Category: esters-buliding-blocks

Wood, David K.; Weingeist, David M.; Bhatia, Sangeeta N.; Engelward, Bevin P. published the artcile< Single cell trapping and DNA damage analysis using microwell arrays>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is single cell trapping DNA damage microwell array.

With a direct link to cancer, aging, and heritable diseases as well as a critical role in cancer treatment, the importance of DNA damage is well-established. The intense interest in DNA damage in applications ranging from epidemiol. to drug development drives an urgent need for robust, high throughput, and inexpensive tools for objective, quant. DNA damage anal. We have developed a simple method for high throughput DNA damage measurements that provides information on multiple lesions and pathways. Our method utilizes single cells captured by gravity into a microwell array with DNA damage revealed morphol. by gel electrophoresis. Spatial encoding enables simultaneous assays of multiple exptl. conditions performed in parallel with fully automated anal. This method also enables novel functionalities, including multiplexed labeling for parallel single cell assays, as well as DNA damage measurement in cell aggregates. We have also developed 24- and 96-well versions, which are applicable to high throughput screening. Using this platform, we have quantified DNA repair capacities of individuals with different genetic backgrounds, and compared the efficacy of potential cancer chemotherapeutics as inhibitors of a critical DNA repair enzyme, human AP endonuclease. This platform enables high throughput assessment of multiple DNA repair pathways and subpathways in parallel, thus enabling new strategies for drug discovery, genotoxicity testing, and environmental health.

Proceedings of the National Academy of Sciences of the United States of America published new progress about Computer program (comet anal. pipeline). 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

Futagawa, Tohru; Nishiyama, Norio; Tai, Akira; Okuyama, Tadashi; Sugimura, Takashi published the artcile< Preparation of gem-dimethylcyclopropane-fused compounds through sigmatropic rearrangements. On/off-switching of the tautomerization of 3,4-homotropylidene by steric hindrance>, Related Products of 112-63-0, the main research area is gem dimethylcyclopropane fused sigmatropic rearrangement switching tautomerization homotropylidene; steric hindrance valence tautomerization.

Cyclopropanation of 4,8,8-trimethylcycloheptatriene having an ether function at the 3-position by unsubstituted carbenoid addition resulted in a complex mixture mainly due to quick valence tautomerization of the produced 3,4-homotropylidene analog during the reaction. Dihalocarbene addition to the same substrate proceeded exclusively at the 3,4-position to give an adduct, where the tautomerization process was interrupted by steric hindrance caused by the halogen substituents. Removal of the halogen atoms by reduction promotes the tautomerization to give a gem-dimethylcyclopropane-fused product. Stereospecificity of the tautomerization was also demonstrated by obtaining the product in an optically pure state.

Tetrahedron published new progress about AM1 (molecular orbital method). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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

Mullah, Nasreen N.; Sopchik, Alan E.; Bentrude, Wesley G. published the artcile< Effect on chair-chair equilibrium of 3-substituted-1,3,2-oxazaphosphorinanes of replacement of Me2N substituent on phosphorus by isoPr2N>, Application of C19H34O2, the main research area is substituent effect conformation dioxaphosphorinane; NMR substituent effect conformation dioxaphosphorinane.

The chair-chair conformational equilibrium (A (I) ⇌ B (II)) (R = Ph, Me, isoPr; R1 = H, Me) of 1,3,2-dioxaphosphorinanes featuring three-coordinated P substituted with an isoPr2N group (1-6) were studied by 1H NMR spectroscopy. Compared to the analogous series with an Me2N group on P, 1-6 populate the chair conformation B with R2N equatorial to a greater extent. This is interpreted to mean that conformer A is more destabilized by a greater steric size of isoPr2N than is conformer B. Thus, the repulsive interactions between equatorial Me2N and the substituent on N3, believed to be responsible for depopulation of B that result in an unexpectedly high population of A with Me2N on P, is overcome by destabilization of A by the axial isoPr2N. The apparent size effect of substituents on N3 in destabilization of B follows the order Ph > isoPr > Me, as observed earlier for the series with Me2N group on P.

Heteroatom Chemistry published new progress about Conformation. 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

Liu, Jin; Cai, Xuhong; Liu, Junbo; Liang, Dadong; Chen, Kaiyin; Tang, Shanshan; Xu, Bao published the artcile< Study on the Preparation of Estrone Molecularly Imprinted Polymers and Their Application in a Quartz Crystal Microbalance Sensor via a Computer-Assisted Design>, Synthetic Route of 3290-92-4, the main research area is estrone estriol MIPs itaconic acid quartz crystal microbalance sensor; computational design; estrone; molecularly imprinted polymers; quartz crystal microbalance; selectivity.

Computer simulations are widely used for the selection of conditions for the synthesis of molecularly imprinted polymers and can rapidly reduce the exptl. cycle time and save labor and materials. In this paper, estrone molecularly imprinted polymers (E1-MIPs) are designed at the M062X/6-311+G(d,p) level with itaconic acid (IA) as the functional monomer. The imprinted molar ratio between E1 and IA was optimized, cross-linkers and solvents were screened, and the nature of interactions between E1 and IA was explored. The simulated results showed that pentaerythritol triacrylate was the best cross-linker. Meanwhile, when the imprinted molar ratio between E1 and IA was 1:4, the E1-IA complex had the largest amount of hydrogen bonds, the lowest binding energy, and the strongest stability. Using the simulation results as guidance, the E1-MIPs were prepared to modify the electrons of a quartz crystal microbalance (QCM) sensor. The exptl. studies showed that the E1-MIPs-QCM sensor had the highest adsorption capacity to E1 in comparison with their analogs, and the lowest detection value of the sensor was 16.00 μg/L. The computer simulations and exptl. studies could provide guidance for synthesize novel E1-MIPs materials. It also could provide important references and directions for the application of E1-MIPs.

International Journal of Molecular Sciences published new progress about Adsorption. 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Synthetic Route of 3290-92-4.

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

Temburnikar, Kartik W.; Ross, Christina R.; Wilson, Gerald M.; Balzarini, Jan; Cawrse, Brian M.; Seley-Radtke, Katherine L. published the artcile< Antiproliferative activities of halogenated pyrrolo[3,2-d]pyrimidines>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is halogenated pyrrolo pyrimidine derivative preparation antitumor cancer; Apoptosis; Cell cycle arrest; Cytostatic; Heterocyclic chemistry; Thieno[3,2-d]pyrimidine.

In vitro evaluation of the halogenated pyrrolo[3,2-d]pyrimidines identified antiproliferative activities in compounds 1 and 2 against four different cancer cell lines. Upon screening of a series of pyrrolo[3,2-d]pyrimidines, the 2,4-Cl compound 1 was found to exhibit antiproliferative activity at low micromolar concentrations Introduction of iodine at C7 resulted in significant enhancement of potency by reducing the IC50 into sub-micromolar levels, thereby suggesting the importance of a halogen at C7. This finding was further supported by an increased antiproliferative effect for 4 as compared to 3. Cell-cycle and apoptosis studies conducted on the two potent compounds 1 and 2 showed differences in their cytotoxic mechanisms in triple neg. breast cancer MDA-MB-231 cells, wherein compound 1 induced cells to accumulate at the G2/M stage with little evidence of apoptotic death. In contrast, compound 2 robustly induced apoptosis with concomitant G2/M cell cycle arrest in this cell model.

Bioorganic & Medicinal Chemistry published new progress about Antiproliferative agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Crich, David; Fortt, Simon M. published the artcile< Studies on 6,7-unsaturated carbonyl radical cyclizations>, Category: esters-buliding-blocks, the main research area is selenol ester radical cyclization regiochem; ring closure radical unsaturated silenol ester; carbonyl radical unsaturated ring closure; cyclohexanone; cycloheptanone; alkyloxy selenol ester radical cyclization.

6,7-Unsaturated carbonyl radicals, generated by the action of Bu3SnH on the corresponding selenol esters, cyclize to give either cyclohexanones or cycloheptanones, depending on the nature and position of the substituents in the hydrocarbon chain. Thus, cyclization of PhSeCOCH2CHRCH2CHR1CH:CH2 (I, R = H, R1 = OEt) with Bu3SnH gave 27% cycloheptanone II, while I (R = OSiPh2CMe3, R1 = H) gave 57% cyclohexanone III and 17% cycloheptanone II. In all cases, uncyclized aldehydes were isolated as byproducts. Allyloxy selenol esters cyclized similarly to give oxacyclohexanones and oxacyclaheptanones.

Tetrahedron Letters published new progress about Cyclization. 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

Manaila, Elena; Craciun, Gabriela; Ighigeanu, Daniel; Lungu, Ion Bogdan; Dumitru, Marius; Stelescu, Maria Daniela published the artcile< Electron beam irradiation: a method for degradation of composites based on natural rubber and plasticized starch>, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate), the main research area is natural rubber plasticized starch composite electron beam irradiation degradation; phys structural morphol mech property; degradation; electron beam; filler; natural rubber; plasticized starch.

Polymeric composites based on natural rubber (NR) and plasticized starch (PS) obtained by peroxide crosslinking have been subjected to electron beam irradiation in order to investigate their degradation The amount of PS ranged from 10 to 50 phr and the irradiation dose from 150 to 450 kGy. Irradiation was performed in atm. conditions using a linear electron accelerator of 5.5 MeV. Changes in chem., phys., structural, and morphol. properties of composites were correlated with variables, such as PS loading and irradiation dose. Thus, mech. properties, gel fraction, crosslinking degree, water uptake, weight loss in toluene/water were compared with those obtained before irradiation The changes in structure and morphol. were studied by Fourier transform IR spectroscopy and SEM. Both PS loading and irradiation dose were found to be responsible for the degradation installing. Moreover, it has been shown that at the dose of 450 kGy, chain scission is dominant over crosslinking.

Polymers (Basel, Switzerland) published new progress about Absorption (water). 3290-92-4 belongs to class esters-buliding-blocks, and the molecular formula is C18H26O6, Recommanded Product: 2-Ethyl-2-((methacryloyloxy)methyl)propane-1,3-diyl bis(2-methylacrylate).

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

Pazy, Yael; Kulik, Tikva; Bayer, Edward A.; Wilchek, Meir; Livnah, Oded published the artcile< Ligand exchange between proteins: exchange of biotin and biotin derivatives between avidin and streptavidin>, HPLC of Formula: 112-63-0, the main research area is ligand exchange protein biotin derivative avidin streptavidin.

We have studied the structural elements that affect ligand exchange between the two high affinity biotin-binding proteins, egg white avidin and its bacterial analog, streptavidin. For this purpose, we have developed a simple assay based on the antipodal behavior of the two proteins toward hydrolysis of biotinyl p-nitrophenyl ester (BNP). The assay provided the exptl. basis for these studies. It was found that biotin migrates unidirectionally from streptavidin to avidin. Conversely, the biotin derivative, BNP, is transferred in the opposite direction, from avidin to streptavidin. A previous crystallog. study provided insight into a plausible explanation for these results. These data revealed that the non-hydrolyzable BNP analog, biotinyl p-nitroanilide, was almost completely sheltered in streptavidin as opposed to avidin in which the disordered conformation of a critical loop resulted in the loss of several hydrogen bonds and concomitant exposure of the analog to the solvent. In order to determine the minimal modification of the biotin mol. required to cause the disordered loop conformation, the structures of avidin and streptavidin were determined with norbiotin, homobiotin, and a common long-chain biotin derivative, biotinyl ε-aminocaproic acid. Six new crystal structures of the avidin and streptavidin complexes with the latter biotin analogs and derivatives were thus elucidated. It was found that extending the biotin side chain by a single CH2 group (i.e. homobiotin) is sufficient to result in this remarkable conformational change in the loop of avidin. These results bear significant biotechnol. importance, suggesting that complexes containing biotinylated probes with streptavidin would be more stable than those with avidin. These findings should be heeded when developing new drugs based on lead compounds because it is difficult to predict the structural and conformational consequences on the resultant protein-ligand interactions.

Journal of Biological Chemistry published new progress about Avidins Role: BSU (Biological Study, Unclassified), PRP (Properties), BIOL (Biological Study). 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

Uvyn, Annemiek; De Coen, Ruben; Gruijs, Mandy; Tuk, Cees W.; De Vrieze, Jana; van Egmond, Marjolein; De Geest, Bruno G. published the artcile< Efficient Innate Immune Killing of Cancer Cells Triggered by Cell Surface Anchoring of Multivalent Antibody-Recruiting Polymers>, Category: esters-buliding-blocks, the main research area is multivalent antibody recruiting polymer cancer cytolysis macrophage phagocytosis; antibodies; cancer; immune therapy; multivalency; polymer amphiphiles.

Binding of monoclonal antibodies (mAbs) onto a cell surface triggers antibody-mediated effector killing by innate immune cells through complement activation. As an alternative to mAbs, synthetic systems that can recruit endogenous antibodies from the blood stream to a cancer cell surface could be of great relevance. Herein, we explore antibody-recruiting polymers (ARPs) as a novel class of immunotherapy. ARPs consist of a cell-binding motif linked to a polymer that contains multiple small mol. antibody-binding motifs along its backbone. As a proof of concept, we employ a lipid anchor that inserts into the phospholipid cell membrane and make use of a polymeric activated ester scaffold onto which we substitute dinitrophenol as an antibody-binding motif. We demonstrate that ARPs allow for high avidity antibody binding and drive antibody recruitment to treated cells for several days. Furthermore, we show that ARP-treated cancer cells are prone to antibody-mediated killing through phagocytosis by macrophages.

Angewandte Chemie, International Edition published new progress about Antibodies and Immunoglobulins Role: BSU (Biological Study, Unclassified), THU (Therapeutic Use), BIOL (Biological Study), USES (Uses). 71195-85-2 belongs to class esters-buliding-blocks, and the molecular formula is C9H3F5O2, Category: esters-buliding-blocks.

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

Weidener, Dennis; Singh, Kawarpal; Bluemich, Bernhard published the artcile< Synthesis of α-fluoro-α,β-unsaturated esters monitored by 1D and 2D benchtop NMR spectroscopy>, SDS of cas: 94-02-0, the main research area is fluoropropenoate preparation activation energy deprotonation deacylation kinetics mechanism; compact NMR spectrometer; deacylation; deprotonation; flow NMR; reaction monitoring.

For optimization and control of pharmaceutically and industrially important reactions, chem. information is required in real time. Instrument size, handling, and operation costs are important criteria to be considered when choosing a suitable anal. method apart from sensitivity and resolution This present study explores the use of a robust and compact NMR spectrometer to monitor the stereo-selective formation of α-fluoro-α,β-unsaturated esters from α-fluoro-β-keto esters via deprotonation and deacylation in real time. These compounds are precursors of various pharmaceutically active substances. The real-time study revealed the deprotonation and deacylation steps of the reaction. The reaction was studied at temperatures ranging from 293 to 333 K by interleaved one-dimensional 1H and 19F and two-dimensional 1H-1H COSY experiments The kinetic rate constants were evaluated using a pseudo first-order kinetic model. The activation energies for the deprotonation and deacylation steps were determined to 28 ± 2 and 63.5 ± 8 kJ/mol, resp. This showed that the deprotonation step is fast compared with the deacylation step and that the deacylation step determines the rate of the overall reaction. The reaction was repeated three times at 293 K to monitor the repeatability and stability of the system. The compact NMR spectrometer provided detailed information on the mechanism and kinetics of the reaction, which is essential for optimizing the synthetic routes for stepwise syntheses of pharmaceutically active substances.

Magnetic Resonance in Chemistry published new progress about Activation energy. 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, SDS of cas: 94-02-0.

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