Category: pyridine-derivatives

Multifunctional Reactive MALDI Matrix Enabling High-Lateral Resolution Dual Polarity MS Imaging and Lipid C=C Position-Resolved MS² Imaging was written by Waeldchen, Fabian;Mohr, Franziska;Wagner, Andreas H.;Heiles, Sven. And the article was included in Analytical Chemistry (Washington, DC, United States) in 2020.Product Details of 91-02-1 This article mentions the following:

Local lipid variations in tissues are readily revealed with mass spectrometry imaging (MSI) methods, and the resulting lipid distributions serve as bioanal. signatures to reveal cell- or tissue-specific lipids. Comprehensive MSI lipid mapping requires measurements in both ion polarities. Addnl., structural lipid characterization is necessary to link the lipid structure to lipid function. Whereas some structural elements of lipids are readily derived from high-resolution mass spectrometry (MS) and tandem-MS (MSⁿ), the localization of C=C double bonds (DBs) requires specialized fragmentation and/or functionalization methods. In this work, we identify a multifunctional matrix-assisted laser desorption/ionization (MALDI) matrix for spatially resolved lipidomics investigations that reacts with lipids in Paternó-Büchi (PB) reactions during laser irradiation facilitating DB-position assignment and allows dual-polarity high-resolution MALDI-MSI and MALDI MS²I studies. By screening 12 compounds for improved ionization efficiency in pos.-/neg.-ion mode and the functionalization yield compared to the previously introduced reactive MALDI matrix benzophenone, 2-benzoylpyridine (BzPy) is identified as the best candidate. The new matrix enables DB localization of authentic standards belonging to 12 lipid classes and helps to assign 133/58 lipid features in pos.-/neg.-ion mode from mouse cerebellum tissue. The anal. capabilities of BzPy as a multifunctional MALDI-MSI matrix are demonstrated by imaging endogenous and PB-functionalized lipids in mouse kidney sections with 7μm lateral resolution in both ion modes. Tracking diagnostic lipid DB-position fragment ions in mouse pancreatic tissue with down to 10μm pixel size allows us to identify the islets of Langerhans associated with lipid isomer upregulation and depletion. In the experiment, the researchers used many compounds, for example, Phenyl(pyridin-2-yl)methanone (cas: 91-02-1Product Details of 91-02-1).

Phenyl(pyridin-2-yl)methanone (cas: 91-02-1) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Product Details of 91-02-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

A facile synthesis of 2-chloro-1,8-naphthyridine-3-carbaldehyde; their transformation into different functionalities and antimicrobial activity was written by Kumar, M. Ranadheer;Laxminarayana, E.;Ramesh, D.;Sreenivasulu, B.;Chary, M. Thirumala. And the article was included in International Journal of Chemical Sciences in 2010.COA of Formula: C7H9N3O This article mentions the following:

2-Chloro-1,8-naphthyridine-3-carbaldehydes (I) were synthesized through Vilsmeier-Haack cyclization treating N-(pyridin-2-yl)acetamides with POCl₃ in DMF. The cyclization was facilitated by N-(pyridin-2-yl)acetamides bearing electron-donating groups at meta position. Condensation of I with N₂H₄.H₂O and NaOAc in MeOH gave the corresponding hydrazones. Treatment of I with NaN₃ in EtOH led to cyclization to afford tetrazolo[1,5-a](1,8)naphthyridine-4-carbaldehydes via unstable 2-azido compounds Reaction of I with Na₂S in DMF yielded 2-mercapto-1,8-naphthyridine-3-carbaldehydes. The synthesized new compounds were screened for antimicrobial activity. In the experiment, the researchers used many compounds, for example, N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3COA of Formula: C7H9N3O).

N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of âˆ?8.7 × 10âˆ? cm3·molâˆ?.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·molâˆ? in the liquid phase and 140.4 kJ·molâˆ? in the gas phase. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. COA of Formula: C7H9N3O

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Deformative Transition of the Menschutkin Reaction and Helical Atropisomers in a Congested Polyheterocyclic System was written by Chang, Yung-Yu;Ho, Tse-Lok;Chung, Wen-Sheng. And the article was included in Journal of Organic Chemistry in 2014.Application In Synthesis of 2-Isopropylpyridine This article mentions the following:

A 4,7-phenanthroline polycyclic 1A designed for probing the limits of the Menschutkin reaction was synthesized in a six-step sequence. The rotational barrier of the Ph ring nearby the N-Me group in rac-2A is â‰?8.1 kcal/mol from VT-NMR experiments, making them a new type of helical atropisomer. The methylation rate constants of 9 and 1A with MeI is 2.22 × 10^-4 and 9.62 × 10^-6 s^-1 mol^-1 L, resp.; thus, the formation rate of (P/M)-2A is one of the slowest rates ever reported for a Menschutkin reaction. The N-Me protons in (P/M)-2A exhibit a significant upfield shift (Δδ 1.0 ppm) in its ¹H NMR, compared to those without a nearby Ph, indicating a strong CH-π interaction is involved. Conformational flexibility in dipyridylethene 9 is clearly shown by its complexation with BH₃ to form helical atropisomers (P,P/M,M)-10. The pK_a values of the conjugate acids of 1A and 9 in acetonitrile are 4.65 and 5.07, resp., which are much smaller compared to that of pyridine 14a (pK_a = 12.33), implying that the basicity, nucleophilicity, and amine alkylation rates of 1A and 9 are markedly decreased by the severe steric hindrance of the flanking Ph rings in the polyheterocycles. In the experiment, the researchers used many compounds, for example, 2-Isopropylpyridine (cas: 644-98-4Application In Synthesis of 2-Isopropylpyridine).

