Day: November 21, 2022

Parisien-Collette, Shawn published the artcilePhotochemical Synthesis of Carbazoles Using an [Fe(phen)₃](NTf₂)₂/O₂ Catalyst System: Catalysis toward Sustainability, Related Products of isoxazole, the publication is Organic Letters (2016), 18(19), 4994-4997, database is CAplus and MEDLINE.

An increasingly sustainable photochem. synthesis of carbazoles was developed using a catalytic system of Fe(phen)₃(NTf₂)₂/O₂ under continuous flow conditions and was demonstrated on gram-scale using a numbering-up strategy. Photocyclization of triaryl and diarylamines into the corresponding carbazoles occurs in general in higher yields than with previously developed photocatalysts.

Organic Letters published new progress about 57103-14-7. 57103-14-7 belongs to isoxazole, auxiliary class Fused Tricycles,Carbazoles, name is 9-(4-Fluorophenyl)-9H-carbazole, and the molecular formula is C18H12FN, Related Products of isoxazole.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Hu, Wangcheng published the artcileConstruction of isoxazolone-fused phenanthridines via Rh-catalyzed cascade C-H activation/cyclization of 3-arylisoxazolones with cyclic 2-diazo-1,3-diketones, Safety of 3-Phenylisoxazol-5(2H)-one, the publication is Organic & Biomolecular Chemistry (2021), 19(3), 552-556, database is CAplus and MEDLINE.

A Rh(III)-catalyzed cascade C-H activation/intramol. cyclization of 3-aryl-5-isoxazolones with cyclic 2-diazo-1,3-diketones was described, leading to the formation of isoxazolo[2,3-f]phenanthridine skeletons I [R¹ = 4-Me, 5-Br, 6-MeO, etc.; R² = H, Me; R³ = H, Me, Ph]. The protocol featured the simultaneous one-pot formation of two new C-C/C-N bonds and one heterocycle in moderate-to-good yields with good functional group compatibility. It was amenable to large-scale synthesis and further transformation.

Organic & Biomolecular Chemistry published new progress about 1076-59-1. 1076-59-1 belongs to isoxazole, auxiliary class Oxazoline,Benzene,Ester, name is 3-Phenylisoxazol-5(2H)-one, and the molecular formula is C9H7NO2, Safety of 3-Phenylisoxazol-5(2H)-one.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Nakamuro, Takayuki published the artcileEnantioselective Denitrogenative Annulation of 1H-Tetrazoles with Styrenes Catalyzed by Rhodium, HPLC of Formula: 2251-79-8, the publication is Angewandte Chemie, International Edition (2018), 57(19), 5497-5500, database is CAplus and MEDLINE.

Sulfonylation of 1H-tetrazoles with triflic anhydride in the presence of chiral rhodium(II) carboxylate dimers causes denitrogenation to generate α-azo rhodium(II) carbenoid species as new types of donor/acceptor carbenoids, which then readily react with styrenes to afford 3,5-diaryl-2-pyrazolines with a high degree of enantioselectivity. Thus, e.g., reaction of 5-phenyl-1H-tetrazole with styrene and Tf₂O in presence of 2,4,6-tri-tert-butylpyridine and a chiral Rh₂L₄ complex in ethylcyclohexane afforded I (84%, 96% ee).

Angewandte Chemie, International Edition published new progress about 2251-79-8. 2251-79-8 belongs to isoxazole, auxiliary class Trifluoromethyl,Fluoride,Benzene, name is 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, and the molecular formula is C8H5F3N4, HPLC of Formula: 2251-79-8.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Miura, Tomoya published the artcileRegioselective 1,3-Dipolar Cycloaddition of Nitriles with Nitrile Imines Generated from Tetrazoles, Quality Control of 2251-79-8, the publication is Chemistry Letters (2021), 50(1), 131-135, database is CAplus.

A synthesis of 3,5-disubstituted-1,2,4-triazoles from nitriles and 5-aryltetrazoles was reported. When 5-aryltetrazoles were triflylated in the presence of nitriles, the resulting 5-aryl-2-triflyltetrazoles thermally generated N-triflyl-nitrile imines through a sequence of ring-chain tautomerization and denitrogenation. The N-triflyl-nitrile imines immediately underwent 1,3-dipolar cycloaddition with nitriles in a regioselective manner, forming the corresponding 1,2,4-triazoles.

Chemistry Letters published new progress about 2251-79-8. 2251-79-8 belongs to isoxazole, auxiliary class Trifluoromethyl,Fluoride,Benzene, name is 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, and the molecular formula is C8H5F3N4, Quality Control of 2251-79-8.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Cantillo, David published the artcileAn Experimental and Computational Assessment of Acid-Catalyzed Azide-Nitrile Cycloadditions, Product Details of C8H5F3N4, the publication is Journal of Organic Chemistry (2012), 77(23), 10882-10890, database is CAplus and MEDLINE.

The mechanism of the azide-nitrile cycloaddition mediated by different Bronsted and Lewis acids has been addressed through DFT calculations In all cases activation of the nitrile substrate by the Bronsted or Lewis acid catalyst was found to be responsible for the rate enhancement. According to DFT calculations the cycloaddition proceeds in a stepwise fashion involving the initial formation of an open-chain imidoyl azide intermediate. Kinetic experiments performed using N-methyl-2-pyrrolidone as solvent and sodium azide as azide source demonstrate that all evaluated Bronsted acids have the same efficiency toward cycloaddition with benzonitrile, suggesting that hydrazoic acid is the actual dominant catalytic species in these tetrazole syntheses. Lewis acids such as Zn or Al salts perform in a similar manner, activating the nitrile moiety and leading to an open-chain intermediate that subsequently cyclizes to produce the tetrazole nucleus. The most efficient catalyst evaluated was 5-azido-1-methyl-3,4-dihydro-2H-pyrrolium azide, which can readily be generated in situ from aluminum chloride, sodium azide in N-methyl-2-pyrrolidone. The efficiency of this catalyst has been examined by preparation of a series of 5-substituted-1H-tetrazoles. The desired tetrazole structures were obtained in high yields within 3-10 min employing controlled microwave heating.

Journal of Organic Chemistry published new progress about 2251-79-8. 2251-79-8 belongs to isoxazole, auxiliary class Trifluoromethyl,Fluoride,Benzene, name is 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, and the molecular formula is C8H5F3N4, Product Details of C8H5F3N4.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Cantillo, David published the artcileMechanistic Insights on Azide-Nitrile Cycloadditions: On the Dialkyltin Oxide-Trimethylsilyl Azide Route and a New Vilsmeier-Haack-Type Organocatalyst, Computed Properties of 2251-79-8, the publication is Journal of the American Chemical Society (2011), 133(12), 4465-4475, database is CAplus and MEDLINE.

The mechanism of the azide-nitrile cycloaddition mediated by the known dialkylltin oxide-trimethylsilyl azide catalyst system was addressed through DFT calculations The catalytic cycle for this tin/silicon complex-based mechanism was thoroughly examined, disclosing the most plausible intermediates and the energetics involved in the rate enhancement. A new catalyst, 5-azido-1-methyl-3,4-dihydro-2H-pyrrolium azide, is presented for the formation of tetrazoles by cycloaddition of sodium azide with organic nitriles under neutral conditions. The efficiency of this organocatalyst, generated in situ from N-methyl-2-pyrrolidone (NMP), sodium azide, and trimethylsilyl chloride under reaction conditions, was examined by preparation of 5-substituted-1H-tetrazoles. The desired target structures were obtained in high yields within 15-25 min employing controlled microwave heating. An in depth computational anal. of the proposed catalytic cycle also was addressed to understand the nature of the rate acceleration. The computed energy barriers were compared to the dialkylltin oxide-trimethylsilyl azide metal-based catalyst system. Both the tin/silicon species and the new organocatalyst accelerate the azide-nitrile coupling by activating the nitrile substrate. As compared to the dialkylltin oxide-trimethylsilyl azide method, the organocatalytic system presented herein has the advantage of higher reactivity, in situ generation from inexpensive materials, and low toxicity.

Journal of the American Chemical Society published new progress about 2251-79-8. 2251-79-8 belongs to isoxazole, auxiliary class Trifluoromethyl,Fluoride,Benzene, name is 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, and the molecular formula is C8H5F3N4, Computed Properties of 2251-79-8.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Zu, Bing published the artcileCatalytic Enantioselective Construction of Chiroptical Boron-Stereogenic Compounds, Product Details of C24H22N2O2, the publication is Journal of the American Chemical Society (2021), 143(39), 16302-16310, database is CAplus and MEDLINE.

The construction of main group heteroatom-stereogenic compounds is of great importance due to their intriguing chem., phys., biol., and stereoelectronic properties. Despite that organoboron compounds are widely used in organic chem., the creation of a tetrahedral B-stereogenic center in one enantiomeric form remains highly challenging. Given the labile nature of ligands attached to the tetracoordinate B atom, only a handful of enantioenriched B-stereogenic compounds are reported via resolution or a chiral substrate-induced diastereoselective approach. To date catalytic asym. synthesis of B-stereogenic compounds has remained unknown. Here, the authors demonstrate the 1st catalytic enantioselective construction of B-stereogenic compounds via an asym. Cu-catalyzed azide-alkyne cycloaddition (CuAAC) reaction. This enantioselective CuAAC reaction not only gives access to a wide range of novel highly functionalized B-stereogenic heterocycles in high yields with good to excellent enantioselectivities but also produces optically active terminal alkyne and triazole moieties with various potential application prospects. Further transformation of the chiral tetracoordinate B compounds delivers several complex heterocyclic entities bearing B-stereogenic centers without the loss of enantiopurity. Also, the x-ray structure, the barrier to racemization, and the HOMO/LUMO gap of selected tetracoordinate B compounds were studied. Notably, these novel N,N π-conjugated B-stereogenic compounds exhibit bright fluorescence. The optical properties, including CD, quantum yield, and circular polarized luminescence spectroscopies, were examined These features expand the chem. space of the chiroptical B-based dye platform, which could have great potential applications in chiral optoelectronic materials.

Journal of the American Chemical Society published new progress about 182122-10-7. 182122-10-7 belongs to isoxazole, auxiliary class BOX or PyBox,BOX or PyBox, name is (3aS,3a’S,8aR,8a’R)-2,2′-(Cyclobutane-1,1-diyl)bis(3a,8a-dihydro-8H-indeno[1,2-d]oxazole), and the molecular formula is C7H10BNO3, Product Details of C24H22N2O2.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Zhu, Cai-Cai published the artcileSynthesis of asymmetric biphenyl derivatives for optoelectronic applications, Name: 9-(4-Fluorophenyl)-9H-carbazole, the publication is Optical Materials (Amsterdam, Netherlands) (2013), 35(12), 2095-2101, database is CAplus.

We report the synthesis and optical properties of a series of ten organic compounds with biphenyl as the backbone and asym. modified by triphenylamines, carbazoles and tetraphenylsilanes (BP 1-10). BP 1-10 were synthesized mainly by Ullmann coupling reaction and Suzuki cross-coupling reaction and characterized by EA, NMR, MS, UV-Vis, DSC, TGA, fluorescence spectra and cyclic voltammetry. They exhibit reversible electrochem. behavior with low oxidation potentials and emit intense pure-blue light with high fluorescence quantum yields (up to 80%). BP 1 was fabricated into multi-layered light-emitting diodes as blue-emitting, host and hole transport materials. Based on the performance of BP 1 and the similarity in chem. structure to those compounds reported in literature, these compounds are expected to be good and versatile hole transport, host and blue emitting materials.

Optical Materials (Amsterdam, Netherlands) published new progress about 57103-14-7. 57103-14-7 belongs to isoxazole, auxiliary class Fused Tricycles,Carbazoles, name is 9-(4-Fluorophenyl)-9H-carbazole, and the molecular formula is C24H20Ge, Name: 9-(4-Fluorophenyl)-9H-carbazole.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

Yu, Chengxuan published the artcileClinical characteristics of hospitalized patients with drug-induced acute kidney injury and associated risk factors: a case-control study, Category: isoxazole, the publication is BioMed Research International (2020), 9742754, database is CAplus and MEDLINE.

Drug-induced acute kidney injury (D-AKI) is increasingly common and can extend the hospital length of stay and increase mortality. This study is aimed at analyzing the clin. characteristics of hospitalized patients with D-AKI and the associated risk factors in a multidrug environment. A retrospective study among hospitalized patients was conducted in July 2019 based on the Adverse Drug Events Active Surveillance and Assessment System-2 developed by the authors. Four controls were matched with each case according to the matching criteria. The risk factors for D-AKI were identified by binary multivariate logistic regression. A total of 23,073 patients were hospitalized in July 2019, 21,131 of whom satisfied the inclusion criteria. The independent risk factors for D-AKI consisted of alc. abuse (odds ratio (OR), 2.05; 95% confidence interval (CI), 1.04-4.07), nonsteroidal anti-inflammatory drug (NSAID) use (OR, 2.39; 95% CI, 1.25-4.58), diuretic use (OR, 2.64; 95% CI, 1.42-4.92), prior anemia (OR, 4.10; 95% CI, 1.94-8.67), and prior chronic kidney disease (OR, 2.33; 95% CI, 1.07-5.08). The occurrence of D-AKI in hospitalized patients had significant associations with alc. abuse, combination therapy with NSAIDs or diuretics, and prior anemia or chronic kidney disease. Clinicians should meticulously follow patients with the above characteristics.

BioMed Research International published new progress about 198470-85-8. 198470-85-8 belongs to isoxazole, auxiliary class Immunology/Inflammation,COX, name is Sodium ((4-(5-methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)(propionyl)amide, and the molecular formula is C4H6O3, Category: isoxazole.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem

El Kaim, Laurent published the artcileThree-component Nef-Huisgen access to 1,2,4-triazoles, Application In Synthesis of 2251-79-8, the publication is Synlett (2009), 1315-1317, database is CAplus.

A three-component triazole synthesis involving a Nef-Huisgen cascade reaction is described. After the α-addition of acyl chlorides onto isocyanides (Nef reaction), the resulting imidoyl chloride is treated with tetrazoles under suitable activation (ZnCl₂). The resulting adduct is unstable and evolves according to the Huisgen reaction.

Synlett published new progress about 2251-79-8. 2251-79-8 belongs to isoxazole, auxiliary class Trifluoromethyl,Fluoride,Benzene, name is 5-(4-(Trifluoromethyl)phenyl)-1H-tetrazole, and the molecular formula is C8H5F3N4, Application In Synthesis of 2251-79-8.

Referemce:
https://en.wikipedia.org/wiki/Isoxazole,
Isoxazole | C3H3NO – PubChem