Category: esters-buliding-blocks

Palinko, Istvan;Szabo, Pal Tamas;Torok, Bela;Kele, Zoltan;Kapocsi, Iren published 《Fragmentation of cyclobutane derivatives upon electron impact: transformation pathways elucidated by mass spectrometric methods and semiempirical quantum chemical calculations》 in 1998. The article was appeared in 《Rapid Communications in Mass Spectrometry》. They have made some progress in their research.Related Products of 3779-29-1 The article mentions the following:

The fragmentation behavior of cyclobutane derivatives (carboxylic acids, esters, cyclobutanediols, silyl ethers of the hydroxy compounds) was first studied by the GC/MS method under electron-impact (EI) ionization. Then, in order to establish the sequence of transformations, MS/MS, and in situ deuteration as well as accurate mass measurements, were performed. Anal. of these measurements revealed characteristic transformation pathways: (1) the substituents were easily cleaved; (2) in most cases the cyclobutane ring was opened with the rupture of C-C bonds opposite to each other; (3) upon ring opening, the most substituted ring C-C bond was cleaved 1st and preferentially; and (4) primary fragmentation was followed by secondary reactions including further cleavage of the ions as well as rearrangements. Sym. ring scission was observed for cyclobutanediols and their silyl ethers, providing only 1 primary fragment with m/z half that of the mol. weight This type of fragmentation was consistent with semiempirical AM1 calculations And Diethyl cyclobutane-1,1-dicarboxylate (cas: 3779-29-1) was used in the research process.

Diethyl cyclobutane-1,1-dicarboxylate (cas:3779-29-1
) is a solid catalyst that can be used in the synthesis of alkylating agents. It is used in the manufacture of cyclopropyl ketones and has been shown to exhibit anticancer properties.

Reference:
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Narobe, Rok;Murugesan, Kathiravan;Haag, Christoph;Schirmer, Tobias Emanuel;Koenig, Burkhard published 《C(sp³)-H Ritter amination by excitation of in-situ generated iodine(III)-BF₃ complexes》. The research results were published in《Chemical Communications (Cambridge, United Kingdom)》 in 2022.Safety of Methyl 3-methylbenzoate The article conveys some information:

Visible light excitation of iodine(III)-BF₃ complex enables the formation of carbocations from C(sp³)-H bonds. The complexes were generated catalytically from iodoarene, carboxylate ligand, the oxidizing agent Selectfluor and the Lewis acid BF₃. This modular catalytic system allowed the formation of synthetically valuable amine derivatives without a metal- or photocatalyst.Methyl 3-methylbenzoate (cas: 99-36-5) were involved in the experimental procedure.

Methyl 3-methylbenzoate (cas: 99-36-5) is a common ester. Esters are widespread in nature and are widely used in industry. Several billion kilograms of polyesters are produced industrially annually, important products being polyethylene terephthalate, acrylate esters, and cellulose acetate.Safety of Methyl 3-methylbenzoate

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Wu, Luyi;Gu, Muen;Zhu, Yi;Liu, Huirong;Qin, Wenzheng;Huang, Yan;Dou, Chuanzi;Yuan, Lingsong;Lu, Ying;Zhou, Cili;Li, Jing published 《Urine metabonomic research of herbs-partition moxibustion with matching mu points in UC rats based on UPLC-Q/TOF MS》. The research results were published in《Shijie Zhongyiyao》 in 2016.Category: esters-buliding-blocks The article conveys some information:

To explore the mechanism of herbs-partition moxibustion with the matching mu points in treating UC rats based on metabonomic with UPLC-Q/TOF MS. Methods: Sprague-Dawley rats of 27 cases were randomly divided into normal group, model group, herbs-partition moxibustion with the matching mu points group. The UC rat model was established by drinking DSS aqueous solution In herbs-partition moxibustion with the matching mu points group, each point moxibustion with 2 moxa cones, once per day, and lasting for 14 days. After moxibustion treatment, all groups urine was analyzed with UPLC-Q/TOF MS. The acquired data were analyzed using principal component anal. (PCA) and partial least squares discriminant anal. (PLS-DA). The potential biomarkers and metabolic pathways were analyzed by Metlin (http://metlin.scripps. edu/), KEGG (http: //www.kegg.jp), HMDB (http: //www.hmdb.ca), MetaboAnalyst 3.0 (http: //www.metaboanalyst.ca). Results: Under both pos. ion model and neg. ion model, the separation trends of 3 groups urine were good. Herbs-partition moxibustion with the matching mu points effectively reduced in 6 different metabolites expression, such as L-cysteine, atraric acid, tocopheronic acid, di-Bu malate, L-tyrosine, L-pipecolic acid, which increased in model group. All 6 different metabolites above were mainly related to amino acid metabolic pathways, such as phenylalanine, tyrosine and tryptophan biosynthesis, cysteine and methionine metabolism, tyrosine metabolism, and so on. Conclusion: The mechanism of herbs-partition moxibustion with the matching mu points in treating UC may mainly relate to amino acid metabolism To complete the study, the researchers used Methyl 2,4-dihydroxy-3,6-dimethylbenzoate (cas: 4707-47-5) .

Methyl 2,4-dihydroxy-3,6-dimethylbenzoate(4707-47-5) is used in biological study as role of androgens in inducing distinct response of epithelial-mesenchymal transition factors in human prostate cancer cells.Category: esters-buliding-blocks

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Boehm, Philip;Roediger, Sven;Bismuto, Alessandro;Morandi, Bill published 《Palladium-Catalyzed Chlorocarbonylation of Aryl (Pseudo)Halides Through In Situ Generation of Carbon Monoxide》 in 2020. The article was appeared in 《Angewandte Chemie, International Edition》. They have made some progress in their research.Category: esters-buliding-blocks The article mentions the following:

An efficient palladium-catalyzed chlorocarbonylation of aryl (pseudo)halides that gives access to a wide range of carboxylic acid derivatives has been developed. The use of butyryl chloride as a combined CO and Cl source eludes the need for toxic, gaseous carbon monoxide, thus facilitating the synthesis of high-value products from readily available aryl (pseudo)halides. The combination of palladium(0), Xantphos, and an amine base is essential to promote this broadly applicable catalytic reaction. Overall, this reaction provides access to a great variety of carbonyl-containing products through in situ transformation of the generated aroyl chloride. Combined exptl. and computational studies support a reaction mechanism involving in situ generation of CO. And Methyl 3-methylbenzoate (cas: 99-36-5) was used in the research process.

Methyl 3-methylbenzoate (cas: 99-36-5) is a common ester. Esters are widespread in nature and are widely used in industry. Several billion kilograms of polyesters are produced industrially annually, important products being polyethylene terephthalate, acrylate esters, and cellulose acetate.Category: esters-buliding-blocks

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

Weeks, John;Li, Albert P.;Doshi, Utkarsh;Johanning, Karla;Guiney, Patrick D. published 《In vitro evaluation of the metabolic stability of nine fragrance chemicals in trout and human hepatocytes》. The research results were published in《Journal of Applied Toxicology》 in 2020.Formula: C15H28O2 The article conveys some information:

In vitro metabolic stability of nine fragrance chems.: p-tolyl acetate, cashmeran, ethylene brassylate, celestolide, galaxolide, traseolide, ambretone, tonalide and pentadecanolide, was evaluated in trout and human hepatocytes. The compounds were incubated with trout hepatocytes at 12°C and human hepatocytes at 37°C. Quantification of compound disappearance with time was performed using gas chromatog./mass spectrometry. in vivo hepatic intrinsic clearance values were calculated from the in vitro data. Significant metabolism was observed with trout hepatocytes for five of the nine fragrance chems., while all nine were metabolized significantly with human hepatocytes. Previously published models were used to examine expected bioaccumulation and persistence in whole organisms. Calculated half-lives due to metabolism of the nine chems. are significantly shorter for humans than trout: <1 h and <1 day, resp. For all chems. with demonstrated hepatic metabolism, the models indicate a lack of accumulation. For those where metabolism was demonstrated in trout, calculated bioconcentration factors would not be classified as bioaccumulative under prevailing regulatory systems.Oxacyclohexadecan-2-one (cas: 106-02-5) were involved in the experimental procedure.

Oxacyclohexadecan-2-one(cas:106-02-5) is a natural product found in Lonicera japonica and Angelica archangelica.Formula: C15H28O2 It is a macrocyclic lactone that can be used as a flavoring agent and fragrance ingredient due to its musk flavor/odor.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Pham, Ly L.;Truong, Lisa;Ouedraogo, Gladys;Loisel-Joubert, Sophie;Martin, Matthew T.;Paul Friedman, Katie published 《Profiling 58 compounds including cosmetic-relevant chemicals using ToxRefDB and ToxCast》. The research results were published in《Food and Chemical Toxicology》 in 2019.Name: 1-Phenylethyl acetate The article conveys some information:

This work suggests that NAMs for bioactivity may inform a conservative point-of-departure estimate for diverse CRCs. For 17 of the 58 CRCs, high-throughput toxicokinetic data were used to calculate administered equivalent doses (AEDs) in mg/kg/day units for the in vitro bioactivity observed, and these AEDs served as conservative estimators of the systemic LELs observed in vivo. In terms of both target organ effects and study type, the median of the lowest effect level (LEL) doses in ToxRefDB for CRCs tended to be slightly higher than the median for the remaining 928 chems. with study data in ToxRefDB, though the ranges of LELs were similar. CRCs were diverse in use types as suggested by broad chem. use categories. To demonstrate NAMs for safety assessment, we surveyed in vitro bioactivity and in vivo systemic toxicity data in the US Environmental Protection Agency’s (EPA’s) Toxicity Forecaster (ToxCast) and Toxicity Reference databases (ToxRefDB), resp., for 58 chems. identified as CRCs, including cosmetic ingredients as well as trace contaminants. Safety assessment for cosmetic-relevant chems. (CRCs) in the European Union has been reshaped by restrictions on animal testing, and new approach methodologies (NAMs) for predicting toxicity are critical to ensure new cosmetic product safety. The experimental procedure involved many compounds, such as 1-Phenylethyl acetate (cas: 93-92-5) .

1-Phenylethyl acetate(cas:93-92-5) is a carboxylic ester. Name: 1-Phenylethyl acetate It may be prepared by acetylation of methyl phenyl carbinol; from benzaldehyde by reacting with magnesium methyl bromide and subsequent acetylation; from 1-bromoethylbenzene and silver acetate in acetic acid.

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Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Taritla, Sidhartha;Kumari, Madhuree;Kamat, Siya;Bhat, Sarita G.;Jayabaskaran, C. published 《Optimization of physicochemical parameters for production of cytotoxic secondary metabolites and apoptosis induction activities in the culture extract of a marine algal-derived endophytic fungus Aspergillus sp.》. The research results were published in《Frontiers in Pharmacology》 in 2021.Reference of 1-Phenylethyl acetate The article conveys some information:

The endophytic fungal community in the marine ecosystem has been demonstrated to be relevant source of novel and pharmacol. active secondary metabolites. The current study focused on the evaluation of cytotoxic and apoptosis induction potential in the culture extracts of endophytic fungi associated with Sargassum muticum, a marine brown alga. The cytotoxicity of the four marine endophytes, Aspergillus sp., Nigrospora sphaerica, Talaromyces purpureogenus, and Talaromyces stipitatus, was evaluated by the MTT assay on HeLa cells. Further, several physicochem. parameters, including growth curve, culture media, and organic solvents, were optimized for enhanced cytotoxic activity of the selected extract The Aspergillus sp. Et acetate extract (ASE) showed maximum cytotoxicity on multiple cancer cell lines. Chem. investigation of the metabolites by gas chromatog.-mass spectroscopy (GC-MS) showed the presence of several compounds, including quinoline, indole, 2,4-bis(1,1-dimethylethyl) phenol, and hexadecenoic acid, known to be cytotoxic in ASE. The ASE was then tested for cytotoxicity in vitro on a panel of six human cancer cell lines, namely, HeLa (cervical adenocarcinoma), MCF-7 (breast adenocarcinoma), Hep G2 (hepatocellular carcinoma), A-549 (lung carcinoma), A-431 (skin/epidermis carcinoma), and LN-229 (glioblastoma). HeLa cells were most vulnerable to ASE treatment with an IC₅₀ value of 24 ± 2 μg/mL. The mechanism of cytotoxicity exhibited by the ASE was further investigated on Hela cells. The results showed that the ASE was capable of inducing apoptosis in HeLa cells through production of reactive oxygen species, depolarization of mitochondrial membrane, and activation of the caspase-3 pathway, which shows a possible activation of the intrinsic apoptosis pathway. It also arrested the HeLa cells at the G2/M phase of the cell cycle, eventually leading to apoptosis. Through this study, we add to the knowledge about the marine algae associated with fungal endophytes and report its potential for purifying specific compounds responsible for cytotoxicity. And 1-Phenylethyl acetate (cas: 93-92-5) was used in the research process.

1-Phenylethyl acetate(cas:93-92-5) is a carboxylic ester. Reference of 1-Phenylethyl acetate It may be prepared by acetylation of methyl phenyl carbinol; from benzaldehyde by reacting with magnesium methyl bromide and subsequent acetylation; from 1-bromoethylbenzene and silver acetate in acetic acid.

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

Pedragosa-Moreau, Sandrine;Le Flohic, Alexandre;Thienpondt, Vivien;Lefoulon, Francois;Petit, Anne-Marie;Rios-Lombardia, Nicolas;Moris, Francisco;Gonzalez-Sabin, Javier published 《Exploiting the Biocatalytic Toolbox for the Asymmetric Synthesis of the Heart-Rate Reducing Agent Ivabradine》. The research results were published in《Advanced Synthesis & Catalysis》 in 2017.Application In Synthesis of 1-Phenylethyl acetate The article conveys some information:

Several chemoenzymic routes have been evaluated for the production of the heart-rate reducing agent ivabradine. Lipases and ω-transaminases have been identified as useful biocatalysts for the preparation of key enantiopure precursors. The lipase-catalyzed kinetic resolution by alkoxycarbonylation of a racemic primary amine and subsequent chem. reduction of the resulting carbamate provided an N-methylated (S)-amine, one step away from ivabradine. Alternatively, the dynamic kinetic resolution by asym. bioamination of an aldehyde precursor enabled, in a four-step sequence, the preparative scale synthesis of enantiopure ivabradine in 50% overall yield.1-Phenylethyl acetate (cas: 93-92-5) were involved in the experimental procedure.

1-Phenylethyl acetate(cas:93-92-5) is a carboxylic ester. Application In Synthesis of 1-Phenylethyl acetate It may be prepared by acetylation of methyl phenyl carbinol; from 1-bromoethylbenzene and silver acetate in acetic acid; from benzaldehyde by reacting with magnesium methyl bromide and subsequent acetylation.

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

Mun, Seul-Ki;Kang, Kyung-Yun;Jang, Ho-Yeol;Hwang, Yun-Ho;Hong, Seong-Gyeol;Kim, Su-Jin;Cho, Hyun-Wook;Chang, Dong-Jo;Hur, Jae-Seoun;Yee, Sung-Tae published 《Atraric acid exhibits anti-inflammatory effect in lipopolysaccharide-stimulated RAW264.7 cells and mouse models》 in 2020. The article was appeared in 《International Journal of Molecular Sciences》. They have made some progress in their research.HPLC of Formula: 4707-47-5 The article mentions the following:

Lichens, composite organisms resulting from the symbiotic association between the fungi and algae, produce a variety of secondary metabolites that exhibit pharmacol. activities. This study aimed to investigate the anti-inflammatory activities of the secondary metabolite atraric acid produced by Heterodermia hypoleuca. The results confirmed that atraric acid could regulate induced pro-inflammatory cytokine, nitric oxide, prostaglandin E2, induced nitric oxide synthase and cyclooxygenase-2 enzyme expression in lipopolysaccharide (LPS)-stimulated RAW264.7 cells. Meanwhile, atraric acid downregulated the expression of phosphorylated IκB, extracellular signal-regulated kinases (ERK) and nuclear factor kappa B (NFκB) signaling pathway to exhibit anti-inflammatory effects in LPS-stimulated RAW264.7 cells. Based on these results, the anti-inflammatory effect of atraric acid during LPS-induced endotoxin shock in a mouse model was confirmed. In the atraric acid treated-group, cytokine production was decreased in the peritoneum and serum, and each organ damaged by LPS-stimulation was recovered. These results indicate that atraric acid has an anti-inflammatory effect, which may be the underlying mol. mechanism involved in the inactivation of the ERK/NFκB signaling pathway, demonstrating its potential therapeutic value for treating inflammatory diseases. The experimental procedure involved many compounds, such as Methyl 2,4-dihydroxy-3,6-dimethylbenzoate (cas: 4707-47-5) .

Methyl 2,4-dihydroxy-3,6-dimethylbenzoate(4707-47-5) is used in biological study as role of androgens in inducing distinct response of epithelial-mesenchymal transition factors in human prostate cancer cells.HPLC of Formula: 4707-47-5

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Ester – an overview | ScienceDirect Topics

Liu, Bing-Lei;Hu, Xin;He, Hua-Liang;Qiu, Lin;Li, You-Zhi;Ding, Wen-Bing published 《A new epicatechin glucopyranoside derivative from Styrax suberifolius》. The research results were published in《Natural Product Research》 in 2020.Category: esters-buliding-blocks The article conveys some information:

A new derivative of epicatechin glucopyranoside, (2R,3R)-3,7,4′-trihydroxy-5,3′-dimethoxyflavan 7-O-β-D-glucopyranoside (1), together with three mononuclear phenolic acid esters, Me orsellinate (2), Et orsellinate (3) and Me β-orcinolcarboxylate (4) were isolated from the bark of Styrax suberifolius. The structures of 1-4 were determined on the basis of extensive anal. of NMR and MS spectra combined with chem. hydrolysis. The antifungal activities of the isolated compounds against three plant pathogenic fungi, Alternaria solani, Fusarium oxysporum and Phomopsis cytospore were evaluated using radial growth inhibition assay. Compounds 2, 3 and 4 exerted selective inhibitory activities against the tested fungi. Among of them, Me β-orcinolcarboxylate (4) exhibited obvious inhibitory effect against P. cytospore, with an inhibition rate of 86.72% at 100μg/mL. To complete the study, the researchers used Methyl 2,4-dihydroxy-3,6-dimethylbenzoate (cas: 4707-47-5) .

Methyl 2,4-dihydroxy-3,6-dimethylbenzoate(4707-47-5) is used in biological study as role of androgens in inducing distinct response of epithelial-mesenchymal transition factors in human prostate cancer cells.Category: esters-buliding-blocks

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