2-Isopropylpyridine (cas: 644-98-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Application In Synthesis of 2-Isopropylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Change of Silk Fibroin Molecular Mass During Dissolution in Ionic Liquids was written by Susanin, A. I.;Sashina, E. S.;Novoselov, N. P.;Zakharov, V. V.. And the article was included in Fibre Chemistry in 2020.Application In Synthesis of 1-Butyl-3-methylpyridinium Chloride This article mentions the following:

Silk fibroin is a unique protein polymer with broad potential for medical applications. Fibroin is significantly degraded and the materials obtained from it have poor mech. characteristics if silk fiber is dissolved in traditional solvents. The present work used gel electrophoresis to study the dissolution of fibroin in ionic liquids Fibroin degradation was shown to increase with increasing temperature and dissolution time. The optimal conditions for dissolution that allowed the heavy and light chains of fibroin to be preserved intact were proposed. In the experiment, the researchers used many compounds, for example, 1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3Application In Synthesis of 1-Butyl-3-methylpyridinium Chloride).

1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Application In Synthesis of 1-Butyl-3-methylpyridinium Chloride

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Tetramethylammonium Fluoride Alcohol Adducts for S_NAr Fluorination was written by Morales-Colon, Maria T.;See, Yi Yang;Lee, So Jeong;Scott, Peter J. H.;Bland, Douglas C.;Sanford, Melanie S.. And the article was included in Organic Letters in 2021.SDS of cas: 3939-12-6 This article mentions the following:

Nucleophilic aromatic fluorination (S_NAr) is among the most common methods for the formation of C(sp²)-F bonds. Despite many recent advances, a long-standing limitation of these transformations was the requirement for rigorously dry, aprotic conditions to maintain the nucleophilicity of fluoride and suppress the generation of side products. This report addresses this challenge by leveraging tetramethylammonium fluoride alc. adducts (Me₄NF·ROH) as fluoride sources for S_NAr fluorination. Through systematic tuning of the alc. substituent (R), tetramethylammonium fluoride tert-amyl alc. (Me₄NF·t-AmylOH) was identified as an inexpensive, practical, and bench-stable reagent for S_NAr fluorination under mild and convenient conditions (80°C in DMSO, without the requirement for drying of reagents or solvent). A substrate scope of more than 50 (hetero) aryl halides and nitroarene electrophiles was demonstrated. In the experiment, the researchers used many compounds, for example, 6-Fluoronicotinonitrile (cas: 3939-12-6SDS of cas: 3939-12-6).

6-Fluoronicotinonitrile (cas: 3939-12-6) 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. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.SDS of cas: 3939-12-6

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Poly(ethylene glycol) dimethyl ether mediated oxidative scission of aromatic olefins to carbonyl compounds by molecular oxygen was written by Yu, Tao;Guo, Mingqing;Wen, Simiaomiao;Zhao, Rongrong;Wang, Jinlong;Sun, Yanli;Liu, Qixing;Zhou, Haifeng. And the article was included in RSC Advances in 2021.Product Details of 91-02-1 This article mentions the following:

A simple and practical oxidative scission of aromatic olefins to carbonyl compounds R¹C(O)R₂ [R¹ = Ph, 4-MeC₆H₄, 4-FC₆H₄, etc., R² = Ph, 4-MeOC₆H₄, 4-ClC₆H₄, ect.] using O₂ as the sole oxidant with poly(ethylene glycol) di-Me ether as a benign solvent was developed. A wide range of monosubstituted, gem-disubstituted, 1,2-disubstituted, trisubstituted and tetrasubstituted aromatic olefins was successfully converted into the corresponding aldehydes and ketones in excellent yields even with gram-scale reaction. Some control experiments were also conducted to support a possible reaction pathway. In the experiment, the researchers used many compounds, for example, Phenyl(pyridin-2-yl)methanone (cas: 91-02-1Product Details of 91-02-1).

Phenyl(pyridin-2-yl)methanone (cas: 91-02-1) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Product Details of 91-02-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Anhydrous Tetramethylammonium Fluoride for Room-Temperature S_NAr Fluorination was written by Schimler, Sydonie D.;Ryan, Sarah J.;Bland, Douglas C.;Anderson, John E.;Sanford, Melanie S.. And the article was included in Journal of Organic Chemistry in 2015.Reference of 3939-12-6 This article mentions the following:

This paper describes the room-temperature S_NAr fluorination of aryl halides and nitroarenes using anhydrous tetramethylammonium fluoride (NMe₄F). This reagent effectively converts aryl-X (X = Cl, Br, I, NO₂, OTf) to aryl-F under mild conditions (often room temperature). Substrates for this reaction include electron-deficient heteroaromatics (22 examples) and arenes (5 examples). The relative rates of the reactions vary with X as well as with the structure of the substrate. However, in general, substrates bearing X = NO₂ or Br react fastest. In all cases examined, the yields of these reactions are comparable to or better than those obtained with CsF at elevated temperatures (i.e., more traditional halex fluorination conditions). The reactions also afford comparable yields on scales ranging from 100 mg to 10 g. A cost anal. is presented, which shows that fluorination with NMe₄F is generally more cost-effective than fluorination with CsF. In the experiment, the researchers used many compounds, for example, 6-Fluoronicotinonitrile (cas: 3939-12-6Reference of 3939-12-6).

6-Fluoronicotinonitrile (cas: 3939-12-6) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Reference of 3939-12-6

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthesis, structure and luminescent properties of Cu(I)-cyanide frameworks based on bent dipyridyl-oxadiazole ligands was written by Wang, Hui;Li, Ming-Xing;Shao, Min;Wang, Zhao-Xi. And the article was included in Journal of Molecular Structure in 2008.Safety of 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole This article mentions the following:

Hydrothermal reaction of CuCN with 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo) affords a wave-like infinite chain coordination polymer [Cu₂(CN)₂(3-bpo)]_n (1). Replacement of 3-bpo by its isomer 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (4-bpo) could yields polymer [Cu(CN)(4-bpo)]_n (2). The mol. structures of both complexes were determined using X-ray crystallog. In the complex 1, the bent 3-bpo ligand adopts bidentate chelating mode binds with the Cu(I)-cyanide chain to form 16-membered macrocyclic structure. The complex 2 exhibits a layered metal-organic framework, in which exo-bidentate 4-bpo ligand connects the Cu(I)-cyanide chains to form 2-D rectangle grid. Both of these Cu(I) complexes are thermal stable under 200 °C and release 3-bpo or 4-bpo ligand in 200-360 °C. Luminescent study reveals that 1 has green-light emission, while 2 has blue-light emission. In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7Safety of 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole).

2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Safety of 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ruthenium(II)-Catalyzed C-H Acyloxylation of Phenols with Removable Auxiliary was written by Raghuvanshi, Keshav;Rauch, Karsten;Ackermann, Lutz. And the article was included in Chemistry – A European Journal in 2015.Product Details of 4783-68-0 This article mentions the following:

Intermol. C-H acyloxylations of phenols with removable directing groups were accomplished with a versatile ruthenium catalyst. Specifically, a cationic ruthenium(II) complex, formed in-situ, enabled the chemoselective C-H oxygenations of a broad range of substrates. The catalyst proved tolerant of synthetically valuable functional groups, and the substrate scope included both (hetero)aromatic and, the more challenging, aliphatic carboxylic acids. The proposed reaction mechanism involved a reversible C-H ruthenation and an oxidatively induced C-O-bond-forming reductive elimination. In the experiment, the researchers used many compounds, for example, 2-Phenoxypyridine (cas: 4783-68-0Product Details of 4783-68-0).

2-Phenoxypyridine (cas: 4783-68-0) belongs to pyridine derivatives. Pyridine’s the lone pair does not contribute to the aromatic system but importantly influences the chemical properties of pyridine, as it easily supports bond formation via an electrophilic attack. One of the examples of pyridines is the well-known alkaloid lithoprimidine, which is an A3 adenosine receptor antagonist and N,N-dimethylaminopyridine (DMAP) analog, commonly used in organic synthesis.Product Details of 4783-68-0

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

[M(L)₂(NCS)₂(H₂O)₂] (M = Mn^II or Co^II and L = 2,5-bis(4-pyridyl)-1,3,4-oxadiazole): three-dimensional extended networks built from hydrogen bonds and π-π stacking interaction-syntheses and crystal structures was written by Fang, Ya-Yin;Liu, He;Du, Miao;Guo, Ya-Mei;Bu, Xian-He. And the article was included in Journal of Molecular Structure in 2002.SDS of cas: 15420-02-7 This article mentions the following:

Two three-dimensional (3D) supramol. compounds [M(L)₂(NCS)₂(H₂O)₂] (M = Mn or Co; L = 2,5-bis(4-pyridyl)-1,3,4-oxadiazole) were synthesized and structurally determined by x-ray diffraction analyses. The crystal structures of both complexes reveal that they are isomorphic neutral mols. and the metal ions are at the center of symmetry. Each metal center is six-coordinated and the MN₄O₂ coordination sphere can be considered as an octahedron. The most striking feature of both complexes resides in the formation of a 3-dimensional network through the mutual effect of H bonds and π-π stacking. In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7SDS of cas: 15420-02-7).

2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of âˆ?8.7 × 10âˆ? cm3·molâˆ?.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·molâˆ? in the liquid phase and 140.4 kJ·molâˆ? in the gas phase. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.SDS of cas: 15420-02-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem