Category: isoquinoline

Jeon, Dong Bok published the artcileDetermination of volatile organic compounds, catechins, caffeine and theanine in Jukro tea at three growth stages by chromatographic and spectrometric methods, Computed Properties of 21834-92-4, the main research area is catechin caffeine theanine Junko tea growth; High performance liquid chromatography (HPLC); Jukro tea; Simultaneous distillation solvent-extraction gas chromatography-mass spectrometry (SDE-GC/MS); Theanine; Volatile organic compounds.

Tea contains characteristic volatile organic compounds, polyphenols, caffeine and catechins, and is therefore among the most widely consumed beverages all over the world. In this study, fresh Jukro tea leaves collected from Damyang-gun (Jeollanam-do) at 40, 60 and 90 day growth stages, were semi-fermented. The volatile organic compounds (VOCs) were extracted by simultaneous distillation-solvent extraction (SDE) and analyzed by gas chromatog./mass spectrometry (GC/MS). Catechins, caffeine and theanine were analyzed by high performance liquid chromatog. (HPLC). A total of 159 VOCs were identified in the analyzed Jukro tea leaves. Comparatively, the increase in the concentrations of VOCs was high in 60 day leaves. The content of catechins increased along the three growth stages, whereas caffeine, compared to 90 day leaves, was higher for 40 and 60 day leaves. Based on the results, the 60 day leaves were found to be the most suitable and useful for making semi-fermented Jukro tea.

Food Chemistry published new progress about Growth and development, plant. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Computed Properties of 21834-92-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Maeta, Naoya published the artcileProbing Intramolecular Electron Transfer in Redox Tag Processes, Related Products of isoquinoline, the main research area is intramol electron transfer photocatalytic cycloaddition double bond metathesis.

Herein, we show that redox tag-guided intermol. formal [2 + 2] cycloaddition can be used as a probe to investigate intramol. single-electron transfer (SET) mechanisms. The efficacy of intramol. SET can be evaluated in association with concomitant carbon-carbon bond formation and/or cleavage, leading to cycloaddition or cross-metathesis. Exptl. and theor. results suggest that the intramol. SET is under both thermodn. and kinetic control and can also occur through bonds, not only through space.

Organic Letters published new progress about [2+2] Cycloaddition reaction. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Ivanov, Konstantin L. published the artcileOne-Pot Synthesis of γ-Azidobutyronitriles and Their Intramolecular Cycloadditions, Name: 2,3-Dimethoxybenzaldehyde, the main research area is aldehyde cyanoacetate one pot cycloaddition reaction; azidocyanoester preparation; tetrazole preparation.

Efficient gram-scale, one-pot approached to azidocyanobutyrates and their amidated or decarboxylated derivatives was developed, starting from com. available aldehydes and cyanoacetates. These techniques combine (1) Knoevenagel condensation, (2) Corey-Chaykovsky cyclopropanation and (3) nucleophilic ring opening of donor-acceptor cyclopropanes with the azide ion, as well as (4) Krapcho decarboxylation or (4′) amidation. The synthetic utility of the resulting γ-azidonitriles was demonstrated by their transformation into tetrazoles via intramol. (3+2)-cycloaddition A condition-dependent activation effect of the α-substituent was revealed in that case. Thermally activated azide-nitrile interaction did not differentiate the presence of an α-electron-withdrawing substituent in γ-azidonitriles, whereas the Lewis acid mediated (SnCl4or TiCl4) reaction proceeded much easier for azidocyanobutyrates. This allowed us to develop an efficient procedure for converting azidocyanobutyrates into the corresponding tetrazoles.

Synthesis published new progress about [3+2] Cycloaddition reaction. 86-51-1 belongs to class isoquinoline, name is 2,3-Dimethoxybenzaldehyde, and the molecular formula is C9H10O3, Name: 2,3-Dimethoxybenzaldehyde.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Hong, Seung Youn published the artcileStereodefined Access to Lactams via Olefin Difunctionalization: Iridium Nitrenoids as a Motif of LUMO-Controlled Dipoles, Product Details of C9H10O3, the main research area is lactam stereodefined synthesis olefin difunctionalization iridium nitrenoid dipole.

Reported herein is a general platform of a stereodefined access to γ-lactams via Cp*Ir-catalyzed olefin difunctionalization, where in situ generated Ir-nitrenoid is utilized as a key motif of 1,3-dipoles to enable amido transfer in a syn-selective manner. Computational studies suggested that the stereodefined process can be attributed to the proposed working mode of concerted [3+2] cyclization. Frontier MO (FMO) anal. implied that a low-lying LUMO (LUMO) of the Ir-imido fragment engages in the olefin interaction. Mechanistic understanding on the nitrene transfer process led us to develop mild catalytic protocols of stereoselective difunctionalization of alkenyl dioxazolones to furnish α-(haloalkyl)- or (oxyalkyl)lactam products which are of high synthetic and medicinal utility. Product stereochem. (threo and erythro) was found to be designated by the olefin geometry (E/Z) of substrates.

Journal of the American Chemical Society published new progress about [3+2] Cycloaddition reaction. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Product Details of C9H10O3.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Richter, Matthieu J. R. published the artcileModular Synthesis of Cyclopropane-Fused N-Heterocycles Enabled by Underexplored Diazo Reagents, COA of Formula: C9H10O3, the main research area is unsaturated amine diazo acylating agent cycloaddition; cyclopropane fused lactam diastereoselective preparation; Cycloadditions; Cyclopropanation; Diazo Compounds; N-Heterocycles; Synthetic Methods.

General approach for the direct and modular synthesis of cyclopropane-fused lactams from unsaturated amines was reported. The operationally simple transformation, which proceeded through successive acylation, (3+2) cycloaddition and fragmentation, tolerates a broad range of functional groups and yields a wide spectrum of complex mol. scaffolds, including fused, bridged and spiro ring systems.

Angewandte Chemie, International Edition published new progress about [3+2] Cycloaddition reaction. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, COA of Formula: C9H10O3.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Radhoff, Niklas published the artcileOxindole synthesis via polar-radical crossover of ketene-derived amide enolates in a formal [3 + 2] cycloaddition, Related Products of isoquinoline, the main research area is aryl amide cycloaddition; oxindole preparation.

Simple, efficient and transition-metal free method for the preparation of valuable and sterically hindered 3,3-disubstituted oxindoles via polar-radical crossover of ketene derived amide enolates. Various easily accessible N-alkyl and N-arylanilines are added to disubstituted ketenes and the resulting amide enolates undergo upon single electron transfer oxidation a homolytic aromatic substitution (HAS) to provided 3,3-disubstituted oxindoles in good to excellent yields. A variety of substituted anilines and a 3-amino pyridine engage in this oxidative formal [3 + 2] cycloaddition and cyclic ketenes provided spirooxindoles. Both substrates and reagents were readily available and tolerance to functional groups was broad.

Chemical Science published new progress about [3+2] Cycloaddition reaction. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Choi, Subin published the artcileElectrosynthesis of Dihydropyrano[4,3-b]indoles Based on a Double Oxidative [3+3] Cycloaddition, Product Details of C8H11NO, the main research area is pyranoindole electrosynthesis oxidative coupling indole enamine tandem electrocyclization; [3+3] cycloaddition; electrochemistry; hydrogen atom transfer; indoles; radical chemistry.

Oxidative [3+3] cycloadditions offer an efficient route for six-membered-ring formation. This approach has been realized based on an electrochem. oxidative coupling of indoles/enamines with active methylene compounds followed by tandem 6π-electrocyclization leading to the synthesis of dihydropyrano[4,3-b]indoles and 2,3-dihydrofurans. The radical-radical cross-coupling of the radical species generated by anodic oxidation combined with the cathodic generation of the base from O2 allows for mild reaction conditions for the synthesis of structurally complex heterocycles.

Angewandte Chemie, International Edition published new progress about [3+3] Cycloaddition reaction. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Product Details of C8H11NO.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Echeverria, S. published the artcilePressurized liquid extraction and liquid chromatography-tandem mass spectrometry applied to determine iodinated x-ray contrast media in sewage sludge, Recommanded Product: Diatrizoic Acid, the main research area is pressurized liquid extraction chromatog tandem mass spectrometry; iodinated Xray contrast media determination sewage sludge; Iodinated X-ray contrast media; Liquid chromatography–tandem mass spectrometry; Pressurized liquid extraction; Sewage sludge.

Pressurized liquid extraction (PLE) was applied for the 1st time to the extraction of 5 iodinated x-ray contrast media from sludge. Once optimized all PLE parameters, the extract was analyzed by liquid chromatog.-tandem mass spectrometry, being the method developed sensible enough to reach limit of quantifications (LOQs) of 25 μg/Kg (d.w.). The method was applied to the anal. of sludge from urban sewage treatment plants and although some compounds such as iopromide, diatrizoic acid and iopamidol were identified, their concentrations were lower than their LOQs.

Analytica Chimica Acta published new progress about Extraction (pressurized liquid). 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Recommanded Product: Diatrizoic Acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Hidayani, W. A. published the artcileDetermination of the effect of EDTA and PCMB on purified bromelain activity from pineapple core and in vitro antiplatelet activity, Computed Properties of 104-01-8, the main research area is bromelain antiplatelet activity pineapple core enzyme.

Bromelain is an enzyme belongs to the cysteine protease. In this study, bromelain isolated from pineapple core (Ananascomosus [L.] Merr) was purified by fractionation using ammonium sulfate followed by dialysis and then ion exchange chromatog. The fraction of bromelain obtained from each purification step showed an increase in specific activity. The highest specific activity of protease was found in 20-50% ammonium sulfate fraction of 104.018 U/mg with a purity level 3.2-fold compared to crude extract Further purification by ion exchange chromatog. using DEAE-Cellulose, the fraction of bromelain showed an increase in specific activity to 278.333 U/mg with a purity level 8.8-fold compared to crude extract The determination of kinetics parameter of purified bromelain using Lineweaver-Burk plot gives Km value of 0.15% (w/v) and Vmax of 0.056 U/min. This bromelain can be strongly inhibited by EDTA and PCMB. The addition of EDTA and PCMB at a concentration of 0.5 mM can decrease the activity of the enzyme up to 88.50% by showing the competitive and mix-inhibition types of inhibition, resp. The antiplatelet activity of the bromelain fraction was tested in-vitro based on the Born method, by using plasma (PRP), acetosal as a pos. control and ADP as an aggregator. The purified bromelain showed the ability of an antiplatelet agent with percentage of aggregation 29.51% and percentage of inhibition 68.91%.

IOP Conference Series: Materials Science and Engineering published new progress about Platelet aggregation inhibitors. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Computed Properties of 104-01-8.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Feng, Xiu E. published the artcileProcess development and synthesis of process-related impurities of an efficient scale-up preparation of 5,2′-dibromo-2,4′,5′-trihydroxy diphenylmethanone as a new acute pyelonephritis candidate drug, Product Details of C9H10O3, the main research area is acute pyelonephritis drug synthesis LM49API; 5,2′-dibromo-2,4′,5′-trihydroxydiphenylmethanone; acute pyelonephritis; polymorph; process development; process-related impurity.

Based on a foregoing gram-scale laboratory process, an efficient scale-up preparation process of 5,2′-dibromo-2,4′,5′-trihydroxydiphenylmethanone (LM49-API), a new acute pyelonephritis candidate drug, was developed and validated aiming to reduce byproducts and achieve better impurity profiles. Meanwhile, the polymorph of LM49-API and process-related impurities were also investigated. Ultimately, the optimal reaction conditions were verified by evaluating the impurity profiles and their formation during the synthesis. Six process-related impurities were synthesized and identified, being useful for the quality control of LM49-API. Its finalized preparation process was further validated at 329-410 g scale-up production in 53.4-57.1% overall yield with 99.95-99.98% high-performance liquid chromatog. (HPLC) purity, and it is currently viable for com. production LM49-API-imC and LM49-API-imX were identified as the main single impurities in LM49-API, with the content controlled to be less than 0.03%.

Molecules published new progress about Temperature effects, biological. 86-51-1 belongs to class isoquinoline, name is 2,3-Dimethoxybenzaldehyde, and the molecular formula is C9H10O3, Product Details of C9H10O3.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem