Month: October 2022

Adam, Waldemar; Fell, Rainer T.; Hoch, Ute; Saha-Moeller, Chantu R.; Schreier, Peter published the artcile< Kinetic resolution of chiral α-hydroperoxy esters by horseradish peroxidase-catalyzed enantioselective reduction to α-hydroxy esters>, COA of Formula: C5H10O3, the main research area is kinetic resolution chiral hydroperoxy ester; horseradish peroxidase catalyzed enantioselective reduction; hydroxy ester.

The kinetic resolution of the Me α-hydroperoxy esters 4 has been investigated by horseradish peroxidase (HRP)-catalyzed reduction to the corresponding optically active α-hydroxy esters 5 in the presence of guaiacol. The method allows for the first time the preparation of enantiomerically pure (ee > 97%) Me (R)-2-hydroperoxybutyrate (4a). The HRP enzyme is sensitive to the steric demand of the ester alkyl side chain, as manifested by Et (ee > 97%) and iso-Pr (ee 79%), while the tert-Bu derivative is not accepted by the enzyme (no reduction).

Tetrahedron: Asymmetry published new progress about Chiral recognition. 73349-07-2 belongs to class esters-buliding-blocks, and the molecular formula is C5H10O3, COA of Formula: C5H10O3.

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

Fidelibus, Pablo M.; Silbestri, Gustavo F.; Lockhart, Maria T.; Mandolesi, Sandra D.; Chopa, Alicia B.; Podesta, Julio C. published the artcile< Three-step synthesis of arylpolyboronic acids from phenols via organotin compounds>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is boronic acid arenediboronic benzenetriboronic preparation transmetalation stannane borane; stannylation borylation chlorophenol diphenol preparation arenediboronic acid; Suzuki coupling arenediboronic acid preparation substituted terphenyl.

Starting from phenols, arenediboronic and arenetriboronic acids were prepared in three-step procedure by transmetalation of the corresponding distannyl and tristannyl arenes by BH3/THF; Suzuki coupling of the prepared boronic acids gave polyarene compounds Reaction of chlorophenols or diphenols with di-Et chlorophosphate gave the corresponding mono- or bis-(diethoxyphosphoryl)-substituted arenes, which undergo stannylation by Me3SnNa in liquid ammonia under irradiation, affording arenedistannanes (Me3Sn)2X (5, X = 1,4-naphthalenediyl; 6, X = 2,7-naphthalenediyl; 7, X = 3,5-pyridinediyl, 8, X = 4,4′-isopropylidenebis[1,4-phenylene]) in 65-90% yield. Reaction of 5-8 with BH3/THF afforded the diboronic acids, [(HO)2B]2X (12-15, same X) in around 80% yield. In order to confirm their structure, some of the diboronic acids were converted into the corresponding pinacol esters. The results obtained in a study on the synthesis of various terphenyls through double and triple Suzuki couplings catalyzed by palladium acetate between the obtained arylpolyboronic acids and various aryl halides are also reported. These reactions proceeded with an average 65% yield, also enabling to confirm the structures of some of the diboronic acids. The structure of the new compounds was determined by 1H, 13C and 119Sn NMR spectroscopy, mass spectrometry and IR spectroscopy.

Applied Organometallic Chemistry published new progress about Aryl halides Role: RCT (Reactant), RACT (Reactant or Reagent). 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

Wang, Yu; Tang, Kongshuang; Liu, Zhaohong; Ning, Yongquan published the artcile< Disulfonation of terminal alkynes for 1,2-bisulfonylethenes>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is terminal alkyne sodium sulfinate disulfonation; disulfonylethene preparation.

A highly efficient and operationally simple method for the synthesis of 1,2-disulfonylethenes involved a hypervalent iodine(III) reagent promoted disulfonation of terminal alkynes was developed. This protocol provided a facile and practical pathway to selectively access (E)-1,2-disulfonylethenes that featured a good functional group compatibility, easily available starting materials, excellent stereoselectivity, and good yields.

Chemical Communications (Cambridge, United Kingdom) published new progress about Alkynes, α- Role: RCT (Reactant), RACT (Reactant or Reagent). 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

Young, Steven D. published the artcile< Facile conversion of Hantzsch type 4-aryl-2,6-dimethyl-1,4-dihydropyridine-3,5-carboxylates into 4-aryl-2-methyl-5-oxo-1,4,5,7-tetrahydrofuro[3,4-b]pyridine-3-carboxylates>, Recommanded Product: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is furopyridinecarboxylate aryl hydro; bromination methylhydropyridinecarboxylate; pyridofuranone aryl; cyclization bromomethylhydropyridinecarboxylate.

Bromination of dihydropyridines I (R = Ph, o-tolyl, 3,4-methylenedioxyphenyl, m-F3CC6H4, C6F5, m-BrC6H4, o-anisyl, o-O2NC6H4; R1 = Me) with pyridinium bromide perbromide gave unstable I (R1 = CH2Br), which, treated with pyridine, cyclized to give 24-63% II.

Synthesis published new progress about Cyclization. 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

Yamazaki, Takayuki; Aoki, Satoko; Ohta, Keisuke; Hyuma, Shinji; Sakaguchi, Kengo; Sugawara, Fumio published the artcile< Synthesis of an immunosuppressant SQAG9 and determination of the binding peptide by T7 phage display>, HPLC of Formula: 112-63-0, the main research area is immunosuppressive sulfoquinovosylacylglycerol preparation; Drosophila melanogaster binding peptide immunosuppressive sulfoquinovosylacylglycerol; immunosuppressant SQAG9 preparation peptide binding.

SQAG9, a new class of immunosuppressive sulfoquinovosylacylglycerol, and its biotinylated derivatives have been synthesized. A T7 Phage library, composed of random cDNA fragments from Drosophila melanogaster, displayed a possible binding peptide of 14 amino acids. The immobilized synthetic peptide on a sensor chip showed a dissociation constant of KD=1.5×10-6 against SQAG9 in a surface plasmon resonance experiment

Bioorganic & Medicinal Chemistry Letters published new progress about Coliphage T7. 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

Hewitt, Patrick; Shultz, David A. published the artcile< In Search of Stable, High-Spin Polymers>, Synthetic Route of 112-63-0, the main research area is polythiophene spin polymer.

Oligomers of poly(thiophene) and poly(ortho-phenyleneethynylene) having pendant S = 1/2 semiquinone radicals (as complexes of cobalt(III)) have been prepared and characterized by ESR (EPR) spectroscopy and magnetic measurements (superconducting quantum interferences device = SQUID magnetometry). Our results show that exchange coupling of semiquinone groups along a polythiophene backbone is greater than the corresponding coupling along a poly(ortho-phenyleneethynylene) backbone.

Applied Magnetic Resonance published new progress about Polyacetylenes Role: PRP (Properties), 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.

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

Melo, Josue Alves; Silva, Larissa Alves de Aquino; Santos, Jandyson Machado; Wisniewski, Alberto Jr published the artcile< Advanced characterization of oxidized derivatives in alternative fatty esters mixture for biodiesel purposes>, Formula: C19H34O2, the main research area is fatty ester mixture oxidized derivative biodiesel thermogravimetric analysis.

Biofuels from unconventional sources contribute to the reduction of environmental impacts without competing with the food market. Samples of fatty esters mixture (FEM) for biodiesel purposes were produced from conventional and alternatives feedstocks sources of triacylglycerols (TAG). In this work, we evaluated the oxidative stability through a complex and advanced characterization at the mol. level of the chem. changes that occurred in these samples for a storage period of 2.5 years. Esters contents were determined by both TG and GC-FID analyses, and values with relative errors from 0.36 to 23.28% were obtained. Low mol. mass compounds derived from the oxidative processes and free fatty acids (FFA) contribute to these differences. TG curves also showed the presence of contaminants with high thermal stability, which were characterized by EASI(+)-MS. TAG and diacylglycerol (DAG) were identified, however, dimers and theirs derived from hydroperoxide degradation were detected as major contaminants, confirmed by the presence of biomarkers ions characteristics of dimers. Our work mapping and presenting the chem. profile of oxidative products of FEM, and in addition, we propose the correlation of relative abundance of ion m/z 349 corresponding to the hydroperoxide [C18:2 + 2O + Na]+ with the peroxide index values.

Fuel published new progress about Acidity. 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

Singh, Ravi P.; Aziz, Marian N.; Gout, Delphine; Fayad, Walid; El-Manawaty, May A.; Lovely, Carl J. published the artcile< Novel thiazolidines: Synthesis, antiproliferative properties and 2D-QSAR studies>, Name: 4-tert-Butylphenylisothiocyanate, the main research area is imino methoxybenzylidene thiazolidine thiazolidinone preparation antiproliferative human QSAR; 2D-QSAR; HCT-116; One-pot; Tandem reaction.

A series of N-substituted (Z)-2-imino-(5Z)-ylidene thiazolidines and (Z)-2-imino-(5Z)-ylidene thiazolidin-4-ones were synthesized and their antiproliferative activities against colon (HCT-116) and breast (MCF7) cancer cell lines were evaluated utilizing an MTT growth assay. A 2D-QSAR investigation was conducted to probe and validate the obtained antiproliferative properties for the thiazolidine derivatives The majority of the thiazolidines exhibit higher potency against a colon cancer cell line relative to the standard reference The p-halophenylimino p-anisylidene derivatives exhibited the highest anti-proliferative activity against HCT116 relative to control (IC50 = 8.9-10.0μM compared to 20.4μM observed for 5-fluorouracil as pos. control). An X-ray study confirmed the Z,Z’-configurations for two examples of the synthesized compounds

Bioorganic & Medicinal Chemistry published new progress about Amines, propargyl Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 19241-24-8 belongs to class esters-buliding-blocks, and the molecular formula is C11H13NS, Name: 4-tert-Butylphenylisothiocyanate.

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

Tararov, Vitali I.; Koenig, Gerd; Boerner, Armin published the artcile< Synthesis of statins. I. Synthesis and highly stereoselective hydrogenation of the statin precursor ethyl (5S)-5,6-isopropylidenedioxy-3-oxohexanoate>, Category: esters-buliding-blocks, the main research area is statin intermediate isopropylidenedioxyoxohexanoate preparation stereoselective hydrogenation.

A search for the large-scale preparation of (5S)-5,6-(isopropylidenedioxy)-3-oxohexanoate, a key intermediate in the synthesis of pharmacol. important statins, starting from (S)-malic acid is described. The synthesis of the required intermediate Me (3S)-3,4-(isopropylidenedioxy)butanoate (I) by Moriwake’s reduction of di-Me (S)-malate has been improved. Direct 2-C chain elongation of ester I using the lithium enolate of tert-Bu acetate has been shown to be successful at a 3- to 5-fold excess of the enolate. Unfortunately, the product, tert-Bu (5S)-5,6-(isopropylidenedioxy)-3-oxohexanoate is unstable during distillation Et (5S)-5,6-(isopropylidenedioxy)-3-oxohexanoate (II) was prepared alternatively on a multigram scale from (3S)-3,4-(isopropylidenedioxy)butanoic acid by activation with N,N’-carbonyldiimidazole and subsequent reaction with Mg(O2CCH2CO2Et)2. A convenient pathway for the in situ preparation of the latter is also described. II can be advantageously purified by distillation The stereochem. of the catalytic hydrogenation of II to Et (5S)-5,6-(isopropylidenedioxy)-3-hydrohyhexanoate (III) has been studied using a number of homogeneous achiral and chiral Rh(I) and Ru(II) complexes with phosphine ligands. A comparison of Rh(I) and Ru(II) catalysts with (S)- and (R)-BINAP as chiral ligands revealed opposite activity in dependence on the polarity of the solvent. No influence of the chiral backbone of substrate II on the enantioselectivity was noted. A ratio of syn/anti-III = 2.3 was observed with an achiral (Ph3P)3RuCl2 catalyst. Ru[(R)-Tol-BINAP]Cl2 neutralized with one equivalent of AcONa afforded the most efficient catalytic system for the production of optically pure syn-III at a preparative substrate/catalyst ratio of 1000:1.

Advanced Synthesis & Catalysis published new progress about Hydrogenation catalysts, stereoselective. 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

Sun, Rongli; Liu, Manman; Xu, Kai; Pu, Yunqiu; Huang, Jiawei; Liu, Jinyan; Zhang, Juan; Yin, Lihong; Pu, Yuepu published the artcile< Ferroptosis is involved in the benzene-induced hematotoxicity in mice via iron metabolism, oxidative stress and NRF2 signaling pathway>, Name: Ethyl 3-amino-4-(cyclohexylamino)benzoate, the main research area is oxidative stress iron metabolism benzene induced hematotoxicity ferroptosis; Benzene; Ferroptosis; Hematotoxicity; Iron overload; NRF2; Redox imbalance.

Benzene is a pollutant that widely exists in the environment and in occupational workplaces. Its exposure is closely associated with hematol. disorders and even leukemia, which poses a significant threat to public health. Thus, the underlying mechanisms should be explored. In the current study, it was investigated whether ferroptosis plays a role in benzene hematopoietic toxicity and related mechanisms. Mice were s.c. injected with benzene at 150 mg/kg b.w. to establish a hematotoxicity model. Four weeks later, the mice exposed to benzene exhibited a decrease in white blood cells, red blood cells, and Hb level, as well as reduction in frequency of hematopoietic stem and progenitor cells (HS/PCs) and the colony forming abilities of CFU-G, CFU-M, CFU-GM, and CFU-GEMM. Simultaneously, apart from ferroptosis features in the mitochondrial morphol., decreased ATP and mitochondrial membrane potential, alterations in biochem. indexes and gene expression were also observed, such as increased intracellular iron and lipid peroxidation, glutathione (GSH) depletion, and reduced glutathione peroxidase (GSH-Px) level, and upregulated PTGS2. Meanwhile, markedly altered expression of SLC7A11, GPX4, GCLC, NOX1, TFRC, FTH1, and FTL hinted that redox imbalance and dysfunction of iron uptake and storage are vital to induce ferroptosis. Addnl., decreased cytoplasmic NRF2 and increased nuclear NRF2 were also found, suggesting the activation of the NRF2 pathway. More importantly, inhibition of ferroptosis with ferrostatin-1 (Fer-1) or deferoxamine (DFO) partially relieved the hematopoietic injuries. Our findings imply that dysregulation in the system Xc-/GPX4 axis, iron metabolism, and activation of the NRF2 pathway play a crucial role in benzene-induced ferroptosis, and reveals that taking ferroptosis as a target may be a potential intervention strategy for benzene-induced hematotoxicity.

Chemico-Biological Interactions published new progress about Actins Role: BSU (Biological Study, Unclassified), BIOL (Biological Study). 347174-05-4 belongs to class esters-buliding-blocks, and the molecular formula is C15H22N2O2, Name: Ethyl 3-amino-4-(cyclohexylamino)benzoate.

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