Tag: 100-200

On August 31, 2022, Cheng, Zao; Gao, Junfei; Liu, Qianqian; Gu, Qun published an article.Name: (R)-Methyl 3-hydroxybutanoate The title of the article was The effect of alkyl chain length of (R)-3-Hydroxybutyric alkyl ester on antibacterial activity and its antibacterial mechanism. And the article contained the following:

This work describes the relationship between the antibacterial activity and the ester chain length (C1-C8) of (R)-3-Hydroxybutyric ((R)-3-HB) alkyl esters that synthesized from (R)-3-HB acid ((R)-3-HBA) by esterification reaction. The min. inhibitory concentration (MIC) and min. bactericidal concentration (MBC) decrease as the length of the (R)-3-HB alkyl ester chain increases from 1 to 6, but (R)-3-HB-C7 and (R)-3-HB-C8 have their own rules for different microorganisms. Among them, the (R)-3HB-C6 has the relatively best antibacterial and antifungal properties, which MIC were 1.95 mg mL-1 against E. coli and S. aureus; 0.98 mg mL-1 against C. albicans and B. subtilis; 0.49 mg mL-1 against A. niger. Finally, the antimicrobial mechanisms of the (R)-3HB-C6 are revealed, and these include disruption of biofilm and the bacterial wall/membrane, leakage of the intracellular content, and change in the transmembrane potential. These results imply the potential application of (R)-3-HB alkyl ester as new antimicrobial agents; future research can use this as an antibacterial element to synthesize new polymer materials or agents with high-efficiency antibacterial activity. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Name: (R)-Methyl 3-hydroxybutanoate

The Article related to hydroxybutyric alkyl ester chain length antibacterial activity mechanism, antibacterial mechanism, antimicrobials agents, chain length, esterification, polyhydroxyalkanoates and other aspects.Name: (R)-Methyl 3-hydroxybutanoate

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

On August 28, 2019, Huang, Ya Nan; Fan, Long Fei; Rong, Min Zhi; Zhang, Ming Qiu; Gao, Yu Ming published an article.Product Details of 517-23-7 The title of the article was External Stress-Free Reversible Multiple Shape Memory Polymers. And the article contained the following:

The present work is focused on developing external stress-free two-way triple shape memory polymers (SMPs). Accordingly, a series of innovative approaches are proposed for the material design and preparation Polyurethane prepolymers carrying crystalline polytetrahydrofuran (PTMEG) and poly(ε-caprolactone) (PCL) as the switching phases are resp. synthesized in advance and then crosslinked to produce the target material. The stepwise method is believed to be conducive to manipulation of the relative contribution of PCL and PTMEG. Moreover, the chain extender, 2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol (UPy), is incorporated to establish hydrogen bonds among the macromols. By straightforward stretching treatment at different temperatures, the hydrogen bond networks are successfully converted into an internal stress provider, which overcomes the challenge of stress relaxation of the melted low melting temperature polymer (i.e., PTMEG) and increases the efficiency of stress transfer. Meanwhile, the contraction force of the switching phases is tuned to match the internal tensile stress. As a result, the internal stress provider can closely collaborate with melting/recrystallization of the crystalline domains, leading to the repeated multiple shape memory effects. The crosslinked polyurethane is thus able to reversibly morph among three shapes and displays its potentials as soft robot and actuator. The strategy reported here has the advantages of easily accessible raw materials, simple reaction, and facile programing/deprograming/reprograming, so that it possesses wide applicability. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Product Details of 517-23-7

The Article related to shape memory polyurethane synthesis robot actuator, hydrogen bonds, multiple shape memory polymer, polyurethane, reversible shape memory effect, two-way shape memory effect and other aspects.Product Details of 517-23-7

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

On September 1, 2021, Matsumoto, Akira; Shiozaki, Yoko; Sakurai, Shunya; Maruoka, Keiji published an article.Computed Properties of 10472-24-9 The title of the article was Synthesis of Functionalized Aliphatic Acid Esters via the Generation of Alkyl Radicals from Silylperoxyacetals. And the article contained the following:

We describe a catalytic method for the synthesis of a variety of functionalized aliphatic acid esters using silylperoxyacetals, which are versatile alkyl radical precursors with a terminal ester moiety. In the presence of an appropriate transition-metal catalyst, the in situ generation of alkyl radicals and the subsequent bond-forming process proceeds smoothly to afford synthetically valuable aliphatic acid derivatives [e.g., silylperoxyacetal I + PhCONH2 → II (83%) in presence of CuI/1,10-phenanthroline]. The present method can be applied to the efficient synthesis of a pharmaceutically important 1,1-diarylalkane motif. In addition, a novel strategy for the synthesis of structurally diverse hydroxy acid derivatives via a C-O bond formation process that utilizes TEMPO has been developed. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Computed Properties of 10472-24-9

The Article related to aliphatic acid ester synthesis silylperoxy acetal alkyl radical generation, c−c bond cleavage, alkyl radicals, hydroxy acids, iron-catalysis, silylperoxyacetals, β-scission and other aspects.Computed Properties of 10472-24-9

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

On October 15, 2019, Lei, Hongrui; Jia, Fang; Cao, Meng; Wang, Jie; Guo, Ming; Zhu, Minglin; Zuo, Daiying; Zhai, Xin published an article.Synthetic Route of 10472-24-9 The title of the article was An exploration of solvent-front region high affinity moiety leading to novel potent ALK & ROS1 dual inhibitors with mutant-combating effects. And the article contained the following:

The pyrimidine-2,4-diamine analogs exerted excellent activities in down-regulation of ALK phosphorylation. However, the prevalent drug-resistant site-mutation has gradually prevented the agents from being widely used. Herein, we conducted an exploration of high affinity moiety that bound to the solvent-front region (G1202R located) within the ATP binding site of ALK leading to the synthesis of thirty-five pyrimidine-2,4-diamine derivatives Among these compounds, urea group was extensively derivatized which finally resulted in the identification of the ‘semi-free urea’ compound 39. All compounds were assayed cytotoxicity and enzymic activities and 39 turned out to be the most potent one with IC50 values of 2.1, 0.91, 4.3 and 0.73 nM towards ALKwt, ALKL1196M, ALKG1202R and ROS1, resp. The performances of 39 on ALK- & ROS1-dependent cell lines were in good accordance with enzymic activities with IC50 values below 0.06μM. Besides, 39 induced cell apoptosis in a dose-dependent manner in H2228 cells. Finally, the binding models of 39 with ALKwt, ROS1, ALKL1196M and ALKG1202R were ideally established which further clearly elucidated their mode of action within the active site. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Synthetic Route of 10472-24-9

The Article related to pyrimidine diamine derivative preparation alk ros1 inhibitor resistant cancer, 4-diamine, alk & ros1 inhibitors, apoptosis-inducing, mutation-combating, pyrimidine-2, solvent front and other aspects.Synthetic Route of 10472-24-9

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

On April 30, 2021, Zhou, Shiyang; Zou, Huiying; Huang, Gangliang; Chen, Guangying; Zhou, Xueming; Huang, Shuheng published an article.Recommanded Product: Methyl 2-cyclopentanonecarboxylate The title of the article was Design, synthesis and anti-rheumatoid arthritis evaluation of double-ring conjugated enones. And the article contained the following:

Four series of double-ring conjugated enones were designed, synthesized and studied for the inhibition of synovial cell activity through the modification of Dysodensiol K core structure, double-ring, double-bond and double-carbonyl groups. For the in vitro synovial cell assay of rats, compound I and II exhibited good inhibitory activities, with IC50 values of 2.71 ± 0.18 and 2.68 ± 0.16μM, resp. At the same time, the LDH release and LD50 test results revealed that the target compounds had low cytotoxicity and acute toxicity. For the in vivo CIA model test through oral administration, compounds I and II exhibited a similar effect to pos. control group methotrexate. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Recommanded Product: Methyl 2-cyclopentanonecarboxylate

The Article related to dysodensiol k analog preparation antirheumatoid arthritis, synovial cell activity inhibitor dysodensiol k analog, conjugated enones, design, modification, synovial cell, synthesis and other aspects.Recommanded Product: Methyl 2-cyclopentanonecarboxylate

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

Ensari, Yunus; Dhoke, Gaurao V.; Davari, Mehdi D.; Bocola, Marco; Ruff, Anna Joelle; Schwaneberg, Ulrich published an article in 2017, the title of the article was Inversion of cpADH5 Enantiopreference and Altered Chain Length Specificity for Methyl 3-Hydroxyalkanoates.SDS of cas: 3976-69-0 And the article contains the following content:

Expanding the substrate scope of enzymes opens up new routes for synthesis of valuable chems. Ketone-functionalized fatty acid derivatives and corresponding chiral alcs. are valuable building blocks for the synthesis of a variety of chems. including pharmaceuticals. The alc. dehydrogenase from Candida parapsilosis (cpADH5) catalyzes the reversible oxidations of chiral alcs. and has a broad substrate range; a challenge for cpADH5 is to convert alcs. with small substituents (Me or ethyl) next to the oxidized alc. moiety. Mol. docking studies revealed that W286 is located in the small binding pocket and limits the access to substrates that contain aliphatic chains longer than Et substituent. In the current manuscript, we report that positions L119 and W286 are key residues to boost oxidation of medium chain Me 3-hydroxy fatty acids; interestingly the enantiopreference toward Me 3-hydroxybutyrate was inverted. Kinetic characterization of W286A showed a 5.5 fold increase of Vmax and a 9.6 fold decrease of Km values toward Me 3-hydroxyhexanoate (Vmax: 2.48 U mg- and Km: 4.76 mM). Simultaneous saturation at positions 119 and 286 library yielded a double mutant (L119M/W286S) with more than 30-fold improved activity toward Me 3-hydroxyoctanoate (WT: no conversion; L119M/W286S: 30 %) and inverted enantiopreference (S-enantiomer ≥99 % activity decrease and R-enantiomer >20-fold activity improvement) toward Me 3-hydroxybutyrate. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).SDS of cas: 3976-69-0

The Article related to cpadh5 enantiopreference altered length methyl hydroxyalkanoate, alcohol dehydrogenase, directed evolution, fatty acid methyl ester, methyl 3-hydroxyalkanoate, protein engineering and other aspects.SDS of cas: 3976-69-0

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

Jungen, Stefan; Chen, Peter published an article in 2018, the title of the article was Alkyl Radical Generation by an Intramolecular Homolytic Substitution Reaction between Iron(II) and Trialkylsulfonium Groups.Related Products of 6038-19-3 And the article contains the following content:

Intramol., homolytic substitution reactions between iron(II) species and various trialkylsulfonium groups were directly observed in the gas phase upon collision-induced dissociation (CID). In spite of the notoriously low reduction potential of trialkylsulfonium species and the mismatched oxidation potential of iron(II), the reactions proceed at moderate collision energies, forming an alkyl radical as well as a thioether coordinated to the iron. In contrast to classical homolytic substitutions, the attacking radical is a “metalloradical”, namely iron(II) that is oxidized to iron(III) during the reaction. With this process we demonstrate that the conceptually analogous, putative radical generation step in radical S-adenosyl methionine (SAM) enzymes is possible and plausible. Further, we show that this kind of reaction only occurs in constrained systems with a defined geometry. Combining exptl. measurements with DFT studies and NBO analyses allowed us to gain insights into the reactivity and transition states of these systems. Based on our findings, we challenge the notion of a collinear transition state in the radical generation step of radical SAM enzymes and propose it to be bent instead. The experimental process involved the reaction of 3-Aminodihydrothiophen-2(3H)-one hydrochloride(cas: 6038-19-3).Related Products of 6038-19-3

The Article related to iron metalloradical reductive cleavage trialkylsulfonium intramol homolytic substitution, esi-ms, homolytic substitution, iron, transition-state geometry, trialkylsulfonium groups and other aspects.Related Products of 6038-19-3

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

On January 30, 2014, Peng, Peng; Xiong, De-Cai; Ye, Xin-Shan published an article.Safety of (Trimethoxymethyl)benzene The title of the article was ortho-Methylphenylthioglycosides as glycosyl building blocks for preactivation-based oligosaccharide synthesis. And the article contained the following:

Thioglycosides are widely used in orthogonal glycosylation, armed-disarmed chemoselective glycosylation, and preactivation-based glycosylation. Nevertheless, aglycon transfer occasionally occurred in the glycosylation process of thioglycosides. This problem was also encountered in preactivation-based reactions, which limited the applications of preactivation-based glycosylation to some extent. To tackle this problem, sterically hindered aglycon ortho-methylphenylthioglycosides were introduced as glycosyl building blocks. These thioglycosides prevented the aglycon transfer and enhanced the efficiency of glycosyl coupling reactions, especially in the reactions of disarmed donors with armed acceptors. Moreover, these thioglycosides were employed in preactivation-based one-pot oligosaccharide assembly. The experimental process involved the reaction of (Trimethoxymethyl)benzene(cas: 707-07-3).Safety of (Trimethoxymethyl)benzene

The Article related to ortho methylphenylthioglycoside synthesis preactivation glycosylation oligosaccharide, aglycon transfer, glycosylation, oligosaccharide, preactivation, o-methylphenylthioglycoside and other aspects.Safety of (Trimethoxymethyl)benzene

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

On October 27, 2014, Klitzke, Joice S.; Roisnel, Thierry; Kirillov, Evgeny; Casagrande, Osvaldo de L. Jr.; Carpentier, Jean-Francois published an article.Application In Synthesis of (R)-Methyl 3-hydroxybutanoate The title of the article was Discrete O-Lactate and β-Alkoxybutyrate Aluminum Pyridine-Bis(naphtholate) Complexes: Models for Mechanistic Investigations in the Ring-Opening Polymerization of Lactides and β-Lactones. And the article contained the following:

Me aluminum(III) complexes {ONOSiR3}AlMe (SiR3 = SiPh3 (2a), SiMe2tBu (2b)) were synthesized by reaction of AlMe3 with pyridine-bis(naphthol) proligands {ONOSiR3}H2 (1a,b) having bulky o-SiR3 substituents on the naphthol groups. Complexes 2a,b were converted into the Al isopropoxide, O-lactate, and β-alkoxybutyrate complexes {ONOSiR3}AlOR’ (R’ = iPr (3a), (S)-CH(Me)CO2iPr (4a,b), (R)-CH(Me)CH2CO2Me (5a), rac-CH(CF3)CH2CO2Et (6a)) by reaction with the corresponding alc. and α- and β-hydroxy esters R’OH. C-H···π close contacts between the SiPh3 Ph groups and hydrogens of the methine, methylene, and alkyl ester groups were evidenced by x-ray diffraction studies (for 2a and 4a-6a) and by solution NMR. In contrast to the case for (S)-4b, (S)-4a interacts reversibly with racemic lactide (rac-LA) in toluene-d8 at 20°, discriminating the L and D monomers, yet without forming isolable six-coordinated adducts. NMR monitoring of the reaction of (S)-4a with L-LA in CD2Cl2 at room temperature allowed identifying the propagation product 7a, as a result of propagation being faster than insertion. The same propagating species formed upon reaction of (S)-4a with L-LA in toluene-d8 at 80°. Conversely, the reaction of (R)-5a and L-LA in CD2Cl2 eventually allowed catching the very first insertion product 8a. These observations imply that insertion of LA proceeds more easily into a six-membered Al β-alkoxybutyrate species than into a five-membered Al O-lactate species. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Application In Synthesis of (R)-Methyl 3-hydroxybutanoate

The Article related to lactate beta alkoxybutyrate aluminum pyridine naphtholate preparation crystal structure, mechanistic ring opening polymerization lactide beta lactone aluminum pyridinenaphtholate and other aspects.Application In Synthesis of (R)-Methyl 3-hydroxybutanoate

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

Baumann, Thomas; Brueckner, Reinhard published an article in 2019, the title of the article was Atropselective Dibrominations of a 1,1′-Disubstituted 2,2′-Biindolyl with Diverging Point-to-Axial Asymmetric Inductions. Deriving 2,2′-Biindolyl-3,3′-diphosphane Ligands for Asymmetric Catalysis.Recommanded Product: (R)-Methyl 3-hydroxybutanoate And the article contains the following content:

On the 1H NMR timescale, 2,2′-biindolyls with (R)-configured (1-alkoxyprop)-2-yl, (1-hydroxyprop)-2-yl, or (1-siloxyprop)-2-yl substituents at C-1 and C-1′ are atropisomerically stable at <0° and interconvert at >30°. A 1,1′-Bis[(R)-1-hydroxyprop-2-yl]-2,2′-biindolyl a of that kind and achiral (!) brominating reagents gave the atropisomerically stable 3,3′-dibromobiindolyls (M)- and/or (P)-18 a at best atropselectively-because of point-to-axial asym. inductions-and atropdivergently, exhibiting up to 95% (M)- and as much (P)-atropselectivity. This route to atropisomerically pure biaryls is novel and should extend to other substrates and/or different functionalizations. The dibromobiindolyls (M)- and (P)-18 a furnished the biindolyldiphosphines (M)- and (P)-14 without atropisomerization. These syntheses did not require the resolution of a racemic mixture, which distinguishes them from virtually all biaryldiphosphine syntheses known to date. (M)- and (P)-14 acted as ligands in catalytic asym. allylations and hydrogenations. Remarkably, the Et tetralonecarboxylate was hydrogenated trans-selectively with 98% ee; this included a dynamic kinetic resolution The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Recommanded Product: (R)-Methyl 3-hydroxybutanoate

The Article related to atropselective dibromination disubstituted biindolyl biindolyldiphosphane ligand catalyst, asymmetric allylation, asymmetric hydrogenation, atropselectivity, biaryls, bromination and other aspects.Recommanded Product: (R)-Methyl 3-hydroxybutanoate

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