Month: October 2022

Daley, Christopher J. A.; Wiles, Jason A.; Bergens, Steven H. published the artcile< Application of [Ru((R)-BINAP)(MeCN)(1-3:5,6-η-C8H11)](BF4) as a catalyst precursor for enantioselective hydrogenations>, COA of Formula: C6H10O5, the main research area is methyl methylbutanoate methylbutanoic acid enantioselective preparation; acetylphenylalanine enantioselective preparation; methylsuccinic acid methyl ester methylsuccinate enantioselective preparation; citronellol enantioselective preparation; ethyl hydroxybutanoate enantioselective preparation; malic acid methyl ester enantioselective preparation; ruthenium BINAP precursor enantioselective hydrogenation; nonracemic ruthenium BINAP catalyst precursor enantioselective hydrogenation; acetone acetonitrile solvate ruthenium BINAP catalyst; enantioselectivity unsaturated acid hydrogenation triethylamine dependence ruthenium BINAP catalyst; unsaturated ester acid hydrogenation enantioselectivity ruthenium BINAP catalyst; ketone hydrogenation enantioselectivity ruthenium BINAP catalyst; substrate dicarboxylate enantioselectivity hydrogenation ruthenium BINAP catalyst.

A catalyst system employing [Ru((R)-BINAP)(MeCN)(1-3:5,6-η5-C8H11)](BF4) (I) as a catalyst precursor was evaluated using the enantioselective hydrogenations of tiglic acid, α-acetamidocinnamic acid, itaconic acid, Me tiglate, di-Me itaconate, geraniol, Et acetoacetate, and di-Me oxaloacetate as a series of typical substrates. Acetone and MeOH were used as model aprotic and protic solvents, resp. The hydrogenation of substrates containing an α,β-unsaturated carboxylic acid functionality required stoichiometric quantities of NEt3 to occur at reasonable rates in acetone solution, while in MeOH solution it did not. The enantioselectivities were typically higher in acetone than in MeOH. This catalyst system is among the more enantioselective ruthenium-BINAP type systems reported for the catalytic hydrogenation of substrates containing an α,β-unsaturated acid or ester functionality. E.g., the hydrogenation of MeO2CC(:CH2)CH2CO2Me in acetone without Et3N under 4 atm H2 with I gave (S)-MeO2CCH(Me)CH2CO2Me with 100% conversion and in 95% ee. The enantioselectivities for the hydrogenation of ketones ranged from poor (15%) to moderate (74%). 1,4-Dicarboxylate substrates with the prochiral olefin or ketone at the 2-position were all hydrogenated in good to high ee with the same enantioface selectivity both with our system and other catalysts reported in the literature. This raised the possibility that these substrates were hydrogenated through intermediates with similar structural features.

Canadian Journal of Chemistry published new progress about Hydrogenation catalysts, stereoselective. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, COA of Formula: C6H10O5.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Gulick, Wilsom M. Jr.; Geske, David H. published the artcile< Examination of phosphorus hyperfine coupling constants in nitroaromatic anion radicals>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is .

The electron spin resonance spectra of the anion radicals produced by electrochem. reduction of diethyl 4-nitrophenyl phosphate (I), O O-diethyl O-4-nitrophenyl thiophosphate, diethyl 4-nitrobenzyl phosphonate (II), diphenyl 4-nitrophenyl phosphate, diphenyl 2,6-dimethyl-4-nitrophenyl phosphate, bis(4-methylphenyl) 4-nitrophenyl phosphate, and bis(2-methylphenyl) 4-nitrophenyl phosphate have been examined In every case, unequivocal assignment of a 31P hyperfine coupling constant, aP, was possible. The magnitude of aP varied from 7.05 gauss for the radical derived from I in acetonitrile to 17.51 gauss for the radical derived from II in HCONMe2. In all cases, the values of the N and nitrophenyl ring proton coupling constants remained closely similar to those observed for nitrobenzene anion. The variation in values of aP suggests that steric effects as well as inductive effects influence the 31P coupling constant in these radicals and that at least some contribution of a hyperconjugative mechanism is likely for transmission of unpaired spin to the P atom.

Journal of the American Chemical Society published new progress about Magnetic resonance. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Gaudencio, Susana P.; Pereira, Florbela published the artcile< A computer-aided drug design approach to predict marine drug-like leads for SARS-CoV-2 main protease inhibition>, Application of C19H34O2, the main research area is computer aided drug SARS CoV protease inhibition; actinomycetes; drug discovery; machine learning (ML) techniques; main protease enzyme (Mpro); marine natural products (MNPs); molecular docking; quantitative structure–activity relationship (QSAR); severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2); virtual screening.

The investigation of marine natural products (MNPs) as key resources for the discovery of drugs to mitigate the COVID-19 pandemic is a developing field. In this work, computer-aided drug design (CADD) approaches comprising ligand- and structure-based methods were explored for predicting SARS-CoV-2 main protease (Mpro) inhibitors. The CADD ligand-based method used a quant. structure-activity relationship (QSAR) classification model that was built using 5276 organic mols. extracted from the ChEMBL database with SARS-CoV-2 screening data. The best model achieved an overall predictive accuracy of up to 67% for an external and internal validation using test and training sets. Moreover, based on the best QSAR model, a virtual screening campaign was carried out using 11,162 MNPs retrieved from the Reaxys database, 7 inhouse MNPs obtained from marine-derived actinomycetes by the team, and 14 MNPs that are currently in the clin. pipeline. All the MNPs from the virtual screening libraries that were predicted as belonging to class A were selected for the CADD structure-based method. In the CADD structure-based approach, the 494 MNPs selected by the QSAR approach were screened by mol. docking against Mpro enzyme. A list of virtual screening hits comprising fifteen MNPs was assented by establishing several limits in this CADD approach, and five MNPs were proposed as the most promising marine drug-like leads as SARS-CoV-2 Mpro inhibitors, a benzo[f]pyrano[4,3-b]chromene, notoamide I, emindole SB beta-mannoside, and two bromoindole derivatives

Marine Drugs published new progress about Antiviral agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application of C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Garcia, Jordi; Vilarrasa, Jaume published the artcile< Fluoro azoles. An MNDO-SCF-MO study>, Formula: C19H34O2, the main research area is fluoro azole MNDO SCF MO; nitrogen heterocycle fluoro MNDO MO; heat formation fluoro azole; dipole moment fluoro azole; tautomerism fluoro azole; electron configuration fluoro azole; NMR fluoro azole.

MNDO calculations are reported for 43 fluorine-containing nitrogenated five-membered rings. The available exptl. data, on fluoropyrazoles and other fluoro azoles, correlate quite well with the calculated energies and charge distributions.

Heterocycles published new progress about Dipole moment. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Chahdoura, Faouzi; Mallet-Ladeira, Sonia; Gomez, Montserrat published the artcile< Palladium nanoparticles in glycerol: a clear-cut catalyst for one-pot multi-step processes applied in the synthesis of heterocyclic compounds>, Electric Literature of 112-63-0, the main research area is heterocyclic compound preparation; amine halide aryl alkyne carbonylative coupling intramol cyclization; palladium nanoparticle glycerol catalyst.

The palladium nanoparticles immobilized in a glycerol phase have been successfully applied in multi-step synthesis of N- and O-containing heterocycles, e.g., I and e.g., II by means of Pd-catalyzed one-pot protocols in glycerol medium. The dual homogeneous/heterogeneous catalytic behavior of Pd nanoparticles, sequential coupling/cyclization/hydrogenation transformations were efficiently carried out, without isolation of intermediates. The Pd-based catalytic glycerol phase was recycled up to ten times preserving its activity and selectivity. This is the first synthesis of heterocycles using palladium nanoparticles immobilized in a liquid phase catalyst.

Organic Chemistry Frontiers published new progress about Alkynes Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ohuchida, Shuichi; Hamanaka, Nobuyuki; Hayashi, Masaki published the artcile< Synthesis of thromboxane A2 analogs - 4. (±)-Dithiathromboxane A2 sodium salt>, Quality Control of 60705-25-1, the main research area is thia thromboxane platelet.

(±)-(9α,11α),11A-dithia-TXA2 (I) was prepared in 26 steps from (MeO)2CHCOCH2CO2Me and Cl(CH2)3CCCH2I via key intermediate thiopyranylheptenoate ester acetal II, whose cyclization gave an acetal which decomposed on attempted deacetalization, and its 6-[3-methoxycarbonyl)ethyl analog (III), which was ω-alkylated and then cyclized to give I, a very potent agonist. 15β-I caused rapid and irreversible human platelet aggregation.

Tetrahedron published new progress about Blood platelet. 60705-25-1 belongs to class esters-buliding-blocks, and the molecular formula is C7H12O5, Quality Control of 60705-25-1.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Berger, Michael L.; Schoedl, Clemens; Noe, Christian R. published the artcile< Benzimidazole-type glycine antagonists: the role of the ring nitrogen atoms>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is benzimidazole preparation glycine antagonist.

Several derivatives of 1H-benzimidazole-2-carboxylic acid (BICA, I) were tested in vitro in comparison to 1H-indole-2-carboxylic acid (ICA, II) for their ability to displace [3H]glycine from rat hippocampal membranes. Compound I was 8 times more potent than II (Ki 5.3 μM, as compared to 42 μM). However, introduction of a carboxymethyl group or a corresponding ester at position 3 had no pos. effect on the potency of I, while this type of structural modification increased the potency of II significantly. Nevertheless, 1-carboxymethyl-BICA displaced [3H]glycine with similar potency as the corresponding 3-carboxymethyl-ICA, indicating that a nitrogen atom lacking a hydrogen atom can be engaged in glycine receptor interaction. N-Methylation strongly reduced the potencies of both BICA and ICA derivatives

Archiv der Pharmazie (Weinheim, Germany) published new progress about Glutamate receptors Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Yang, Dandan; Huang, Hai; Li, Meng-Hui; Si, Xiao-Ju; Zhang, He; Niu, Jun-Long; Song, Mao-Ping published the artcile< Directed Cobalt-Catalyzed anti-Markovnikov Hydroalkylation of Unactivated Alkenes Enabled by ""Co-H"" Catalysis>, Product Details of C19H34O2, the main research area is direct cobalt catalyst anti Markovnikov hydroalkylation unactivated alkene.

The earth-abundant cobalt-catalyzed anti-Markovnikov hydroalkylation of unactivated alkenes with oxime esters was achieved by introducing an 8-aminoquinoline directing group on the alkenes. The catalytic system, consisting of com. available Co(acac)3 and PhMeSiH2, enables the construction of unfunctionalized C(sp3)-C(sp3) bonds and features exclusive anti-Markovnikov selectivity, good functional group tolerance, and the avoidance of an extra ligand, oxidant, or base. Mechanistic insight into this new catalytic system indicates the involvement of both alkyl radical and cobalt hydride intermediates.

Organic Letters published new progress about Alkenes Role: RCT (Reactant), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Chen, Jing; Zhou, Ji; Li, Mingxia; Li, Mu; Hu, Yunan; Zhang, Tao; Shi, Lianxuan published the artcile< Membrane lipid phosphorus reusing and antioxidant protecting played key roles in wild soybean resistance to phosphorus deficiency compared with cultivated soybean>, Category: esters-buliding-blocks, the main research area is Glycine soja phosphorus deficiency membrane lipid antioxidant protecting.

Crop yield and quality are generally limited by poor soils, which is a key limiting factor for sustainable development in modern agriculture. Wild soybean (Glycine soja) is an excellent wild resource, with tolerance to adverse environments, especially poor soil. This study aimed to reveal the key mol. mechanism of wild soybean to resist phosphorus deficiency in soil. Differences in the types, amounts and metabolic pathways of small mol. metabolites and gene expression were compared and multi-omics integration anal. was performed between wild and cultivated soybean (Glycine max) seedling roots under sufficient and artificially simulated low-phosphorus in this study. Results Under low-phosphorus stress, wild soybean seedlings experienced less growth inhibition and rootspecific growth compared with cultivated soybean. Genes encoding sulfoquinovosyl transferase (SQD2), catechol O-methyltransferase (COMT), glutathione S-transferase (GST) and peroxidase (POD) were upregulated; levels of glutamic acid, glycine, putrescine, phenylalanine, tyrosine, catechol and neohesperidin were increased; and levels of glycerol-3-phosphate decreased. Integrated anal. showed that the above genes and metabolites were involved in glutathione metabolism, glycerolipid metabolism and phenylpropane biosynthesis. Conclusions These metabolic pathways are involved in phosphorus reuse, while membrane lipid remodeling and reactive oxygen species scavenging are carried out to maintain membrane stability and ensure plant survival under phosphorus deficiency. This study provides new ideas for the study of mechanism of tolerance to phosphorus deficiency in wild soybean and lays the theor. foundation for developing varieties of cultivated soybean that tolerate poor soils.

Plant and Soil published new progress about Antioxidants. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Greis, Kim; Kirschbaum, Carla; Leichnitz, Sabrina; Gewinner, Sandy; Schoellkopf, Wieland; von Helden, Gert; Meijer, Gerard; Seeberger, Peter H.; Pagel, Kevin published the artcile< Direct Experimental Characterization of the Ferrier Glycosyl Cation in the Gas Phase>, Formula: C12H16O7, the main research area is Ferrier glycosyl cation gas phase structure exptl characterization.

The Ferrier rearrangement reaction is crucial for the synthesis of pharmaceuticals. Although its mechanism was described more than 50 years ago, the structure of the intermediate remains elusive. Two structures have been proposed for this Ferrier glycosyl cation: a 1,2-unsaturated cation that is resonance-stabilized within the pyranose ring or a cation that is stabilized by the anchimeric assistance of a neighboring acetyl group. Using a combination of gas-phase cryogenic IR spectroscopy in helium nanodroplets and first-principles d. functional theory, we provide the first direct structural characterization of Ferrier cations. The data show that both acetylated glucal and galactal lead to glycosyl cations of the dioxolenium type.

Organic Letters published new progress about Conformation. 4098-06-0 belongs to class esters-buliding-blocks, and the molecular formula is C12H16O7, Formula: C12H16O7.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics