Tag: 100-200

Yun, Jing; Cui, Chuanjian; Zhang, Shihua; Zhu, Jiaji; Peng, Chuanyi; Cai, Huimei; Yang, Xiaogen; Hou, Ruyan published their research in Food Chemistry in 2021. The article was titled 《Use of headspace GC/MS combined with chemometric analysis to identify the geographic origins of black tea》.SDS of cas: 119-36-8 The article contains the following contents:

Some black teas demand high market prices. Black tea samples (306) collected from 10 geog. origins, including China (Guxi, Likou, Jinzipai, Guichi, Dongzhi, Changning, Wuyishan, Shaowu), India (Darjeeling), and Sri Lanka (Kandy), were analyzed using headspace volatilization followed by GC/MS (HS-GC/MS). Forty-eight volatile compounds were identified. The aroma compounds were mainly identified as alcs., aldehydes, ketones, and esters. Anal. of either full-spectrum data or 22 tea compounds shared among the samples with k-Nearest Neighbor (k-NN) and Random Forest (RF) models discriminated all origins at 100% using KNN and 95% with RF using either data set. The discrimination rates using 2 key aroma compounds (linalool and geraniol) by k-NN were 100% for nine origins, with the rate for Guxi area at 89%, because 3 samples were classified to Jinzipai. The findings support the use of HS-GC/MS combined with chemometrics as a tool to identify the origin of black tea. The experimental process involved the reaction of Methyl Salicylate(cas: 119-36-8SDS of cas: 119-36-8)

Methyl Salicylate(cas: 119-36-8) has been used: as a component of clarifying solution for treating Mongolian gerbil cochlea intact for immunofluorescence analysis, as a plant elicitor to test its effect on reducing the whitefly population from tomato plants.SDS of cas: 119-36-8

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

《γ-Selective Vinylogous Aza-Morita-Baylis-Hillman Reaction with N-Carbamoylimines》 was written by Gondo, Naruhiro; Tanigaki, Yusuke; Ueda, Yoshihiro; Kawabata, Takeo. Category: esters-buliding-blocks And the article was included in Synlett in 2020. The article conveys some information:

Vinylogous aza-Morita-Baylis-Hillman (aza-MBH) reactions of 3-vinylcyclopentenone with N-Boc imines RCH=NC(O)OC(CH3)3 (R = Ph, pyridin-3-yl, 3-chlorophenyl, etc.) provide the corresponding γ-adducts RCH(NHC(O)OC(CH3)3)C(=CH2)R1 (R1 = 3-oxocyclopent-1-en-1-yl) in high regioselectivity (10 examples). While the corresponding reactions with N-Ts imines such as 4-methyl-N-(phenylmethylidene)benzene-1-sulfonamide give the α-adducts such as N-[(2-ethenyl-5-oxocyclopent-1-en-1-yl)(phenyl)methyl]-4-methylbenzene-1-sulfonamide and γ-adducts depending on the catalyst, those with N-Boc imines proceed in a γ-selective manner, irresp. of the promoter. The nature of the protecting groups on the nitrogen of aldimines is found to play a key role in the regiochem. course of vinylogous aza-MBH reactions. The results came from multiple reactions, including the reaction of tert-Butyl carbamate(cas: 4248-19-5Category: esters-buliding-blocks)

tert-Butyl carbamate(cas: 4248-19-5) belongs to anime. The methylamines occur in small amounts in some plants. Many polyfunctional amines (i.e., those having other functional groups in the molecule) occur as alkaloids in plants—for example, mescaline, 2-(3,4,5-trimethoxyphenyl)ethylamine; the cyclic amines nicotine, atropine, morphine, and cocaine; and the quaternary salt choline, N-(2-hydroxyethyl)trimethylammonium chloride, which is present in nerve synapses and in plant and animal cells.Category: esters-buliding-blocks

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

《Formation of trisubstituted buta-1,3-dienes and α,β-unsaturated ketones via the reaction of functionalized vinyl phosphates and vinyl phosphordiamidates with organometallic reagents》 was published in RSC Advances in 2020. These research results belong to Oeser, Petr; Koudelka, Jakub; Dvorakova, Hana; Tobrman, Tomas. Computed Properties of C7H12O3 The article mentions the following:

The reactions of vinyl phosphates and vinyl phosphordiamidates containing an ester functional group with organometallic reagents were studied. The functionalized vinyl phosphates were smoothly converted into tri- and tetrasubstituted buta-1,3-dienes via the reaction with aryllithium reagents were found. Moreover, the vinyl phosphordiamidates were converted into α,β-unsaturated ketones using Grignard reagents. Based on the performed experiments, a reaction mechanism, which was confirmed by means of the isolation of key intermediates were presented. In the experiment, the researchers used Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3Computed Properties of C7H12O3)

Ethyl 2-methyl-3-oxobutanoate(cas: 609-14-3) belongs to ketone compounds. Ketones are highly reactive, although less so than aldehydes, to which they are closely related. Much of their chemical activity results from the nature of the carbonyl group. Ketones readily undergo a wide variety of chemical reactions.Computed Properties of C7H12O3

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

《Identification and analysis of key genes involved in methyl salicylate biosynthesis in different birch species》 was published in PLoS One in 2020. These research results belong to Singewar, Kiran; Moschner, Christian R.; Hartung, Eberhard; Fladung, Matthias. Name: Methyl Salicylate The article mentions the following:

In this study, we performed a comprehensive bioinformatics anal. of two candidate genes mediating MeSA biosynthesis, SALICYLIC ACID METHYLTRANSFERASE (SAMT) and SALICYLIC ACID-BINDING PROTEIN 2 (SABP2), of high (B. lenta, B. alleghaniensis, B. medwediewii, and B. grossa) and low (B. pendula, B. utilis, B. alnoides, and B. nana) MeSA-producing birch species. Phylogenetic analyses of SAMT and SABP2 genes and homologous genes from other plant species confirmed their evolutionary relationships. Multiple sequence alignments of the amino acid revealed the occurrence of important residues for substrate specificity in SAMT and SABP2. The anal. of cis elements in different birches indicated a functional multiplicity of SAMT and SABP2 and provided insights into the regulation of both genes. We successfully developed six prominent single nucleotide substitution markers that were validated with 38 addnl. birch individuals to differentiate high and low MeSA-producing birch species. Relative tissue-specific expression anal. of SAMT in leaf and bark tissue of two high and two low MeSA-synthesizing birches revealed a high expression in the bark of both high MeSA-synthesizing birches. In contrast, SABP2 expression in tissues revealed indifferent levels of expression between species belonging to the two groups. The comparative expression and bioinformatics analyses provided vital information that could be used to apply plant genetic engineering technol. in the mass production of organic MeSA. In addition to this study using Methyl Salicylate, there are many other studies that have used Methyl Salicylate(cas: 119-36-8Name: Methyl Salicylate) was used in this study.

Methyl Salicylate(cas: 119-36-8) has been used: as a component of clarifying solution for treating Mongolian gerbil cochlea intact for immunofluorescence analysis, as a plant elicitor to test its effect on reducing the whitefly population from tomato plants.Name: Methyl Salicylate

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

The author of 《Rh(III)-catalyzed annulation of Boc-protected benzamides with diazo compounds: approach to isocoumarins》 were Dong, Guangyu; Li, Chunpu; Liu, Hong. And the article was published in Molecules in 2019. Safety of Ethyl 3-oxopentanoate The author mentioned the following in the article:

Isocoumarins I [R1 = H, 6-F, 7-Cl, etc.; R2 = Me, i-Pr, 4-MeOC6H4, etc.; R3 = Me, Et, n-Pr, t-Bu, CH2CH=CH2, Bn] were prepared via rhodium-catalyzed C-H activation/annulation of diazo compounds with Boc-protected benzamide substrates. The tert-Bu formylcarbamate group formally served as an oxidizing DG using the C-N bond as an internal oxidant. In this strategy, the novel Boc-amide groups as removable directing groups enabled the benzamides to construct C-C/C-O bonds to provide isocoumarins I.Ethyl 3-oxopentanoate(cas: 4949-44-4Safety of Ethyl 3-oxopentanoate) was used in this study.

Ethyl 3-oxopentanoate(cas: 4949-44-4) belongs to ketone compounds. They are most widely used as solvents, especially in industries manufacturing explosives, lacquers, paints, and textiles. Ketones are also used in tanning, as preservatives, and in hydraulic fluids.Safety of Ethyl 3-oxopentanoate

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

The author of 《Eco-friendly decarboxylative cyclization in water: practical access to the anti-malarial 4-quinolones》 were Ma, Yue; Zhu, Yongping; Zhang, Dong; Meng, Yuqing; Tang, Tian; Wang, Kun; Ma, Ji; Wang, Jigang; Sun, Peng. And the article was published in Green Chemistry in 2019. Synthetic Route of C7H12O3 The author mentioned the following in the article:

An environmentally benign decarboxylative cyclization in water has been developed to synthesize 4-quinolones I [R1 = H, 6-Me, 7-Br, 5-Cl, etc.; R2 = Me, Ph, Et, etc.; R3 = C(O)OCH2CH3, C(O)OCH2C6H5, C(O)CH3, etc.] from readily available isatoic anhydrides II and 1,3-dicarbonyl compounds R2C(O)CH2R3. Isatins III (R4 = H, 5-Me, 6-Br, 4-Cl, etc.) are also compatible for the reaction to generate 4-quinolones I in the presence of TBHP in DMSO. This protocol provides excellent yields under mild conditions for a broad scope of 4-quinolones I, and has good functional group tolerance. Only un-harmful carbon dioxide and water are released in this procedure. Moreover, the newly synthesized products have also been selected for anti-malarial examination against the chloroquine drug-sensitive Plasmodium falciparum 3D7 strain. Compound I [R1 = H; R2 = 4-C6H5CH2OC6H4; R3 = C(O)OCH2CH3] is found to display excellent anti-malarial activity with an IC50 value of 33 nM. The results came from multiple reactions, including the reaction of Ethyl 3-oxopentanoate(cas: 4949-44-4Synthetic Route of C7H12O3)

Ethyl 3-oxopentanoate(cas: 4949-44-4) belongs to ketone compounds. They are most widely used as solvents, especially in industries manufacturing explosives, lacquers, paints, and textiles. Ketones are also used in tanning, as preservatives, and in hydraulic fluids.Synthetic Route of C7H12O3

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

In 2019,Synlett included an article by Yamamoto, Kosuke; Ishimaru, Keiko; Mizuta, Satoshi; Minato, Daishirou; Kuriyama, Masami; Onomura, Osamu. Reference of Diethyl 2-methylmalonate. The article was titled 《Diastereodivergent Synthesis of Bromoiminolactones: Electrochemical and Chemical Bromoiminolactonization of α-Allylmalonamides》. The information in the text is summarized as follows:

A diastereodivergent synthesis of N-substituted iminolactones I, II (R1 = Me, Et, Ph, etc.; R2 = Ph, cyclohexyl, benzyl, etc.) by bromoiminolactonization of α-substituted α-allylmalonamides R1C(CH2CH=CH2)(C(O)NHR2)2 is reported. Whereas bromocyclization under conventional chem. conditions provided cis-bromoiminolactones I, and electrochem. conditions exhibited complementary diastereoselectivity to afford the trans-products II. A variety of substituents on the nitrogen atoms and an α-position of the malonamide were tolerated under both sets of conditions to afford the corresponding iminolactones I, II in excellent yields and high diastereoselectivities. In the experiment, the researchers used Diethyl 2-methylmalonate(cas: 609-08-5Reference of Diethyl 2-methylmalonate)

Diethyl 2-methylmalonate(cas: 609-08-5) belongs to aliphatic hydrocarbons. Aliphatic hydrocarbons belong to the most abundant fraction in crude oil. Aliphatics molecules are linear or branched open-chain structures such as n-alkanes, isoalkanes, cycloalkanes (naphthenes), terpenes and steranes.Reference of Diethyl 2-methylmalonate

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

In 2017,Wang, Xinran; Lin, Xuehua; Xu, Xuanqi; Li, Wei; Hao, Lijuan; Liu, Chunchi; Zhao, Dongmei; Cheng, Maosheng published 《Design, synthesis, and biological evaluation of N,N-disubstituted-4-arylthiazole-2-methylamine derivatives as cholesteryl ester transfer inhibitors》.Molecules published the findings.Reference of Ethyl 2-amino-2-thioxoacetate The information in the text is summarized as follows:

Cholesteryl ester transfer protein (CETP) has been identified as a potential target for cardiovascular disease (CVD) for its important role in the reverse cholesteryl transfer (RCT) process. In the previous work, compound I was discovered as a moderate CETP inhibitor. The replacement of the amide linker of compound I by heterocyclic aromatics a series of N,N-substituted-4-arylthiazole-2-methylamine derivatives II (R1 = 3-OMe, 3-OCF3, 4-Ph, etc.; R2 = H, 4-F, 4-NO2, etc.) were designed by utilizing a conformational restriction strategy. Thirty-six compounds were synthesized and evaluated for their CETP inhibitory activities. Structure-activity relationship studies indicate that electron donor groups substituted ring A, and electron-withdrawing groups at the 4-position of ring B were critical for potency. Among these compounds, II (R1 = 3,4-(OMe)2; R2 = 4-NO2) exhibited excellent CETP inhibitory activity (IC50 = 0.79 +/- 0.02 μM) in vitro and showed an acceptable metabolic stability. The experimental process involved the reaction of Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1Reference of Ethyl 2-amino-2-thioxoacetate)

Ethyl 2-amino-2-thioxoacetate(cas: 16982-21-1) belongs to anime. Hydrogen peroxide (H2O2) and peroxy acids generally add an oxygen atom to the nitrogen of amines. With primary amines, this step is normally followed by further oxidation, leading to nitroso compounds, RNO, or nitro compounds, RNO2. Secondary amines are converted to hydroxylamines, R2NOH, and tertiary amines to amine oxides, R3NO.Reference of Ethyl 2-amino-2-thioxoacetate

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

In 2015,Wang, Yuran; Vogelgsang, Ferdinand; Roman-Leshkov, Yuriy published 《Acid-catalyzed oxidation of levulinate derivatives to succinates under mild conditions》.ChemCatChem published the findings.Electric Literature of C4H8O3 The information in the text is summarized as follows:

Here we report on the oxidation of Me levulinate into di-Me succinate with peroxides under mild conditions using Bronsted and Lewis acid catalysts. Selectivities to succinate and acetate derivatives of approx. 60 and 40 %, resp., were obtained with strong Bronsted acids in methanol. Although the mol. structure (i.e., carbon-chain length and branching around the C=O group) and the oxidant type affect the product distribution, solvent choice has the strongest impact on changing the location of oxygen insertion into the carbon backbone. Specifically, switching the solvent from methanol to heptane resulted in a decrease in the succinate/acetate ratio from 1.6 to 0.3. In contrast to Bronsted acids, we demonstrate that the nature of the metal cation is responsible for changing the reaction selectivity of water-tolerant Lewis acidic triflate salts. In the experimental materials used by the author, we found Methyl 3-hydroxypropanoate(cas: 6149-41-3Electric Literature of C4H8O3)

Methyl 3-hydroxypropanoate(cas: 6149-41-3) belongs to esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Electric Literature of C4H8O3

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

In 2012,Song, Hao; Zhao, Yongjie; Zhang, Yingxin; Kong, Weibao; Xia, Chungu published 《Synthesis of polyhydroxyalkanoates by polymerization of methyl 3-hydroxypropionate in the catalysis of lipase》.Cuihua Xuebao published the findings.Safety of Methyl 3-hydroxypropanoate The information in the text is summarized as follows:

The polymerization of Me 3-hydroxypropionate as monomer catalyzed by lipase was selected as a model system in this study. The monomer with the purity around 95% could be polymerized to polyhydroxyalkanoates in the catalysis of Novozym 435. Decreasing the reaction pressure would result in the increase of product yield and high mol. weight By choosing appropriate organic solvents, surfactants and reaction pressure, the mol. weight of polyhydroxy propionate polyester could be controlled from 1800 to 13000 (Mw value). The reusing ability of enzymic catalyst was comparatively good. The relative activity could be maintained above 95% after 6 repeated batches reaction. In the experimental materials used by the author, we found Methyl 3-hydroxypropanoate(cas: 6149-41-3Safety of Methyl 3-hydroxypropanoate)

Methyl 3-hydroxypropanoate(cas: 6149-41-3) belongs to esters with low molecular weight are commonly used as fragrances and found in essential oils and pheromones. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Safety of Methyl 3-hydroxypropanoate

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