Day: April 1, 2022

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 67914-60-7, is researched, Molecular C12H16N2O2, about Synthesis of preladenant, the main research direction is preladenant condensation ultrasound.SDS of cas: 67914-60-7.

An intermediate, 1-(4′-methoxyethoxyl phenyl) piperazine (III), was synthesized from 1-(4′-hydroxylphenyl)-piperazinyl ethanone (I) via etherification and hydrolysis. Another intermediate (VII) with a nitrogen condensed ring was prepared from Me furan-2-carboxylate (IV) by acylation, ring-closure and halogenation. Finally, Preladenant was prepared from the two intermediates by condensation reaction. FTIR, 1HNMR and ESI-MS were employed to characterize these intermediates and the target compound Through common synthetic method, the yields of these 6 steps are 99.0%, 95.4%, 98.0%, 78.9%, 86.9% (calculated by Cl) and 52.5%, resp. To obtain a higher total yield, ultrasonic was used in the last condensation reaction. The results show that the condensation yield reached 85.4% when the reaction conditions were as follows: the ultrasonic power (150 W), the molar ratio of intermediate III to VII (1.2: 1), solvent (DMSO), acid-bonding agent (Na2CO3), reaction temperature (90°C) and reaction time (1.5 h). The yield of the condensation is greatly increased by ultrasonic method.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

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: 6-Hydroxy-2-methylpyrimidin-4(3H)-one, is researched, Molecular C5H6N2O2, CAS is 1194-22-5, about Kinetic and spectral investigation of the electron and hydrogen adducts of dihydroxy- and dimethyl-substituted pyrimidines: A pulse radiolysis and product analysis study.COA of Formula: C5H6N2O2.

The reactions of hydrated electrons (eaq-) and hydrogen atoms (H•) with 4,6-dihydroxy-2-methylpyrimidine (DHMP), 2,4-dimethyl-6-hydroxypyrimidine (DMHP), 5,6-dimethyluracil (DMU) and 6-methyluracil (MU) were studied at different pH values using pulse radiolysis. The second-order rate constants obtained for the reaction of eaq- with these systems are in the range (5-10) × 109 dm3 mol-1 s-1 at near, neutral pH. At basic pH, the rate constant values were considerably reduced owing to the electrostatic effect between eaq- and pyrimidine anion. The transient absorption spectra of the electron adducts have distinct absorption maxima at around 300-320 nm. The initial spectrum in the case of DHMP at pH 4.5 was found to undergo a first-order transformation. Based on the spectral characteristics and the yields of methylviologen radical cation (MV.+) resulted from the electron transfer reaction between the electron adducts and MV2+, it is proposed that a protonated (at oxygen) electron adduct of DHMP is initially formed which undergoes a proton- and phosphate-catalyzed transformation to form a reducing C(5) protonated C(6)-yl radical. Such preferential protonation at C(5) is predominant only with dihydroxypyrimidine systems. At pH 9 and 13, formation of a radical monoanion of DHMP (pKa ≥ 13) is proposed. The possible attack of eaq- is proposed to be at N(1) or N(3) of DMHP. The resulting electron adduct has a pKa value around 6.0. Similar properties for the electron adducts of DMU and MU [electron attack at O(4)] are proposed. The second-order rate constants for H. with DHMP, DMHP, DMU and MU were in the range (1.7-28) × 108 dm3 mol-1 s-1. The hydrogen adduct spectra were generally identified as their absorption maxima at 310-380 and 460-510 nm. Formation of C(5)-protonated C(6)-yl radical, the same radical that formed after the H+-and phosphate-catalyzed transformation of the electron adduct, is proposed for DHMP. The possibility of the formation of C(5)-yl and C(6)-yl H adducts of DMHP, DMU and MU is discussed. High-performance liquid chromatog. coupled with electrospray mass spectrometry (HPLC-ES-MS) has been used to qual. analyze the products obtained from the reaction of eaq- with DHMP and DMHP and the results revealed that the products are mainly derived from the C(5) protonated C(6)-yl radicals via its disproportionation and dimerization reaction. A possible reaction mechanism is proposed for the product formation.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Cupric bromide( cas:7789-45-9 ) is researched.COA of Formula: Br2Cu.Fuqha, Muheeb; Awwadi, Firas F.; Haddad, Salim F.; Al-Zaqri, Nabil; Alharthi, Fahad A.; Suleiman, Mohammed; Zarrouk, Abdelkader; Boshaala, Ahmed M.; Warad, Ismail published the article 《Design, XRD/HSA-interactions, spectral, thermal, Solvatochromism and DNA-binding of two [Cu(phen)(triene)]Br2 complexes: Experimental and DFT/TD-DFT investigations》 about this compound( cas:7789-45-9 ) in Journal of Molecular Structure. Keywords: crystal structure copper phen diethelenetriamine complex; copper phen diethelenetriamine dipropylenetriamine preparation DFT DNA binding. Let’s learn more about this compound (cas:7789-45-9).

Two dicationic Cu(II) complexes of [Cu(phen)(NNN)]Br2 (1-2) general formula [phen = 1,10-phenanthroline, NNN = diethylenetriamine (dien) 1 and dipropylenetriamine (dipn) 2], were synthesized in very good yields. The two complexes were characterized via UV-visible, CHN-EA, MS, FTIR, thermal, and x-ray crystallog. techniques. XRD data for 1 showed a distorted square pyramidal Cu(II) ions geometry center with three uncoordinated H2O mols. TGA were performed to evaluate the interactions strength and found to support the XRD mol. interactions results. The time-dependent d. functional theory (TD-DFT) and electron transfer processes were modeled, and consequently the absorption maxima around 610 and 280 nm were attributed to d-d and Phen(π)→Phen(π*) transitions. Pos. Gutmann’s solvatochromism behavior of both complexes were recorded. Also, the ability of the two complexes for DNA binding was evaluated via absorption studies in the visible region showing high Kb constant values.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 5451-40-1, is researched, Molecular C5H2Cl2N4, about Development of a quinolinium/cobaloxime dual photocatalytic system for oxidative C-C cross-couplings via H2 release, the main research direction is quinoline photocatalyst oxidative cross coupling Minisci alkylation photocyclization.Synthetic Route of C5H2Cl2N4.

Designing mol. photocatalysts for potent photochem. reactivities ranks among the most challenging but rewarding endeavors in synthetic photochem. Herein, we document a quinoline-based organo-photoredox catalyst, 2,4-bis(4-methoxyphenyl)quinoline (DPQN2,4-di-OMe), that could be assembled via the facile aldehyde-alkyne-amine (A3) couplings. Unlike the reported photocatalysts, which impart their photoreactivities as covalently linked entities, our mechanistic studies suggested a distinct proton activation mode of DPQN2,4-di-OMe. Simply upon protonation, DPQN2,4-di-OMe could reach a highly oxidizing excited state under visible-light irradiation (E*1/2 = +1.96 V vs a standard calomel electrode, SCE). On this basis, the synergistic merger of DPQN2,4-di-OMe and cobaloxime formulated an oxidative cross-coupling platform, enabling the Minisci alkylation and various C-C bond-forming reactions with a diverse pool of radical precursors in the absence of chem. oxidants. The catalytic loading of DPQN2,4-di-OMe could be minimized to 0.025 mol % (TON = 3360), and a polymer-supported photocatalyst, DPQN2,4-di-OR@PS, was prepared to facilitate catalyst recycling (at a 0.50 mmol % loading and up to five times without significant loss of photosynthetic efficiency).

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

Product Details of 288-42-6. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Oxazole, is researched, Molecular C3H3NO, CAS is 288-42-6, about Biomaterials from the sea: Future building blocks for biomedical applications. Author is Wan, Mei-chen; Qin, Wen; Lei, Chen; Li, Qi-hong; Meng, Meng; Fang, Ming; Song, Wen; Chen, Ji-hua; Tay, Franklin; Niu, Li-na.

A review. Marine resources have tremendous potential for developing high-value biomaterials. The last decade has seen an increasing number of biomaterials that originate from marine organisms. This field is rapidly evolving. Marine biomaterials experience several periods of discovery and development ranging from coralline bone graft to polysaccharide-based biomaterials. The latter are represented by chitin and chitosan, marine-derived collagen, and composites of different organisms of marine origin. The diversity of marine natural products, their properties and applications are discussed thoroughly in the present review. These materials are easily available and possess excellent biocompatibility, biodegradability and potent bioactive characteristics. Important applications of marine biomaterials include medical applications, antimicrobial agents, drug delivery agents, anticoagulants, rehabilitation of diseases such as cardiovascular diseases, bone diseases and diabetes, as well as comestible, cosmetic and industrial applications.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

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: 1-(4-(4-Hydroxyphenyl)piperazin-1-yl)ethanone, is researched, Molecular C12H16N2O2, CAS is 67914-60-7, about Nickel-Catalyzed Deoxygenative Deuteration of Aryl Sulfamates.Name: 1-(4-(4-Hydroxyphenyl)piperazin-1-yl)ethanone.

The nickel-catalyzed deoxygenative deuteration of aryl/heteroaryl sulfamates was developed, and the effective incorporation of deuterium into a variety of aromatic compounds was achieved with sufficient catalytic efficiency and high deuteration degree. This process tolerated reducible functional moieties and heterocyclic structures. Addnl., a double introduction of deuterium also successfully gave a desired product with a high yield and deuterium content.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

Quality Control of Oxazole. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Oxazole, is researched, Molecular C3H3NO, CAS is 288-42-6, about Relating nucleus independent chemical shifts with integrated current density strengths. Author is Radenkovic, Slavko; Djordjevic, Sladjana.

Indexes based on the nucleus independent chem. shift (NICS) are the most frequently used in anal. of magnetic aromaticity. The magnetically induced c.d., on the other hand, is a key concept in defining magnetic aromaticity. The integrated current strength (current strength susceptibility) was found to be a very useful tool in aromaticity studies. There is widely accepted notion that the properly chosen NICS-based index can provide information on the c.d. strength and direction in a mol. of interest. In this work, a detailed numerical testing of the relationship between the integrated bond current strength and the most employed NICS indexes was performed for a set of 43 monocyclic aromatic mols. Based on the statistical data anal., the relationship between the bond current strength and its π and σ electron components, on one side, and the isotropic NICS (NICSiso and NICSπ,iso) and zz-component of the NICS tensor (NICSzz and NICSπ,zz), on the other side, was examined It was found that between the NICSπ,zz(1) and π-electron bond current strengths there is very good linear correlation. Quite surprisingly, it was revealed that the NICSiso(1) and NICSzz(1) are not correlated with the π electron bond current strengths. On the other hand, a reasonably good linear correlation was found between the NICSzz(1) and total bond current strengths.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

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: 7789-45-9, is researched, SMILESS is [Cu+2].[Br-].[Br-], Molecular Br2CuJournal, Reaction Kinetics, Mechanisms and Catalysis called Multicriteria optimization of the catalytic reaction for the synthesis of benzyl butyl ether based on the kinetic model, Author is Koledina, K. F.; Gubaydullin, I. M.; Koledin, S. N., the main research direction is benzyl butyl ethe multicriteria optimization catalysis r kinetics.Quality Control of Cupric bromide.

The work investigates the catalytic reaction of the benzyl Bu ether catalytic synthesis reaction by methods of math. modeling, based on exptl. data. Schematic technol. diagram of benzyl Bu ether production by intermol. dehydration of benzyl alc. with Bu alc. in the presence of a CuBr2 catalyst is given. A kinetic model of the process was developed according to a detailed scheme of chem. transformations. Intermol. dehydration of benzyl alc. and Bu alc. proceeds in three directions and leads to the formation of benzyl Bu, dibenzyl and di-Bu ethers. The problem of multicriteria optimization is formulated based on the kinetic model. Variable parameters are temperature, molar ratio of starting reagents and reaction time. Optimality criteria are maximizing the yield of the target benzyl Bu ether and minimizing the yield of byproducts. The solution of the multicriteria optimization problem was carried out by the NSGA-II Pareto-approximation algorithm. The results showed that an increase in the content of dibenzyl ether allows an increase in the yield of the target benzyl Bu ether. When the maximum permissible values of the molar ratio of the reactants, by-dibutyl ether increases yield while increasing the target output benzyl Bu.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

Application of 5451-40-1. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2,6-Dichloropurine, is researched, Molecular C5H2Cl2N4, CAS is 5451-40-1, about Purine Unit as a Building Block of Artificial Receptors Designed for the Recognition of Carbohydrates. Author is Kaiser, Stefan; Geffert, Christoph; Mazik, Monika.

1,3,5-Substituted 2,4,6-triethylbenzene derivatives bearing pyridine/pyrimidine and purine units were synthesized and their potential to function as carbohydrate receptors was evaluated. Compounds consisting of 2-chloro-9H(7H)-purin-6-yl unit (e.g., I) have the ability to act both as carbohydrate-binding agents and as a basis for further functionalization through the nucleophilic displacement of the chlorine atom. Microwave-assisted reactions and/or the application of sealed tubes allowed the preparation of derivatives with a varying substituent pattern on the purine ring. The relatively drastic reaction conditions required for the successful functionalization reflect the unfavorable influence of the bulky C6-substituent on the nucleophilic substitution at purine C2. Initial binding studies towards carbohydrates showed that the properties of this type of purine-bearing compounds can be fine-tuned by the variation of the C2-substituent of the purine ring and represents a valuable basis for the identification of new structure-activity relationships. Such findings are of high importance for further developments in the area of mol. recognition of carbohydrates by artificial receptors.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem

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: 70-23-5, is researched, SMILESS is O=C(OCC)C(CBr)=O, Molecular C5H7BrO3Journal, Article, Combinatorial Chemistry & High Throughput Screening called Green synthesis of 4H-pyran derivatives using Fe3O4-MNPs as efficient nanocatalyst: study of antioxidant activity, Author is Shafaei, Faezeh; Najar, Asef H., the main research direction is iron oxide magnetic nanoparticle preparation; dialkyl oxo dihydroindenopyran dicarboxylate green preparation antioxidant; ninhydrin haloketone dialkyl acetylenedicarboxylate triphenylphosphine multicomponent iron oxide nanocatalyst; Diels-Alder reactions; Fe3O4-MNPs; Ninhydrine; Pyran; green synthesis; α-haloketones.Recommanded Product: Ethyl 3-bromo-2-oxopropanoate.

A series of dialkyl 4-(oxo-alkoxy/aryl)-5-oxo-4,5-dihydroindeno[1,2-b]pyran-2,3-dicarboxylates I [R = CO2Et, 4-MeC6H4, 4-BrC6H4, etc.; R1 = Me, Et] was synthesized via a multicomponent reaction of ninhydrin, α-haloketones, dialkyl acetylenedicarboxylates and triphenylphosphine in the presence of iron oxide magnetic nanoparticles (Fe3O4-MNPs) as efficient nanocatalyst in ethanol at room temperature The biosynthesis of Fe3O4-MNPs was achieved using Clover Leaf water extract In addition, antioxidant activity was examined for some of the compounds I [R = CO2Et, 4-MeC6H4, 4-MeOC6H4, 4-O2NC6H4; R1 = Me, Et] employing DPPH radical scavenging and ferric reduction activity potential (FRAP) experiment and compared results with synthetic antioxidants (TBHQ and BHT). Compound I [R = CO2Et; R1 = Et] showed excellent radical trapping activity and good reducing activity relative to standards (BHT and TBHQ). Some advantages of this procedure were easiness of reaction workup and seperation of products by simply filtration. Fe3O4-MNPs displayed a good improvement in the yield of the product and showed significant reusable activity.

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Reference:
Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem