Month: December 2022

Wen, Kai-Ge published the artcileCatalytic Enantioselective Desymmetrization of Cyclobutane-1,3-diones by Carbonyl-Amine Condensation, Computed Properties of 1949-41-3, the publication is Organic Letters (2021), 23(3), 1118-1122, database is CAplus and MEDLINE.

A chiral phosphoric acid-catalyzed enantioselective condensation of 2,2-disubstituted cyclobutane-1,3-diones with a primary amine was described. This reaction offered a mild and efficient protocol for constructing quaternary carbon-containing cyclobutanes I [R¹ = Bn, (E)-PhCH=CHCH₂, 2-naphthylmethyl, etc.; Ar = Ph, C₆F₅, 2,4,6-Me₃-C₆H₂, etc.] in good to high yields and enantioselectivities. This reaction was first catalytic desymmetrizing carbonyl-amine condensation reaction and also represented first catalytic desymmetrizing reaction of prochiral cyclobutane-1,3-dione.

Organic Letters 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 C11H8F2, Computed Properties of 1949-41-3.

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

Cui, Wen published the artcileMitsunobu-reaction-based total solid-phase synthesis of Fanlizhicyclopeptide B, HPLC of Formula: 71989-31-6, the publication is Chemistry of Natural Compounds (2021), 57(6), 1086-1089, database is CAplus.

The first total synthesis of anti-inflammatory cyclic peptide fanlizhicyclopeptide B based on the Mitsunobu reaction is reported. The pre-made Fmoc-Tyr-OAllyl building block was coupled to the Wang resin via the Mitsunobu reaction catalyzed by triphenylphosphine and di-Et azodicarboxylate. After the remaining amino acids were assembled, macrocyclization was realized on solid support. Finally, the crude product was cleaved from resin and then purified by preparative reverse-phase high-performance liquid chromatog. (RP-HPLC) to provide the pure target fanlizhicyclopeptide B.

Chemistry of Natural Compounds published new progress about 71989-31-6. 71989-31-6 belongs to catalysis-chemistry, auxiliary class Amino acide derivatives,pyrrolidine, name is Fmoc-Pro-OH, and the molecular formula is C20H19NO4, HPLC of Formula: 71989-31-6.

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

Coker, Olabisi Oluwabukola published the artcileAltered gut metabolites and microbiota interactions are implicated in colorectal carcinogenesis and can be non-invasive diagnostic biomarkers, Quality Control of 63-68-3, the publication is Microbiome (2022), 10(1), 35, database is CAplus and MEDLINE.

Gut microbiota contributes to colorectal cancer (CRC) pathogenesis through microbes and their metabolites. The importance of microbiota-associated metabolites in colorectal carcinogenesis highlights the need to investigate the gut metabolome along the adenoma-carcinoma sequence to determine their mechanistic implications in the pathogenesis of CRC. To date, how and which microbes and metabolites interactively promote early events of CRC development are still largely unclear. We aim to determine gut microbiota-associated metabolites and their linkage to colorectal carcinogenesis. We performed metabolomics and metagenomics profiling on fecal samples from 386 subjects including 118 CRC patients, 140 colorectal adenomas (CRA) patients and 128 healthy subjects as normal controls (NC). We identified differences in the gut metabolite profiles among NC, CRA and CRC groups by partial least squares-discriminant and principal component analyses. Among the altered metabolites, norvaline and myristic acid showed increasing trends from NC, through CRA, to CRC. CRC-associated metabolites were enriched in branched-chain amino acids, aromatic amino acids and aminoacyl-tRNA biosynthesis pathways. Moreover, metabolites marker signature (twenty metabolites) classified CRC from NC subjects with an area under the curve (AUC) of 0.80, and CRC from CRA with an AUC of 0.79. Integrative analyses of metabolomics and metagenomics profiles demonstrated that the relationships among CRC-associated metabolites and bacteria were altered across CRC stages; certain associations exhibited increasing or decreasing strengths while some were reversed from neg. to pos. or vice versa. Combinations of gut bacteria with the metabolite markers improved their diagnostic performances; CRC vs NC, AUC: 0.94; CRC vs CRA, AUC 0.92; and CRA vs NC, AUC: 0.86, indicating a potential for early diagnosis of colorectal neoplasia. This study underscores potential early-driver metabolites in stages of colorectal tumorigenesis. The Integrated metabolite and microbiome anal. demonstrates that gut metabolites and their association with gut microbiota are perturbed along colorectal carcinogenesis.

Microbiome published new progress about 63-68-3. 63-68-3 belongs to catalysis-chemistry, auxiliary class Natural product, name is (S)-2-Amino-4-(methylthio)butanoic acid, and the molecular formula is C5H11NO2S, Quality Control of 63-68-3.

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

Lutskii, A. E. published the artcileInteraction of substituents through aromatic rings connected by a bridge group, Recommanded Product: Bis(4-nitrophenyl)amine, the publication is Zhurnal Obshchei Khimii (1965), 35(12), 2083-90, database is CAplus.

Detailed examination of the absorption spectra was made of ArZArAr’ compounds where Ar groups were C₆H₄Y groups containing as p-substituents such groups as Cl, HO, MeO, NH₂, NO₂, NMe₂, while Z were bridge units such as CH:CH, CH:CHC₆H₄CH:CH-p, S, NH, CH₂, Cú·C, or I⁺ (iodonium salts). It was shown that in such bridged compounds in the absence of Z bridge groups containing electrons and during optical excitation, there is an absence of charge transfer between the functional groups present in the Ar groups; the absorption bands contain only electron transitions between levels characteristic of functional groups of the individual Ar groups sep.

Zhurnal Obshchei Khimii published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Recommanded Product: Bis(4-nitrophenyl)amine.

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

Iogansen, A. V. published the artcileThe effect of conjugation on the infrared spectra of nitro compounds, Quality Control of 1821-27-8, the publication is Doklady Akademii Nauk SSSR (1963), 153(6), 1367-9, database is CAplus.

Tabulated for RNO₂ (R = Me, cyclohexyl, 1-cyclohexenyl, 1-naphthyl), p-RC₆H₄NO₂ (I, R = H, Cl, Me, I, OH, NH₂, NMe₂, NEt₂), o-dinitrobenzene, and 4,4′-dinitrodiphenylamine are the integrated intensities (A) of the sym. and asym. bands at 1300-1400 and 1500-1600 cm.^-1, resp. With increasing conjugation, A_sym. increased greatly, becoming the strongest band in the spectra, while A_asym. remained constant Addnl. values of A_sym. were calculated from the intensities of Raman bands for I (R = tert-Bu, vinyl, Ph, 1,3-butadien-1-yl, ¦Â-styryl, and ¦Á-phenyl-¦Â-styryl). The length of the conjugated system as projected on the C-N plane is proportional to (A_sym.)^1/2. Differentiation of conjugated and nonconjugated nitro compounds is greatly facilitated.

Doklady Akademii Nauk SSSR published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Quality Control of 1821-27-8.

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

Iogansen, A. V. published the artcileEffect of the intermolecular and vibration interactions on the infrared absorption bands of nitro groups, Quality Control of 1821-27-8, the publication is Optika i Spektroskopiya (1964), 16(4), 700-2, database is CAplus.

The influence of solvent and H bonds on the frequencies and integral intensities of the bands of symmetry (v_s. A_s) and anti-symmetry (¦Í_as, A_as) of nitro group valence vibrations was studied in an investigation of the infrared spectra of nitro compounds The accuracy of the frequency determination was ¡À0.5 cm.^-1, and of the integral intensity, was 5-10%. For PhNO₂ and MeNO₂ in such solvents as cyclohexane, CCl₄, dioxane, CHCl₃, CHBr₃, tetrachloroethylene, BuOH, and piperidine, the intensity changes and frequency shifts of both bands were insignificant. The bands of the valence vibrations of the nitro group were only slightly susceptible to internal interactions and to H bonding. Splitting of the v_s bands was indicated for all aromatic p-nitro amino compounds, such as p-nitroaniline, p-nitrodimethylaniline, and p-nitrodiethylaniline. The infrared absorption spectra of solutions of p-nitroaniline and p-nitrodimethylaniline in CHCl₃ and dioxane are presented. The behavior of the ¦Í_s components of p-nitroaniline in dioxane indicated that formation of H bonds between the NH₂ and dioxane influenced the C-N vibration so as to change the condition for resonance of NO₂ and CN, as well as the intensity distribution. Such behavior was lacking in p-nitrodi- methylaniline, where there is no NH linkage.

Optika i Spektroskopiya published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Quality Control of 1821-27-8.

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

Badir, Shorouk O. published the artcilePhotoredox-mediated hydroalkylation and hydroarylation of functionalized olefins for DNA-encoded library synthesis, SDS of cas: 2051-95-8, the publication is Chemical Science (2021), 12(36), 12036-12045, database is CAplus and MEDLINE.

DNA-encoded library (DEL) technol. features a time- and cost-effective interrogation format for the discovery of therapeutic candidates in the pharmaceutical industry. To develop DEL platforms, the implementation of water-compatible transformations that facilitate the incorporation of multifunctional building blocks (BBs) with high C(sp³) carbon counts is integral for success. In this report, a decarboxylative-based hydroalkylation of DNA-conjugated trifluoromethyl-substituted alkenes enabled by single-electron transfer (SET) and subsequent hydrogen atom termination through electron donor-acceptor (EDA) complex activation was detailed. In a further photoredox-catalyzed hydroarylation protocol, the coupling of functionalized, electronically unbiased olefins was achieved under air and within minutes of blue light irradiation through the intermediacy of reactive (hetero)aryl radical species with full retention of the DNA tag integrity. Notably, these processes operate under mild reaction conditions, furnishing complex structural scaffolds with a high d. of pendant functional groups.

Chemical Science 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 C10H10O3, SDS of cas: 2051-95-8.

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

Jansson, Mikael published the artcileEvaluation of micellar radii and counterion binding from self-diffusion coefficients as applied to ionic/zwitterionic mixed micellar systems, Application In Synthesis of 2016-56-0, the publication is Journal of Physical Chemistry (1988), 92(23), 6689-93, database is CAplus.

The radii of mixed ionic-zwitterionic micelles have been obtained from micellar self-diffusion data by taking intermicellar interactions into account via a kinetic theory of Brownian motion. Exptl. self-diffusion data of counterions, surfactants, and micellar aggregates were obtained for the complete composition interval for the systems (dodecyldimethylammonio)propanesulfonate (DDAPS)/Li dodecylsulfate and DDAPS/dodecylammonium acetate. A considerably different dependence of mixed micellar radius on composition was observed in the 2 systems. Aggregates containing the anionic amphiphile were found to be larger than the corresponding cationic mixed micelles throughout the complete composition interval. As a check for consistency, the micellar radii were used as input values in model calculations of fractional ion binding ratios. A good agreement was observed with exptl. ion association data.

Journal of Physical Chemistry published new progress about 2016-56-0. 2016-56-0 belongs to catalysis-chemistry, auxiliary class Active Esterification, name is Dodecylamineacetate, and the molecular formula is C14H31NO2, Application In Synthesis of 2016-56-0.

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

Grinev, Vyacheslav S. published the artcileCrystal structures, packing features, Hirshfeld surface analyses and DFT calculations of hydrogen-bond energy of two homologous 8a-aryl-2,3,4,7,8,8a-hexahydropyrrolo[1,2-a]pyrimidin-6(1H)-ones, SDS of cas: 2051-95-8, the publication is Acta Crystallographica, Section C: Structural Chemistry (2020), 76(5), 483-489, database is CAplus and MEDLINE.

The crystal structures and packing features of two homologous Meyer’s bicyclic lactams with fused pyrrolidone and medium-sized perhydropyrimidine rings, namely, 8a-phenyl-2,3,4,7,8,8a-hexahydropyrrolo[1,2-a]pyrimidin-6(1H)-one, C₁₃H₁₆N₂O (1), and 8a-(4-methylphenyl)-2,3,4,7,8,8a-hexahydropyrrolo[1,2-a]pyrimidin-6(1H)-one, C₁₄H₁₈N₂O (2), were elucidated, and Hirshfeld surface plots were calculated and drawn for visualization and a deeper anal. of the intermol. noncovalent interactions. Mols. of 1 and 2 are weakly linked by intermol. C=O¡¤¡¤¡¤H-N hydrogen bonds into chains, which are in turn weakly linked by other C=O¡¤¡¤¡¤H-C_ar interactions. The steric volume of the substituent significantly affects the crystal packing pattern.

Acta Crystallographica, Section C: Structural Chemistry 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 C10H10O3, SDS of cas: 2051-95-8.

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

Alvarez-Buylla, Arturo published the artcileCresyl violet: a red fluorescent Nissl stain, Formula: C18H15N3O3, the publication is Journal of Neuroscience Methods (1990), 33(2-3), 129-33, database is CAplus and MEDLINE.

A method is described for using cresyl violet as a red fluorescent Nissl stain. Unlike the bright-filed staining technique, fluorescent cresyl is compatible with other fluorescent dyes and tracers, such as fluorescein, Fluoro-Gold and Fast Blue. The procedure requires only minor modifications of routine bright-filed cresyl staining, the most significant being dilution of the stain. Thus, fluorescent red cresyl violet is simple to implement and may be of general use in fluorescence microscopy.

Journal of Neuroscience Methods 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 C18H15N3O3, Formula: C18H15N3O3.

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