Category: catalyst-ligand

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, is researched, Molecular C5H8O3, CAS is 32780-06-6, about A ring-expansion route to analogs of dideoxyhydantocidin, the main research direction is dideoxy hydantocidin spirocyclic nucleoside preparation; dihydrofuranyllithium addition azetidinedione; hydroxy lactam acid catalyzed rearrangement.Reference of (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one.

The acid-catalyzed rearrangement of hydroxy β-lactam, formed by addition of the enantiopure dihydrofuranyllithium to N-benzyl-2,3-azetidinedione, has been investigated as a potential route to spirocyclic nucleosides.

There are many compounds similar to this compound(32780-06-6)Reference of (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one. if you want to know more, you can check out my other articles. I hope it will help you，maybe you’ll find some useful information.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

HPLC of Formula: 494-52-0. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: (S)-3-(Piperidin-2-yl)pyridine, is researched, Molecular C10H14N2, CAS is 494-52-0, about Synthesis and structured N-acyl and thiourea derivatives citizine and anabazine.

This work presents the results of studies on the chem. transformation of the alkaloids mols. anabasine and cytisine to obtain their N-cinnamoyl derivatives (N-cinnamoylanabasine, N-cinnamoylcytisine), as well as possible ways for their further modification. The optimal conditions for the preparation of N-cinnamoylcytisine and N-cinnamoylanabasine in the acylation reactions of alkaloids with cinnamoyl chloride are considered. Hydrazinolysis of the resulting N-cinnamoylcytisine and N-cinnamoylanabasine was carried out. It was shown that the interaction of acrylamide derivatives of alkaloids (N-cinnamoylanabasine, N-cinnamoylcytisine) with hydrazine hydrate in ethanol leads to the formation of the corresponding pyrazole derivatives (N-(5-phenyl-4,5-dihydro-1H-pyrazol-3-yl)anabasine, N-(5-phenyl-4,5-dihydro-1H-pyrazol-3-yl)cytisine) resulting from the intramol. cyclocondensation of hydrazones of N-cinnamoyl derivatives By the interaction of cinnamoylisothiocyanate with the above alkaloids (anabasine, cytisine), new thiourea derivatives (N- cinnamoylaminothiocarbonylanabasine, N- cinnamoylaminothiocarbonylcytisine) are synthesized.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

COA of Formula: C5H8O3. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, is researched, Molecular C5H8O3, CAS is 32780-06-6, about Chirospecific synthesis of (S)-(+)- and (R)-(-)-5-amino-4-hydroxypentanoic acid from L- and D-glutamic acid via (S)-(+)- and (R)-(-)-5-hydroxy-2-oxopiperidine. Author is Herdeis, C..

(S)-H2NCH2CH(OH)CH2CH2CO2H [(S)-I] was prepared stereospecifically from L-glutamic acid in 6 steps. Thus, L-glutamic acid was converted to lactone II (R = CO2H), which was reduced by H3B.S(Me)2 to give II (R = CH2OH), which was O-mesylated and then treated with NaN3 to give II (R = CH2N3). The latter was hydrogenated over Pd/C to give piperidine III, which was cleaved by aqueous Ba(OH)2 to give (S)-I. (R)-I was prepared analogously from D-glutamic acid.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: (S)-3-(Piperidin-2-yl)pyridine(SMILESS: C1(C=NC=CC=1)[C@@H]1CCCCN1,cas:494-52-0) is researched.COA of Formula: C5H8O3. The article 《Simultaneous determination of multiple components in cigarettes by mechanochemical extraction and direct analysis in real time mass spectrometry in minutes》 in relation to this compound, is published in Analytica Chimica Acta. Let’s take a look at the latest research on this compound (cas:494-52-0).

A simple, rapid and high throughput anal. approach with combination of mechanochem. extraction (MCE) and direct anal. in real time mass spectrometry (DART-MS) anal. was developed for the simultaneous determination of multiple chem. components in cigarette fillers. Different kinds of substances including nicotine, cigarette alkaloids, carbohydrates, organic acids, humectants and other additives were successfully extracted using MCE and detected by high resolution DART-MS. Six solvents of various polarities were compared during MCE process and significant differences were observed Different brands of cigarettes as well as standard research cigarette exhibited distinctive chem. features and DART-MS fingerprints. Principle component anal. showed clear differentiation among different cigarettes extracted with the same solvent and different solvent extracts of the same type of cigarette. The putative chem. formulas were proposed based on accurate m/z values with <10 ppm mass Errors. The relative contents of nicotine and other identified substances were compared and significant differences were observed among cigarettes of different locations. The whole procedure of MCE combined with DART-MS only takes minutes from raw cigarette fillers to obtaining the semi-quant. results. The operation is simple and high throughput, providing an efficient method to analyze cigarette composition, and to establish a methodol. to acquire the rapid cigarette fingerprints for quality control. There are many compounds similar to this compound(494-52-0)Reference of (S)-3-(Piperidin-2-yl)pyridine. if you want to know more, you can check out my other articles. I hope it will help you，maybe you’ll find some useful information.

Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Application In Synthesis of 11-Bromoundecanoic acid. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 11-Bromoundecanoic acid, is researched, Molecular C11H21BrO2, CAS is 2834-05-1, about pH-Responsive Behavior of Pickering Emulsions Stabilized by a Selenium-Containing Surfactant and Alumina Nanoparticles. Author is Yu, Shijie; Lv, Miao; Lu, Guoping; Cai, Chun; Jiang, Jianzhong; Cui, Zhenggang.

Herein, we describe pH-responsive Pickering emulsions stabilized by a sodium carboxylate-derived selenium surfactant (C10-Se-C10·(COONa)2) in combination with pos. charged alumina nanoparticles. Unlike other bola-type carboxylate surfactants (e.g., disodium eicosanoate), C10-Se-C10·(COONa)2 is soluble in water with a low Krafft temperature (36.1 °C). The emulsions are sensitive to pH variations, and efficient demulsification can be achieved by a pH trigger. The carboxylic sodium group in the C10-Se-C10·(COONa)2 structure can be reversibly cycled between its anionic and nonionic states (carboxylic acid), resulting in a pH-controlled electrostatic attraction between the surfactant and alumina. The Pickering emulsion can be reversibly switched between “”on”” (stable) and “”off”” (unstable) states by pH at least four times. Compared with the emulsions stabilized by specially synthesized stimuli-responsive particles or surfactants, the method reported here is much easier to implement and requires very low concentrations of the surfactant and nanoparticles, with potential applications in the fields of biomedicine, drug delivery, and cosmetics.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 11-Bromoundecanoic acid, is researched, Molecular C11H21BrO2, CAS is 2834-05-1, about Discovery of SHP2-D26 as a First, Potent, and Effective PROTAC Degrader of SHP2 Protein, the main research direction is esophageal cancer AML SHP2 PROTAC degrader ERK inhibition phosphorylation.Safety of 11-Bromoundecanoic acid.

Src homol. 2 domain-containing phosphatase 2 (SHP2) is an attractive therapeutic target for human cancers and other human diseases. Herein, we report our discovery of potent small-mol. SHP2 degraders whose design is based upon the proteolysis-targeting chimera (PROTAC) concept. This work has led to the discovery of potent and effective SHP2 degraders, exemplified by SHP2-D26. SHP2-D26(I) achieves DC50 values of 6.0 and 2.6 nM in esophageal cancer KYSE520 and acute myeloid leukemia MV4;11 cells, resp., and is capable of reducing SHP2 protein levels by >95% in cancer cells. SHP2-D26 is >30-times more potent in inhibition of phosphorylation of extracellular signal-regulated kinase (ERK) and of cell growth than SHP099, a potent SHP2 inhibitor, in KYSE520 and MV4;11 cancer cell lines. This study demonstrates that induced SHP2 degradation is a very effective approach to inhibit the function of SHP2. Further optimization of these SHP2 degraders may lead to the development of a new class of therapies for cancers and other human diseases.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Name: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, is researched, Molecular C5H8O3, CAS is 32780-06-6, about Two approaches to the enantioselective synthesis of (4R)-(-)-4-hydroxymethyl-4-thiobutyro-1,4-lactone. Author is Zunszain, Patricia A.; Varela, Oscar.

Enantiomerically pure (4R)-4-hydroxymethyl-4-thiobutyro-1,4-lactone [(5R)-dihydro-5-(hydroxymethyl)-2(3H)-thiophenone (I)] and derivatives were synthesized by two enantiospecific sequences employing D-ribono-1,4-lactone (II) and L-glutamic acid (III) as chiral templates. The key step in the first approach was the SmI2-promoted 2,3-deoxygenation of a 4-thio-L-lyxono-1,4-lactone derivative, prepared from II. The other strategy, which starts from III, involves the (5S)-dihydro-5-(p-tolylsulfonyloxymethyl)-2-(3H)-furanone (IV) as chiral precursor. This was converted into a 4,5-thiirane derivative via the corresponding 4,5-epoxide. Regioselective opening of the thiirane ring by acetate followed by O-deacetylation gave I (40% overall yield from IV).

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 494-52-0, is researched, SMILESS is C1(C=NC=CC=1)[C@@H]1CCCCN1, Molecular C10H14N2Journal, Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov’t, Drug and Alcohol Dependence called Route of administration effects on nicotine discrimination in female and male mice, Author is Lefever, Timothy W.; Thomas, Brian F.; Kovach, Alexander L.; Snyder, Rodney W.; Wiley, Jenny L., the main research direction is Nicotine route of administration behavior; Discrimination; Nicotine; Route of administration; Sex differences.Synthetic Route of C10H14N2.

To provide preclin. models of vaping that incorporate olfactory cues and chemosensory effects (including flavors) that play a role in human vaping behavior, the feasibility of using a modified e-cigarette device for delivery of aerosolized nicotine was examined in a nicotine discrimination procedure in mice. After determination of a s.c. nicotine dose-effect curve, aerosolized freebase nicotine and nicotine-containing tobacco products (i.e., non-flavored and Arctic Blast e-liquids) were evaluated. Nicotine dose-dependently substituted in mice of both sexes, although females showed less sensitivity and greater variability. By contrast, aerosolized nicotine, regardless of formulation, produced concentration-dependent increases up to maximum of 46-62% nicotine-associated responding. Brain nicotine concentrations for each sex were similar for s.c. 0.75 mg/kg nicotine and 30 mg/mL freebase nicotine. Mice of both sexes readily acquired s.c. nicotine discrimination, but females showed less sensitivity. Further, all three formulations of aerosolized nicotine produced increases in nicotine-like responding in mice of each sex. However, the maximum magnitude of these increases did not engender a similar degree of substitution as s.c. 0.75 mg/kg nicotine, despite similar brain concentrations of nicotine at 30 mg/mL aerosolized nicotine. Addnl. research is needed for determination of the reason(s); however, results here demonstrate initial feasibility for examination of the discriminative stimulus effects of vaped drugs such as nicotine.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about New starburst metallodendrimers based on octa(diphenylphosphino)-functionalized silsesquioxane cores.Reference of 4-(p-Tolyl)-2,2:6,2-terpyridine.

Surface-modified starburst dendrimers were prepared by reaction of terpyridine-functionalized polyether monodendrons with an oligomeric polyhedral silsesquioxane (POSS) core. Subsequent reaction of these starburst dendrimers with ruthenium (II)-based precursors affords starburst metallodendrimers. These new dendrimers were characterized using a combination of mass spectral (MALDI-TOF, ESI, and FAB/MS) and NMR (1H, 13C, and 31P{1H}) analyses. Other characterization methods include photophys. (absorption, emission, excited-state lifetime, and quantum yield) and electrochem. (cyclic and square wave voltammetric) analyses. Photophys. data indicate that there is no intramol. excited-state quenching even in the generation 3 metallodendrimer, which possesses 32 ruthenium (II) centers. Electrochem. studies reveal the presence of charge trapping effects, as well as ligand-centered and metal-centered redox couples.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Computed Properties of C10H14N2. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: (S)-3-(Piperidin-2-yl)pyridine, is researched, Molecular C10H14N2, CAS is 494-52-0, about Gas chromatography-mass spectrometry method for simultaneous detection of nine alkaloids in tobacco and tobacco products by QuEChERS sample preparation. Author is Li, Xintong; Liu, Fang; Wang, Huifang; He, Fan; Yang, Rui; Zhao, Mingqin.

One method based on QuEChERS sample preparation is presented in this study, which leads to simultaneously detect nine alkaloids in tobacco and tobacco products. Nicotine, nomicotine, myosmine, N-Me anabasine, β-nicotyrine, anabasine, anatabine, isonicotenine and cotinine can all be found in fresh tobacco leaves, cigars, Virginia-type and blended-type cigarettes. The samples were purified via a certain proportion of adsorbents consisting of anhydrous magnesium sulfate, PSA and carbon after extracting, then centrifuged and filtered before analyzing by GC-MS. The matrix effects were all among 88 – 105%. The limit of detection of all were within the range of 0.0065 – 0.1509 μg/g and limit of quantification were among 0.0217 – 0.5031 μg/g. The recovery rates were higher than 89%. This is the first time that the QuEChERS sample preparation method has been applied for tobacco alkaloids, where more varieties of alkaloids could be quantified regarding sensitivity and reproducibility.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI