Day: November 17, 2022

Hu, Jiang-Lin published the artcileRuthenium-Catalyzed Enantioselective Addition of Carboxylic Acids to Allenes, Category: isoquinoline, the main research area is branched allylic ester enantioselective regioselective preparation; allene carboxylic acid addition ruthenium catalyst.

A ruthenium-catalyzed synthetic method for branched allylic esters I [R1 = TBSO(CH2)2, cyclopentyl, Ph(CH2)2, etc.; R2 = i-Pr, 2-thienyl, Ph, etc.] via addition of carboxylic acids to allenes was reported. Ligands were designed and prepared based on Josiphos skeleton, with which reaction achieved up to 95% yield and up to >99% enantiomeric excess. A deuterium labeling experiment was performed and a plausible mechanism was proposed. Enantiopure lactones of five- and six-membered ring were synthesized via a RCM reaction of branched allylic ester product.

ACS Catalysis published new progress about Addition reaction catalysts, stereoselective. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Category: isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Trost, Barry M. published the artcileBranched aldehydes as linchpins for the enantioselective and stereodivergent synthesis of 1,3-aminoalcohols featuring a quaternary stereocenter, Application of 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, the main research area is aminoalc preparation enantioselective diastereoselective; aldehyde Mannich aldol Henry alkyne addition zinc prophenol catalyst.

The use of branched aldehydes e.g., benzyl (S)-(1-(4-fluorophenyl)-2,2-dimethyl-3-oxopropyl)carbamate as versatile linchpins for various Zn-prophenol-catalyzed C-C bond-forming reactions to efficiently construct enantioenriched 1,3-aminoalcs. e.g., I bearing an acyclic quaternary stereogenic center was reported. The ability of the Zn-ProPhenol catalyst to selectively activate ambiphilic aldehydes first as nucleophiles for Mannich reactions and then as electrophiles for aldol, Henry and alkyne addition reactions allows for the one-pot synthesis of complex stereotriads from common building blocks. Moreover, this approach can be diastereodivergent by simply selecting the proper catalyst combination. Overall, this catalytic method directly transforms simple and readily available aldehydes into highly functionalized compounds and provides streamlined access to valuable 1,3-aminoalcs. relevant to the synthesis of biol. important mols.

Nature Catalysis published new progress about Addition reaction catalysts, stereoselective. 1205-17-0 belongs to class isoquinoline, name is 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde, and the molecular formula is C11H12O3, Application of 2-Methyl-3-(3,4-methylenedioxyphenyl)propionaldehyde.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Hilpert, Lukas J. published the artcileRhodium-Catalyzed Parallel Kinetic Resolution of Racemic Internal Allenes Towards Enantiopure Allylic 1,3-Diketones, Category: isoquinoline, the main research area is allene diketone parallel kinetic resolution rhodium enantioselective addition catalyst; allylic diketone enantiopure stereoselective preparation; 1,3-diketones; allenes; asymmetric catalysis; parallel kinetic resolution; rhodium.

A rare case of a parallel kinetic resolution of racemic 1,3-disubstituted allenes by means of a rhodium-catalyzed addition to 1,3-diketones furnishing enantiopure allylic 1,3-diketones is described. Mechanistic experiments demonstrate that the different allene enantiomers react in parallel to either the diastereomeric E- or Z-allylic 1,3-diketones with the same absolute configuration of the newly formed stereogenic center. A broad substrate scope demonstrates the synthetic utility of this new method.

Angewandte Chemie, International Edition published new progress about Addition reaction catalysts, stereoselective. 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Category: isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Greskowiak, Janek published the artcileThe uncertainty of biodegradation rate constants of emerging organic compounds in soil and groundwater – A compilation of literature values for 82 substances, Application of Diatrizoic Acid, the main research area is soil groundwater EOC biodegradation rate constant; Environmental biodegradation constants; Organic contaminants; Soil and groundwater; Uncertainty.

The present study reports on biodegradation rate constants of emerging organic compounds (EOCs) in soil and groundwater available in the literature. The major aim of this compilation was to provide an assessment of the uncertainty of hydrol. models with respect to the fate of EOCs. The literature search identified a total number of 82 EOCs for which 1st-order rate constants could be derived. It was found that for the majority of compounds degradation rate constants vary over more than three orders of magnitude. Correlation to factors that are well known to affect the degradation rate, such as temperature or redox condition was weak. No correlation at all was found with results from available quant. structure-activity relationship models. This suggests that many unknown site specific or exptl. specific factors influence the degradation behavior of EOCs in the environment. Thus, local and catchment scale predictive models to estimate EOC concentration at receptors, e.g., receiving waters or drinking water wells, need to consider the large uncertainty in 1st-order rate constants As a consequence, applying rate constants that were derived from one experiment or field site investigation to other experiments or field sites should be done with extreme caution.

Water Research published new progress about Biological water purification, biodegradation. 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

Jankovic, Nenad published the artcileDiscovery of the Biginelli hybrids as novel caspase-9 activators in apoptotic machines: Lipophilicity, molecular docking study, influence on angiogenesis gene and miR-21 expression levels, COA of Formula: C2H6N2O, the main research area is Biginelli scaffold selectivity index apoptosis caspase 9 lipophilicity; Apoptosis; Biginelli scaffold; Caspase-9; Lipophilicity; Selectivity index.

In order to investigate potential therapeutically agents, novel products of Biginelli reaction (4a-l) were synthesized and exposed to cytotoxic and caspase activities, angiogenesis, cell cycle distribution, gene and microRNA expression levels, lipophilicity assessment and docking study. Among the twelve novel compounds (4a-l) evaluated for the cytotoxic activity, five of them (4c, 4d, 4f, 4k and 4l) that showed excellent activity on the tested cell lines (HeLa, LS174 and A549) were selected for further evaluation. Interestingly, compound 4f has up to three times higher selectivity index (SI) towards cancer cells than cisplatin (on HeLa, LS174 and A549 SI = 18.2, 13.5 and 11.2, resp.). The obtained results from cell cycle distribution and caspase activity indicate that tested compounds (4c, 4d, 4f, 4k and 4l) promoted caspase-9 activation, implicated in the intrinsic pathway of apoptosis. Lipophilicity of 4a-l was determinate by using reversed-phase high-performance liquid chromatog.

Bioorganic Chemistry published new progress about Angiogenesis (influence on angiogenesis gene). 598-50-5 belongs to class isoquinoline, name is 1-Methylurea, and the molecular formula is C2H6N2O, COA of Formula: C2H6N2O.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Ye, Chen-Xi published the artcileStereocontrolled 1,3-nitrogen migration to access chiral α-amino acids, Application In Synthesis of 104-01-8, the main research area is chiral amino acid preparation regioselective enantioselective; azanyl ester preparation amination ruthenium iron catalyst; carboxylic acid hydroxylamine coupling reaction.

Here a protocol for the economical and practical synthesis of optically active α-amino acids RNHC(R1)(R2)C(O)OH (R = Ts, Ms, C(O)OMe, (2,2,2-trichloroethoxy)carbonyl; R1 = H, Me; R2 = pent-2-yn-1-yl, 4-methylphenyl, 2H-1,3-benzodioxol-5-yl, etc.) based on an unprecedented stereocontrolled 1,3-nitrogen shift was reported. The method employs abundant and easily accessible carboxylic acids R1CH(R2)C(O)OH as starting materials, which are first connected to a nitrogenation reagent, followed by a highly regio- and enantioselective ruthenium- or iron-catalyzed C(sp3)-H amination. This straightforward method displays a very broad scope, providing rapid access to optically active α-amino acids with aryl, allyl, propargyl and alkyl side chains, and also permits stereocontrolled late-stage amination of carboxylic-acid-containing drugs and natural products.

Nature Chemistry published new progress about Amination catalysts (regio-, stereoselective). 104-01-8 belongs to class isoquinoline, name is 4-Methoxyphenylacetic acid, and the molecular formula is C9H10O3, Application In Synthesis of 104-01-8.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Mondal, Atanu published the artcilePhosphine-Catalyzed Intramolecular Vinylogous Aldol Reaction of α-Substituted Enones, Related Products of isoquinoline, the main research area is indenone preparation diastereoselective; substituted enone intramol aldol phosphine catalyst.

The first phosphine-catalyzed intramol. vinylogous aldol reaction (IVAR) of α-substituted enones was demonstrated. This strategy provided access to various pentannulated (hetero)arenes and dibenzocycloheptanones incorporated with two contiguous stereocenters, one of which is an all-carbon quaternary center. The scope of this work was further broadened through elaborations of the IVAR adducts to (i) benzannulated nine-membered carbocyclic systems, (ii) interesting classes of 1,3-dienes, 1,3,5-trienes, and 1-yn-3,5-dienes, and (iii) the analogs of echinolactone D and russujaponol F.

Organic Letters published new progress about Aldol condensation catalysts, stereoselective. 21834-92-4 belongs to class isoquinoline, name is 5-Methyl-2-phenylhex-2-enal, and the molecular formula is C13H16O, Related Products of isoquinoline.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Kleywegt, Sonya published the artcileThe contribution of pharmaceutically active compounds from healthcare facilities to a receiving sewage treatment plant in Canada, Synthetic Route of 117-96-4, the main research area is pharmaceutical healthcare facility wastewater sewage Canada; Emerging contaminant; Healthcare facility; Pharmaceutically active compounds; Sewage treatment plant; Wastewater.

Concentrations and percent loadings of pharmaceutically active compounds (PhACs) and other emerging contaminants released from healthcare facilities (2 hospitals and a long-term care facility) to a sewage treatment plant (STP) in a large urban sewershed were evaluated. An addnl. hospital outside the sewershed was also monitored. Fourteen of the 24 steroids/hormones and 88 of the 117 PhACs and emerging contaminants were detected at least once. Commonly used substances, including cotinine, caffeine and its metabolite 1,7-dimethylxanthine, ibuprofen and naproxen (analgesics), venlafaxine (antidepressant), and N,N-diethyl-meta-toluamide (insect repellent), were detected in all samples at all sites. Concentrations detected in the large specialty hospital outside the sewershed were similar to those within the sewershed. Cytotoxic drugs (tamoxifen and cyclophosphamide) and x-ray contrast media (iopamidol and diatrizoic acid) were infrequently detected in hospital effluents. Anal. for antibiotics indicated that azithromycin, clarithromycin, ciprofloxacin, erythromycin, ofloxacin, and sulfamethoxazole were consistently detected in hospital wastewaters, as was triclosan (antibacterial agent). Fifteen compounds individually contributed >1% to the total PhAC and emerging contaminant load to the STP from the 2 hospitals in the sewershed, and 9 compounds in the STP effluent exceeded ecotoxicol. criteria. This survey demonstrates that point source discharges from healthcare facilities in this sewershed make a small contribution to the overall PhAC and emerging contaminant loading compared with the total concentrations entering the receiving STP. Environ Toxicol Chem 2015;9999:1-13. © 2015 SETAC.

Environmental Toxicology and Chemistry published new progress about Activated-sludge process wastewater treatment. 117-96-4 belongs to class isoquinoline, name is Diatrizoic Acid, and the molecular formula is C11H9I3N2O4, Synthetic Route of 117-96-4.

Referemce:
Isoquinoline – Wikipedia,
Isoquinoline | C9H7N – PubChem

Falas, Per published the artcileTracing the limits of organic micropollutant removal in biological wastewater treatment, Recommanded Product: Diatrizoic Acid, the main research area is biol wastewater treatment organic micropollutant removal tracing limit; Biological treatment; Degradation; Micropollutants; Pharmaceuticals; Redox; Wastewater.

Removal of organic micropollutants was investigated in 15 diverse biol. reactors through short and long-term experiments Short-term batch experiments were performed with activated sludge from three parallel sequencing batch reactors (25, 40, and 80 d solid retention time, SRT) fed with synthetic wastewater without micropollutants for one year. Despite the minimal micropollutant exposure, the synthetic wastewater sludges were able to degrade several micropollutants present in municipal wastewater. The degradation occurred immediately after spiking (1-5 μg/L), showed no strong or systematic correlation to the sludge age, and proceeded at rates comparable to those of municipal wastewater sludges. Thus, the results from the batch experiments indicate that degradation of organic micropollutants in biol. wastewater treatment is quite insensitive to SRT increases from 25 to 80 days, and not necessarily induced by exposure to micropollutants. Long-term experiments with municipal wastewater were performed to assess the potential for extended biol. micropollutant removal under different redox conditions and substrate concentrations (carbon and nitrogen). A total of 31 organic micropollutants were monitored through influent-effluent sampling of twelve municipal wastewater reactors. In accordance with the results from the sludges grown on synthetic wastewater, several compounds such as bezafibrate, atenolol and acyclovir were significantly removed in the activated sludge processes fed with municipal wastewater. Complementary removal of two compounds, diuron and diclofenac, was achieved in an oxic biofilm treatment. A few aerobically persistent micropollutants such as venlafaxine, diatrizoate and tramadol were removed under anaerobic conditions, but a large number of micropollutants persisted in all biol. treatments. Collectively, these results indicate that certain improvements in biol. micropollutant removal can be achieved by combining different aerobic and anaerobic treatments, but that these improvements are restricted to a limited number of compounds

Water Research published new progress about Activated-sludge process wastewater treatment. 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

Juarez, Ruben published the artcileIntegrating dissolved and particulate matter into a prediction tool for ozonation of organic micropollutants in wastewater, SDS of cas: 117-96-4, the main research area is organic micropollutant ozonation wastewater treatment plant; COD; Ozonation; Pharmaceuticals; Suspended solids; Wastewater.

Ozonation is an established technique used to reduce the discharge of organic micropollutants into the aquatic environment, but the possibility of predicting the ozone demand for different wastewater matrixes is still limited, especially in the presence of suspended solids (SS). A new tool for the prediction of the removal of organic micropollutants with ozone, based on dissolved and particulate matter in activated sludge effluents, was therefore developed. The removal of 25 organic micropollutants was determined on laboratory scale in the presence and absence of suspended solids. The linear trajectories of the dose-response curves enabled the determination of a new set of removal constants, based on dissolved COD (COD) and SS. The presence of SS had a more neg. effect on the removal of slow-reacting micropollutants (removal constant <3.5 mg CODCr,diss·mg O3-1) with ozone than on the fast-reacting micropollutants (removal constant >3.5 mg CODCr,diss·mg O3-1). However, the decreased removal of the organic micropollutants was generally small, <10%, at typical SS concentrations, <25 mg SS·L-1. Integration of the new removal constants based on COD and SS enabled the removal in an ozone pilot plant to be modelled with an average deviation of <10% for several organic micropollutants. The use of the frequently measured parameters, COD and SS, as input parameters could facilitate the future use of the tool to predict the removal of micropollutants during ozonation. Science of the Total Environment published new progress about Activated-sludge process wastewater treatment. 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