-yl) and alkyl pinacolboronate esters R1R2CH(Bpin) [R1 = H, Me; R2 = Me, Ph, 2-methylphenyl, pyridin-3-yl, pyrimidin-5-yl, etc.; R1R2 = -(CH2)3-, -(CH2)5-, -(CH2)3O(CH2)2-, etc.] were developed, which can be applied to both batch and flow reactions. In addition to primary benzylic nucleophiles, both stabilized and non-stabilized secondary alkyl boronic esters are effective coupling partners. D. functional theory calculations suggest that alkyl radical generation occurs from an alkyl-B(pin)-quinoline complex, which may proceed via an energy transfer process. In the part of experimental materials, we found many familiar compounds, such as 2-Bromo-5-methylpyridine(cas: 3510-66-5HPLC of Formula: 3510-66-5)

2-Bromo-5-methylpyridine(cas: 3510-66-5) belongs to pyridine. Pyridine’s structure is isoelectronic with that of benzene, but its properties are quite different. Pyridine is completely miscible with water, whereas benzene is only slightly soluble. Like all hydrocarbons, benzene is neutral (in the acid–base sense), but because of its nitrogen atom, pyridine is a weak base.HPLC of Formula: 3510-66-5

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Gallant, Sarah K.; Tipker, Ryan M.; Glueck, David S. published an article in Organometallics. The title of the article was 《Copper-Catalyzed Asymmetric Alkylation of Secondary Phosphines via Rapid Pyramidal Inversion in P-Stereogenic Cu-Phosphido Intermediates》.Quality Control of 2-(Bromomethyl)pyridine hydrobromide The author mentioned the following in the article:

Development of metal-catalyzed asym. synthesis of P-stereogenic phosphines was guided by the hypothesis that pyramidal inversion occurs rapidly in metal-phosphido intermediates, but this process was not observed directly for all metals of interest. The authors report an enantioselective Cu(Josiphos)-catalyzed alkylation of secondary phosphines and observation of the reaction intermediates, including variable temperature NMR studies of low-barrier pyramidal inversion at P in the key P-stereogenic terminal phosphido complexes Cu(diphos*)(PRR’), and a study of their reversible formation from secondary phosphine-silanolate complexes Cu(diphos*)[PHR(R’)](OSiMe3). The experimental process involved the reaction of 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Quality Control of 2-(Bromomethyl)pyridine hydrobromide)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridines are often used as catalysts or reagents; particular notice has been paid recently to how pyridine coordinates to metal centers enabling a wide range of valuable reactions. Quality Control of 2-(Bromomethyl)pyridine hydrobromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Chen, Feng-Gui; Xu, Wei; Chen, Jing; Xiao, Hong-Ping; Wang, Hai-Ying; Chen, Zhongyan; Ge, Jing-Yuan published an article in Inorganic Chemistry. The title of the article was 《Dysprosium(III) Metal-Organic Framework Demonstrating Ratiometric Luminescent Detection of pH, Magnetism, and Proton Conduction》.SDS of cas: 1134-35-6 The author mentioned the following in the article:

A multifunctional metal-organic framework, (Hdmbpy)[Dy(H2dobdc)2(H2O)]·3H2O (Dy-MOF, H4dobdc = 2,5-dihydroxyterephthalic acid, dmbpy = 4,4′-dimethyl-2,2′-bipyridine), was synthesized and structurally characterized. The metal center DyIII is connected by four carboxyl groups to form the [Dy2(CO2)4] binuclear nodes, which are further interconnected by eight sep. H2dobdc2- ligands to form a three-dimensional (3D) framework including hydrophilic triangular channels and abundant hydrogen-bonding networks. Dy-MOF has good stability in aqueous solution as well as in harsh acidic or alk. solutions (pH range: 2.0-12.0). Furthermore, the luminescence signal of Dy-MOF undergoes a visualized color change as the acidity of the solution alters, which is the typical behavior of pH ratiometric probe. At a 100% relative humidity, Dy-MOF exhibits a high proton conductivity σ (1.70 x 10-4 S cm-1 at 303 K; 1.20 x 10-3 S cm-1 at 343 K) based on the proton hopping mechanism, which can be classified as a superionic conductor with σ exceeding 10-4 S cm-1. Addnl., the ferromagnetic interaction and magnetic relaxation behavior are simultaneously achieved in Dy-MOF. Herein, the combination of luminescence sensing, magnetism, and proton conduction in a single-phase 3D MOF may offer great potential applications in smart multitasking devices. The experimental process involved the reaction of 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6SDS of cas: 1134-35-6)

4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.SDS of cas: 1134-35-6 Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of C12H12N2In 2019 ,《Syntheses, X-Ray Crystal Structures, Emission Properties and DFT Calculations of Monoprotonated Polypyridines》 appeared in ChemistrySelect. The author of the article were Yoshikawa, Naokazu; Yamazaki, Shoko; Kato, Natsumi; Kubota, Akari; Sawai, Mika; Noda, Kaoru; Kanehisa, Nobuko; Inoue, Tsuyoshi; Nakata, Eiji; Takashima, Hiroshi. The article conveys some information:

Monoprotonated compounds [(L)HPF6] were prepared by the reaction of (L=bpy, phen, dpphen, bqn and ppy) with concentrated HCl in water. Monoprotonated pyridine rings are hydrogen bonded intramolecularly to the adjacent pyridine ring and intermolecularly to the adjacent PF6- in compounds These hydrogen bonds restrain the nonradiative decay to produce intense emission. D. functional theory was applied to interpret the planarity in compounds The attachment of one proton to the nitrogen in [(dpphen)HPF6] and [(bqn)HPF6] leads to the strong emission in acetonitrile (Φ = 0.046 and 0.097, resp.). In particular, the attachment of one proton to the ppy nitrogen results in exhibiting a strong emission with a large quantum yield (Φ = 0.264). The experimental part of the paper was very detailed, including the reaction process of 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Electric Literature of C12H12N2)

4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.Electric Literature of C12H12N2 Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Category: pyridine-derivativesIn 2021 ,《Synthesis and application of self-healing elastomers with high healing efficiency and mechical properties based on multi-healing systems》 appeared in European Polymer Journal. The author of the article were Zhou, Xing; Wang, Hao; Li, Shaonan; Liu, Mengyue. The article conveys some information:

Intrinsic self-healing materials designed by combining reversible valence bonds or ionic coordination have attracted much attention due to their ability to recover from mech. damage. However, their mech. properties tend to deteriorate due to the increased rigidity of the chain. In this work, we report a self-healing polyurethane elastomer with multiple healing systems. 3,3′-dithiodipropionic acid (TDPA) and iron ion-2,6-diaminopyridine (DAP) were used as dynamic chain extenders and ionic ligands, resp. They can be effectively unsealed at a certain temperature to ensure that the self-healing efficiency is not affected by the material formula. By changing the content of hard and soft segments, the mech. properties and self-healing properties of the material can be adjusted in a large range. When the molar ratio of TDPA and DAP is 0.5:0.5, the polyurethane based on multiple healing system only needs to be healed at 70 °C for 12 h, and the self-healing efficiency can reach 93.48%. The structural rigidity and high reversibility of metal complexing agent DAP and iron ions play an important role in enhancing mech. strength and maintaining self-healing efficiency at 70 °C. Based on the above research, we prepared the strain sensor by combining self-healing polyurethane and conductive graphene. The sensor can respond to external force quickly and stably. This work provides a feasible strategy for the preparation of mech. robust polyurethane elastomers and self-healing flexible stress sensors with high self-healing efficiency at 70 °C. In the experiment, the researchers used 2,6-Diaminopyridine(cas: 141-86-6Category: pyridine-derivatives)

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.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application In Synthesis of Bis(pyridin-2-ylmethyl)amineIn 2020 ,《A cyclometalated trinuclear Ir(III)/Pt(II) complex as a luminescent probe for histidine-rich proteins》 appeared in Dalton Transactions. The author of the article were Sarkar, Ankita; Kumar, Ravi; Das, Bishnu; Ray, Partho Sarothi; Gupta, Parna. The article conveys some information:

Organometallic complexes have important application in the field of protein staining, with potential for use in proteomic anal. The rational synthesis of a trinuclear luminescent organometallic complex with two platinum(II) centers appended to the cyclometalated ligand of the iridium(III) center is reported here. Two di-2-picolylamine groups bonded to the cyclometalated Ph pyridine moiety provide three coordinating sites to each platinum center. The replacement of chloride in the fourth coordination site of two square planar platinum metal centers with the imidazole nitrogen or sulfur atom of histidine/cysteine is evident from the change in luminescence intensity upon binding these amino acids. The increase in luminescence emission intensity upon binding of histidine to the organometallic complex allowed it to be used as a protein staining agent. Reversibility of staining upon washing with imidazole enhances the possibility of its application in mass spectrometric anal. The experimental process involved the reaction of Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Application In Synthesis of Bis(pyridin-2-ylmethyl)amine)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. The compound is a tridentate ligand in coordination chemistry and commonly used to produce Zn-based chemosensors/probes, such as Zinpry.Application In Synthesis of Bis(pyridin-2-ylmethyl)amine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthetic Route of C5H3Br2NIn 2021 ,《Electronic and geometric structure effects on one-electron oxidation of first-row transition metals in the same ligand framework》 appeared in Dalton Transactions. The author of the article were Boniolo, Manuel; Chernev, Petko; Cheah, Mun Hon; Heizmann, Philipp A.; Huang, Ping; Shylin, Sergii I.; Salhi, Nessima; Hossain, Kamal Md; Gupta, Arvind K.; Messinger, Johannes; Thapper, Anders; Lundberg, Marcus. The article conveys some information:

Developing new transition metal catalysts requires understanding of how both metal and ligand properties determine reactivity. Since metal complexes bearing ligands of the Py5 family (2,6-bis-[(2-pyridyl)methyl]pyridine) were employed in many fields in the past 20 years, authors set out here to understand their redox properties by studying a series of base metal ions (M = Mn, Fe, Co, and Ni) within the Py5OH (pyridine-2,6-diylbis[di-(pyridin-2-yl)methanol]) variant. Both reduced (MII) and the one-electron oxidized (MIII) species were carefully characterized using a combination of x-ray crystallog., x-ray absorption spectroscopy, cyclic voltammetry, and d.-functional theory calculations The observed metal-ligand interactions and electrochem. properties do not always follow consistent trends along the periodic table. this observation cannot be explained by only considering orbital and geometric relaxation, and spin multiplicity changes needed to be included into the DFT calculations to reproduce and understand these trends. In addition, exchange reactions of the sixth ligand coordinated to the metal, were analyzed. Finally, by including published data of the extensively characterized Py5OMe (pyridine-2,6-diylbis[di-(pyridin-2-yl)methoxymethane])complexes, the special characteristics of the less common Py5OH ligand were extracted This comparison highlights the non-innocent effect of the distal OH functionalization on the geometry, and consequently on the electronic structure of the metal complexes. Together, this gives a complete anal. of metal and ligand degrees of freedom for these base metal complexes, while also providing general insights into how to control electrochem. processes of transition metal complexes. The experimental part of the paper was very detailed, including the reaction process of 2,6-Dibromopyridine(cas: 626-05-1Synthetic Route of C5H3Br2N)

2,6-Dibromopyridine(cas: 626-05-1) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.Synthetic Route of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Name: 4-CyanopyridineIn 2019 ,《The reductive C3 functionalization of pyridinium and quinolinium salts through iridium-catalysed interrupted transfer hydrogenation》 appeared in Nature Chemistry. The author of the article were Grozavu, Alexandru; Hepburn, Hamish B.; Smith, Philip J.; Potukuchi, Harish K.; Lindsay-Scott, Peter J.; Donohoe, Timothy J.. The article conveys some information:

Aromatic rings are ubiquitous in organic chem. and form the basis of many com. products. Despite the numerous routes available for the preparation of aromatic compounds, there remain few methods that allow their conversion into synthetically useful partially saturated derivatives and even fewer that allow new C-C bonds to be formed at the same time. Here we set out to address this problem and uncover a unique catalytic partial reduction reaction that forms partially saturated azaheterocycles from aromatic precursors. In this reaction, methanol and formaldehyde are used for the reductive functionalization of pyridines and quinolines using catalytic iridium; thus, inexpensive and renewable feedstocks are utilized in the formation of complex N-heterocycles. By harnessing the formation of a nucleophilic enamine intermediate, the C-C bond-forming process reverses the normal pattern of reactivity and allows access to the C3 position of the arene. Mechanistic investigations using D-labeling experiments reveal the source of hydride added to the ring and show the reversible nature of the iridium-hydride addition4-Cyanopyridine(cas: 100-48-1Name: 4-Cyanopyridine) was used in this study.

4-Cyanopyridine(cas: 100-48-1) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.Name: 4-Cyanopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Safety of 2-BromonicotinaldehydeIn 2019 ,《Ligand Structure Effects on Molecular Assembly and Magnetic Properties of Copper(II) Complexes with 3-Pyridyl-Substituted Nitronyl Nitroxide Derivatives》 appeared in ACS Omega. The author of the article were Sherstobitova, Tatiana; Maryunina, Kseniya; Tolstikov, Svyatoslav; Letyagin, Gleb; Romanenko, Galina; Nishihara, Sadafumi; Inoue, Katsuya. The article conveys some information:

Reaction of Cu(hfac)2 with methyl- and bromo-3-pyridyl-substituted nitronyl nitroxides (LR) leads to assemble a diverse set of coordination complexes: mononuclear [Cu(hfac)2L2-Me], binuclear [{Cu(hfac)2}2(H2O)L2-Me], trinuclear [{Cu(hfac)2}3(L6-Br)2], pentanuclear [{Cu(hfac)2}5(L2-Me)2], and [{Cu(hfac)2}5(L2-Me)4], cocrystals [Cu(hfac)2(L2-Br)2]·[Cu(hfac)2(H2O)2] and [Cu(hfac)2(L2-Br)2]·2[Cu(hfac)2H2O], one-dimensional polymers [Cu(hfac)2L2-Br]n and [Cu(hfac)2L6-Br]n, and cyclic dimers [Cu(hfac)2L5-Me]2, [Cu(hfac)2L5-Br]2, and [Cu(hfac)2L6-Me]2. The mol. structures of the obtained complexes are strongly affected by the substituent type and its location in the pyridine heterocycle. Occupation of the second position of the pyridine ring increases the steric hindrance of both imine and nitroxide coordination sites of L2-R, which is favorable for the formation of various conformers and precipitation of complexes with different mol. structures. The pentanuclear [{Cu(hfac)2}5(L2-Me)2] and [{Cu(hfac)2}5(L2-Me)4] complexes do not have prior analogs and are valuable model objects for investigation of the mechanism of formation of various coordination polymers. The arrangement of long Cu-ONO bonds in {CuO6} square bipyramids due to the weakening nitroxide donor site in complexes, based on L2-Me, L2-Br, and L6-Br ligands, results in ferromagnetic exchange interactions between spins of Cu2+ ions and nitroxides. Complexes with substituents that do not considerably affect the coordination ability of ligands (L5-Me, L5-Br, and L6-Me) exhibit strong antiferromagnetic exchange interactions between spins of Cu2+ ions and nitroxides. The experimental part of the paper was very detailed, including the reaction process of 2-Bromonicotinaldehyde(cas: 128071-75-0Safety of 2-Bromonicotinaldehyde)

2-Bromonicotinaldehyde(cas: 128071-75-0) belongs to pyridine. Pyridine and pyridine-derived structures are privileged pharmacophores in medicinal chemistry and an essential functionality for organic chemists. As the prototypical π-deficient heterocycle, pyridine illustrates distinctive chemistry as both substrate and reagent. Safety of 2-Bromonicotinaldehyde

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem