Month: April 2022

The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Validation of an automated liquid chromatographic method for omeprazole in human plasma using on-line solid-phase extraction.》. Authors are García-Encina, G; Farrán, R; Puig, S; Martínez, L.The article about the compound:5-Methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]thio]benzimidazolecas:73590-85-9,SMILESS:CC1=CN=C(CSC2=NC3=CC(OC)=CC=C3N2)C(C)=C1OC).Category: ethers-buliding-blocks. Through the article, more information about this compound (cas:73590-85-9) is conveyed.

An automated system using on-line solid-phase extraction and HPLC with UV detection has been validated in order to determine omeprazole in human plasma. The extraction was carried out using C18 cartridges. After washing, omeprazole was eluted from the cartridge with mobile phase onto an Inertsil ODS-2 column. The developed method was selective and linear for drug concentrations ranging between 5 and 500 ng ml(-1). The recovery of omeprazole ranged from 88.1 to 101.5%, and the limit of quantitation (LOQ) was 5 ng ml(-1). The intraday accuracy ranged from 93.1 to 106.2% and the interday accuracy varied from 95.4 to 105.1%. For the LOQ, good values of precision (8.7 and 17.5% for intraday and interday, respectively) were also obtained. This automated system has been applied to determine omeprazole in human plasma samples from bioequivalence studies.

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Name: 4-(Piperazin-1-yl)phenol. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 4-(Piperazin-1-yl)phenol, is researched, Molecular C10H14N2O, CAS is 56621-48-8, about Structure-Function Analysis of Phenylpiperazine Derivatives as Intestinal Permeation Enhancers. Author is Fein, Katherine C.; Lamson, Nicholas G.; Whitehead, Kathryn A..

Purpose: A major obstacle preventing oral administration of macromol. therapeutics is poor absorption across the intestinal epithelium into the bloodstream. One strategy to improve transport across this barrier is the use of chem. permeation enhancers. Several mol. families with permeation enhancing potential have been identified previously, including piperazines. In particular, 1-phenylpiperazine has been shown to enhance transepithelial transport with minimal cytotoxicity compared to similarly effective mols. To better understand how the chem. of 1-phenylpiperazine affects its utility as an intestinal permeation enhancer, this study examined a small library of 13 derivatives of 1-phenylpiperazine. Methods: The efficacy and cytotoxicity of 13 phenylpiperazine compounds were assessed in a Caco-2 model of the intestinal epithelium. Efficacy was measured using the paracellular diffusion marker calcein as well as by immunostaining and confocal imaging of Caco-2 monolayers. Results: Of the 13 derivatives, two enhanced the permeability of the fluorescent marker calcein over 100-fold. It was found that hydroxyl or primary amine substitutions on the Ph ring significantly increased toxicity, while aliphatic substitutions resulted in efficacy and toxicity profiles comparable to 1-phenylpiperazine. Conclusions: Several potent derivatives, including 1-methyl-4-phenylpiperazine and 1-(4-methylphenyl)piperazine, displayed lower toxicity than 1-phenylpiperazine, suggesting promise in future applications.

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Lindberg, Per; Nordberg, Peter; Alminger, Tomas; Braendstroem, Arne; Wallmark, Bjoern published an article about the compound: 5-Methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]thio]benzimidazole( cas:73590-85-9,SMILESS:CC1=CN=C(CSC2=NC3=CC(OC)=CC=C3N2)C(C)=C1OC ).Recommanded Product: 5-Methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]thio]benzimidazole. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:73590-85-9) through the article.

The very potent gastric antisecretory agent omeprazole (I) [73590-58-6], presently under clin. evaluation, has been shown to act via inhibition of the gastric H+, K+-ATPase, the enzyme responsible for pumping of protons into the stomach. I needs acid activation to become an active inhibitor. A tetracyclic sulfenamide (II) was isolated from the acid decomposition of I. This sulfenamide, or, alternatively, the corresponding sulfenic acid, an unstable, probable intermediate in the sulfenamide formation, is the active inhibitor formed in vivo from omeprazole.

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Ether – Wikipedia,
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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: 5-Methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridyl)methyl]thio]benzimidazole, is researched, Molecular C17H19N3O2S, CAS is 73590-85-9, about Effect of hypoxia on oxidative and reductive pathways of omeprazole metabolism by the isolated perfused rat liver.Recommanded Product: 73590-85-9.

The effect of hypoxia on the elimination of H168-68 (omeprazole)(I) [73590-58-6] a potent inhibitor of gastric acid secretion, was studied in the isolated perfused rat liver. During normal oxygenation, a 10 mg bolus dose was eliminated rapidly (half-life (T1/2)-β = 8.0 min), while under hypoxic conditions T1/2β was increased to 81.6 min. Upon reoxygenation, T1/2β returned to 9.6 min. During hypoxia, perfusate concentrations of an oxidative metabolite (I-sulfone [88546-55-8]) were reduced by 68%, while those of the reductively-generated I-sulfide [73590-85-9] increased 4-fold. With reoxygenation, both formation and elimination of the sulfone were increased, whereas, which had accumulated during the hypoxic period, was eliminated rapidly. These findings were duplicated in steady-state experiments, in which omeprazole clearance during hypoxia fell by at least 70%, and sulfide concentrations in perfusate rose from undetectable levels to 200 ng/mL (at least a 10-fold increase). Sulfone concentrations did not change with hypoxia, consistent with a reduction in both its formation and elimination rates. Thus, the hepatic elimination of omeprazole is severely retarded by hypoxia, but this effect is promptly reversed by reoxygenation. The increased formation of the reductive metabolite during hypoxia is not of sufficient magnitude to sustain the normal hepatic elimination of omeprazole.

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Ether – Wikipedia,
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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 4-(Piperazin-1-yl)phenol( cas:56621-48-8 ) is researched.Name: 4-(Piperazin-1-yl)phenol.Andonova, Lily; Zheleva-Dimitrova, Dimitrina; Georgieva, Maya; Zlatkov, Alexander published the article 《Synthesis and antioxidant activity of some 1-aryl/aralkyl piperazine derivatives with xanthine moiety at N4》 about this compound( cas:56621-48-8 ) in Biotechnology & Biotechnological Equipment. Keywords: piperazine aryl aralkyl xanthine preparation antioxidant; 1-aryl/aralkyl piperazines; antioxidant activity; xanthine. Let’s learn more about this compound (cas:56621-48-8).

Six new aryl/aralkyl substituted piperazine derivatives, containing methylxanthine moiety I (R = Bn, 4-FC6H4, 4-HOC6H4, etc.) were synthesized. All compounds were in vitro screened for their activity as antioxidants using DPPH (2,2′-Diphenyl-1-picrylhydrazyl), ABTS (2,2′-azinobis-(3-ethylbenzothiazine-6-sulfonic acid)) and FRAP (ferric reducing/antioxidant power) methods. The antioxidant activity of the studied compounds against lipid peroxidation was also measured. The highest antioxidant activity was demonstrated by compound I (R = 4-HOC6H4). It is obvious that the presence of a hydroxyl group in the structure is essential for the antioxidant properties and should be taken into consideration in further design of structures with potential antioxidant properties.

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Ether – Wikipedia,
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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: 56621-48-8, is researched, Molecular C10H14N2O, about Synthesis and bioevaluation of 4,5,6,7-tetrahydrobenzo[d]isoxazole derivatives as melanogenesis inhibitors, the main research direction is arylpiperazinyl tetrahydrobenzoisoxazolyl methanone preparation melanogenesis inhibitor SAR; tetrahydrobenzoisoxalyl carboxylic acid chloride preparation arylpiperazine amide coupling.Computed Properties of C10H14N2O.

A series of 4,5,6,7-tetrahydrobenzo[d]isoxazole derivatives I [R1 = H, tert-butyl; R2 = 4-OH, 4-OMe, 2-OMe, 4-CF3, 4-F] was prepared via amide coupling of arylpiperazines with corresponding 4,5,6,7-tetrahydrobenzo[d]isoxazole carboxylic acid chlorides. Addnl., 4,5,6,7-tetrahydrobenzo[d]isoxazole derivative I [R1 = H; R2 = 4-OEt] was synthesized by O-alkylation of compound I [R1 = H; R2 = 4-OH] using iodoethane. The synthesized compounds were tested for their melanogenesis inhibiting activity through potential down-regulation of tyrosinase expression. Among the tested compounds, compounds I [R1 = H; R2 = 4-OMe, 2-OMe, 4-CF3] displayed better melanogenesis inhibiting activity than well-known compounds Arbutin and Kojic acid, without intrinsic cytotoxicity.

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Ether – Wikipedia,
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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.Bhandare, Richie R.; Canney, Daniel J. researched the compound: 4-(Piperazin-1-yl)phenol( cas:56621-48-8 ).Computed Properties of C10H14N2O.They published the article 《Modifications to five-substituted 3,3-diethyl-4,5-dihydro-2(3H)-furanones en route to novel muscarinic receptor ligands》 about this compound( cas:56621-48-8 ) in Medicinal Chemistry Research. Keywords: ethyldihydrofuranone preparation; iodomethyllactone secondary amine amination hydroxymethyllactone piperidylbenzenisocyanate condensation; muscarinic receptor binding structure activity. We’ll tell you more about this compound (cas:56621-48-8).

Lead lactone-based ligands with modest affinity for muscarinic receptors were modified based on structure-activity relationship data in the literature to provide a new series of 5-substituted 4,5-dihydro-2(3H)-furanones. The modifications included the addition of various nitrogen-containing heterocycles attached to substituted and unsubstituted aromatic rings. The target compounds, e.g. I, were synthesized in modest yields and evaluated in preliminary muscarinic binding assays. A lactone-based ligand containing a diphenylmethylpiperazine moiety was identified as a nonselective muscarinic ligand with IC50 of 340 nM. The design of future ligands will be based, in part, on structure-activity data reported herein.

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Ether – Wikipedia,
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Related Products of 56621-48-8. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 4-(Piperazin-1-yl)phenol, is researched, Molecular C10H14N2O, CAS is 56621-48-8, about N-Substituted S-Alkyl Carbamothioates in the Synthesis of Nitrogen-containing Functional Derivatives of the Adamantane Series. Author is Klimochkin, Yu. N.; Ivleva, E. A..

A series of new asym. ureas, urethanes, and other derivatives of the framework structure I [R = OCH2C2OH, (2-methylquinolin-4-yl)aminyl, 4-methylpiperazin-1-yl.HCl, etc.] have been synthesized by the reactions of adamantan-1-yl isocyanate generated in situ by the thermolysis of S-Et (adamantan-1-yl)carbamothioate with nitrogen-containing nucleophiles and alcs.

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Ether – Wikipedia,
Ether | (C2H5)2O – PubChem

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 1-Methyl-3-(thiophen-2-yl)-1H-pyrazol-5-amine( cas:118430-78-7 ) is researched.Name: 1-Methyl-3-(thiophen-2-yl)-1H-pyrazol-5-amine.Norman, Rebecca E.; Perkins, Michael V.; Liepa, Andris J.; Francis, Craig L. published the article 《N,N-Dialkyl-N’-Chlorosulfonyl Chloroformamidines in Heterocyclic Synthesis. Part XII.* Synthesis and Reactivity of the Pyrazolo[3,4-e][1,2,4]thiadiazine Ring System》 about this compound( cas:118430-78-7 ) in Australian Journal of Chemistry. Keywords: pyrimidothiadiazine preparation; pyrazolothiadiazine preparation; dialkylchlorosulfonyl chloroformamidine aminopyrazole dinucleophilic substitution methylation alkylation. Let’s learn more about this compound (cas:118430-78-7).

N,N-Dialkyl-N’-chlorosulfonyl chloroformamidines 1 reacted regioselectively with 1-substituted 5-aminopyrazoles 2 via a 1,3-CCN dinucleophilic substitution to afford pyrazolo[3,4-e][1,2,4]thiadiazines 3 e. g., I, as the sole isolated products. Compounds 3, representatives of a very rare ring system, were shown to possess three nucleophilic sites at N2, N4, and N6. Methylation occurred at all three sites. Alkylation with benzylic halides occurred preferentially at N2, but some also occurred at N4, and at C7a. Alkylation with Et bromoacetate occurred at both N4 and N6, but the latter derivatives underwent a pyrazole ring expansion to afford pyrimido[4,5-e][1,2,4]thiadiazine derivs, e. g., II. Compounds 3 were unreactive towards various acylating agents.

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Ether – Wikipedia,
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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 4-(Piperazin-1-yl)phenol(SMILESS: OC1=CC=C(N2CCNCC2)C=C1,cas:56621-48-8) is researched.SDS of cas: 56621-48-8. The article 《Discovery of small molecules that inhibit melanogenesis via regulation of tyrosinase expression》 in relation to this compound, is published in Bioorganic & Medicinal Chemistry Letters. Let’s take a look at the latest research on this compound (cas:56621-48-8).

5,6,7,8-Tetrahydro-4H-cyclohepta[d]isoxazole derivatives were synthesized and evaluated as a novel class of inhibitors for α-MSH (α-MSH) induced melanogenesis in a mouse melanoma B16F10 cell line. Three of the compounds (IC50 = 0.67 μM), (IC50 = 1.01 μM) and (IC50 = 0.99 μM) exhibited a potent inhibitory activity approx. 85- to 126-fold greater than kojic acid, a well-known potent inhibitor. A biochem. study indicates that the activity of this series should be displayed via down-regulation of the expression of tyrosinase.

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Ether – Wikipedia,
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