Esters-buliding-blocks

Asymmetric synthesis of D– and L-mannosamine was written by O’Neill, A. N.. And the article was included in Canadian Journal of Chemistry in 1959.Related Products of 6730-10-5 This article mentions the following:

D-Mannosamine-HCl (I) was prepared in four steps from D-arabino-tetraacetoxy-1-nitro-1-hexene (D-II). The critical step involved the stereo-specific addition of NH₃ to D-II. The steric course of the addition was discussed in terms of the Cram rule. Powd. D-II was added slowly to a saturated solution of NH₃ in absolute MeOH and left at 5鎺?for 18 h. Concentration in vacuo gave 82% N-acetyl-1-deoxy-1-nitro-D-mannosaminol (D-III), m. 172-3鎺?(MeOH), [浼猐²⁴_D -13.2鎺?(c 1.1, H₂O), main IR bands given. Similarly, L-II gave L-III, m. 172.0-2.5鎺? [浼猐²⁴_D 14.9鎺?(c 1.5, H₂O). A cold solution of 10 g. D-III in 25 mL. 2N NaOH was added dropwise to a cold solution of 12 mL. H₂SO₄ in 15 mL. H₂O while the temperature was maintained at 10-5鎺? The solution was neutralized with warm aqueous Ba(OH)₂ and the filtrate was concentrated in vacuo. The residue was dried in vacuo over P₂O₅ and then treated with 125 mL. Ac₂O and 100 mL. pyridine at 0鎺?for 3 days. The mixture was poured onto 500 mL. ice and H₂O and extracted with CHCl₃. The CHCl₃ extract was washed, dried, and concentrated in vacuo to afford 13 g. 2-acetamido-1,3,4,6-tetra-O-acetyl-2-deoxy-灏?D-mannose (D-IV), m. 162-3鎺?(EtOH-Et₂O), [浼猐²⁴_D -17.0 (c 1.8, CHCl₃). Similarly, L-III afforded L-IV, m. 162-3鎺? [浼猐²⁵_D 18.0鎺?(c 1.1, CHCl₃). Treating 0.200 g. D-IV with hot dilute HCl yielded 0.107 g. I, [浼猐²⁵_D -4 (c 1.0, 3% HCl). A cold solution of 10 g. D-IV in 150 mL. absolute MeOH was treated with 0.4N Ba(OH)₂ 24 h. at 0鎺? An equal volume H₂O was added and the solution was shaken with IR-120 and IR-45 Amberlite resins. The filtrate was concentrated in vacuo to afford 5.0 g. sirup (V) and 0.75 g. 2-acetamido-2-deoxy-D-glucose (VI), m. 193-6鎺?(EtOH-Et₂O) with decomposition starting at 185鎺? [浼猐²⁶_D 75.0鎺?(c 1.2, H₂O), with mutarotation. A solution of 0.100 g. VI in 1 mL. 2N HCl was heated at 100鎺?for 2 h. to give 0.093 g, D-glucosamine-HCl (VII), [浼猐²⁵_D 82.4鎺?(c 0.91, H₂O) with mutarotation. Treating V with aqueous HCl afforded VII, [浼猐²⁵_D 98鎺?(c 1.1, H₂O) with mutarotation, and a small amount of I, [浼猐²⁶_D -4鎺?(c 1.0, 2.5% aqueous HCl). An aqueous solution of 80 g. VII was oxidized with 200 g. yellow H₂O to provide 50% D-glucosaminic acid (VIII), [浼猐²⁵_D -14鎺?(c 1.3, 2.5% aqueous HCl). A solution of 40 g. VIII in 400 mL. H₂O and 40 mL. pyridine was heated at 100鎺?for 24 h. to yield D-mannosaminic acid (IX), [浼猐²⁴_D 10鎺?(c 1.5, 2.5% aqueous HCl). Treating IX with alc. HCl afforded 75% IX lactone, [浼猐²⁴_D 45鎺?(c 1.4, H₂O). The IX lactone was reduced with 2.5% Na-Hg to give 60% I, [浼猐²⁴_D -4.0鎺?(c 2.0, 2.5% aqueous HCl); pentaacetate m. 161-2鎺? [浼猐²⁴_D -18鎺?(c 1.5, CHCl₃). In the experiment, the researchers used many compounds, for example, (2S,3S,4R,5S,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate (cas: 6730-10-5Related Products of 6730-10-5).

(2S,3S,4R,5S,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate (cas: 6730-10-5) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Related Products of 6730-10-5

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

Interaction of phenolic acids and their derivatives with human serum albumin structure-affinity relationships and effects on antioxidant activity was written by Zhang, Yunyue;Wu, Simin;Qin, Yinghui;Liu, Jiaxin;Liu, Jingwen;Wang, Qingyu;Ren, Fazheng;Zhang, Hao. And the article was included in Food Chemistry in 2018.Product Details of 81245-24-1 This article mentions the following:

In this study, 111 phenolic acids and their derivatives were chosen to investigate their structure-affinity relationships when binding to human serum albumin (HSA), and effects on their antioxidant activity. A comprehensive math. model was employed to calculate the binding constants, using a fluorescence quenching method, and this was corrected for the inner-filter effect to improve accuracy. We found that a hydroxy group at the 2-position of the benzene ring exerted a pos. effect on the affinities, while a 4-hydroxy substituent had a neg. influence. Both methylation of the hydroxy groups and replacing the hydroxy groups with Me groups at the 3- and 4-positions of the benzene ring enhanced the binding affinities. Hydrophobic force and hydrogen bonding were binding forces for the phenolic acids, and their Me esters, resp. The antioxidant activity of the HSA-phenolic acid interaction compounds was higher than that of the phenolic acids alone. In the experiment, the researchers used many compounds, for example, Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1Product Details of 81245-24-1).

Methyl 2-methoxy-4-methylbenzoate (cas: 81245-24-1) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Product Details of 81245-24-1

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

Search for compounds with hypoglycemic activity in the series of 1-[2-(1H-tetrazol-5-yl)-R1-phenyl]-3-R2-phenyl(ethyl)ureas and R1-tetrazolo[1,5-c]quinazolin-5(6H)-ones was written by Antypenko, Oleksii M.;Kovalenko, Sergiy I.;Zhernova, Galina O.. And the article was included in Scientia Pharmaceutica in 2016.Recommanded Product: 3-Cyanophenylisocyanate This article mentions the following:

Methods of 1-[2-(1H-tetrazol-5-yl)-R1-phenyl]-3-R2-phenyl(ethyl)ureas and R1-tetrazolo[1,5-c]quinazolin-5(6H)-ones synthesis were designed. IR, LC-MS, 1H-NMR, and elemental anal. data evaluated the structure and purity of the obtained compounds Different products, depending on the reaction conditions, were distinguished and discussed. The preliminary hypoglycemic activity of 36 synthesized compounds was revealed. Docking studies to 11灏?hydroxysteroid dehydrogenase 1, 绾?peroxisome proliferator-activated receptor, and dipeptidyl peptidase-4 were conducted. Eight of these substances were further tested on glucocorticoid-induced insulin resistance models, namely glucose tolerance, oral rapid insulin, and adrenalin tests. One of the most active compounds turned out to be tetrazolo[1,5-c]quinazolin-5(6H)-one 3.1, exceeding the reference drugs Metformin (50 and 200 mg/kg) and Gliclazide (50 mg/kg). In the experiment, the researchers used many compounds, for example, 3-Cyanophenylisocyanate (cas: 16413-26-6Recommanded Product: 3-Cyanophenylisocyanate).

3-Cyanophenylisocyanate (cas: 16413-26-6) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Recommanded Product: 3-Cyanophenylisocyanate

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

Comparative study of volatile compounds in the fruit of two banana cultivars at different ripening stages was written by Zhu, Xiaoyang;Li, Qiumian;Li, Jun;Luo, Jun;Chen, Weixin;Li, Xueping. And the article was included in Molecules in 2018.Computed Properties of C10H20O2 This article mentions the following:

Aromatic compounds are important for fruit quality and can vary among fruit cultivars. Volatile compounds formed during the ripening of two banana cultivars, Brazilian and Fenjiao, were determined using headspace solid-phase micro-extraction (SPME) and gas chromatog. coupled with mass spectrometry (GC-MS). These two cultivars exhibited different physiol. characteristics during storage. Fenjiao fruit exhibited faster yellowing and softening, a higher respiration rate and greater ethylene production Also, the soluble sugar content in Fenjiao fruit was much higher than in Brazilian fruit. In total, 62 and 59 volatile compounds were detected in Fenjiao and Brazilian fruits, resp. The predominant volatile components isoamyl acetate, butanoic acid, 3-methyl-3-methylbutyl ester, hexanal, trans-2-hexenal and 1-hexanol varied during ripening stages. Moreover, esters were more abundant in Fenjiao, and propanoic acid 2-methylbutyl ester, and octanoic acid were only detected in Fenjiao. These compounds contribute to the unique flavors and aromas of the two cultivars. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Computed Properties of C10H20O2).

Isopentyl 3-methylbutanoate (cas: 659-70-1) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Computed Properties of C10H20O2

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

A chemometric approach to compare Portuguese native hops with worldwide commercial varieties was written by Martins, Zita E.;Machado, Julio C. Jr.;Cunha, Sara C.;Barata, Ana Maria;Ferreira, Isabel M. P. L. V. O.. And the article was included in Journal of Chemometrics in 2020.Application of 868-57-5 This article mentions the following:

A diversity of native hops can be found in Portugal, but little is known concerning their volatile and sensory profiles. Nowadays, the exponential growth of the craft beer sector and the preference for more flavoured beers promote the research of unexplored wild hops that have the advantage of being well adapted to the Portuguese edaphoclimatic conditions. Therefore, the goal of this study was to characterize the volatile profile of 75 native Portuguese hops and compare with 34 com. varieties by means of headspace solid-phase microextraction gas chromatog./mass spectrometry (HS-SPME-GC/MS), in order to select those that present similarities with commercialized hops and confirm by check-all-that-apply (CATA) anal. if they present similar organoleptic characteristics. Due to the complexity of hop volatile profile and the great number of samples analyzed, robust chemometric treatment of chromatog. and sensorial data was required to make reliable conclusions. Twelve Portuguese hops present a volatile profile and sensory characteristics quite similar to some com. varieties, because 11 Portuguese hops were grouped with the European varieties Challenger, Hallertauer Magnum and Perle, both in volatile profile and sensory anal. and one clustered with American registered varieties. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Application of 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Application of 868-57-5

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

Characteristic Volatile Fingerprints of Four Chrysanthemum Teas Determined by HS-GC-IMS was written by Wang, Zhiling;Yuan, Yixin;Hong, Bo;Zhao, Xin;Gu, Zhaoyu. And the article was included in Molecules in 2021.Application In Synthesis of Methyl2-methylbutyrate This article mentions the following:

Volatile composition is an important feature that determines flavor, which actively affects the overall evaluation of chrysanthemum tea. In this study, HS-GC-IMS (headspace-gas chromatog.-ion mobility spectrometry) was performed to characterize the volatile profiles of different chrysanthemum tea subtypes. Forty-seven volatiles of diverse chem. nature were identified and quantified. Partial least squares discriminant anal. (PLS-DA) revealed that four chrysanthemum teas were distinct from each other based on their volatile compounds Furthermore, this work provides reference methods for detecting novel volatile organic compounds in chrysanthemum tea plants and products. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Application In Synthesis of Methyl2-methylbutyrate).

Methyl2-methylbutyrate (cas: 868-57-5) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Application In Synthesis of Methyl2-methylbutyrate

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

Significance of Hydrogen Bonding at the S₁‘ Subsite of Calpain I was written by Donkor, I. O.;Zheng, X.;Han, J.;Lacy, C.;Miller, D.. And the article was included in Bioorganic & Medicinal Chemistry Letters in 2001.Name: (S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate This article mentions the following:

浼?Ketohydroxamates were synthesized as bioisosteres of 浼?ketoamides. The 浼?ketohydroxamates were generally more potent than the corresponding 浼?ketoamides. The potency of the compounds suggests that hydrogen bonding and steric bulk of substituents on the nitrogen atom of the ketoamide moiety influence calpain inhibition. In the experiment, the researchers used many compounds, for example, (S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate (cas: 87694-53-9Name: (S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate).

(S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate (cas: 87694-53-9) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Name: (S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate

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

Study of phase separation behavior of poly(N,N-diethylacrylamide) in aqueous solution prepared by RAFT polymerization was written by Wu, Mei;Zhang, Haibing;Liu, Hongliang. And the article was included in Polymer Bulletin (Heidelberg, Germany) in 2019.Related Products of 27249-90-7 This article mentions the following:

A series of poly(N,N-diethylacrylamide) samples with low mol. weights (1.9 鑴?10³-5.3 鑴?10⁴) and narrow polydispersities (below 1.5 and usually lower than 1.25) was synthesized by reversible addition-fragmentation chain transfer polymerization The phase separation behavior of poly(N,N-diethylacrylamide) in aqueous solution was investigated by turbidimetry, fluorescent probe technol. and DSC. It is interesting to find that the lower critical solution temperature (LCST) of the samples increases with increasing mol. weight and remains more or less a constant above a critical mol. weight of 1.2 鑴?10⁴. At the same time, an inverse dependence of LCST on the concentration was found and this effect was more pronounced for lower mol. weight To further investigate the novel mol. weight dependence of the LCST, the fluorescent probe study was conducted and the exptl. results demonstrated that there was an increase in hydrophobicity when decreasing the mol. weight and increasing the concentration and flower-like micelles were probably formed which can further be proved by TEM. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Related Products of 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Related Products of 27249-90-7

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

Ynamide-Mediated Thionoester and Dithioester Syntheses was written by Yao, Chaochao;Yang, Jinhua;Lu, Xiaobiao;Zhang, Shuyu;Zhao, Junfeng. And the article was included in Organic Letters in 2020.Recommanded Product: Benzyl benzodithioate This article mentions the following:

A novel ynamide-mediated synthesis of thionoesters and dithioesters is described. The selective addition reactions of various monothiocarboxylic acids with ynamide furnish 浼?thioacyloxyenamides, which undergo transesterification with nucleophilic -OH or -SH species to afford thionoesters and dithioesters, resp. The broad substrate scope, mild reaction conditions, and excellent yields make this method an attractive synthetic approach to thionoesters and dithioesters. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Recommanded Product: Benzyl benzodithioate).

Benzyl benzodithioate (cas: 27249-90-7) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Recommanded Product: Benzyl benzodithioate

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

Synthesis of a complete series of C-4 fluorinated Phe-Gly mimetics was written by Berts, Wei;Luthman, Kristina. And the article was included in Tetrahedron in 1999.HPLC of Formula: 87694-53-9 This article mentions the following:

The complete series of allylic monofluorinated derivatives I (R¹ = H, R² = F; R¹ = F, R² = H) and difluorinated derivatives II of Boc-Phe-Gly-OMe has been synthesized using facile methods. The saturated derivatives of I and II were also synthesized. Diastereomeric allylic alc. derivatives were used as key intermediates. Cis- and trans-aziridine derivatives were synthesized in high yields from the diastereomeric alcs. using Mitsunobu conditions. The aziridines were treated with diethylaminosulfur trifluoride (DAST) at room temperature, which resulted in stereoselective ring openings yielding the monofluorinated derivatives The difluorinated isostere was synthesized from the 绾?keto ester derivative using DAST. In the experiment, the researchers used many compounds, for example, (S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate (cas: 87694-53-9HPLC of Formula: 87694-53-9).

(S)-tert-Butyl (1-(methoxy(methyl)amino)-1-oxo-3-phenylpropan-2-yl)carbamate (cas: 87694-53-9) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.HPLC of Formula: 87694-53-9

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