Category: pyridine-derivatives

《Copper-Catalyzed Enantioselective Three-Component Synthesis of Optically Active Propargylamines from Aldehydes, Amines, and Aliphatic Alkynes》 was published in Chemistry – A European Journal in 2010. These research results belong to Nakamura, Shuichi; Ohara, Mutsuyo; Nakamura, Yuko; Shibata, Norio; Toru, Takeshi. COA of Formula: C35H27N3O2 The article mentions the following:

An enantioselective three-component reaction of aldehydes, amines, and aliphatic alkynes catalyzed by C2-sym. pybim Cu1 catalysts to give propargylamines, e.g., I in good yields and with high enantioselectivity has been developed. This process has many advantages, such as simplified operation and mild reaction conditions. These results open a novel way to synthesize optically active propargylamines. In the experiment, the researchers used many compounds, for example, 2,6-Bis((4S,5S)-4,5-diphenyl-4,5-dihydrooxazol-2-yl)pyridine(cas: 410092-98-7COA of Formula: C35H27N3O2)

2,6-Bis((4S,5S)-4,5-diphenyl-4,5-dihydrooxazol-2-yl)pyridine(cas: 410092-98-7) 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. COA of Formula: C35H27N3O2The 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

Application In Synthesis of 2-BromonicotinaldehydeIn 2020 ,《Elemental Sulfur-Promoted [2+3+1] Annulation for Synthesis of Functionalized Thiochromeno[2,3-b]indoles from Indole Derivatives》 was published in Asian Journal of Organic Chemistry. The article was written by Liu, Jianming; Wang, Zhixian; Wang, Ke; Liu, Dong; Yang, Yan; Fan, Junjun; Zhuo, Kelei; Yue, Yuanyuan. The article contains the following contents:

An intermol. [2+3+1] annulation between indoles I (R1 = H, Me, OMe, Cl, Br; R2 = H, Me, F, OMe, Cl, Br; R3 = H, Me, Cl, F; R4 = H, OMe, Br, Cl) and aromatic aldehyde derivatives 2-Br-3-R5-4-R6-5-R7C6HCHO (R5 = H; R6 = H, Me; R7 = H, F, CF3; R5R6 = -CH=CH-CH=CH-) and 2-bromonicotinaldehyde was successfully achieved by utilizing elemental sulfur as the promoter and coupling partner. This direct and operationally simple procedure provided a rapid and reliable approach to synthesize functionalized thiochromeno[2,3-b]indoles II and pyrido[3′, 2′:5,6]thiopyrano[2, 3-b]indoles III. Preliminary mechanistic studies indicated that elemental sulfur enhanced the nucleophilicity of the 3-position of indole to attack an aldehyde group, and C-H cleavage of indole was not involved in the rate-determining step. The results came from multiple reactions, including the reaction of 2-Bromonicotinaldehyde(cas: 128071-75-0Application In Synthesis of 2-Bromonicotinaldehyde)

2-Bromonicotinaldehyde(cas: 128071-75-0) 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. Application In Synthesis of 2-Bromonicotinaldehyde

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Quality Control of 4-CyanopyridineIn 2019 ,《Direct Arylation of α-Amino C(sp3)-H Bonds by Convergent Paired Electrolysis》 was published in Angewandte Chemie, International Edition. The article was written by Ma, Yueyue; Yao, Xiantong; Zhang, Lei; Ni, Pufan; Cheng, Ruihua; Ye, Jinxing. The article contains the following contents:

A metal-free convergent paired electrolysis strategy to synthesize benzylic amines through direct arylation of tertiary amines and benzonitrile derivatives at room temperature was developed. This TEMPO-mediated electrocatalytic reaction made full use of both anodic oxidation and cathodic reduction without metals or stoichiometric oxidants, thus showing great potential and advantages for practical synthesis. This convergent paired electrolysis method provided a straightforward and powerful means to activate C-H bonds and realize cross-coupling with cathodically generated species. The experimental process involved the reaction of 4-Cyanopyridine(cas: 100-48-1Quality Control of 4-Cyanopyridine)

4-Cyanopyridine(cas: 100-48-1) 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. Quality Control of 4-Cyanopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Hupfer, Maximilian L.; Ghosh, Soumik; Wang, Yingchun; Opsomer, Tomas; Mayerhofer, Thomas G.; Dehaen, Wim; Presselt, Martin published an article in Advanced Materials Interfaces. The title of the article was 《Dichroic Dipole Antenna Membranes from Aligned Linear BOPHY Dyes》.SDS of cas: 2510-22-7 The author mentioned the following in the article:

Linear dyes are mol. mimics of dipole antennas that receive UV-vis light. In this work the assembly of linear dyes via the Langmuir technique to achieve uniform dye alignment for optically anisotropic mol. dipole antenna arrays is presented. The mol. orientations in these arrays are quantified from Langmuir isotherms, topog. data, and from polarization- and angle-dependent UV-vis transmission spectra. It is achieved the smallest angles by which the transition dipole moment orientation deviates from vertical alignment (16°-30°) in the antenna arrays that have been reported in literature so far. The resulting maximum absorption contrast between grazing and vertical incidence amounts to 75%. This high optical anisotropy enables application as anisotropic receiver arrays in optical communication, as optical layers for privacy applications, or other applications building on dichroic dye layers. In the part of experimental materials, we found many familiar compounds, such as 4-Ethynylpyridine(cas: 2510-22-7SDS of cas: 2510-22-7)

4-Ethynylpyridine(cas: 2510-22-7) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. SDS of cas: 2510-22-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Mohamed, Gehad G.; Omar, Mohamed M. A.; Moustafa, Bassant S.; AbdEl-Halim, Hanan F.; Farag, Nahla A. published an article in Inorganic Chemistry Communications. The title of the article was 《Spectroscopic investigation, thermal, molecular structure, antimicrobial and anticancer activity with modelling studies of some metal complexes derived from isatin Schiff base ligand》.Formula: C5H7N3 The author mentioned the following in the article:

Condensation reaction between isatin drug and 2,6-diaminopyridine in a 1:1 M ratio, has been applied to prepare a tridentate Schiff base ligand (L). A series of metal complexes Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) have been synthesized. Prepared compounds were characterized by elemental analyses, IR, 1H NMR, UV-visible, solid reflectance, molar conductivity, mass spectroscopy, x-ray diffraction, scanning electron microscope, TGA and DTG. From the anal. data, (metal:ligand) ratio was 1:1 with tetrahedral geometry except for Cr(III), Fe(III), Cd(II) and Cu(II) complexes which have an octahedral geometry. All complexes are electrolytes except Fe(III) and Cd(II) complexes are nonelectrolytes. The IR spectra suggested that the ligand is coordinated to the metal ions in a neutral tridentate manner. 1H NMR spectra confirm the participation of the amino group in coordination. In vitro antimicrobial activities for (L) and its complexes were performed. Fe(III), Cu(II) and Cd(II) complexes showed the highest antibacterial activity against S. aureus (G+ bacteria). While, Co(II) and Cd(II) complexes were the most active complexes against B. subtilis. Cd(II) and Ni(II) complexes also recorded the highest activity against G-Salmonella species and E. coli, resp. The results presented the equity of Ni(II) and Zn(II) antifungal activity against C. albicans. The cytotoxicity of the prepared compounds was experienced against breast cancer (MCF-7 cells viability). The results revealed that Mn(II) complex have the lowest IC50 value which indicates the highest activity rather than the other compounds To gain insight of the binding mode, the ligand (L) was docked with the active site receptors of (PDB code 3HB5, 6CGD, and 3LD6). In the experiment, the researchers used many compounds, for example, 2,6-Diaminopyridine(cas: 141-86-6Formula: C5H7N3)

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.Formula: C5H7N3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Das, Sanjit; Nugegoda, Dinesh; Yao, Wenzhi; Qu, Fengrui; Figgins, Matthew T.; Lamb, Robert W.; Webster, Charles Edwin; Delcamp, Jared H.; Papish, Elizabeth T. published an article in European Journal of Inorganic Chemistry. The title of the article was 《Sensitized and Self-Sensitized Photocatalytic Carbon Dioxide Reduction Under Visible Light with Ruthenium Catalysts Shows Enhancements with More Conjugated Pincer Ligands》.Application In Synthesis of 4,4′-Dimethyl-2,2′-bipyridine The author mentioned the following in the article:

A new method to synthesize complexes of the type [(CNC)RuII(NN)L]n+ has been introduced, where CNC is a tridentate pincer composed of two (benz)imidazole derived NHC rings and a pyridyl ring, NN is a bidentate aromatic diimine ligand, L=bromide or acetonitrile, and n=1 or 2. Following this new method a series of six new complexes has been synthesized and characterized by spectroscopic, analytic, crystallog., and computational methods. Their electrochem. properties have been studied via cyclic voltammetry under both N2 and CO2 atmospheres. Photocatalytic reduction of CO2 to CO was performed using these complexes both in the presence (sensitized) and absence (self-sensitized) of an external photosensitizer. This study evaluates the effect of different CNC, NN, and L ligands in sensitized and self-sensitized photocatalysis. Catalysts bearing the benzimidazole derived CNC pincer show much better activity for both sensitized and self-sensitized photocatalysis as compared to catalysts bearing the imidazole derived CNC pincer. Furthermore, self-sensitized photocatalysis requires a diimine ligand for CO2 reduction with catalyst 2ACN being the most active catalyst in this series with TON=85 and TOF=22 h-1 with an electron donating 4,4′-dimethyl-2,2′-bipyridyl (dmb) ligand and a benzimidazole derived CNC pincer. In addition to this study using 4,4′-Dimethyl-2,2′-bipyridine, there are many other studies that have used 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Application In Synthesis of 4,4′-Dimethyl-2,2′-bipyridine) was used in this study.

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.Application In Synthesis of 4,4′-Dimethyl-2,2′-bipyridine 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

In 2022,Liu, Zhong; He, Jia-Hao; Zhang, Ming; Shi, Zhu-Jun; Tang, Han; Zhou, Xin-Yue; Tian, Jun-Jie; Wang, Xiao-Chen published an article in Journal of the American Chemical Society. The title of the article was 《Borane-Catalyzed C3-Alkylation of Pyridines with Imines, Aldehydes, or Ketones as Electrophiles》.COA of Formula: C5H6BNO2 The author mentioned the following in the article:

Achieving C3-selective pyridine functionalization is a longstanding challenge in organic chem. The existing methods, including electrophilic aromatic substitution and C-H activation, often require harsh reaction conditions and excess pyridine and generate multiple regioisomers. Herein, authors report a method for borane-catalyzed tandem reactions that result in exclusively C3-selective alkylation of pyridines. These tandem reactions consist of pyridine hydroboration, nucleophilic addition of the resulting dihydropyridine to an imine, an aldehyde, or a ketone, and subsequent oxidative aromatization. Because the pyridine is the limiting reactant and the reaction conditions are mild, this method constitutes a practical tool for late-stage functionalization of structurally complex pharmaceuticals bearing a pyridine moiety. In the experimental materials used by the author, we found Pyridin-3-ylboronic acid(cas: 1692-25-7COA of Formula: C5H6BNO2)

Pyridin-3-ylboronic acid(cas: 1692-25-7) 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.COA of Formula: C5H6BNO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Bowen; Luo, Bangke; Yang, He; Tang, Wenjun published an article in 2022. The article was titled 《Heck Reaction of N-Heteroaryl Halides for the Concise Synthesis of Chiral α-Heteroaryl-substituted Heterocycles》, and you may find the article in Angewandte Chemie, International Edition.Name: Methyl 5-bromopicolinate The information in the text is summarized as follows:

The Heck reaction between N-heteroaryl halides and heterocyclic alkenes provides a convenient approach to biol. relevant α-heteroaryl functionalized heterocycles, yet reactions of this type have been challenging due to strong N-heteroaryl coordination to palladium metal, which causes catalyst poisoning. In this report, an efficient palladium-catalyzed Heck reaction between N-heteroaryl halides and heterocyclic olefins is established, leading to a variety of α-heteroaryl substituted heterocycles. The method features an unprecedented broad substrate scope and excellent functional group compatibility. The employment of a sterically bulky P, P=O ligand containing an anthryl moiety is crucial for this transformation due to the coordinative unsaturation facilitated by its steric bulkiness. The asym. variant of the Heck reaction is achieved with (S)-DTBM-SEGPHOS via a cationic palladium pathway, which has enabled an efficient asym. synthesis of (S)-nicotine and its analogs. In the experimental materials used by the author, we found Methyl 5-bromopicolinate(cas: 29682-15-3Name: Methyl 5-bromopicolinate)

Methyl 5-bromopicolinate(cas: 29682-15-3) 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.Name: Methyl 5-bromopicolinate

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Liu, Lunjie; Gao, Mei-Yan; Yang, Haofan; Wang, Xiaoyan; Li, Xiaobo; Cooper, Andrew I. published an article in 2021. The article was titled 《Linear Conjugated Polymers for Solar-Driven Hydrogen Peroxide Production: The Importance of Catalyst Stability》, and you may find the article in Journal of the American Chemical Society.Electric Literature of C5H3Br2N The information in the text is summarized as follows:

Hydrogen peroxide (H2O2) is one of the most important industrial oxidants. In principle, photocatalytic H2O2 synthesis from oxygen and H2O using sunlight could provide a cleaner alternative route to the current anthraquinone process. Recently, conjugated organic materials have been studied as photocatalysts for solar fuels synthesis because they offer synthetic tunability over a large chem. space. Here, we used high-throughput experiments to discover a linear conjugated polymer, poly(3-4-ethynylphenyl)ethynyl)pyridine (DE7), which exhibits efficient photocatalytic H2O2 production from H2O and O2 under visible light illumination for periods of up to 10 h or so. The apparent quantum yield was 8.7% at 420 nm. Mechanistic investigations showed that the H2O2 was produced via the photoinduced stepwise reduction of O2. At longer photolysis times, however, this catalyst decomposed, suggesting a need to focus the photostability of organic photocatalysts, as well as the initial catalytic production rates. The experimental process involved the reaction of 2,5-Dibromopyridine(cas: 624-28-2Electric Literature of C5H3Br2N)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.Electric Literature of C5H3Br2N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

De Abreu, Maxime; Tang, Yue; Brachet, Etienne; Selkti, Mohamed; Michelet, Veronique; Belmont, Philippe published their research in Organic & Biomolecular Chemistry in 2021. The article was titled 《Silver-catalyzed tandem cycloisomerization/hydroarylation reactions and mechanistic investigations for an efficient access to 1,2-dihydroisoquinolines》.Category: pyridine-derivatives The article contains the following contents:

An efficient silver-catalyzed tandem reaction for the formation of 1,2-dihydroisoquinoline derivatives is herein reported. Highly functionalized multiheterocyclic scaffolds are accessible in a straightforward manner using readily accessible starting materials under mild conditions. This methodol. offers an attractive route for the synthesis and development of a biol. relevant new heterocyclic pharmacophore, merging the biol. activities of isoquinolines with those of various nitrogen-containing heterocycles (indoles, pyrroles) incorporated during the tandem reaction. Mechanistic investigations were also conducted along with a large scope and limitation study, modifying various sites of this pharmacophore. In the experimental materials used by the author, we found 2-Bromonicotinaldehyde(cas: 128071-75-0Category: pyridine-derivatives)

2-Bromonicotinaldehyde(cas: 128071-75-0) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem