Day: December 2, 2022

Boleda, M. Rosa published the artcileValidation and uncertainty estimation of a multiresidue method for pharmaceuticals in surface and treated waters by liquid chromatography-tandem mass spectrometry, SDS of cas: 117-96-4, the main research area is validation uncertainty estimation multiresidue pharmaceutical water; liquid chromatog tandem mass spectrometry.

The estimation of measurement uncertainty associated with quant. results is essential to assure the reliability of anal. methods and mandatory when a laboratory implements ISO standard 17025. A quant. multi-residue method based on solid-phase extraction (SPE) and ultra-performance liquid chromatog. tandem mass spectrometry detection (LC-MS/MS) was developed and validated for the anal. of 53 pharmaceuticals (analgesics, anti-inflammatories, antibiotics, lipid regulating agents, cholesterol lowering stating agents, gastric drugs, x-ray, and miscellaneous compounds such as sildenafil, prednisone, triclosan, chlorhexidine and miconazole) in surface and drinking waters. A full validation of the method, according to ISO standard 17025 procedure, was performed. Linearity (0.01-250 ng/L), intra-day precision (3-19% RSD in surface water and 2-19% RSD in drinking water) and inter-day precision (3-16% RSD in surface water and 1-18% RSD in drinking water), matrix effects (low matrix effects were observed for 50% of compounds in both matrixes), limits of quantification (0.2-40 ng/L in surface water and 0.2-30 ng/L in drinking water) were calculated The recoveries at 100 ng/L were >80% for 72 and 79% of the target compounds in surface and drinking waters, resp. The information obtained from the full method validation was used to estimate the expanded uncertainty and the uncertainties contributions of the different individual steps of the method for the determination of pharmaceuticals at trace levels in waters. Expanded relative uncertainties were 6-23% being the uncertainty associated with reproducibility the main contribution.

Journal of Chromatography A published new progress about Analgesics. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, SDS of cas: 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Casas, Monica Escola published the artcileBiodegradation of pharmaceuticals in hospital wastewater by staged Moving Bed Biofilm Reactors (MBBR), Application of Diatrizoic Acid, the main research area is hospital wastewater pharmaceutical MBBR biodegradation; Biodegradation; Conjugates; Degradation kinetics; Hospital wastewater; Pharmaceuticals; X-ray contrast media.

Hospital wastewater represents a significant input of pharmaceuticals into municipal wastewater. As Moving Bed Biofilm Reactors (MBBRs) appear to remove organic micro-pollutants, hospital wastewater was treated with a pilot plant consisting of three MBBRs in series. The removal of pharmaceuticals was studied in two experiments: (1) A batch experiment where pharmaceuticals were spiked to each reactor and (2) a continuous flow experiment at native concentrations DOC removal, nitrification as well as removal of pharmaceuticals (including X-ray contrast media, β-blockers, analgesics and antibiotics) occurred mainly in the first reactor. In the batch experiment most of the compounds followed a single first-order kinetics degradation function, giving degradation rate constants ranged from 5.77 × 10-3 to 4.07 h-1, from -5.53 × 10-3 to 9.24 × 10-1 h-1 and from 1.83 × 10-3 to 2.42 × 10-1 h-1 for first, second and third reactor resp. Generally, the highest removal rate constants were found in the first reactor while the lowest were found in the third one. This order was inverted for most compounds, when the removal rate constants were normalized to biomass, indicating that the last tank had the most effective biofilms. In the batch experiment, 21 out of 26 compounds were assessed to be degraded with more than 20% within the MBBR train. In the continuous flow experiment the measured removal rates were lower than those estimated from the batch experiments

Water Research published new progress about Analgesics. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Application of Diatrizoic Acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Boleda, M. Rosa published the artcileSurvey of the occurrence of pharmaceuticals in Spanish finished drinking waters, Recommanded Product: Diatrizoic Acid, the main research area is pharmaceutical tandem mass spectrometry finished drinking water pollution Spain.

Fifty samples of finished drinking waters (FDWs) from Spain covering 12 million inhabitants were tested for 53 pharmaceuticals pertaining to 12 different Anatomical Therapeutic Chem. (ATC) classification system codes. The studied compounds are a combination of most commonly consumed pharmaceuticals with other barely reported in the literature. Five compounds, azithromycin, clarithromycin, erythromycin, sulfamethoxazole, and ibuprofen were tentatively identified by liquid chromatog. coupled to tandem mass spectrometry (LC-MS/MS) in some samples (2 to 15 %), but only ibuprofen and azithromycin could be confirmed when analyzed by liquid chromatog.-high-resolution mass spectrometry (LC-HRMS) with a quadrupole-Orbitrap instrument. Concentration levels of ibuprofen in the pos. samples ranged from 12 to 17 ng/L (n = 6) while for azithromycin values from 5 to 9.5 ng/L (n = 3) were found. Ibuprofen fragmentation behavior in different mass spectrometry instrument configurations (triple quadrupole, quadrupole-ion trap, and quadrupole-Orbitrap) was evaluated.

Environmental Science and Pollution Research published new progress about Analgesics. 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

Cannalire, Rolando published the artcileBroad spectrum anti-flavivirus pyridobenzothiazolones leading to less infective virions, Application of 4-Methoxyphenylacetic acid, the main research area is dengue yellow fever virus antiflavivirus pyridobenzothiazolone; Antiviral small molecules; Antivirals; Dengue inhibitors; Flavivirus inhibitors; Flavivirus replication; Zika virus.

We report the design, synthesis, and biol. evaluation of a class of 1H-pyrido[2,1-b][1,3]benzothiazol-1-ones originated from compound 1, previously identified as anti-flavivirus agent. Some of the new compounds showed activity in low μM range with reasonable selectivity against Dengue 2, Yellow fever (Bolivia strain), and West Nile viruses. One of the most interesting mols., compound 16, showed broad antiviral activity against addnl. flaviviruses such as Dengue 1, 3 and 4, Zika, Japanese encephalitis, several strains of Yellow fever, and tick-borne encephalitis viruses. Compound 16 did not exert any effect on alphaviruses and phleboviruses and its activity was maintained in YFV infected cells from different species. The activity of 16 appears specific for flavivirus with respect to other virus families, suggesting, but not proving, that it might be targeting a viral factor. We demonstrated that the antiviral effect of 16 is not related to reduced viral RNA synthesis or virion release. On the contrary, viral particles grown in the presence of 16 showed reduced infectivity, being unable to perform a second round of infection. The chem. class herein presented thus emerges as suitable to provide pan-flavivirus inhibitors.

Antiviral Research published new progress about Alphavirus. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Application of 4-Methoxyphenylacetic acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Penner, Page M. published the artcileGeneration and Reactions of ε-Carbonyl Cations via Group 13 Catalysis, SDS of cas: 151-10-0, the main research area is electrophilic aromatic substitution carbonyl cation allylation catalyst; allylation; catalysis; electrophilic aromatic substitution; umpolung; ε-carbonyl cations.

The generation of ε-carbonyl cations and their reactions with nucleophiles is accomplished readily without transition metal cation stabilization, using the ε-bromide dienoate or dienone starting materials and GaCl3 or InCl3 catalysis. Arene nucleophiles are somewhat more straightforward than allyltrimethylsilane, but allyltrimethylsilane and propiophenone trimethysilyl enol ether each react successfully with InCl3 catalysis. The viability of these cations is supported by DFT calculations

Molecules published new progress about Allylation. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, SDS of cas: 151-10-0.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Yurino, Taiga published the artcileFriedel-Crafts-type Allylation of Phenol Derivatives Catalyzed by In Situ-Generated Silyl Cyanometallates, Recommanded Product: 1,3-Dimethoxybenzene, the main research area is Friedel Crafts allylation phenol derivative catalyzed silyl cyanometalate intermediate; allylic phosphate Friedel Crafts allylation palladium silver catalyzed cyanotrimethylsilane; anisole para allylated regioselective preparation.

Authors successfully demonstrated that Friedel-Crafts-type allylation of phenol derivatives and allylic phosphates is catalyzed by the AgTFA/trimethylsilyl cyanide (Me3SiCN) and Pd(OAc)2/Me3SiCN combined systems to afford the C-allylated product in a highly regioselective manner. The corresponding silyl cyanometallates generated in situ are proposed to be the active catalytic species. Lewis acidity of the reversibly formed ion pairs is appropriately regulated for this reaction. The para-allylated anisole and phenol derivatives are selectively obtained. The para-substituted ones are converted to the ortho-allylated products. The reactivity of the catalytic systems is strongly dependent on the electronic nature of both electrophile and nucleophile. Substitution of an aromatic ring on the allylic phosphate is essential for the reaction. Thus, the competitive reaction of a 1 : 1 mixture of cinnamyl and simple allyl phosphates affords only the cinnamyl-substituted product.

Asian Journal of Organic Chemistry published new progress about Allylation. 151-10-0 belongs to class isoquinoline, name is 1,3-Dimethoxybenzene, and the molecular formula is C8H10O2, Recommanded Product: 1,3-Dimethoxybenzene.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Ma, Pengju published the artcilePhotocatalyst- and additive-free decarboxylative alkylation of N-aryl tetrahydroisoquinolines induced by visible light, Formula: C9H10O3, the main research area is alkyl aryl tetrahydroisoquinoline preparation; tetrachlorohydroxyphthalimide alkyl ester aryl tetrahydroisoquinoline decarboxylative alkylation.

Synthesis of C-1 alkylated tetrahydroisoquinoline products I (R = Pr, 4-oxocyclohexyl, oxan-4-yl, etc.; R1 = Ph, pyridin-4-yl, naphthalen-1-yl, etc.; R2 = H. MeO) and II via a visible light induced decarboxylative alkylation of N-aryl tetrahydroisoquinolines III (X = H) and 9-methyl-2-phenyl-1H,2H,3H,4H,9H-pyrido[3,4-b]indole has been developed using tetrachloro-N-hydroxyphthalimide esters IV as alkylation agents. This redox-neutral reaction can proceed without the assistance of photocatalysts, transition metals and external additives by irradiation with blue LEDs. Preliminary mechanistic studies indicated that this transformation probably proceeded through an electron donor-acceptor complex involved radical process.

Organic Chemistry Frontiers published new progress about Alkylation. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Formula: C9H10O3.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Svec, Riley L. published the artcileImidazotetrazines as Weighable Diazomethane Surrogates for Esterifications and Cyclopropanations, Safety of 4-Methoxyphenylacetic acid, the main research area is repurpose imidazotetrazine weighable diazomethane synthon esterification cyclopropanation; alkylation; cyclopropanation; diazo compounds; diazomethane; imidazotetrazines.

Diazomethane is one of the most versatile reagents in organic synthesis, but its utility is limited by its hazardous nature. Although alternative methods exist to perform the unique chem. of diazomethane, these suffer from diminished reactivity and/or correspondingly harsher conditions. Herein, we describe the repurposing of imidazotetrazines (such as temozolomide, TMZ, the standard of care for glioblastoma) for use as synthetic precursors of alkyl diazonium reagents. TMZ was employed to conduct esterifications and metal-catalyzed cyclopropanations, and results show that Me ester formation from a wide variety of substrates is especially efficient and operationally simple. TMZ is a com. available solid that is non-explosive and non-toxic, and should find broad utility as a replacement for diazomethane.

Angewandte Chemie, International Edition published new progress about Alkylation. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Safety of 4-Methoxyphenylacetic acid.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Lu, Chunlei published the artcileDirect N-Alkylation/Fluoroalkylation of Amines Using Carboxylic Acids via Transition-Metal-Free Catalysis, Recommanded Product: 4-Methoxy-N-methylaniline, the main research area is amine carboxylic acid metal free fluoroalkylation; fluoroalkylamine preparation; carboxylic acid amine metal free alkylation; alkylamine preparation.

A scalable protocol of direct N-mono/di-alkyl/fluoroalkylation of primary/secondary amines was constructed with various carboxylic acids as coupling agents under the catalysis of a simple air-tolerant inorganic salt, K3PO4. Advantageous features include 100 examples, 10 drugs and drug-like amines, fluorinated complex tertiary amines, gram-scale synthesis and isotope-labeling amine, thus demonstrating the potential applicability in industry of this methodol. The involvement of relatively less reactive silicon-hydride compared with the traditional reactive metal-hydride or boron-hydride species required to reduce the amide intermediates presumably contributes to the remarkable functional group compatibility.

Advanced Synthesis & Catalysis published new progress about Alkylation. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Recommanded Product: 4-Methoxy-N-methylaniline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Schiesser, Stefan published the artcileN-Trifluoromethyl Amines and Azoles: An Underexplored Functional Group in the Medicinal Chemist’s Toolbox, Formula: C8H11NO, the main research area is trifluoromethyl amine azole synthesis solubility permeability drug discovery.

Introducing trifluoromethyl groups is a common strategy to improve the properties of biol. active compounds However, N-trifluoromethyl moieties on amines and azoles are very rarely used. To evaluate their suitability in drug design, we synthesized a series of N-trifluoromethyl amines and azoles, determined their stability in aqueous media, and investigated their properties. We show that N-trifluoromethyl amines are prone to hydrolysis, whereas N-trifluoromethyl azoles have excellent aqueous stability. Compared to their N-Me analogs, N-trifluoromethyl azoles have a higher lipophilicity and can show increased metabolic stability and Caco-2 permeability. Furthermore, N-trifluoromethyl azoles can serve as bioisosteres of N-iso-Pr and N-tert-Bu azoles. Consequently, we suggest that N-trifluoromethyl azoles are valuable substructures to be considered in medicinal chem.

Journal of Medicinal Chemistry published new progress about Alkylation. 5961-59-1 belongs to class isoquinoline, name is 4-Methoxy-N-methylaniline, and the molecular formula is C8H11NO, Formula: C8H11NO.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem