Month: October 2022

Stoyanovich, F. M.; Marakatkina, M. A. published the artcile< Formation of 3-lithio-4,5-dehydrotoluene from 4-fluoro-3,5-dibromotoluene>, Synthetic Route of 112-63-0, the main research area is lithiodehydrotoluene; benzyne lithium derivative; dehydrotoluene lithio.

Treating 4,3,5-Br(F)2C6H2Me with BuLi at -90° gave only 2,3,5-F(Br)(Me)C6H2CO2H after carbonation, but analogous reaction at -70° gave 4,3,5-Bu(HO2C)2C6H2Me via the title benzyne (I). I also gave dimers II (R = H, CO2H), and reacted with LiNPh2 to give 4,3,5-Ph2N(R)2C6H2Me (same R).

Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya published new progress about Elimination reaction. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

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

Bekele, Tefsit; Shah, Meha H.; Wolfer, Jamison; Abraham, Ciby J.; Weatherwax, Anthony; Lectka, Thomas published the artcile< Catalytic, Enantioselective [4 + 2]-Cycloadditions of Ketene Enolates and o-Quinones: Efficient Entry to Chiral, α-Oxygenated Carboxylic Acid Derivatives>, Safety of (R)-Methyl 2-hydroxybutanoate, the main research area is cinchona alkaloid catalyst enantioselective cycloaddition quinone ketene enolate.

The authors report catalytic, enantioselective [4 + 2]-cycloadditions of o-quinones with ketene enolates (derived from readily available acid chlorides) using cinchona alkaloid derivatives as catalysts to produce products in high enantiomeric excess (ee) and good to excellent yields. The thermodn. driving force for these reactions is due in part to the restoration of aromaticity to the products. The resulting chiral, bicycloadducts, e.g. I, can be synthetically manipulated in a variety of useful ways, for example to provide a flexible synthesis of α-oxygenated carboxylic acid derivatives

Journal of the American Chemical Society published new progress about [4+2] Cycloaddition reaction. 73349-07-2 belongs to class esters-buliding-blocks, and the molecular formula is C5H10O3, Safety of (R)-Methyl 2-hydroxybutanoate.

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

Haefliger, Joel; Livingstone, Keith; Daniliuc, Constantin G.; Gilmour, Ryan published the artcile< Difluorination of α-(bromomethyl)styrenes via I(I)/I(II) catalysis: facile access to electrophilic linchpins for drug discovery>, Category: esters-buliding-blocks, the main research area is bromomethyl styrene catalysis electrophilic linchpin drug discovery difluorination.

Simple α-(bromomethyl)styrenes can be processed to a variety of 1,1-difluorinated electrophilic building blocks via I(I)/I(III) catalysis. This inexpensive main group catalysis strategy employs p-TolI as an effective organocatalyst when combined with Selectfluor and simple amine·HF complexes. Modulating Bronsted acidity enables simultaneous geminal and vicinal difluorination to occur, thereby providing a platform to generate multiply fluorinated scaffolds for further downstream derivatization. The method facilitates access to a tetrafluorinated API candidate for the treatment of amyotrophic lateral sclerosis. Preliminary validation of an enantioselective process is disclosed to access α-phenyl-β-difluoro-γ-bromo/chloro esters.

Chemical Science published new progress about Amyotrophic lateral sclerosis. 24347-63-5 belongs to class esters-buliding-blocks, and the molecular formula is C6H12O3, Category: esters-buliding-blocks.

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

Kurthkoti, Krishna; Kumar, Pradeep; Sang, Pau Biak; Varshney, Umesh published the artcile< Base excision repair pathways of bacteria: new promise for an old problem>, Formula: C19H34O2, the main research area is bacteria base excision repair pathway review.

A review. Infectious diseases continue to be a major cause of human mortality. With the emergence of drug resistance, diseases that were long thought to have been curable by antibiotics are resurging. There is an urgent clin. need for newer antibiotics that target novel cellular pathways to overcome resistance to currently used therapeutics. The base excision repair (BER) pathways of the pathogen restore altered bases and safeguard the genomic integrity of the pathogen from the host′s immune response. Although the BER machinery is of paramount importance to the survival of the pathogens, its potential as a drug target is largely unexplored. In this review, we discuss the importance of BER in different pathogenic organisms and the potential of its inhibition with small mols.

Future Medicinal Chemistry published new progress about Chemotherapy Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 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

Huang, Lichuang; Hu, Shaoqi; Shao, Meiyu; Wu, Xin; Zhang, Jida; Cao, Gang published the artcile< Combined cornus officinalis and paeonia lactiflora pall therapy alleviates rheumatoid arthritis by regulating synovial apoptosis via AMPK-mediated mitochondrial fission>, HPLC of Formula: 112-63-0, the main research area is cornus officinalis paeonia lactiflora rheumatoid arthritis synovial apoptosis; inflammation; oxidative stress; paeoniflorin; synovial tissue; ursolic acid.

Rheumatoid arthritis (RA) is a chronic autoimmune disease that leads to cartilage destruction and bone erosion. In-depth exploration of the pathogenesis of RA and the development of effective therapeutic drugs are of important clin. and social value. Herein, we explored the medicinal value of Cornus officinalis Sieb. and Paeonia lactiflora Pall. in RA treatment using a rat model of collagen-induced arthritis (CIA).We compared the therapeutic effect of Cornus officinalis and Paeonia lactiflora with that of their main active compounds, ursolic acid and paeoniflorin, resp. We demonstrated that the combination of Cornus officinalis and Paeonia lactiflora effectively inhibited the release of factors associated with oxidative stress and inflammation during RA, therein ameliorating the symptoms and suppressing the progression of RA. We further showed that the underlying mechanisms may be related to the regulation of apoptosis in synovial tissues, and we investigated the potential involvement of AMPK-mediated mitochondrial dynamics in the therapeutic action of the two drugs and their active components.

Frontiers in Pharmacology published new progress about AMP-activated protein kinase activators. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

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

Peng, Wei; Chen, Yunhui; Tumilty, Steve; Liu, Lizhou; Luo, Ling; Yin, Haiyan; Xie, Yongmei published the artcile< Paeoniflorin is a promising natural monomer for neurodegenerative diseases via modulation of Ca2+ and ROS homeostasis>, HPLC of Formula: 112-63-0, the main research area is calcium neuroprotectant neurodegenerative.

Neurodegenerative diseases (NDDs) are a range of neurol. disorders featured by neuronal degeneration and apoptosis. Cellular Calcium (Ca2+) and reactive oxygen species (ROS) dyshomeostasis are the earliest and important events in the development of NDDs and may yield promising therapeutic targets for NDDs. Paeoniflorin, a water-soluble monoterpene glucoside, is the major bioactive monomer extracted from the root of Paeonia lactiflora pall. Increasing evidence has suggested that this natural compound might be used to treat various NDDs, and its potential mol. mechanisms are related to the modulation of Ca2+/ROS homeostasis in cells. In addition, paeoniflorin accounts for more than 40% of the total glucosides of herbaceous peonies with abundant herbaceous sources. Furthermore, it has also been validated as a safe extraction in clin. pharmacol. research with a wide therapeutic window. Hence, it is rational to anticipate paeoniflorin being a promising candidate for the treatment of NDDs via regulating Ca2+/ROS dyshomeostasis.

Current Opinion in Pharmacology published new progress about Homeostasis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, HPLC of Formula: 112-63-0.

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

Pauton, Mathilde; Aubert, Catherine; Bluet, Guillaume; Gruss-Leleu, Florence; Roy, Sebastien; Perrio, Cecile published the artcile< Development, Optimization, and Scope of the Radiosynthesis of 3/5-[18F]Fluoropyridines from Readily Prepared Aryl(pyridinyl) Iodonium Salts: The Importance of TEMPO and K2CO3>, Category: esters-buliding-blocks, the main research area is fluoropyridine radiopreparationarylpyridinyl iodonium salt TEMPO potassium carbonate radiolabeling.

A robust process for the radiosynthesis of 3/5-[18F]fluoropyridines was developed by radiofluorination of iodonium triflates using K18F/K2CO3/K222 complex in the presence of TEMPO. Both electronically deficient and enriched iodonium salts were readily obtained from the corresponding 3/5-iodopyridines and afforded the corresponding 3/5-[18F]fluoropyridines in 6-78% yields. The concentrations of K2CO3 and TEMPO are crucial for the radiofluorination efficiency. The process was validated using two automated systems for the 18F-radiolabeling of 2-chloro and 2-carboxamido-5-fluoropyridines carried out in 10-20% yields.

Organic Process Research & Development published new progress about Iodonium compounds, aryl Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 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

Ono, Masahiro; Wilson, Alan; Nobrega, Jose; Westaway, David; Verhoeff, Paul; Zhuang, Zhi-Ping; Kung, Mei-Ping; Kung, Hank F. published the artcile< 11C-labeled stilbene derivatives as Aβ-aggregate-specific PET imaging agents for Alzheimer's disease>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is carbon 11 stilbene preparation PET Alzheimer amyloid plaque.

A series of stilbene derivatives as potential diagnostic imaging agents targeting amyloid plaques in Alzheimer’s disease (AD) were synthesized and evaluated. The syntheses of the stilbenes were successfully achieved by a simple Wadsworth-Emmons reaction between di-Et (4-nitrobenzyl)phosphonate and 4-methoxybenzaldehyde. 4-N,N-dimethylamino-4′-methyoxy and the corresponding 4-N-monomethylamino-, 4′-hydroxy stilbenes showed good binding affinities towards Aβ aggregates in vitro (Ki < 10 nM). The 11C labeled 4-N-methylamino-4'-hydroxystilbene, [11C]4, was prepared by 11C methylation of 4-amino-4'-hydroxystilbene. The [11C]4 displayed a moderate lipophilicity (log P = 2.36), and showed a very good brain penetration and washout from normal rat brain after an iv injection. In vitro autoradiog. of transgenic AD mouse brain sections showed a high specific labeling of β-amyloid plaques, whereas the control sections showed no binding. Taken together the data suggest that a relatively simple stilbene derivative, [11C]4, N-[11C]methylamino-4'-hydroxystilbene, may be useful as a positron emission tomog. (PET) imaging agent for mapping Aβ plaques in the brain of patients with Alzheimer's disease. Nuclear Medicine and Biology published new progress about Alzheimer disease. 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

El-Bindary, Ashraf; Kiwaan, Hala; Shoair, Abdel Ghany; El-Ablack, Fawzia; Eessa, Ahmed published the artcile< Synthesis and characterization of hyperbranched silane-modified alkyd as a polymer for environmentally friendly low VOC polyurethane coatings>, Formula: C19H34O2, the main research area is hyperbranched silane modified alkyd resin polyurethane coating thermophys property.

The purpose of this paper is to introduce a new method for modification of alkyd resin by using 3-triethoxysilylpropyl succinic acid anhydride (TESP-SA) as the core material for low volatile organic components (VOCs) polyurethane coating applications. The structural, phys., thermal and film properties of the silane-modified (SM) alkyd were evaluated and compared with those of a silane-free alkyd resin that was prepared by a single-step method. The synthesis reaction was described in a detailed scheme and evidenced by ATR-FTIR measurements and 13C-NMR spectroscopy. As a result, environmentally friendly coatings with lower (VOC) emission are possible by using this type of alkyd polymer. The results showed that the presence of the Si atom in the final structure improved the thermal stability against the higher levels of aromatic rings in the silane-free alkyd. It was found that coatings based on SM alkyd have lower values of yellowing factor (Δa) and an increase of gloss retention percentage at different intervals of exposure to the quick UV weathering conditions. The synthesized SM alkyd resin provided a practical solution to obtain envi. friendly coatings with low VOC content, in addition to its improvement in alkyds’ overall characteristics, while still using natural resources – fatty acids – instead of totally petroleum resources. TESP-SA has not been used before in alkyd polymer modifications, and this study can help countries that are interested in using envi.-friendly coatings.

Pigment & Resin Technology published new progress about Acid number. 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

Bunce, Richard A.; Herron, Derrick M.; Johnson, Lara B.; Kotturi, Sharadsrikar V. published the artcile< Diastereoselective synthesis of substituted tetrahydroquinoline-4-carboxylic esters by a tandem reduction-reductive amination reaction>, Recommanded Product: Methyl 2-(2-nitrophenyl)acetate, the main research area is cyclization reduction nitrophenylpropanal; tandem reduction reductive amination nitrophenylpropanal; quinolinecarboxylate tetrahydro diastereoselective preparation; diastereoselective preparation tetrahydroquinolinecarboxylate.

A diastereoselective synthesis of cis-1-methyl-2-alkyl-1,2,3,4-tetrahydroquinoline-4-carboxylic acids and cis-2-alkyl-1,2,3,4-tetrahydroquinoline-4-carboxylic esters was developed from Me (2-nitrophenyl)acetate (I). The method involves alkylation of I with an allylic halide, ozonolysis of the double bond, and catalytic hydrogenation. The final hydrogenation initiates a tandem sequence involving reduction of the aromatic nitro group, condensation of the aniline or hydroxylamine nitrogen with the side chain carbonyl group, reduction of the resulting nitrogen intermediate, and reductive amination of the tetrahydroquinoline with formaldehyde produced in the ozonolysis to give a Me (±)-1-methyl-2-alkyl-1,2,3,4-tetrahydroquinoline-4-carboxylate. Removal of the formaldehyde prior to hydrogenation gives the simple (±)-2-alkyl derivatives The products were isolated in high yield as single diastereomers having the C-2 alkyl group cis to the C-4 carboxylic ester. The reaction was extended to the synthesis of tricyclic structures with similar high diastereoselection.

Journal of Organic Chemistry published new progress about Amination (intramol., stereoselective). 30095-98-8 belongs to class esters-buliding-blocks, and the molecular formula is C9H9NO4, Recommanded Product: Methyl 2-(2-nitrophenyl)acetate.

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