esters-buliding-blocks Archives - Page 1866 of 2796

Perrin, Charles L’s team published research in Journal of the American Chemical Society in 1978-08-02 | 112-63-0

Journal of the American Chemical Society published new progress about Anhydrides Role: SPN (Synthetic Preparation), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Synthetic Route of 112-63-0.

Perrin, Charles L.; Arrhenius, Thomas published the artcile< Malonic anhydride>, Synthetic Route of 112-63-0, the main research area is malonic anhydride; ozonolysis enol ester; isopropenyl acetate ozonolysis; diketene ozonolysis; glutaric anhydride.

The ozonolysis of enol esters was used to prepare several anhydrides. Thus, CH2:CMeOAc yielded Ac2O and I is converted into glutaric anhydride. Ozonolysis of diketene or II in CH2Cl2 at -78°C produced monomeric malonic anhydrides (I; R = H, Me, resp.). The latter are unstable and undergo cycloreversion near 0° to CO2 and R2C:C:O.

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

Li, Guangzhe’s team published research in Bioorganic & Medicinal Chemistry Letters in 2021-10-15 | 39987-25-2

Bioorganic & Medicinal Chemistry Letters published new progress about Antitumor agents. 39987-25-2 belongs to class esters-buliding-blocks, and the molecular formula is C6H12ClNO4, Related Products of 39987-25-2.

Li, Guangzhe; Shao, Yujie; Pan, Yue; Li, Yueqing; Wang, Yang; Wang, Liu; Wang, Xu; Shao, Kun; Wang, Shisheng; Liu, Naixuan; Zhang, Jingdong; Zhao, Weijie; Nakamura, Hiroyuki published the artcile< Total synthesis and biological evaluation of 7-hydroxyneolamellarin A as hypoxia-inducible factor-1α inhibitor for cancer therapy>, Related Products of 39987-25-2, the main research area is hydroxyneolamellarin antitumor agent HIF alpha inhibitor; 7-Hydroxyneolamellarin A; Anti-tumor; HIF-1α inhibition; Total synthesis.

7-Hydroxyneolamellarin A (7-OH-Neo A, 1), a natural marine product derived from sponge Dendrilla nigra, was first synthesized with 10% overall yield under the instruction of convergent synthetic strategy. We found that 7-Hydroxyneolamellarin A could attenuate the accumulation of hypoxia-inducible factor-1α (HIF-1α) protein and inhibit vascular epidermal growth factor (VEGF) transcriptional activity, showing well inhibitory effect on HIF-1 signaling pathway. Meantime, 7-Hydroxyneolamellarin A had the well anti-tumor activities, such as inhibiting tumor angiogenesis, proliferation, migration and invasion. More importantly, 7-Hydroxyneolamellarin A exhibited profound anti-tumor effect in mice breast cancer model by suppressing the accumulation of HIF-1α in tumor tissue. Mechanism study demonstrated that 7-Hydroxyneolamellarin A might target the protein with the ability of stabilizing HIF-1α in hypoxia. Due to the excellent water solubility, superior anti-tumor activity and good biocompatibility, 7-OH-Neo A shows the promising potential for being exploited as an anti-tumor agent in near future.

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

Jorgensen, Mikkel’s team published research in Journal of Organic Chemistry in 2004-10-01 | 112-63-0

Journal of Organic Chemistry published new progress about Acetals Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), PUR (Purification or Recovery), RCT (Reactant), SPN (Synthetic Preparation), PROC (Process), PREP (Preparation), 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.

Jorgensen, Mikkel; Krebs, Frederik C. published the artcile< Stepwise and Directional Synthesis of End-Functionalized Single-Oligomer OPVs and Their Application in Organic Solar Cells>, Electric Literature of 112-63-0, the main research area is stepwise oligomerization end functionalized oligomer phenylene vinylene solar cell.

A new stepwise directional synthetic route to single-oligomer p-phenylenevinylenes (OPVs) was developed. The 1st step in the reaction sequence is the condensation of a functionalized benzaldehyde with a novel monomer having a Me phosphonate ester group in one end and an acetal-protected aldehyde at the other end of a stilbene core. Oligomerization then proceeds stepwise by alternating reaction of the previous aldehyde-terminated OPV fragment with the monomer and deprotection of the acetal. Thus, OPVs with 3, 5, 7, 9, and 11 phenylene vinylene units were prepared that has an electron-donating methoxy group at one end and an electron-accepting aldehyde group at the other end. Some examples where a dimethylamino group replaced the methoxy group were also prepared The oligomer with seven phenylene vinylene units was then further derivatized at the aldehyde position to create OPVs with a range of substituents from strongly electron-accepting nitrophenyl to electron-donating methoxyphenyl. Photovoltaic cells were assembled with the synthesized OPVs as the photoactive layer. Illumination under simulated sunlight (AM1.5) gave short circuit currents (Isc) in the range 0.015-0.5 mA cm-2 and typical open circuit voltages (Voc) of 0.4-0.8 V. The maximum efficiency obtained was ∼0.1%.

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

Karunakaran, K’s team published research in Journal of Physical Organic Chemistry in 1996-02-29 | 112-63-0

Journal of Physical Organic Chemistry published new progress about Carboxylic acids Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or Reagent). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

Karunakaran, K.; Elango, K. P. published the artcile< Kinetics of oxidation of phenoxyacetic acids by pyridinium hydrobromide perbromide>, Category: esters-buliding-blocks, the main research area is kinetic mechanism oxidation phenoxyacetic acid; LFER oxidation phenoxyacetic acid; pyridinium hydrobromide perbromide oxidation phenoxyacetic acid; isotope effect oxidation phenoxyacetic acid.

The oxidation of several monosubstituted phenoxyacetic acids by pyridinium hydrobromide perbromide (PHPB) was studied in aqueous acetic acid. The reaction is first order with respect to PHPB. Michaelis-Menten-type kinetics are observed with respect to phenoxyacetic acids. The oxidation of [2,2-2H2]phenoxyacetic acid exhibits a substantial kinetic isotopic effect. The effect of solvent composition indicates that the transition state is more polar than the reactants. The formation constants of the intermediate phenoxyacetic acid-PHPB complexes and the rates of their decomposition were determined at different temperatures The rates of oxidation of para- and meta-substituted phenoxyacetic acids were correlated with Hammett’s substituent constants The ρ value is -2·59 at 35°. The rates of oxidation of ortho-substituted compounds are correlated with Charton’s triparametric equation. A mechanism involving transfer of a hydride ion from the substrate to the oxidant is proposed.

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

Pandey, Karuna Shanker’s team published research in Bioscience, Biotechnology, and Biochemistry in 1994-10-31 | 18729-20-9

Bioscience, Biotechnology, and Biochemistry published new progress about Blattella germanica. 18729-20-9 belongs to class esters-buliding-blocks, and the molecular formula is C7H12O3, Name: Methyl tetrahydro-2H-pyran-3-carboxylate.

Pandey, Karuna Shanker; Shriprakash; Pandey, Mamta; Rao, Karumuru Mallikarjuna; Vaidyanathaswamy, Ramamoorthy published the artcile< Synthesis and resolution of tetrahydropyran carboxylic acids and the bioevaluation of their esters as cockroach attractants>, Name: Methyl tetrahydro-2H-pyran-3-carboxylate, the main research area is tetrahydropyrancarboxylate attractant cockroach.

Tetrahydropyran-2- and 3-carboxylic acids were resolved by using quinine. The enantiomeric purity of the corresponding Me esters (I and II) was determined by proton NMR, using a lanthanide chiral shift reagent [Eu(hfc)3] in the ratio 1:3 (substrate/shift reagent). The relative attractant activity of the racemic, and (+) and (-) isomers of these esters was evaluated against Blattella germanica (L.) and Supella longipalpa (F.). The results show that the activity order for I was (-) > (+) > racemic, and for II was (+) > (-) > racemic.

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

Shimizu, Junji’s team published research in Frontiers in Immunology in 2022 | 347174-05-4

Frontiers in Immunology published new progress about Apoptosis. 347174-05-4 belongs to class esters-buliding-blocks, and the molecular formula is C15H22N2O2, Reference of 347174-05-4.

Shimizu, Junji; Murao, Atsushi; Nofi, Colleen; Wang, Ping; Aziz, Monowar published the artcile< Extracellular CIRP promotes GPX4-mediated ferroptosis in sepsis>, Reference of 347174-05-4, the main research area is ferroptosis eCIRP therapeutic target inflammation sepsis; GPX4; acute lung injury; eCIRP; ferroptosis; lung; macrophage; sepsis.

Sepsis is characterized by life-threatening organ dysfunction caused by a dysregulated host response to infection. Extracellular cold-inducible RNA-binding protein (eCIRP) is a damage-associated mol. pattern (DAMP) that promotes inflammation and induces cell death via apoptosis, NETosis, and/or pyroptosis. Ferroptosis is a form of regulated cell death characterized by the accumulation of lipid peroxide on cellular membranes. We hypothesize that eCIRP induces ferroptosis in macrophages and lung tissue during sepsis. RAW 264.7 cells stimulated with recombinant murine (rm) CIRP significantly decreased the expression of glutathione peroxidase 4 (GPX4), a neg. regulator of ferroptosis, and increased lipid reactive oxygen species (ROS) in a TLR4 dependent manner. In TLR4-/- peritoneal macrophages, depression of GPX4 expression and increase in lipid ROS levels were attenuated after rmCIRP-treatment compared to WT macrophages. rmCIRP also induced cell death in RAW 264.7 cells which was corrected by the ferroptosis inhibitor, ferrostatin-1 (Fer-1). I.p. injection of rmCIRP decreased GPX4 expression and increased lipid ROS in lung tissue, whereas the increase of lipid ROS was reduced by Fer-1 treatment. GPX4 expression was significantly decreased, while malondialdehyde (MDA), iron levels, and injury scores were significantly increased in lungs of WT mice after cecal ligation and puncture (CLP)-induced sepsis compared to CIRP-/- mice. Treatment with C23, a specific eCIRP inhibitor, in CLP mice alleviated the decrease in GPX4 and increase in MDA levels of lung tissue. These findings suggest that eCIRP induces ferroptosis in septic lungs by decreasing GPX4 and increasing lipid ROS. Therefore, regulation of ferroptosis by targeting eCIRP may provide a new therapeutic approach in sepsis and other inflammatory diseases.

Frontiers in Immunology published new progress about Apoptosis. 347174-05-4 belongs to class esters-buliding-blocks, and the molecular formula is C15H22N2O2, Reference of 347174-05-4.

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

Lopes, S.’s team published research in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy in 2020 | CAS: 623-47-2

Ethyl propiolate(cas: 623-47-2) is a clear colorless to pale yellow liquid that is soluble in ethanol, ether and chloroform. It an important organic chemical raw material and pharmaceutical intermediate. Ethyl propargylate is obtained by oxidation of propargyl alcohol to propargylic acid followed by esterification.Product Details of 623-47-2

《Structural, spectroscopic, and photochemical study of ethyl propiolate isolated in cryogenic argon and nitrogen matrices》 was written by Lopes, S.; Nikitin, T.; Fausto, Rui. Product Details of 623-47-2 And the article was included in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy in 2020. The article conveys some information:

Et propiolate (HC ≃ CCOOCH2CH3, EP) was studied exptl. by IR spectroscopy in argon and nitrogen cryomatrices (15 K) and by quantum chem. calculations (at the DFT(B3LYP) and MP2 levels of theory). Calculations predict the existence of four conformers: two low-energy conformers (I and II) possessing the carboxylic moiety in the cis configuration (O=C-O-C dihedral equal to ∼0°) and two higher-energy trans forms (O=C-O-C dihedral equal to ∼180°; III and IV). The conformation of the Et ester group within each pair of conformers is either anti (C-O-C-C equal to 180°; in conformers I and III) or gauche (C-O-C-C equal to ±86.6° in II, and ± 92.5° in IV). The two low-energy cis conformers (I and II) were predicted to differ in energy by less than 2.5 kJ mol-1 and were shown to be present in the studied cryogenic matrixes. Characteristic bands for each one of these conformers were identified in the IR spectra of the matrix-isolated compound and assigned taking into account the results of normal coordinate anal., which used the geometries and harmonic force constants obtained in the DFT calculations The two trans conformers (III and IV) were estimated to be 17.5 kJ mol-1 higher in energy than the conformational ground state (form I) and were not observed exptl. The unimol. photochem. of matrix-isolated EP (in N2 matrix) was also investigated. In situ irradiation with UV light (λ > 235 nm) leads mainly to decarbonylation of the compound, with generation of ethoxyethyne, which in a subsequent photoreaction generates ketene (plus ethene). After reading the article, we found that the author used Ethyl propiolate(cas: 623-47-2Product Details of 623-47-2)

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

Chaitra, Turuvekere K.’s team published research in Journal of the Taiwan Institute of Chemical Engineers in 2016 | CAS: 16982-21-1

Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1) belongs to anime. Acylation is one of the most important reactions of primary and secondary amines; a hydrogen atom is replaced by an acyl group (a group derived from an acid, such as RCOOH or RSO3H, by removal of ―OH, such as RC(=O)―, RS(O)2―, and so on). Reagents may be acid chlorides (RCOC1, RSO2C1), anhydrides ((RCO)2O), or even esters (RCOOR′); the products are amides of the corresponding acids.SDS of cas: 16982-21-1

In 2016,Chaitra, Turuvekere K.; Mohana, Kikkeri N.; Gurudatt, Doddahosuru M.; Tandon, Harmesh C. published 《Inhibition activity of new thiazole hydrazones towards mild steel corrosion in acid media by thermodynamic, electrochemical and quantum chemical methods》.Journal of the Taiwan Institute of Chemical Engineers published the findings.SDS of cas: 16982-21-1 The information in the text is summarized as follows:

The mild steel anti-corrosion potential by newly synthesized thiazole hydrazones, 4-(4-methoxy-phenyl)-thiazole-2-carboxylic acid benzylidene-hydrazide (TH-1), 4-(4-methoxy-phenyl)-thiazole-2-carboxylic acid (3-hydroxy-benzylidene)-hydrazide (TH-2) and 4-(4-methoxy-phenyl)-thiazole-2-carboxylic acid (4-hydroxy-benzylidene)-hydrazide (TH-3) in 0.5 M hydrochloric acid was studied by gravimetric and electrochem. techniques. Thermodn. parameters were evaluated for activation and adsorption processes. Adsorption of the inhibitors followed Langmuir isotherm. Electrochem. measurements showed that addition of inhibitors simultaneously decreased corrosion c.d. and double layer capacitance but increased charge transfer resistance. Potentiodynamic polarization studies revealed that thiazole hydrazones effectively suppressed both the anodic and cathodic processes of mild steel corrosion in acid solution and hence acted as mixed-type inhibitors. Quantum chem. parameters like EHOMO, ΔE, softness and hardness were very well correlated with exptl. data. SEM characterized the film formed on the mild steel. In addition to this study using Ethyl 2-amino-2-thioxoacetate, there are many other studies that have used Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1SDS of cas: 16982-21-1) was used in this study.

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

Gaikwad, Sudhakar A.’s team published research in Phosphorus, Sulfur and Silicon and the Related Elements in 2010 | CAS: 16982-21-1

Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1) belongs to anime. Amines have a free lone pair with which they can coordinate to metal centers. Amine–metal bonds are weaker because amines are incapable of backbonding, but they are still important for sensing applications.While stronger than hydrogen bonds, amine–metal bonds are still weaker than both covalent and ionic bonds.COA of Formula: C4H7NO2S

In 2010,Gaikwad, Sudhakar A.; Patil, Amol A.; Deshmukh, Madhukar B. published 《An efficient, uncatalyzed, and rapid synthesis of thiazoles and aminothiazoles under microwave irradiation and investigation of their biological activity》.Phosphorus, Sulfur and Silicon and the Related Elements published the findings.COA of Formula: C4H7NO2S The information in the text is summarized as follows:

A convenient method for the synthesis of thiazoles by treatment of α-bromoketones with thioamides (Hantzsch synthesis) in the absence of catalysts under microwave irradiation was developed. The products were formed rapidly in excellent yields. An efficiency comparison of time, yield, and effort clearly proved the microwave technique to be superior. The structures of the newly synthesized compounds were characterized by spectroscopic data and elemental analyses. The synthesized compounds were tested for their biol. activity. Depending on the substituents, some of the thiazoles exhibit very good antibacterial or antifungal activity. In the experiment, the researchers used Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1COA of Formula: C4H7NO2S)

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

Kashid, G. A.’s team published research in International Journal of Pharmaceutical Sciences and Research in 2018 | CAS: 16982-21-1

Product Details of 16982-21-1In 2018 ,《Synthesis and QSAR study of novel thiazole moieties having antioxidant activity》 was published in International Journal of Pharmaceutical Sciences and Research. The article was written by Kashid, G. A.; Singh, S. K.; Saravanan, J.. The article contains the following contents:

Thiazoles derivatives are an important class of heterocyclic compounds, reported to possess a wide spectrum of biol. activities. Moreover, thiazole nucleus occupies a very important place in the field of antioxidant agents. The above observations prompted us to synthesize some novel thiazole derivatives with various substitutions at along with heterocyclic rings in the same framework for synergistic action. We here in report the synthesis, antioxidant screening & QSAR studies of the new title compounds Concentrated research on N-((Substituted) benzylidene)-4-(4-chlorophenyl) thiazole-2-carbohydrazides I [R = 4-Cl; R1 = 4-Me, 4-Cl, 3-nitro, etc.] & were synthesized, screened for antioxidant activities & QSAR studies. All new entities have good yield and results. From antioxidant activity results, it was observed that the compounds with both electron donating and electron withdrawing groups on the aldehydic Ph ring influenced the activity. Among all the compounds, compounds I [R = 4-Cl, R1 = 4-hydroxy-3-methoxy, 3,4,5-trihydroxy, 4-methoxy, 4-Cl, 4-hydroxy] showed the good % inhibition and were found to be more significant compound among all the compounds tested. Compounds GS-5i-j were showed moderate % inhibition and were found to be significant among all the tested compounds 2D & 3D-QSAR models with moderate to high predictive ability of thiazole derivatives were derived. The role of hydrophobicity as a 3D property was confirmed and also electrostatic and steric effects were found to contribute to antioxidant activity. The experimental process involved the reaction of Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1Product Details of 16982-21-1)

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