Month: February 2023

Importance of dual resonance susceptibilities for pi-donor and pi-acceptor substituents regarding a quantitative description of substituent effects. The case of basicity of pyridine N-oxides was written by Sawada, Masami;Yukawa, Yasuhide;Hanafusa, Terukiyo;Tsuno, Yuho. And the article was included in Tetrahedron Letters in 1980.COA of Formula: C7H9NO This article mentions the following:

Basicities of 21 m– and p-substituted pyridine N-oxides in H₂O were successfully described by the generalized LArSR equation, which potentially allows a dual resonance effect. In the experiment, the researchers used many compounds, for example, 3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8COA of Formula: C7H9NO).

3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the 锜?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 锜?bonds. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.COA of Formula: C7H9NO

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Evaluation of Halogenopyridinium Cations as Halogen Bond Donors was written by Fotovic, Luka;Bedekovic, Nikola;Stilinovic, Vladimir. And the article was included in Crystal Growth & Design in 2021.Reference of 626-64-2 This article mentions the following:

We have performed a database survey and a structural and computational study of the potential and the limitations of halogenopyridinium cations as halogen bond donors. The database survey demonstrated that adding a pos. charge on a halogenopyridine ring increases the probability that the halogen atom will participate in a halogen bond, although for chloropyridines it remains below 60%. Crystal structures of both protonated and N-methylated monohalogenated pyridinium cations revealed that the iodo- and bromopyridinium cations always form halogen-bonding contacts with the iodide anions shorter than the sum of the vdW radii, while chloropyridinium cations mostly participate in longer contacts or fail to form halogen bonds. Although a DFT study of the electrostatic potential has shown that both protonation and N-methylation of halogenopyridines leads to a considerable increase in the ESP of the halogen 锜?hole, it is generally not the most pos. site on the cation, allowing for alternate binding sites. In the experiment, the researchers used many compounds, for example, Pyridin-4-ol (cas: 626-64-2Reference of 626-64-2).

Pyridin-4-ol (cas: 626-64-2) belongs to pyridine derivatives. Pyridine has a conjugated system of six 锜?electrons that are delocalized over the ring. The molecule is planar and, thus, follows the H鐪塩kel criteria for aromatic systems. 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. Reference of 626-64-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthesis and characterization of N-hydroxy-7-(3-substituted ureido)-4-(4-((4-(morpholinomethyl)phenyl)ethynyl)phenyl)-1,8-naphthyridine-2-carboxamides: a novel class of potential antibacterial, antifungal and anthelmintic agents was written by Prasad, V. Kamala;Sanjeeva, P.;Manjunath, G.;Rao, B. Subba;Ramana, P. Venkata. And the article was included in Heterocyclic Letters in 2022.Recommanded Product: N-(6-Aminopyridin-2-yl)acetamide This article mentions the following:

N-hydroxy-7-(3-substituted ureido)-4-(4-((4-(morpholinomethyl)phenyl)ethynyl) phenyl)-1,8-naphthyridine-2-carboxamides I [R = Et, i-Pr, Ph, etc.; R¹ = NHOH] were synthesized by treating Me 7-(3-substituted ureido)-4-(4-((4-(morpholinomethyl)phenyl)ethynyl) phenyl)-1,8-naphthyridine-2-carboxylate I [R¹ = OMe] with hydroxylamine in ethanol/THF. These newly synthesized 1,8-naphthyridine derivatives I were screened for their antibacterial, antifungal and anthelmintic activities against the resp. strains. The results showed that introduction of electron donating groups in the ureido moiety results in a significant decrease of antimicrobial activity and an increase in anthelmintic activity. In the experiment, the researchers used many compounds, for example, N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3Recommanded Product: N-(6-Aminopyridin-2-yl)acetamide).

N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the 锜?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 锜?bonds. 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.Recommanded Product: N-(6-Aminopyridin-2-yl)acetamide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

2-Aryl-4,5,6,7-tetrahydro-1,3-benzothiazol-7-ols as a class of antitumor agents selectively active in securin^-/- cells was written by Zhang, Nan;Ayral-Kaloustian, Semiramis;Niu, Chuansheng;Nguyen, Thai;Upeslacis, Erik;Mansour, Tarek S.;Ragunathan, Shoba;Rosfjord, Edward. And the article was included in Bioorganic & Medicinal Chemistry Letters in 2010.HPLC of Formula: 85838-94-4 This article mentions the following:

A series of 2-(4-aminophenyl)-4,5,6,7-tetrahydro-1,3-benzothiazol-7-ols have been developed as antitumor agents that showed high selectivity against aneuploid cell lines (vs diploid cell lines). Structure-activity relationship studies showed that a hydroxymethyl group at the 2-position of the Ph ring increased potency and selectivity. A pyrrolidinyl group at the 4-position of the Ph ring was comparable to a dimethylamino group. The corresponding 5-aza analogs, 2-(4-aminophenyl)-4,5,6,7-tetrahydro[1,3]thiazolo[4,5-c]pyridin-7-ols, retained potency and high level of selectivity against aneuploid cell growth (vs diploid cells). These 5-aza compounds exhibited higher water solubility and higher metabolic stability than the corresponding carba analogs. Compound 19 (I) showed the highest potency against MCF-7 and MDA-MB-361 lines and was selected for further evaluation. In the experiment, the researchers used many compounds, for example, tert-Butyl 5,6-dihydropyridine-1(2H)-carboxylate (cas: 85838-94-4HPLC of Formula: 85838-94-4).

tert-Butyl 5,6-dihydropyridine-1(2H)-carboxylate (cas: 85838-94-4) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. HPLC of Formula: 85838-94-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthesis and Utility of Dihydropyridine Boronic Esters was written by Panda, Santanu;Coffin, Aaron;Nguyen, Q. Nhu;Tantillo, Dean J.;Ready, Joseph M.. And the article was included in Angewandte Chemie, International Edition in 2016.Electric Literature of C11H17N This article mentions the following:

When activated by an acylating agent, pyridine boronic esters react with organometallic reagents to form a dihydropyridine boronic ester. This intermediate allows access to a number of valuable substituted pyridine, dihydropyridine, and piperidine products. In the experiment, the researchers used many compounds, for example, 4-Hexylpyridine (cas: 27876-24-0Electric Literature of C11H17N).

4-Hexylpyridine (cas: 27876-24-0) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of 閳?8.7 鑴?10閳? cm3璺痬ol閳?.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ璺痬ol閳? in the liquid phase and 140.4 kJ璺痬ol閳? 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. Electric Literature of C11H17N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Pd-Catalyzed Diamination of 1,2,4-Triazinyl Complexant Scaffolds was written by Tai, Serene;Dover, Evan J.;Marchi, Sydney V.;Carrick, Jesse D.. And the article was included in Journal of Organic Chemistry in 2015.Safety of 4-Methylpicolinonitrile This article mentions the following:

As part of ongoing efforts in this laboratory to design and synthesize multidentate soft-N-donors as effective complexants for chemoselective minor actinide extraction from used nuclear fuel, a series of aminated mono-1,2,4-triazinylpyridines were required. This study focuses on streamlining convergent access to a diverse array of functionalized N-donors using Pd-catalysis from a common synthon affording access to pyridinyl triazines as the 4,4′-amino derivatives which are com. limited and unsuccessful in traditional condensation chem. A general Pd-catalyzed method for the double amination of functionalized pyridinyl-1,2,4-triazines with low catalyst/ligand loadings enabling the formation of 16 novel complexants is presented. In the experiment, the researchers used many compounds, for example, 4-Methylpicolinonitrile (cas: 1620-76-4Safety of 4-Methylpicolinonitrile).

4-Methylpicolinonitrile (cas: 1620-76-4) 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. 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.Safety of 4-Methylpicolinonitrile

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Facilitating Ir-Catalyzed C-H Alkynylation with Electrochemistry: Anodic Oxidation-Induced Reductive Elimination was written by Ye, Xiaohan;Wang, Chenhuan;Zhang, Shuyao;Wei, Jingwen;Shan, Chuan;Wojtas, Lukasz;Xie, Yan;Shi, Xiaodong. And the article was included in ACS Catalysis in 2020.SDS of cas: 4783-68-0 This article mentions the following:

An electrochem. approach in promoting directed C-H alkynylation with terminal alkyne via iridium catalysis is reported. This work employed anodic oxidation of Ir(III) intermediate (characterized by X-ray crystallog.) to promote reductive elimination, giving the desired coupling products in good yields (up to 95%) without the addition of any other external oxidants. This transformation is suitable for various directing groups with H₂ as the only byproduct, which warrants a high atom economy and practical oxidative C-C bond formation under mild conditions. In the experiment, the researchers used many compounds, for example, 2-Phenoxypyridine (cas: 4783-68-0SDS of cas: 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. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.SDS of cas: 4783-68-0

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

A new synthesis of symmetrical 2,5-disubstituted 1,3,4-oxadiazoles was written by Bentiss, Fouad;Lagrenee, Michel. And the article was included in Journal of Heterocyclic Chemistry in 1999.Name: 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole This article mentions the following:

Title compounds I [R = (un)substituted phenyl; 2-, 3-, 4-pyridinyl; 2-thienyl] were prepared in good yields by reaction of aromatic acids with hydrazine dihydrochloride in a mixture of orthophosphoric acid, phosphorus pentoxide and, in general, with addition of phosphorus oxychloride to the reaction mixture In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7Name: 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. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the 锜?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 锜?bonds. 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. Name: 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

A convenient synthesis of perfluoroalkylated indolizinylphosphonates was written by Shen, Yanchang;Zhang, Yuming;Jiang, Guo-Fang. And the article was included in Synthesis in 2002.HPLC of Formula: 17281-59-3 This article mentions the following:

A convenient method for the synthesis of perfluoroalkylated indolizinylphosphonates via the 1,3-cycloaddition of pyridinium N-ylides and perfluoroalkynylphosphonates in 49-77% yields is described. In the experiment, the researchers used many compounds, for example, 1-(Cyanomethyl)pyridin-1-ium chloride (cas: 17281-59-3HPLC of Formula: 17281-59-3).

1-(Cyanomethyl)pyridin-1-ium chloride (cas: 17281-59-3) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. 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.HPLC of Formula: 17281-59-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Pyridinium based ionic liquid: A pretreatment solvent and reaction medium for catalytic conversion of cellulose to total reducing sugars (TRS) was written by Saher, Saliha;Saleem, Haris;Asim, Azmat Mehmood;Uroos, Maliha;Muhammad, Nawshad. And the article was included in Journal of Molecular Liquids in 2018.Recommanded Product: 1-Butyl-3-methylpyridinium Chloride This article mentions the following:

In the last decade, the transformation of lignocellulosic biomass into biofuel through a sugar platform has been an active research subject due to depletion of fossil fuel sources. Total reducing sugars (TRS) obtained from lignocellulosic materials are considered intermediates for the preparation of various valuable chem. compounds In this work, pyridinium based ionic liquids were synthesized and utilized for the dissolution of cellulose and further conversion to TRS in the presence of metal salts as catalysts. The prepared ILs were characterized using ¹H NMR and evaluated for the dissolution of cellulose and found that [C₄C₁Py][Cl] is the best solvent to dissolve it up to 28% at 110 鎺矯. Optical microscopy in conjunction with FTIR, SEM, XRD and TGA analyzes were employed to monitor dissolution phenomenon and ascertain structural changes in regenerated cellulose. SEM results showed disrupted flaky construction for regenerated cellulose. The thermal stability decreased for regenerated cellulose as observed by TGA anal. This desirable change in cellulose after IL pretreatment was utilized to facilitate metal salts based on the catalytic conversion of cellulose to TRS. Among metal salts, CoCl₂ was identified as the best one to generate the highest yield of TRS i.e. 78% at 110 鎺矯 for 4 h. Various reaction conditions like time, temperature, and catalyst loading were optimized for catalytic conversion. The optimum conditions were observed at 4 h treatment time, 120 鎺矯 and 12% catalyst loading. In the experiment, the researchers used many compounds, for example, 1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3Recommanded Product: 1-Butyl-3-methylpyridinium Chloride).

1-Butyl-3-methylpyridinium Chloride (cas: 125652-55-3) 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. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Recommanded Product: 1-Butyl-3-methylpyridinium Chloride

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem