Category: pyridine-derivatives

In 2016,Chapman, Michael R.; Kwan, Maria H. T.; King, Georgina E.; Kyffin, Benjamin A.; Blacker, A. John; Willans, Charlotte E.; Nguyen, Bao N. published 《Rapid, metal-free and aqueous synthesis of imidazo[1,2-a]pyridine under ambient conditions》.Green Chemistry published the findings.Category: pyridine-derivatives The information in the text is summarized as follows:

A novel, rapid and efficient route to imidazo[1,2-a]pyridines I [R = H, 7-CH3, 6-NO2, etc.] under ambient, aqueous and metal-free conditions was reported. The NaOH-promoted cycloisomerization of N-propargylpyridiniums gave quant. yield in a few minutes (10 g scale). A comparison of common green metrics to current routes showed clear improvements, with at least a one order of magnitude increase in space-time-yield. The experimental part of the paper was very detailed, including the reaction process of 2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8Category: pyridine-derivatives)

2-(Bromomethyl)pyridine hydrobromide(cas: 31106-82-8) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2014,Sharma, Sanjeev; Kim, Hyungjun; Lee, Young Hoon; Kim, Taewon; Lee, Yoon Sup; Lee, Min Hyung published 《Heteroleptic Cyclometalated Iridium(III) Complexes Supported by Triarylborylpicolinate Ligand: Ratiometric Turn-On Phosphorescence Response upon Fluoride Binding》.Inorganic Chemistry published the findings.Synthetic Route of C7H6BrNO2 The information in the text is summarized as follows:

Heteroleptic cyclometalated iridium(III) complexes (CN̂)2Ir(Bpic) (4-6) (CN̂ = dfppy (4), ppy (5), btp (6)) supported by triarylborylpicolinate (Bpic) ancillary ligand were synthesized and characterized. X-ray diffraction (XRD) study of 5 confirmed NÔ chelation of the Bpic ligand to the iridium center forming an (CN̂)2Ir-borane conjugate. While the UV/vis absorption bands of 4-6 remained almost unchanged in the low-energy region upon fluoride addition, a ratiometric turn-on phosphorescence response was observed for 4 and 5. In contrast, the phosphorescence of 6 was little affected by fluoride binding. Exptl. and theor. studies suggest that the LUMO in neutral 4 and 5 is dominated by the Bpic ligand, which makes the weakly emissive 3ML’CT/3LL’CT (L = CN̂; L’ = Bpic) states as the lowest-energy triplet excited state, while the fluoride binding to 4 and 5 induces the highly emissive 3MLCT/3ππ* states centered on the (CN̂)2Ir moiety. Thermally induced conversion from the 3MLCT/3ππ* to the 3ML’CT/3LL’CT states is suggested to be responsible for the low-energy weak phosphorescence in 4 and 5. In addition to this study using Methyl 5-bromopicolinate, there are many other studies that have used Methyl 5-bromopicolinate(cas: 29682-15-3Synthetic Route of C7H6BrNO2) was used in this study.

Methyl 5-bromopicolinate(cas: 29682-15-3) belongs to pyridine. Pyridine derivatives lend themselves to many roles in the spirited field of supramolecular chemistry – whether as the ligand backbone of metal-organic polymers or presiding over the key electronic stations of nanodevices. In biochemistry, pyridine-containing cofactors are necessary nutrients on which our lives depend. Synthetic Route of C7H6BrNO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2013,Konze, Kyle D.; Ma, Anqi; Li, Fengling; Barsyte-Lovejoy, Dalia; Parton, Trevor; MacNevin, Christopher J.; Liu, Feng; Gao, Cen; Huang, Xi-Ping; Kuznetsova, Ekaterina; Rougie, Marie; Jiang, Alice; Pattenden, Samantha G.; Norris, Jacqueline L.; James, Lindsey I.; Roth, Bryan L.; Brown, Peter J.; Frye, Stephen V.; Arrowsmith, Cheryl H.; Hahn, Klaus M.; Wang, Gang Greg; Vedadi, Masoud; Jin, Jian published 《An Orally Bioavailable Chemical Probe of the Lysine Methyltransferases EZH2 and EZH1》.ACS Chemical Biology published the findings.Category: pyridine-derivatives The information in the text is summarized as follows:

EZH2 or EZH1 is the catalytic subunit of the polycomb repressive complex 2 that catalyzes methylation of histone H3 lysine 27 (H3K27). The trimethylation of H3K27 (H3K27me3) is a transcriptionally repressive post-translational modification. Overexpression of EZH2 and hypertrimethylation of H3K27 have been implicated in a number of cancers. Several selective inhibitors of EZH2 have been reported recently. Herein we disclose UNC1999, the first orally bioavailable inhibitor that has high in vitro potency for wild-type and mutant EZH2 as well as EZH1, a closely related H3K27 methyltransferase that shares 96% sequence identity with EZH2 in their resp. catalytic domains. UNC1999 was highly selective for EZH2 and EZH1 over a broad range of epigenetic and non-epigenetic targets, competitive with the cofactor SAM and non-competitive with the peptide substrate. This inhibitor potently reduced H3K27me3 levels in cells and selectively killed diffused large B cell lymphoma cell lines harboring the EZH2Y641N mutant. Importantly, UNC1999 was orally bioavailable in mice, making this inhibitor a valuable tool for investigating the role of EZH2 and EZH1 in chronic animal studies. We also designed and synthesized UNC2400, a close analog of UNC1999 with potency >1,000-fold lower than that of UNC1999 as a neg. control for cell-based studies. Finally, we created a biotin-tagged UNC1999 (UNC2399), which enriched EZH2 in pull-down studies, and a UNC1999-dye conjugate (UNC2239) for co-localization studies with EZH2 in live cells. Taken together, these compounds represent a set of useful tools for the biomedical community to investigate the role of EZH2 and EZH1 in health and disease. In the experiment, the researchers used 5-Bromo-2-chloropyridine(cas: 53939-30-3Category: pyridine-derivatives)

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2013,Oberli, Matthias A.; Buchwald, Stephen L. published 《A General Method for Suzuki-Miyaura Coupling Reactions Using Lithium Triisopropyl Borates [Erratum to document cited in CA157:409485]》.Organic Letters published the findings.Electric Literature of C5H5BrN2 The information in the text is summarized as follows:

An NIH grant acknowledgment was omitted from the published article; the omitted acknowledgment is given. In the experiment, the researchers used many compounds, for example, 6-Bromopyridin-3-amine(cas: 13534-97-9Electric Literature of C5H5BrN2)

6-Bromopyridin-3-amine(cas: 13534-97-9) belongs to anime. The methylamines occur in small amounts in some plants. Many polyfunctional amines (i.e., those having other functional groups in the molecule) occur as alkaloids in plants—for example, mescaline, 2-(3,4,5-trimethoxyphenyl)ethylamine; the cyclic amines nicotine, atropine, morphine, and cocaine; and the quaternary salt choline, N-(2-hydroxyethyl)trimethylammonium chloride, which is present in nerve synapses and in plant and animal cells.Electric Literature of C5H5BrN2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2013,Sharma, Sushila; Kumar, Manoranjan; Kumar, Vishal; Kumar, Neeraj published 《Vasicine catalyzed direct C-H arylation of unactivated arenes: organocatalytic application of an abundant alkaloid》.Tetrahedron Letters published the findings.Application of 13534-97-9 The information in the text is summarized as follows:

Vasicine, a quinazoline alkaloid isolated from Adhatoda vasica, has been employed as an organocatalyst for direct C-H arylation of unactivated arenes with aryl iodides/bromides without the assistance of any transition metal catalyst. A number of sensitive functional groups such as Me, methoxy, O-benzyl, acetyl, and amino were well tolerated under present reaction conditions. Mechanistic investigation supported the involvement of radical intermediates.6-Bromopyridin-3-amine(cas: 13534-97-9Application of 13534-97-9) was used in this study.

6-Bromopyridin-3-amine(cas: 13534-97-9) belongs to anime. To avoid the problem of multiple alkylation, methods have been devised for “blocking” substitution so that only one alkyl group is introduced. The Gabriel synthesis is one such method; it utilizes phthalimide, C6H4(CO)2NH, whose one acidic hydrogen atom has been removed upon the addition of a base such as KOH to form a salt.Application of 13534-97-9

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2009,Butcher, Ken J.; Hurst, Jenny published 《Aromatic amines as nucleophiles in the Bargellini reaction》.Tetrahedron Letters published the findings.Related Products of 13534-97-9 The information in the text is summarized as follows:

Aromatic amines can be employed in the Bargellini condensation with piperidinone and CHCl3 in the presence of NaOH to generate useful intermediates. Rapid, practical access to functionalized, privileged structures may have utility in the synthesis of drug-like mols. An improved synthesis of carfentanil analogs illustrates this point. In the experiment, the researchers used many compounds, for example, 6-Bromopyridin-3-amine(cas: 13534-97-9Related Products of 13534-97-9)

6-Bromopyridin-3-amine(cas: 13534-97-9) belongs to anime. Amine, any member of a family of nitrogen-containing organic compounds that is derived, either in principle or in practice, from ammonia (NH3). Naturally occurring amines include the alkaloids, which are present in certain plants; the catecholamine neurotransmitters (i.e., dopamine, epinephrine, and norepinephrine); and a local chemical mediator, histamine, that occurs in most animal tissues.Related Products of 13534-97-9

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zurwerra, Didier; Quetglas, Vincent; Kloer, Daniel P.; Renold, Peter; Pitterna, Thomas published an article in Organic Letters. The title of the article was 《Synthesis and Stability of Boratriazaroles》.Synthetic Route of C6H7BClNO2 The author mentioned the following in the article:

We describe the synthesis and stability anal. of novel boratriazaroles that can be viewed as bioisosteres of imidazoles or pyrazoles. These heterocycles could conveniently be obtained by condensing a boronic acid and amidrazone 1 in various solvents. A detailed stability anal. of selected compounds at different pH values as a function of time led to the identification of steric hindrance around the boron atom as a key element for stabilization. In addition to this study using (6-Chloro-5-methylpyridin-3-yl)boronic acid, there are many other studies that have used (6-Chloro-5-methylpyridin-3-yl)boronic acid(cas: 1003043-40-0Synthetic Route of C6H7BClNO2) was used in this study.

(6-Chloro-5-methylpyridin-3-yl)boronic acid(cas: 1003043-40-0) belongs to pyridine. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. As ligands, solvents, and catalysts they facilitate reactions; thus descriptions of these new ligands and their applications abound each year.Synthetic Route of C6H7BClNO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

The author of 《Hydrogen bond-induced abrupt spin crossover behaviour in 1-D cobalt(II) complexes – the key role of solvate water molecules》 were Zenno, Hikaru; Kobayashi, Fumiya; Nakamura, Masaaki; Sekine, Yoshihiro; Lindoy, Leonard F.; Hayami, Shinya. And the article was published in Dalton Transactions in 2021. Reference of 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine The author mentioned the following in the article:

The magnetic properties and structural aspects of the 1-D cobalt(II) complexes, [Co(pyterpy)Cl2]·2H2O (1·2H2O; pyterpy = 4′-(4”’-pyridyl)-2,2′:6′,2”-terpyridine) and [Co(pyethyterpy)Cl2]·2H2O (2·2H2O; pyethyterpy = 4′-((4”’-pyridyl)ethynyl)-2,2′:6′,2”-terpyridine) are reported. In each complex the central cobalt(II) ion displays an octahedral coordination environment composed of three nitrogen donors from the terpyridine moiety, a nitrogen donor from a pyridyl group and two chloride ligands which occupy the axial sites. 1·2H2O exhibits abrupt spin-crossover (SCO) behavior (T1/2↓ = 218 K; T1/2↑ = 227 K) along with a thermal hysteresis loop, while 2·2H2O and the dehydrated species 1 and 2 exhibit high-spin (HS) states at 2-300 K as well as field-induced single-mol. magnet (SMM) behavior attributed to the presence of magnetic anisotropic HS cobalt(II) species (S = 3/2). 1·2H2O exhibited reversible desorption/resorption of its two water mols., revealing reversible switching between SCO and SMM behavior triggered by the dehydration/rehydration processes. Single crystal x-ray structural analyses revealed that 1·2H2O crystalizes in the orthorhombic space group Pcca while 2 and 2·2H2O crystallize in the monoclinic space group P2/n. Each of the 1-D chains formed by 1·2H2O in the solid state are bridged by hydrogen bonds between water mols. and chloride groups to form a 2-D layered structure. The water mols. bridging 1-D chains in 1·2H2O interact with the chloride ligands occupying the axial positions, complementing the effect of Jahn-Teller distortion and contributing to the abrupt SCO behavior and associated stabilization of the LS state. In the experiment, the researchers used many compounds, for example, 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3Reference of 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine)

4′-(4-Pyridyl)-2,2′:6′,2”-terpyridine(cas: 112881-51-3) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. Reference of 4′-(4-Pyridyl)-2,2′:6′,2”-terpyridineThe lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Formula: C5H3Br2NIn 2021 ,《Stimuli-responsive cyclometalated platinum complex bearing bent molecular geometry for highly efficient solution-processable OLEDs》 was published in Chinese Chemical Letters. The article was written by Wei, Zhenhua; Zhang, Kai; Kim, Chan Kyung; Tan, Shuai; Wang, Shaojie; Wang, Lin; Li, Jun; Wang, Yafei. The article contains the following contents:

Smart materials, such as stimuli-responsive luminescence, have attracted much attentions due to their potential application in semiconductor filed. In this context, Pt complexes of (dfppy-DC)Pt(acac) and (dfppy-O-DC)Pt(acac) were prepared and characterized, in which (2-(4′,6′-difluorophenyl)pyridinato-N,C2′)(2,4-pentanedionato-O,O)Pt(II) was used as the planar emission core and 9-(4-(phenylsulfonyl)phenyl)-9H-carbazole (d.c.) was regard as the bent pendent. Both Pt complexes showed bright emission in solution and solid state, concomitant with charming external-stimuli-responsive emission under mech. grinding, organic solvent vapors and pressure. The change emission color spanned from yellow to near-IR region. Using the Pt complexes as the dopant, solution processable organic light-emitting diodes (OLEDs) were fabricated and a maximum external quantum efficiency of -18% was achieved, which is the highest value among the reported solution-processable OLEDs based on external-stimuli-responsive luminescence. This research demonstrated that Pt complex can show promising stimuli responsive emission via ingenious mol. design, indicating a novel way for developing the smart materials in semiconductor filed. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromopyridine(cas: 624-28-2Formula: C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Formula: C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Category: pyridine-derivativesIn 2021 ,《Covalent immobilization of ruthenium polypyridyl complex on multi-walled carbon nanotube supports for oxygen evolution reaction in an alkaline solution》 was published in Journal of Power Sources. The article was written by Wu, Zhen-Yi; Zhang, Qian-Xin; Huang, Li-Jing; Xu, Yu-Jin; Tang, Ding-Liang. The article contains the following contents:

Electrocatalytic water splitting to realize the sustainable production of hydrogen is one of the key ways to gain renewable clean energy. The development of the ruthenium-terpyridine-bipyridine (bpyRutpy) complexes used as efficient homogeneous water oxidation catalysts is one of the currently hot research fields. All catalytic active sites of the homogeneous mol. catalyst are fully utilized, and show a high catalytic efficiency. However, the homogeneous mol. catalyst has some intrinsic shortages such as difficulty on separation, recovery and regeneration, and high cost. In view of this, we synthesized the multi-walled carbon nanotube (MWCNT)-based heterogeneous catalyst, MWCNT-bpyRutpy, by covalently bonding the ruthenium-based complex onto the carbon nanotubes, in order to achieve the maximum mol. catalytic efficiency of the complex. The synthesized catalyst is fully characterized by mass spectrometry, NMR spectroscopy, IR spectroscopy, UV-visible spectroscopy, photoelectron spectroscopy, Raman spectroscopy, and thermogravimetry. The formation of the nanocatalyst via fusing Ruthenium complexes to MWCNTs promotes the oxygen evolution reaction (OER) kinetics, enhances intrinsic activity, and increases the sp. surface area of electrochem. activity, and achieve excellent OER performance with a low overpotential of 436 mV at 10mAcm2, a low Tafel slope of 77.2 mV, and a relatively high turnover frequency (TOF) of 0.5833 s-1 at an overpotential of 400 mV. In the experiment, the researchers used 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Category: pyridine-derivatives)

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.Category: pyridine-derivatives 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