Month: April 2022

Vaduvescu, Simona; Potvin, Pierre G. published an article about the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0,SMILESS:CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1 ).Reference of 4-(p-Tolyl)-2,2:6,2-terpyridine. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:89972-77-0) through the article.

Four ditopic bridging ligands, containing 2,2′:6′,2”-terpyridine and 2,6-dipyrazinylpyridine (dpp) metal-binding units attached through p- or m-phenylene linkages, were incorporated into eight mono-, di- and trinuclear linear Ru(II) complexes. These were characterized by UV/visible spectroscopy and cyclic voltammetry, and by their ability to undergo light-induced electron transfers to methylviologen. The dpp-bearing complexes were more difficult to prepare but were superior sensitizers, a fact attributable to longer excited state lifetimes and an electrostatically favored reductive quenching pathway.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Wang, Xiaoyu; Qin, Yaqiong; Nie, Cong; Guo, Junwei; Pan, Lining; Xie, Fuwei; Wang, Sheng; Wang, Bing; Zhao, Xiaodong; Wang, Baolin; Jia, Guotao researched the compound: (S)-3-(Piperidin-2-yl)pyridine( cas:494-52-0 ).Related Products of 494-52-0.They published the article 《Smokeless tobacco analysis: Simultaneous extraction and purification of alkaloids, volatile N-nitrosamines, and polycyclic hydrocarbons for GC-MS/MS》 about this compound( cas:494-52-0 ) in Journal of Separation Science. Keywords: smokeless tobacco alkaloid nitrosamine polycyclic hydrocarbon; Alkaloids; Polycyclic aromatic hydrocarbons; Simultaneous extraction; Smokeless tobacco product; Volatile nitrosoamines. We’ll tell you more about this compound (cas:494-52-0).

Several smokeless tobacco products are available in the market and comprise complex chem. matrixes. Sample preparation for anal. of the multiple classes of harmful compounds in smokeless tobacco products is highly cumbersome. In this study, a simultaneous extraction scheme was developed for three toxic analyte classes in smokeless tobacco products using a two-phase solution consisting of 5% aqueous NaOH and dichloromethane in a 1:4 ratio. The dichloromethane extract was used to analyze four alkaloids directly at levels greater than ppm; however, passing the layer through a silica cartridge for further purification and concentration was necessary for determining 18 polycyclic aromatic hydrocarbons and four volatile N-nitrosoamines at the ppt level. The multitargets were determined by using gas chromatog. with tandem mass spectrometry. The limits of detection for the 18 polycyclic aromatic hydrocarbons, four volatile N-nitrosoamines, three minor alkaloids, and nicotine were 0.2-1.2, 0.2-0.4, 0.6-1.0, and 10.2μg/g, resp. Four different smokeless tobacco substrates were fortified with three levels of mixed standards, and the recoveries ranged between 83 and 110%. The method was highly efficient, reduced the sample amounts, solvents, and the time required by approx. 60%. The method was used to assay 18 smokeless tobacco products, and showed potentials in assaying drugs and other plant-based substrates.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis of the enantiomers of 4-substituted γ-lactones with known absolute configuration, published in 1978, which mentions a compound: 32780-06-6, mainly applied to lactone alkyl alkenyl; deer pheromone enantiomeric composition, Formula: C5H8O3.

The highly pure enantiomers of several 4-alkyl and 4-alkenyl γ-lactones of known absolute configuration were prepared from glutamic acid enantiomers. The key step was selective p-toluenesulfonate displacement rather than ring opening of the lactone p-toluenesulfonate by Li dialkyl- or dialkenylcuprate. The enantiomeric purity of γ-caprolactone thus prepared was confirmed within the limitations of Pirkle’s chiral solvating agent. The enantiomers of (Z)-6-dodecen-4-olide were used for reference to determine the enantiomeric composition of the pheromone isolated from the black-tailed deer.

As far as I know, this compound(32780-06-6)Formula: C5H8O3 can be applied in many ways, which is helpful for the development of experiments. Therefore many people are doing relevant researches.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Regioselective Radical Borylation of α,β-Unsaturated Esters and Related Compounds by Visible Light Irradiation with an Organic Photocatalyst, published in 2021-06-04, which mentions a compound: 3393-45-1, Name is 5,6-Dihydro-2H-pyran-2-one, Molecular C5H6O2, Reference of 5,6-Dihydro-2H-pyran-2-one.

Radical hydroboration reactions have only recently been reported and are still rare. Here the authors describe a photoredox radical hydroboration of α,β-unsaturated esters, amides, ketones, and nitriles with NHC-boranes that uses only an organocatalyst and visible light. The conditions are mild, the substrate scope is broad, and the α/β regioselectivity is high. The reaction requires only the organocatalyst; there is no costly metal, and there are no other additives (base, cocatalyst, initiator).

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine(SMILESS: CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1,cas:89972-77-0) is researched.Name: Copper(I) tetra(acetonitrile) tetrafluoroborate. The article 《Furin Inhibition by Compounds of Copper and Zinc》 in relation to this compound, is published in Journal of Biological Chemistry. Let’s take a look at the latest research on this compound (cas:89972-77-0).

Furin, a human subtilisin-related proprotein convertase (SPC), is emerging as an important pharmaceutical target because it processes vital proteins of many aggressive pathogens. Furin inhibitors reported as yet are peptide derivatives and proteins, with the exception of andrographolides, which are natural compounds Here we report that the small and highly stable compounds M(chelate)Cl2 (M is copper or zinc) inhibit furin and Kex2, with Cu(TTP)Cl2 and Zn(TTP)Cl2 as the most efficient inhibitors. 4′-[P-tolyl]-2,2′:6′,2”-terpyridine (TTP) inhibitor is irreversible, competitive with substrate, and affected by substituents on the chelate. The free chelates are not inhibitors. Solvated Zn2+ is less potent than its complexes. This is true also for copper and Kex2. However, solvated Cu2+ (kon of 25,000±2,500 s-1) is more potent than Cu(TTP)Cl2 (kon = 140±13 s-1) and allows recovery of furin activity prior to a second inhibition phase. A mechanism that involves coordination to the catalytic histidine is proposed for all inhibitors. Target specificity is indicated by the fact that these metal chelate inhibitors are much less potent toward Kex2, the yeast homolog of furin. For example, kon with Zn(TTP)Cl2 is 120±20 s-1 for furin, but only 1.2±0.1 s-1 for Kex2.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The phosphorylated regulator of chemotaxis is crucial throughout biofilm biogenesis in Shewanella oneidensis》. Authors are Boyeldieu, Anne; Ali Chaouche, Amine; Ba, Moly; Honore, Flora Ambre; Mejean, Vincent; Jourlin-Castelli, Cecile.The article about the compound:(S)-3-(Piperidin-2-yl)pyridinecas:494-52-0,SMILESS:C1(C=NC=CC=1)[C@@H]1CCCCN1).Synthetic Route of C10H14N2. Through the article, more information about this compound (cas:494-52-0) is conveyed.

Abstract: The core of the chemotaxis system of Shewanella oneidensis is made of the CheA3 kinase and the CheY3 regulator. When appropriated, CheA3 phosphorylates CheY3, which, in turn, binds to the rotor of the flagellum to modify the swimming direction. In this study, we showed that phosphorylated CheY3 (CheY3-P) also plays an essential role during biogenesis of the solid-surface-associated biofilm (SSA-biofilm). Indeed, in a ΔcheY3 strain, the formation of this biofilm is abolished. Using the phospho-mimetic CheY3D56E mutant, we showed that CheY-P is required throughout the biogenesis of the biofilm but CheY3 phosphorylation is independent of CheA3 during this process. We have recently found that CheY3 interacts with two diguanylate cyclases (DGCs) and with MxdA, the c-di-GMP effector, probably triggering exopolysaccharide synthesis by the Mxd machinery. Here, we discovered two addnl. DGCs involved in SSA-biofilm development and showed that one of them interacts with CheY3. We therefore propose that CheY3-P acts together with DGCs to control SSA-biofilm formation. Interestingly, two orthologous CheY regulators complement the biofilm defect of a ΔcheY3 strain, supporting the idea that biofilm formation could involve CheY regulators in other bacteria.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 2834-05-1, is researched, SMILESS is O=C(O)CCCCCCCCCCBr, Molecular C11H21BrO2Journal, Article, Photochemical & Photobiological Sciences called Fluorescence detection of pyrene-stained Bacillus subtilis LPM1 rhizobacteria from colonized patterns of tomato roots, Author is Hernandez, Monica; Ortiz-Castro, Randy; Flores-Olivas, Alberto; Moggio, Ivana; Arias, Eduardo; Valenzuela-Soto, Jose Humberto, the main research direction is fluorescence detection pyrene Bacillus tomato root.Application In Synthesis of 11-Bromoundecanoic acid.

A series of water soluble 8-alcoxypyrene-1,3,6-trisulfonic sodium salts bearing different alcoxy lateral chains and functional end groups was synthesized and the mol. structure was corroborated by NMR spectroscopy. The photophys. properties in water analyzed by UV-Vis and static and dynamic fluorescence revealed that all of the pigments emit in the blue region at a maximal wavelength of 436 nm and with fluorescence lifetimes in the range of ns. Among them, sodium 8-((10-carboxydecyl) oxy) pyrene-1,3,6-trisulfonate M1 exhibits a high fluorescence quantum yield (ϕ = 80%) and a good interaction with B. subtilis LPM1 rhizobacteria; this has been demonstrated through in vitro staining assays. Tomato plants (Solanum lycopersicon cv.Micro-Tom) increased the release of root exudates, mainly malic and fumaric acids, after 12 h of treatment with benzothiadiazole (BTH) as a foliar elicitor. However, the chemotaxis anal. demonstrated that malic acid is the most powerful chemoattractant of the rhizobacteria Bacillus subtilis LPM1: in agar plates, a major growth (60 mm) was found for a concentration of 100 mM, while in capillary tubes, the earliest response was at 30 min with 3.3 x 108 CFU mL-1. The confocal microscopic anal. carried out on the tomato roots of the pyrene stained B. subtilis LPM1 revealed that this bacterium mainly colonizes the epidermal zones, i.e. the junctions to primary roots, lateral roots and root hairs, meaning that these root hair sections are the highest colonisable sites involved in the biosynthesis of exudates. This fluorescent pyrene marker M1 represents a valuable tool to evaluate B. subtilis-plant interactions in an easy and quick test in both in vitro and in vivo tomato crops.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《A Simple and High-Throughput LC-MS-MS Method for Simultaneous Measurement of Nicotine, Cotinine, 3-OH Cotinine, Nornicotine and Anabasine in Urine and Its Application in the General Korean Population.》. Authors are Oh, Jongwon; Park, Min-Seung; Chun, Mi-Ryung; Hwang, Jung Hye; Lee, Jin-Young; Jee, Jae Hwan; Lee, Soo-Youn.The article about the compound:(S)-3-(Piperidin-2-yl)pyridinecas:494-52-0,SMILESS:C1(C=NC=CC=1)[C@@H]1CCCCN1).Application In Synthesis of (S)-3-(Piperidin-2-yl)pyridine. Through the article, more information about this compound (cas:494-52-0) is conveyed.

Measuring nicotine metabolites is the most objective method for identifying smoke exposure. Liquid chromatography–tandem mass spectrometry (LC-MS-MS) can measure multiple metabolites and is sensitive enough to detect low concentrations of metabolites. Therefore, we developed a simple and high-throughput method for measuring nicotine, cotinine, trans-3′-hydroxycotinine (3-OH cotinine), nornicotine and anabasine for population-based studies using LC-MS-MS. Each 30 µL of urine sample was diluted with 90 µL of acetonitrile containing five deuterated internal standards. Chromatographic separation used a C18 column, and LC-MS-MS analysis was performed with a multiple reaction monitoring mode. The chromatographic run time for each sample was 6.5 min. The method was validated by evaluating selectivity, interference, limit of detection, lower limit of quantification, precision, accuracy, linearity, extraction recovery, matrix effect and carryover according to guidelines. Our methods required a short preparation time (∼20 min) while simultaneously measuring five markers for smoking status. No endogenous or exogenous interference was found. Our method showed excellent precision and accuracy: within-run coefficient of variation (CV) 2.9-9.4%, between-run CV 4.8-8.7% and bias -10.1 to 5.3%. Linear dynamic ranges were 1-10,000 ng/mL for nicotine, nornicotine and anabasine; 2-5,000 ng/mL for cotinine and 5-15,000 ng/mL for 3-OH cotinine. Extraction recovery was consistent (87-109%) across concentrations. No significant matrix effect or carryover was observed. The validated method was applied to 849 urine samples. In samples from the 125 current smokers, nicotine, cotinine, 3-OH cotinine, nornicotine and anabasine were detected in 97.6, 99.2, 98.4, 96.8 and 87.2%, respectively. No markers were detected in 93.9% of 609 nonsmokers. The overlapping detection of multiple markers made it possible to identify the smoking status even in current smokers with a low concentration of cotinine. Our LC-MS-MS method using a simple sample preparation technique is sensitive and effective for screening of smoking status in the general population.

This literature about this compound(494-52-0)Application In Synthesis of (S)-3-(Piperidin-2-yl)pyridinehas given us a lot of inspiration, and I hope that the research on this compound((S)-3-(Piperidin-2-yl)pyridine) can be further advanced. Maybe we can get more compounds in a similar way.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0 ) is researched.Application In Synthesis of 4-(p-Tolyl)-2,2:6,2-terpyridine.Wang, Xiao-xia; Liu, Han-guo; Wan, Xia; Yin, Xia; Zhou, Fu-shan; Wu, Jian-zhong published the article 《Synthesis of 4-tolyl-2,2′:6′,2”-terpyridine》 about this compound( cas:89972-77-0 ) in Huaxue Shiji. Keywords: methylphenyl terpyridine preparation cyclization. Let’s learn more about this compound (cas:89972-77-0).

3-(4-Methylphenyl)-1,5-di(2-pyridinyl)-1,5-pentanedione was prepared by reaction of 2-acetylpyridine with 4-methylbenzaldehyde at room temperature using ethanol as the solvent. Treatment of the latter compound with concentrated ammonia for 1 h in the presence of sodium hydroxide gave the title compound [i.e., 4′-(4-methylphenyl)-2,2′:6′,2”-terpyridine] in 31.7% yield. The above reaction conditions were mild and the products could be purified easily.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, is researched, Molecular C5H8O3, CAS is 32780-06-6, about Stereochemical studies. XXX. Stereoselective synthesis of D-ribose from L-glutamic acid.COA of Formula: C5H8O3.

D-Ribose was prepared in 10 steps from L-glutamic acid (I) using the chiral center of I as C-4 of D-ribose. Oxidation of Me 5-O-benzyl-2,3-dideoxy-D-pent-2-enofuranoside with OsO4 or KMnO4 occurred preferentially from the rear side of the C-1 OMe group.

Compound(32780-06-6)COA of Formula: C5H8O3 received a lot of attention, and I have introduced some compounds in other articles, similar to this compound((S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one), if you are interested, you can check out my other related articles.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI