Month: December 2022

Tlahuext-Aca, Adrian published the artcileMulticomponent Oxyalkylation of Styrenes Enabled by Hydrogen-Bond-Assisted Photoinduced Electron Transfer, Recommanded Product: 2-Methyl-4-phenylbutanoic acid, the publication is Angewandte Chemie, International Edition (2017), 56(13), 3708-3711, database is CAplus and MEDLINE.

Herein, authors disclose a strategy for the activation of N-(acyloxy)phthalimides towards photoinduced electron transfer through hydrogen bonding. This activation mode enables efficient access to C(sp³)-centered radicals upon decarboxylation from bench-stable and readily available substrates. Moreover, they demonstrate that the formed alkyl radicals can be successfully employed in a novel redox-neutral method for constructing sp³-sp³ bonds across styrene moieties that gives straightforward access to complex alc. and ether scaffolds.

Angewandte Chemie, International Edition published new progress about 1949-41-3. 1949-41-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene, name is 2-Methyl-4-phenylbutanoic acid, and the molecular formula is C5H10Cl3O3P, Recommanded Product: 2-Methyl-4-phenylbutanoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Sauer, Scott J. published the artcileDirect Carbon-Carbon Bond Formation via Reductive Soft Enolization: A Kinetically Controlled syn-Aldol Addition of ¦Á-Halo Thioesters and Enolizable Aldehydes, Related Products of catalysis-chemistry, the publication is Journal of the American Chemical Society (2010), 132(40), 13997-13999, database is CAplus and MEDLINE.

The direct addition of enolizable aldehydes and ¦Á-halo thioesters to produce ¦Â-hydroxy thioesters enabled by reductive soft enolization is reported. The transformation is operationally simple and efficient and has the unusual feature of giving high syn-selectivity, which is the opposite of that produced for (thio)esters under conventional conditions. Moreover, excellent diastereoselectivity results when a chiral nonracemic ¦Á-hydroxy aldehyde derivative is used.

Journal of the American Chemical Society published new progress about 22693-41-0. 22693-41-0 belongs to catalysis-chemistry, auxiliary class Other Functionalization Reagent, name is 2,4,6-Triisopropylbenzenethiol, and the molecular formula is C15H24S, Related Products of catalysis-chemistry.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Andersen, Ida Vang published the artcileOptimization of Direct Aromatic 18F-Labeling of Tetrazines, Recommanded Product: Tetraethylammonium hydrogencarbonate, the publication is Molecules (2022), 27(13), 4022, database is CAplus and MEDLINE.

Radiolabeling of tetrazines has gained increasing attention due to their important role in pretargeted imaging or therapy. The most commonly used radionuclide in PET imaging is fluorine-18. For this reason, we have recently developed a method which enables the direct aromatic ¹⁸F-fluorination of tetrazines using stannane precursors through copper-mediated fluorinations. Herein, we further optimized this labeling procedure. 3-(3-fluorophenyl)-1,2,4,5-tetrazine was chosen for this purpose because of its high reactivity and resp. limited stability during the labeling process. By optimizing parameters such as elution conditions, precursor amount, catalyst, time or temperature, the radiochem. yield (RCY) could be increased by approx. 30%. These conditions were then applied to optimize the RCY of a recently successfully developed and promising pretargeting imaging agent. This agent could be isolated in a decay corrected RCY of 14 ¡À 3% and Am of 201 ¡À 30 GBq/¦Ìmol in a synthesis time of 70 min. Consequently, the RCY increased by 27%.

Molecules published new progress about 17351-61-0. 17351-61-0 belongs to catalysis-chemistry, auxiliary class Phase Transfer Catalyst, name is Tetraethylammonium hydrogencarbonate, and the molecular formula is C9H21NO3, Recommanded Product: Tetraethylammonium hydrogencarbonate.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Araujo, Raquel Silva published the artcileCloxacillin benzathine-loaded polymeric nanocapsules: Physicochemical characterization, cell uptake, and intramammary antimicrobial effect, Recommanded Product: N1,N2-Dibenzylethane-1,2-diamine, the publication is Materials Science & Engineering, C: Materials for Biological Applications (2019), 110006, database is CAplus and MEDLINE.

The present work shows the development and evaluation of the veterinary antibiotic cloxacillin benzathine loaded into poly-¦Å-caprolactone nanocapsules, as a potential new treatment strategy to manage bovine intramammary infections, such as mastitis. Staphylococcus aureus-induced mastitis is often a recurrent disease due to the persistence of bacteria within infected cells. The mean diameter of NC varied from 241 to 428 nm and from 326 to 375 nm, when determined by dynamic light scattering and by at. force microscopy, resp. In vitro release studies from the NC were performed in two media under sink conditions: PBS with 1% polyethylene glycol or milk. Free CLOXB dissolution occurred very fast in both media, while drug release from the NC was slower and incomplete (below 50%) after 9 h. CLOXB release kinetics from polymeric NC was fitted with the Korsmeyer-Peppas model indicating that CLOXB release is governed by diffusion following Fick’s law. Antimicrobial effect of the intramammary administration of CLOXB-PCL NC in cows with mastitis resulted in no clin. signs of toxicity and allowed complete pathogen elimination after treatment. The in vivo results obtained in this work suggest that CLOXB-PCL NC could be a promising formulation for the treatment of intramammary infections in cattle, considering their physicochem. properties, release profiles and effects on bovine mastitis.

Materials Science & Engineering, C: Materials for Biological Applications published new progress about 140-28-3. 140-28-3 belongs to catalysis-chemistry, auxiliary class Benzenes, name is N1,N2-Dibenzylethane-1,2-diamine, and the molecular formula is C16H20N2, Recommanded Product: N1,N2-Dibenzylethane-1,2-diamine.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Yu, Mingming published the artcileElectrochemical-induced benzyl C-H amination towards the synthesis of isoindolinones via aroyloxy radical-mediated C-H activation, Recommanded Product: 2-Methylbenzoic acid, the publication is Green Chemistry (2022), 24(4), 1445-1450, database is CAplus.

A novel electrochem. strategy to selectively and sustainably access isoindolinones I [R¹ = H, 7-Me, 5-F, etc.; R² = H, Me, Et, n-Pr, i-Pr, n-Bu; R³ = Me, n-Pr, i-Pr, n-Bu, cyclopropyl, CD₃] using simple o-alkyl benzoic acids and nitriles as substrates under metal catalyst and external oxidant-free conditions was developed. Meanwhile, nitrile as the nitrogen source plays a vital role, as its derived intermediate facilitates the construction of the amide bond in the product. Mechanistic investigations suggest that aroyloxy radicals were involved in this transformation, which initiated the benzylic C-H amination event by a 1,5-HAT process. The protocol showed a very good functional group tolerance.

Green Chemistry published new progress about 118-90-1. 118-90-1 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Natural product, name is 2-Methylbenzoic acid, and the molecular formula is C20H28B2O4S2, Recommanded Product: 2-Methylbenzoic acid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhang, Xuexin published the artcilePd(II)/Zn co-catalyzed chemo-selective hydrogenation of ¦Á-methylene-¦Ã-keto carboxylic acids, HPLC of Formula: 1949-41-3, the publication is Organic & Biomolecular Chemistry (2019), 17(8), 2174-2181, database is CAplus and MEDLINE.

An efficient Pd/Zn co-catalyzed chemo-selective hydrogenation of ¦Á-methylene-¦Ã-keto carboxylic acids was described. This methodol. offers a divergent synthesis of ¦Á-methyl-¦Ã-keto carboxylic acids, ¦Á-methylcarboxylic acids, and lactones starting from ¦Á-methylene-¦Ã-keto carboxylic acids via selective hydrogenation by varying the catalytic conditions avoiding the use of high pressure of hydrogen. The reaction also showed broad substrate tolerance to give the desired products in good to excellent yields.

Organic & Biomolecular Chemistry published new progress about 1949-41-3. 1949-41-3 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene, name is 2-Methyl-4-phenylbutanoic acid, and the molecular formula is C25H23NO4, HPLC of Formula: 1949-41-3.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhang, Xuexin published the artcilePd(II)/Zn co-catalyzed chemo-selective hydrogenation of ¦Á-methylene-¦Ã-keto carboxylic acids, Computed Properties of 15732-75-9, the publication is Organic & Biomolecular Chemistry (2019), 17(8), 2174-2181, database is CAplus and MEDLINE.

An efficient Pd/Zn co-catalyzed chemo-selective hydrogenation of ¦Á-methylene-¦Ã-keto carboxylic acids was described. This methodol. offers a divergent synthesis of ¦Á-methyl-¦Ã-keto carboxylic acids, ¦Á-methylcarboxylic acids, and lactones starting from ¦Á-methylene-¦Ã-keto carboxylic acids via selective hydrogenation by varying the catalytic conditions avoiding the use of high pressure of hydrogen. The reaction also showed broad substrate tolerance to give the desired products in good to excellent yields.

Organic & Biomolecular Chemistry published new progress about 15732-75-9. 15732-75-9 belongs to catalysis-chemistry, auxiliary class Alkenyl,Carboxylic acid,Benzene,Ketone, name is 2-Methylene-4-oxo-4-phenylbutanoic acid, and the molecular formula is C25H23NO4, Computed Properties of 15732-75-9.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Zhang, Benxiang published the artcileNi-electrocatalytic Csp³-Csp³ doubly decarboxylative coupling, Recommanded Product: 3-Benzoylpropionicacid, the publication is Nature (London, United Kingdom) (2022), 606(7913), 313-318, database is CAplus and MEDLINE.

Here, it was shown how a mildly reductive Ni-electrocatalytic system could couple two different carboxylates by means of in situ generated redox-active esters, termed doubly decarboxylative cross-coupling. This operationally simple method was used to heterocouple primary, secondary and even certain tertiary redox-active esters, thereby opening up a powerful new approach for synthesis. The reaction, which cannot be mimicked using stoichiometric metal reductants or photochem. conditions, tolerated a range of functional groups, was scalable and was used for the synthesis of 32 known compounds, reducing overall step counted by 73%.

Nature (London, United Kingdom) published new progress about 2051-95-8. 2051-95-8 belongs to catalysis-chemistry, auxiliary class Carboxylic acid,Benzene,Ketone, name is 3-Benzoylpropionicacid, and the molecular formula is Al2H32O28S3, Recommanded Product: 3-Benzoylpropionicacid.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Wan, Qiong-Qiong published the artcileA Cresyl Violet-Based Fluorescent Off-On Probe for the Detection and Imaging of Hypoxia and Nitroreductase in Living Organisms, Application In Synthesis of 10510-54-0, the publication is Chemistry – An Asian Journal (2014), 9(8), 2058-2062, database is CAplus and MEDLINE.

A new cresyl violet-based fluorescent off-on probe has been developed through a one-step synthesis for the detection of nitroreductase (NTR) and hypoxia. The detection mechanism is based on the NTR-catalyzed reduction of the probe to cresyl violet, accompanied with a large fluorescence enhancement at a long wavelength of 625 nm. The probe can detect NTR in aqueous solution with high selectivity and sensitivity, and the detection limit is 1 ng mL^-1 NTR. Most importantly, the probe has been successfully used to image not only NTR and hypoxia in living cells, but also the distribution of NTR in zebrafish in vivo.

Chemistry – An Asian Journal published new progress about 10510-54-0. 10510-54-0 belongs to catalysis-chemistry, auxiliary class Other Aromatic Heterocyclic,Salt,Amine,Inhibitor,Inhibitor, name is 5,9-Diaminobenzo[a]phenoxazin-7-ium acetate, and the molecular formula is C15H14Cl2S2, Application In Synthesis of 10510-54-0.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia

Athavale, Soumitra V. published the artcileBiocatalytic, Intermolecular C-H Bond Functionalization for the Synthesis of Enantioenriched Amides, Synthetic Route of 1293990-73-4, the publication is Angewandte Chemie, International Edition (2021), 60(47), 24864-24869, database is CAplus and MEDLINE.

Directed evolution of heme proteins has opened access to new-to-nature enzymic activity that can be harnessed to tackle synthetic challenges. Among these, reactions resulting from active site iron-nitrenoid intermediates present a powerful strategy to forge C-N bonds with high site- and stereoselectivity. Here authors report a biocatalytic, intermol. benzylic C-H amidation reaction operating at mild and scalable conditions. With hydroxamate esters as nitrene precursors, feedstock aromatic compounds can be converted to chiral amides with excellent enantioselectivity (up to >99% ee) and high yields (up to 87%). Kinetic and computational anal. of the enzymic reaction reveals rate-determining nitrenoid formation followed by stepwise hydrogen atom transfer-mediated C-H functionalization.

Angewandte Chemie, International Edition published new progress about 1293990-73-4. 1293990-73-4 belongs to catalysis-chemistry, auxiliary class Aliphatic Chain, name is O-Pivaloylhydroxylamine trifluoromethanesulfonate, and the molecular formula is C6H12F3NO5S, Synthetic Route of 1293990-73-4.

Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia