Category: esters-buliding-blocks

Boger, Dale L.; Panek, James S. published the artcile< Preparation of (R)-(+)- and (S)-(-)-4-iodo-1,2-epoxybutane [(R)- and (S)-(2-iodoethyl)oxirane], useful chiral synthons>, Recommanded Product: (S)-Dimethyl 2-hydroxysuccinate, the main research area is iodoepoxybutane stereoselective preparation; epoxybutane iodo stereoselective preparation; malic acid reduction; butanetriol base catalyzed ring closure; iodoethyloxirane stereoselective preparation; oxirane iodoethyl stereoselective preparation.

S-Epoxybutane I (R = iodo) was prepared by LiAlH4 reduction of S-R1CH2CH(OR2)R1 (II; R1 = MeO2C, R2 = 2-tetrahydropyranyl) followed by mesylation and hydrolysis to give S-II (R1 = CH2OSO2Me, R2 = H) which was treated with K2CO3 to give S-I (R = OSO2Me) which was then iodinated by NaI. Reduction of S-II (R1 = CO2Me, R2 = MeOCMe2) followed by acetylation in the presence of 4-dimethylaminopyridine gave S-II (R1 = AcOCH2) (III). III was hydrolyzed and then mesylated to give S-II (R2 = OSO2Me) which was treated with K2CO3 and MeOSO2Cl to give R-I (R = CH2OSO2Me) (IV). Treating IV with NaI at 25° gave R-I (R = iodo).

Journal of Organic Chemistry published new progress about 617-55-0. 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Recommanded Product: (S)-Dimethyl 2-hydroxysuccinate.

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

Da Silva, Marcio Jose; Chaves, Diego Morais; Teixeira, Milena Galdino; Oliveira Bruziquesi, Carlos Giovani published the artcile< Esterification of levulinic acid over Sn(II) exchanged Keggin heteropolyacid salts: An efficient route to obtain bioadditives>, Formula: C19H34O2, the main research area is esterification levulinate tin exchanged Keggin heteropolyacid bioadditive.

In this paper, we describe a process to add value to the biomass derivatives (i.e., levulinic acid), converting it to bioadditives over solid Sn(II) exchanged Keggin heteropolyacid salts. These solid catalysts are an attractive alternative to the traditional soluble and corrosive Bronsted acid catalysts. Among Sn(II) heteropoly salts, the Sn1.5PW12O40 was the most active and selective catalyst, achieving high conversions (ca. 90%) and selectivity (90-97%) for alkyl esters and angelica lactone, the main reaction products. The impacts of the main reaction parameters (i.e., catalyst load, temperature, and the molar ratio of alc. to acid) were investigated. The use of renewable raw material, and an efficient and recyclable catalyst are the main pos. features of this process. The Sn1.5PW12O40 catalyst was easily recovered and reused without loss activity.

Molecular Catalysis published new progress about Esterification. 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

Rauter, Michael T.; Augustin, Matthias; Spitthoff, Lena; Svensson, Ann Mari published the artcile< Product formation during discharge: a combined modelling and experimental study for Li-O2 cathodes in LiTFSI/DMSO and LiTFSI/ TEGDME electrolytes>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is lithium bistrifluoromethanesulfonylimide dimethylsulfoxide tetraethylene glycol dimethyl ether electrolyte cathode.

Li-air or Li-O2 batteries are a promising energy storage technol. due to the potentially high energy d. However, significant challenges related to reversible charge/discharge of these cells need to be solved. The discharge reaction is generally agreed to proceed via two main routes, which may occur simultaneously. These are the surface mechanism, leading to Li2O2 product formation as surface films, or the solution mechanism, with solid particles formed in the pore structure of the cathode. A detailed understanding of the reaction mechanisms and the dynamic performance of the electrodes is key to further improvements. Here, we present a math. model for the discharge process, based on porous electrode theory, including effects of reactant transport and kinetic limitations, as well as the continuous change of properties due to the formation of reaction products via the solution mechanism and the surface mechanism. The model describes the dynamic change in the ratio of the surface and solution mechanism as a function of growth of film thickness, in line with recent findings. The model is able to predict the differences in exptl. obtained discharge curves between DMSO and tetra ethylene glycol di-Me ether solvents with 1M LiTFSI, with a min. of free parameters. The model parameters are based on phys. characterization of the materials and the electrodes, or determined by fitting to impedance spectra recorded during the discharge. The developed model and the methodol. will provide a powerful tool for optimization of such electrodes.

Journal of Applied Electrochemistry published new progress about Battery cathodes. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Zheng, Liyou; Guo, Hongyan; Xie, Liangliang; Korma, Sameh A.; Jin, Jun; Jin, Qingzhe; Cacciotti, Ilaria published the artcile< Kinetic and thermodynamic studies of tocored thermal degradation in lipid systems with various degrees of unsaturation>, Reference of 112-63-0, the main research area is tocored thermal degradation lipid thermodn kinetics degree of unsaturation.

γ-Tocopherol-5,6-quinone (tocored) is a crucial minor component of edible oils. It has been certified to endow oils with an orange-red color and antioxidant activity. The tocored performance in lipid systems when exposed to heat should be investigated. Thus, the kinetics and thermodn. of tocored degradation in lipid systems with various degrees of unsaturation (Me palmitate, MP; Me oleate, MO; and Me linoleate, ML) were studied over a temperature range of 90-120°C. Tocored degradation probably followed zero-order kinetics, where the rate constant (3.22-24.59 and 23.18-299.2 mg kg-1 h-1 for MO and ML, resp.) significantly increased with increasing temperature (p < 0.05). The activation energy (Ea) values for the tocored degradation in MO and ML were 74.50 and 99.16 kJ mol-1, resp. Considering the thermodn. parameters (ΔH++>0, ΔS++<0, and ΔG++>0), the process both in MO and ML was endothermic and nonspontaneous. Above all, the kinetics and thermodn. data extend the knowledge on the tocored stability in oily systems, which is of vital importance for further oil industrial processing.

LWT–Food Science and Technology published new progress about Activation energy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.

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

Lin, Yu; Li, Zhanhui; Xu, Chen; Xia, Kaijiang; Wu, Shuwei; Hao, Yongjin; Yang, Qing; Ma, Haikuo; Zheng, Jiyue; Luo, Lusong; Zhu, Fang; He, Sudan; Zhang, Xiaohu published the artcile< Design, synthesis, and evaluation of novel CXCR4 antagonists based on an aminoquinoline template>, Category: esters-buliding-blocks, the main research area is CXCR4 antagonists chemokine CXCL12 GPCR aminoquinoline binding affinity migration; Aminoquinoline; Antagonist; CXCL12; CXCR4; Chemokine; GPCR.

The chemokine receptor CXCR4 has been explored as a drug target due to its involvement in pathol. conditions such as HIV infection and cancer metastasis. Here we report the structure-activity relationship study of novel CXCR4 antagonists based on an aminoquinoline template. This template is devoid of the chiral center in the classical tetrahydroquinoline (THQ) ring moiety and therefore can be easily synthesized. A number of potent CXCR4 antagonists were identified, exemplified by compound 3(I), which demonstrated excellent binding affinity with CXCR4 receptor (IC50 = 57 nM) and inhibited CXCL12 induced cytosolic calcium increase (IC50 = 0.24 nM). Furthermore, compound 3 potently inhibited CXLC12/CXCR4 mediated cell migration in a transwell invasion assay. The simplified synthetic approach combined with good physicochem. properties (e.g. MW 362, clogP 2.1, PSA 48, pKa 7.0 for compound 3) demonstrate the potential of this aminoquinoline template as a novel scaffold to develop CXCR4 antagonists.

Bioorganic Chemistry published new progress about Cell migration. 60705-25-1 belongs to class esters-buliding-blocks, and the molecular formula is C7H12O5, Category: esters-buliding-blocks.

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

Melfi, Diego Trevisan; Carvalho dos Santos, Kallynca; Ramos, Luiz Pereira; Corazza, Marcos Lucio published the artcile< Supercritical CO2 as solvent for fatty acids esterification with ethanol catalyzed by Amberlyst-15>, SDS of cas: 112-63-0, the main research area is carbon dioxide Amberlyst esterification catalyst fatty acid ethanol.

This work reports on the esterification of fatty acids with ethanol using Amberlyst-15 in a scCO2-assisted system. A factorial design was carried out for the following process variables: temperature (70°C-110°C), ethanol to acid molar ratio (3:1 to 9:1) and catalyst to acid concentration (5-20 wt%), with a fixed amount of CO2 added to the reactor (28.62 g). The best reaction condition led to an 87% conversion at 110°C, 9:1, and 20 wt% in 15 min of reaction time. An exploratory kinetic study illustrates the effect of catalyst amount and molar ratio in isothermal kinetic curves. Also, a catalyst reuse study was performed. Addnl., different carboxylic acids and methanol, instead of ethanol, were evaluated as reagents. At all proposed systems, the addition of scCO2 increased the reaction conversion.

Journal of Supercritical Fluids published new progress about Esterification. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, SDS of cas: 112-63-0.

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

Zhao, Ning; Zhou, Peng; Berova, Nina; Nakanishi, Koji published the artcile< Combined synthetic/CD strategy for the preparation and configurational assignments of model acyclic 1,3-polyols with a 1,2-diol terminal>, Category: esters-buliding-blocks, the main research area is CD spectra library configuration alditol; alditol preparation mol structure configuration.

Acyclic 1,3-polyols or skipped polyols are widely distributed in nature. Particularly skipped 1,3-polyols with a terminal 1,2-diol group are present in numerous antifungal polyene macrolides in various masked forms.’. Although over 200 polyene macrolides are known, the planar structures of only about 40 have been determined, while those for which the full stereochem. has been elucidated is less than ten. No simple method exists for configurational assignments of the 1,3-polyols moieties; moreover, this class of compounds are difficult to crystallize. In order to develop a general chiroptical method for structure determination of acyclic 1,3-polyols, we have combined a divergent synthetic approach with CD to prepare all possible stereoisomers of 1,2,4-triols, 1,2,4,6-tetrols and 1,2,4,6,8-pentols. The current set of reference polyols should be useful for setting up reference CD libraries and for model studies leading to a general method for configurational assignment of acyclic polyols. This strategy can be used to synthesize further extended members of acrylic 1,3-polyols and mixed 1,2/1,3-polyols which can be used for structural investigations of polyene macrolides and related compounds

Chirality published new progress about Alditols Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 617-55-0 belongs to class esters-buliding-blocks, and the molecular formula is C6H10O5, Category: esters-buliding-blocks.

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

Hamada, Taiji; Akahane, Toshiaki; Yokoyama, Seiya; Higa, Nayuta; Kirishima, Mari; Matsuo, Kei; Shimokawa, Michiko; Yoshimoto, Koji; Tanimoto, Akihide published the artcile< Oncogenic splice variant of PDGFRalpha in adult glioblastoma as therapeutic target for selective CDK4/6 inhibitors>, HPLC of Formula: 112-63-0, the main research area is CDK4 CDK6 inhibitor PDGFRalpha therapeutic target glioblastoma.

Understanding human genome alterations is necessary to optimize genome-based cancer therapeutics. However, some newly discovered mutations remain as variants of unknown significance (VUS). Here, the mutation c.1403A > G in exon 10 of the platelet-derived growth factor receptor-alpha (PDGFRA) gene, a VUS found in adult glioblastoma multiforme (GBM), was introduced in human embryonal kidney 293 T (HEK293T) cells using genome editing to investigate its potential oncogenic functions. Genome editing was performed using CRISPR/Cas9; the proliferation, drug sensitivity, and carcinogenic potential of genome-edited cells were investigated. We also investigated the mechanism underlying the observed phenotypes. Three GBM patients carrying the c.1403A > G mutation were studied to validate the in vitro results. The c.1403A > G mutation led to a splice variant (p.K455_N468delinsN) because of the generation of a 3′-acceptor splice site in exon 10. PDGFRA-mutated HEK293T cells exhibited a higher proliferative activity via PDGFRα and the cyclin-dependent kinase (CDK)4/CDK6-cyclin D1 signaling pathway in a ligand-independent manner. They showed higher sensitivity to multi-kinase, receptor tyrosine kinase, and CDK4/CDK6 inhibitors. Of the three GBM patients studied, two harbored the p.K455_N468delinsN splice variant. The splicing mutation c.1403A > G in PDGFRA is oncogenic in nature. Kinase inhibitors targeting PDGFRα and CDK4/CDK6 signaling should be evaluated for treating GBM patients harboring this mutation.

Scientific Reports published new progress about Cell morphology. 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

Han, Lei; Gan, LinLing; Hu, Xiangnan; Li, Wei; Zhu, Dali; Zheng, Jiecheng; Wu, Yue; Yu, Yu; Gan, Zongjie published the artcile< Cu(OAc)2 Mediated mild synthesis of 2-aminobenzimidazoles and 2-aminobenzoxazoles>, HPLC of Formula: 19241-24-8, the main research area is aminobenzimidazole preparation; phenylenediamine isothiocyanate desulfurization copper acetate desulfurization agent; aminobenzoxazole preparation; aminophenol isothiocyanate desulfurization copper acetate desulfurization agent.

An efficient and facile synthesis for 2-aminobenzimidazoles I [R1 = H, 6-Me, 6-OMe, etc.; R2 = C6H5, 2-MeC6H4, 2-ClC6H4, etc.] and 2-aminobenzoxazoles II [R1 = H, Me, Cl; R2 = C6H5, 4-ClC6H4] was reported. Thioureas prepared from the reaction of o-phenylenediamines or 2-aminophenols and isothiocyanate derivatives, underwent desulfurization reaction smoothly under mild conditions in the presence of Cu(OAc)2 and afforded a variety of N-heterocyclic compounds in moderate to good yields.

Synthetic Communications published new progress about Aromatic amines Role: RCT (Reactant), RACT (Reactant or Reagent). 19241-24-8 belongs to class esters-buliding-blocks, and the molecular formula is C11H13NS, HPLC of Formula: 19241-24-8.

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

Prathap, K. Jagadeesh; Himaja, M.; Mali, Sunil V. published the artcile< 5-Amino-1-(5-chloropyridin-2-yl)-1H-pyrazole-4-carboxylamino acids as potent insecticidal agents>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is chlorohydrazinopyridine cyclocondensation ethoxymethylene cyanoacetate; pyridyl aminopyrazole acid preparation coupling amino acid ester; amino chloropyridinyl pyrazole carboxylamino acid preparation insecticidal antibacterial activity.

A new series of 5-amino-1-(5-chloropyridin-2-yl)-1H-pyrazole-4-carboxy amino acid derivatives were synthesized by using benzotriazol-1-yloxytris(dimethylamino) phosphonium hexafluorophosphate (BOP) as coupling reagent. The key intermediate 5-amino-1-(5-chloropyridin-2-yl)-1H-pyrazole-4-carboxylic acid was synthesized by condensation of 5-chloro-2-hydrazinopyridine with Et (ethoxymethylene)cyanoacetate followed by basic hydrolysis. The structures of the newly synthesized compounds were confirmed by IR, 1H NMR and Mass spectral anal. and were evaluated for their antimicrobial and insecticidal activities. Some of the synthesized compounds showed potent insecticidal activity and moderate antibacterial activity with respect to the standard drug.

Indian Journal of Heterocyclic Chemistry published new progress about Amino acid esters 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, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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