Month: November 2022

Guberman, Monica; Pieber, Bartholomaeus; Seeberger, Peter H. published the artcile< Safe and Scalable Continuous Flow Azidophenylselenylation of Galactal to Prepare Galactosamine Building Blocks>, Recommanded Product: (2R,3R,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate, the main research area is azidophenyl selenylation galactal galactosamine glycoside preparation.

Differentially protected galactosamine building blocks are key components for the synthesis of human and bacterial oligosaccharides. The azidophenylselenylation of 3,4,6-tri-O-acetyl-D-galactal provides straightforward access to the corresponding 2-nitrogenated glycoside. Poor reproducibility and the use of azides that lead to the formation of potentially explosive and toxic species limit the scalability of this reaction and render it a bottleneck for carbohydrate synthesis. Here, we present a method for the safe, efficient, and reliable azidophenylselenylation of 3,4,6-tri-O-acetyl-D-galactal at room temperature, using continuous flow chem. Careful anal. of the transformation resulted in reaction conditions that produce minimal side products while the reaction time was reduced drastically when compared to batch reactions. The flow setup is readily scalable to process 5 mmol of galactal in 3 h, producing 1.2 mmol/h of product.

Organic Process Research & Development published new progress about Glycosides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 4098-06-0 belongs to class esters-buliding-blocks, and the molecular formula is C12H16O7, Recommanded Product: (2R,3R,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate.

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

Xie, Yangxi; Li, Fangyi; Zhao, Changgui; Wang, Jian published the artcile< N-heterocyclic carbene catalyzed and N-fluorobenzenesulfonimide mediated oxidative synthesis of perester and amide>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is heterocyclic carbene fluorobenzenesulfonimide tert butyl perester.

The first study of oxidative synthesis of simple tert-Bu peresters and amides enabled by N-heterocyclic carbene-catalysis using N-fluorobenzenesulfonimide (NFSI) as oxidant is described. The reaction proceeds with green, high yield, board substrate scope and room temperature

Youji Huaxue published new progress about Catalysis. 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

Shi, Jia; Dong, Xuchen; Han, Wei; Zhou, Peng; Liu, Liang; Wang, Haiyang; Jiang, Qianqian; Li, Haoran; Cheng, Shan; Li, Suwen; Yuan, Jiaqi; Qian, Zhiyuan; Dong, Jun published the artcile< Molecular characteristics of single patient-derived glioma stem-like cells from primary and recurrent glioblastoma>, Formula: C19H34O2, the main research area is human glioblastoma glioma stem like temozolomide.

Glioblastoma has high recurrence, while the sensitivity of recurrent glioblastoma to chemotherapy is lower than that of primary glioblastoma. Moreover, there is no standardized treatment for recurrent glioblastoma. Unfortunately, the biol. mechanism of recurrent glioblastoma is still unclear, and there are few related studies. We compared the phenotypes of clin. glioblastoma specimens, in-vitro cultured glioma stem-like cells (GSCs) and patient-derived xenograft tumor (PDX) models to explore the mol. genetic characteristics of primary and recurrent glioblastoma from the same patient. In vitro, SU5-2, GSCs derived from recurrent glioblastoma specimens, had stronger proliferative activity and self-renewal ability. Meanwhile, SU5-2 was more resistant to temozolomide and invasive than SU5-1, which derived from primary glioblastoma specimens. Further anal. of the expression of costimulatory mols. showed that the expression of B7-H1, B7-H2 and B7-H3 of SU5-2 were upregulated. In vivo, Kaplan-Meier survival curve anal. showed that the median survival of the recurrent PDX group was worse. The results of gene detection in vitro, PDX model and clin. samples were consistent. Our results showed that the GSCs based on glioblastoma specimens and the PDX models could replicate the main mol. genetic characteristics of original tumors, which provided a reliable exptl. platform for both tumor translation kinds of research and screening of mol. therapeutic targets.

Anti-Cancer Drugs published new progress about Cell invasion. 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

Ernst, Ludger published the artcile< Carbon-13 NMR spectroscopy of diethyl alkyl- and benzyl-phosphonates. A study of phosphorus-carbon spin-spin coupling constants over one to seven bonds>, Formula: C19H34O2, the main research area is phosphonate phosphorus carbon spin coupling; NMR phosphonate.

13C chem. shifts and 31P-13C coupling constants are reported for 10 alkyl-, 20 benzyl-, and 3 (naphthylmethyl)phosphonates. In saturated aliphatic chains 31P-13C couplings over >4 bonds could not be resolved whereas in benzyl type systems couplings over 7 bonds were observed Conformational and substituent effects on the coupling constants are discussed. NJ31P-19F (n = 4-6) are reported for the isomeric (fluorobenzyl)phosphonates and nJ31P-31P (n = 5-7) for the isomeric C6H4[CH2P(O)(OEt)2]2 (I) were obtained from 13C satellites. The relative signs of nJ31P-13C (n = 2-6) were obtained by comparison of the 13C absorptions of I (representing X of an ABX or AA’X system) with the spectra of MeC6H4CH2P(O)(OEt)2.

Organic Magnetic Resonance published new progress about NMR (nuclear magnetic resonance). 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

Yan, L.; Lin, S.; Liu, P. published the artcile< Carboxylic acid esters: synthesis from aldehydes, ketones, and derivatives (including enol ethers)>, Category: esters-buliding-blocks, the main research area is review carboxylic acid ester preparation organic synthesis; aldehyde reaction review; ketone reaction review.

A review of methods to prepare carboxylic acid esters from aldehydes, ketones, and derivatives including enol ethers.

Science of Synthesis published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent). 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

Ambur, Austin; Ambur, Lindsay; Khan, Leila; Nathoo, Rajiv published the artcile< Drug-induced hypersensitivity syndrome following temozolimide for glioblastoma multiforme and the role of desensitization therapy>, Product Details of C19H34O2, the main research area is glioblastoma multiforme drug hypersensitivity melanoma temozolomide prednisone desensitization therapy; Drug-induced hypersensitivity syndrome; drug reaction with eosinophilia and systemic symptoms; glioblastoma multiforme; melanoma; temozolomide.

Introduction: Temozolomide is an oral alkylating agent used as first line treatment of glioblastoma multiforme (GBM). It has also been used in the treatment of certain solid tumors such as metastatic melanoma. Commonly reported adverse effects include nausea and vomiting, constipation, headache, fatigue and myelosuppression. Cutaneous hypersensitivity reactions are rare and include an urticarial hypersensitivity reaction, alopecia, and Stevens-Johnson syndrome. To our knowledge, there are minimal reports of temozolomide-induced DRESS syndrome. Case Report: We present a 54-yr-old man with glioblastoma multiforme who presented with a fever, diarrhea and progressively worsening rash 6 wk after starting temozolomide. Management & Outcome: The patient was diagnosed recurrent DRESS syndrome and restarted on a gradual prednisone taper with resolution over the following weeks. Unfortunately, the patient was unable to be followed long-term due to relocation to a different state. Discussion: To our knowledge, there are minimal reports of temozolomide-induced DRESS syndrome. The diagnosis can be life-threatening, which makes management of patients with GBM and no alternative treatment option challenging. The use of de-sensitization therapy to temozolomide has been proposed for the management of severe adverse cutaneous reactions.

Journal of Oncology Pharmacy Practice published new progress about Allergy immunotherapy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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

Feng, Shao-Wei; Chang, Pei-Chi; Chen, Hsuan-Yu; Hueng, Dueng-Yuan; Li, Yao-Feng; Huang, Shih-Ming published the artcile< Exploring the Mechanism of Adjuvant Treatment of Glioblastoma Using Temozolomide and Metformin>, Electric Literature of 112-63-0, the main research area is O6-methylguanine-DNA methyltransferase; adjuvant treatment; glioblastoma; glioma; metformin; temozolomide.

Glioblastoma is the most frequent and lethal primary central nervous system tumor in adults, accounting for around 15% of intracranial neoplasms and 40-50% of all primary malignant brain tumors, with an annual incidence of 3-6 cases per 100,000 population. Despite maximum treatment, patients only have a median survival time of 15 mo. Metformin is a biguanide drug utilized as the first-line medication in treating type 2 diabetes. Recently, researchers have noticed that metformin can contribute to antineoplastic activity. The objective of this study is to investigate the mechanism of metformin as a potential adjuvant treatment drug in glioblastoma. Glioblastoma cell lines U87MG, LNZ308, and LN229 were treated with metformin, and several cellular functions and metabolic states were evaluated. First, the proliferation capability was investigated using the MTS assay and BrdU assay, while cell apoptosis was evaluated using the annexin V assay. Next, a wound-healing assay and mesenchymal biomarkers (N-cadherin, vimentin, and Twist) were used to detect the cell migration ability and epithelial-mesenchymal transition (EMT) status of tumor cells. Gene set enrichment anal. (GSEA) was applied to the transcriptome of the metformin-treated glioblastoma cell line. Then, DCFH-DA and MitoSOX Red dyes were used to quantify reactive oxygen species (ROS) in the cytosol and mitochondria. JC-1 dye and Western blotting anal. were used to evaluate mitochondrial membrane potential and biogenesis. In addition, the combinatory effect of temozolomide (TMZ) with metformin treatment was assessed by combination index anal. Metformin could decrease cell viability, proliferation, and migration, increase cell apoptosis, and disrupt EMT in all three glioblastoma cell lines. The GSEA study highlighted increased ROS and hypoxia in the metformin-treated glioblastoma cells. Metformin increased ROS production, impaired mitochondrial membrane potential, and reduced mitochondrial biogenesis. The combined treatment of metformin and TMZ had U87 as synergistic, LNZ308 as antagonistic, and LN229 as additive. Metformin alone or combined with TMZ could suppress mitochondrial transcription factor A, Twist, and O6-methylguanine-DNA methyltransferase (MGMT) proteins in TMZ-resistant LN229 cells. In conclusion, our study showed that metformin decreased metabolic activity, proliferation, migration, mitochondrial biogenesis, and mitochondrial membrane potential and increased apoptosis and ROS in some glioblastoma cells. The sensitivity of the TMZ-resistant glioblastoma cell line to metformin might be mediated via the suppression of mitochondrial biogenesis, EMT, and MGMT expression. Our work provides new insights into the choice of adjuvant agents in TMZ-resistant GBM therapy.

International Journal of Molecular Sciences published new progress about 112-63-0. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.

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

Hirasawa, Makoto; Saleh, Mohammed A. A.; de Lange, Elizabeth C. M. published the artcile< The Extension of the LeiCNS-PK3.0 Model in Combination with the ""Handshake"" Approach to Understand Brain Tumor Pathophysiology>, Name: (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is brain tumor pathophysiol LeiCNS pharmacokinetic model drug development BBB; blood-tumor barrier; brain tumors; physiologically based pharmacokinetic model; tumor pathophysiology.

Micrometastatic brain tumor cells, which cause recurrence of malignant brain tumors, are often protected by the intact blood-brain barrier (BBB). Therefore, it is essential to deliver effective drugs across not only the disrupted blood-tumor barrier (BTB) but also the intact BBB to effectively treat malignant brain tumors. Our aim is to predict pharmacokinetic (PK) profiles in brain tumor regions with the disrupted BTB and the intact BBB to support the successful drug development for malignant brain tumors. LeiCNS-PK3.0, a comprehensive central nervous system (CNS) physiol. based pharmacokinetic (PBPK) model, was extended to incorporate brain tumor compartments. Most pathophysiol. parameters of brain tumors were obtained from literature and two missing parameters of the BTB, paracellular pore size and expression level of active transporters, were estimated by fitting existing data, like a “”handshake””. Simultaneous predictions were made for PK profiles in extracellular fluids (ECF) of brain tumors and normal-appearing brain and validated on existing data for six small mol. anticancer drugs. The LeiCNS-tumor model predicted ECF PK profiles in brain tumor as well as normal-appearing brain in rat brain tumor models and high-grade glioma patients within twofold error for most data points, in combination with estimated paracellular pore size of the BTB and active efflux clearance at the BTB. Our model demonstrated a potential to predict PK profiles of small mol. drugs in brain tumors, for which quant. information on pathophysiol. alterations is available, and contribute to the efficient and successful drug development for malignant brain tumors.

Pharmaceutical Research published new progress about Blood microvessel. 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

Wang, Lucia; Lin, Shengjia; Santos, Emmanuel; Pralat, Jenna; Spotton, Kaylyn; Sharma, Abhishek published the artcile< Boron-Promoted Deprotonative Conjugate Addition: Geminal Diborons as Soft Pronucleophiles and Acyl Anion Equivalents>, Application In Synthesis of 94-02-0, the main research area is diboryl ketone preparation; geminal diboron alkene deprotonative conjugate addition.

The 1,4-addition of α,α-diboryl carbanions generated via deprotonation of the corresponding geminal diborons R1CH(Bpin)2 (R1 = prop-2-en-1-yl, thiophen-3-ylmethyl, cyclopropylmethyl, etc.) has been reported. The methodol. provided a general route to highly substituted and synthetically useful γ,γ-diboryl ketones R1C(Bpin)2CH(R3)C(O)R2 (R2 = C6H5, 4-ClC6H4, cyclohexyl, etc.; R3 = Me, Ph, Et, etc.). The development of geminal diborons as soft pronucleophiles also enabled their use as acyl anion equivalent via a one-pot tandem conjugate addition-oxidation sequence.

Journal of Organic Chemistry published new progress about Alkanes Role: RCT (Reactant), RACT (Reactant or Reagent) (diboryl). 94-02-0 belongs to class esters-buliding-blocks, and the molecular formula is C11H12O3, Application In Synthesis of 94-02-0.

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

Wu, Mengfan; Lin, Ruimei; Yin, Jiaxin; Ding, Hui; Han, Lifeng; Yang, Wenzhi; Bie, Songtao; Wang, Chunhua; Zheng, Wei; Song, Xinbo; Ma, Baiping; Yu, Heshui; Li, Zheng published the artcile< The multicomponent characterization of Shuanghe decoction by dimension-enhanced data-independent HDMSE: Focusing on the performance comparison between MSE and HDMSE>, Product Details of C19H34O2, the main research area is Shuanghe decoction chinese medicine ion mobility quadrupole mass spectrometry.

The co-elution, pervasive isomers, and frequently occurring in-source fragmentation definitely hinder the comprehensive characterization of the multiple components from traditional Chinese medicine (TCM) by liquid chromatog./mass spectrometry. Herein, a dimension-enhanced strategy, by utilizing an ion mobility quadrupole time-of-flight mass spectrometer coupled to ultra-high performance liquid chromatog. (UHPLC/IM-QTOF-MS) with the ability of offering four-dimensional information (retention time, Rt; drift time or collision cross section, CCS; accurate mass of precursors; and accurate MS2 product ions), is presented. Shuanghe Decoction (SHD) is a classic tonifying formula composed of nine herbs, however, little is known to its chem. complexity, hitherto. Good chromatog. separation was achieved on an HSS T3 column, and by the Vion IMS-QTOF high-resolution mass spectrometer, data-independent MSE and High-Definition MSE (HDMSE) in both the neg. and pos. electrospray ionization modes were employed for acquiring the collision-induced dissociation-MS2 data. A self-built database, including 642 known compounds, was established, which assisted to perform the automated peak annotation by UNIFI. By reference to 55 compounds, totally 236 components were identified or tentatively characterized from SHD with 4D data recorded. The combination of neg. and pos. modes could yield more information complementary to structural elucidation. Compared with the conventional MSE, HDMSE exhibit of merits in the provision of CCS, better separation and detection those easily co-eluting components, and reduction of the false positives in the identification results. Conclusively, the combination of HDMSE acquisition, inhouse library, and UNIFI-facilitated automated peak annotation, renders a potent approach dedicated to deconvoluting the chem. composition of complex systems like TCM formulas.

Arabian Journal of Chemistry published new progress about Angelica sinensis. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Product Details of C19H34O2.

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