Category: 1468-83-3

Zou, Tingting published the artcileFlavour precursor peptide from an enzymatic beef hydrolysate Maillard reaction-II: Mechanism of the synthesis of flavour compounds from a sulphur-containing peptide through a Maillard reaction, Application of 3-Acetylthiophene, the main research area is beef hydrolyzate Maillard reaction product dimethylthiazole isobutylpyrazine.

This study aims to investigate the Maillard reaction products (MRPs) generated between enzymic beef hydrolyzated sulfur-containing oligopeptides and xylose subjected to heat treatment. The priority of the meat aroma contribution is Cys-Gly-Val > GSH > Leu-Cys, whereas Val-Met is relatively Maillard inert. Two peptide-specific aroma compounds, namely, 2-Isobutylpyrazine and 4-butyl-2,5-dimethylthiazole, were produced in a Leu-Cys Maillard reaction system at pH 5.5, showing that the dipeptides with Leu in the N-terminus exhibited high Maillard reactivity. The carbon source and generation pathway of the aroma-active compounds were demonstrated by carbohydrate module labeling (CAMOLA). A new pyrazine generation pathway with xylose-contributed C2 was proposed using this method specifically. Ultra-performance liquid chromatog.-electrospray ionization/quadrupole-time-of-flight tandem mass spectrometry (UPLC-ESI-Q-TOF MS/MS) was then used to analyze the peptide-specific MRPs to reveal the peptide cleavage, cyclization, and crosslinking with other reactants and intermediates. The main results of this study include that crosslinking between reactants and their intermediates largely occurred in a peptide-specific Maillard reaction; its oligopeptide-specific MRPs were first demonstrated; and the crosslinking products from cyclopeptides and two xyloses and/or their fragments were observed for the first time.

LWT–Food Science and Technology published new progress about Beef. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Application of 3-Acetylthiophene.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Marko, Jason A. published the artcileElectrochemical benzylic oxidation of C-H bonds, HPLC of Formula: 1468-83-3, the main research area is electrochem benzylic oxidation carbon hydrogen bond.

Oxidized products have become increasingly valuable as building blocks for a wide variety of different processes and fine chem., especially in the benzylic position. The authors report herein a sustainable protocol for this transformation through C-H functionalization and was performed using electrochem. as the main power source and tert-Bu hydroperoxide as the radical source for the C-H abstraction. The temperature conditions reported here do not increase >50° and use an aqueous-based medium. A broad substrate scope is explored, along with bioactive mols., to give comparable and increased product yields when compared to prior reported literature without the use of electrochem.

Chemical Communications (Cambridge, United Kingdom) published new progress about C-H bond. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, HPLC of Formula: 1468-83-3.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Zakidou, Panagiota published the artcileSingle Origin Coffee Aroma: From Optimized Flavor Protocols and Coffee Customization to Instrumental Volatile Characterization and Chemometrics, HPLC of Formula: 1468-83-3, the main research area is coffee aroma flavor instrumental volatile characterization chemometrics; GC-MS; HCA; HS-SPME; Heatmap; Maillard reaction; PCA; chemometrics; coffee cupping; flavor; geographical origin.

In this study, the aroma profile of 10 single origin Arabica coffees originating from eight different growing locations, from Central America to Indonesia, was analyzed using Headspace SPME-GC-MS as the anal. method. Their roasting was performed under temperature-time conditions, customized for each sample to reach specific sensory brew characteristics in an attempt to underline the customization of roast profiles and implementation of sep. roastings followed by subsequent blending as a means to tailor cup quality. A total of 138 volatile compounds were identified in all coffee samples, mainly furan (∼24-41%) and pyrazine (∼25-39%) derivatives, many of which are recognized as coffee key odorants, while the main formation mechanism was the Maillard reaction. Volatile compounds’ composition data were also chemometrically processed using the HCA Heatmap, PCA and HCA aiming to explore if they meet the expected aroma quality attributes and if they can be an indicator of coffee origin. The desired brew characteristics of the samples were satisfactorily captured from the volatile compounds formed, contributing to the aroma potential of each sample. Furthermore, the volatile compounds presented a strong variation with the applied roasting conditions, meaning lighter roasted samples were efficiently differentiated from darker roasted samples, while roasting degree exceeded the geog. origin of the coffee. The coffee samples were distinguished into two groups, with the first two PCs accounting for 73.66% of the total variation, attributed mainly to the presence of higher quantities of furans and pyrazines, as well as to other chem. classes (e.g., dihydrofuranone and phenol derivatives), while HCA confirmed the above results rendering roasting conditions as the underlying criterion for differentiation.

Molecules published new progress about Acidity. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, HPLC of Formula: 1468-83-3.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Hu, Yongzhi published the artcileElectrochemical oxidative synthesis of 2-benzoylquinazolin-4(3H)-one via C(sp3)-H amination under metal-free conditions, Quality Control of 1468-83-3, the main research area is benzoylquinazolinone green preparation; aminobenzamide ketone electrochem oxidative amination TBAI catalyst.

An electrochem. induced C(sp3)-H amination of 2-aminobenzamides with ketones using TBAI as a catalyst was developed to provide 2-benzoylquinazolin-4(3H)-ones I [R1 = H, 6-F, 7-Me, etc.; R2 = Ph, 2-pyridyl, 3-MeC6H4, etc.] under metal-free conditions. The reaction proceeded using the relatively low-toxicity methanol as the solvent, employed mol. oxygen as the ideal green oxidant in a simple undivided cell and exhibited high atom economy.

Catalysis Science & Technology published new progress about Amination. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Quality Control of 1468-83-3.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Huang, Chun published the artcileI2/CuCl2-Copromoted Formal [4 + 1 + 1] Cyclization of Methyl Ketones, 2-Aminobenzonitriles and Ammonium Acetate: Direct Access to 2-Acyl-4-aminoquinazolines, Computed Properties of 1468-83-3, the main research area is aminoquinazolinyl aryl methanone preparation; aryl ethanone aminobenzonitrile ammonium acetate cyclization.

An I2/CuCl2-copromoted diamination of C(sp3)-H bonds for the preparation of 2-acyl-4-aminoquinazolines I [Ar = Ph, 1-naphthyl, 4-MeOC6H4, etc.; R = 8-Me, 6-Cl, 7-MeO, etc.] from Me ketones, 2-aminobenzonitriles, and ammonium acetate was reported. This reaction featured operational simplicity, com. available substrates, mild reaction conditions, and good functional group compatibility. Mechanistic studies indicated that CuCl2 played a pivotal role in this transformation. This study uses a Me group as a novel input to construct 2-acyl-4-aminoquinazoline derivatives for the first time.

Journal of Organic Chemistry published new progress about Amination. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Computed Properties of 1468-83-3.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Castellanos-Soriano, Jorge published the artcilePhotoredox catalysis powered by triplet fusion upconversion: arylation of heteroarenes, Related Products of benzothiophene, the main research area is furan thiophene arylation photoredox catalysis; Arylations; Furans; Photon upconversion; Photoredox catalysis; Thiophenes; Triplet fusion (triplet–triplet annihilation); Visible light.

In this work, the feasibility of triplet fusion upconversion (TFU, also named triplet-triplet annihilation upconversion) technol. for the functionalization (arylation) of furans and thiophenes has been successfully proven. Activation of aryl halides by TFU leads to generation of aryl radical intermediates; trapping of the latter by the corresponding heteroarenes, which act as nucleophiles, affords the final coupling products. Advantages of this photoredox catalytic method include the use of very mild conditions (visible light, standard conditions), employment of com. available reactants and low-loading metal-free photocatalysts, absence of any sacrificial agent (additive) in the medium and short irradiation times. The involvement of the high energetic delayed fluorescence in the reaction mechanism has been evidenced by quenching studies, whereas the two-photon nature of this photoredox arylation of furans and thiophenes has been manifested by the dependence on the energy source power. Finally, the scaling-up conditions have been gratifyingly afforded by a continuous-flow device.

Photochemical & Photobiological Sciences published new progress about Arylation. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Related Products of benzothiophene.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Tan, Ming published the artcileRoasting treatments affect physicochemical, aroma and nutritional quality of strong fragrant rapeseed oil, Related Products of benzothiophene, the main research area is roasting aroma nutritional quality rapeseed oil.

The strong fragrant rapeseed oil (SFRO) attracts the growing interest in China due to its fragrant flavor, attractive color, and phys. and oxidative stability. It is usually produced with simple processes including rapeseed roasting, mech. pressing, and degumming with hot water (80-90°C). To produce SFROs with high quality and nutritional contents, the seed roasting parameters including temperature up to 220°C and time ranging from 10 min to 30 min were investigated. Results showed that 20-min roasting at temperature 160°C resulted in the highest oil extraction yield of 33.20% with the lowest water content of 0.121%. The produced SFRO had the roasted, nutty and soft tastes with the maximum overall score, the highest total tocopherol and sterol contents of 789.73 mg/kg and 4582.80 mg/kg, resp., and high CoQ10 content of 65.57 mg/kg. Over-roasting at roasting temperature of over 180°C and time of over 30 min led to the high Lovibond red readings, off-flavors, and increased concentrations of high saturated fatty acids and Benzo[a]pyrene (BaP). Our findings would provide a reference to produce SFROs with the highest extraction yield and nutrient contents, acceptable physicochem. properties, optimal profile of the fatty acids and the key aroma compounds, and relatively-low BaP concentration

Journal of Food Composition and Analysis published new progress about Extraction. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Related Products of benzothiophene.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Huang, Jingjia published the artcileSynthesis of N-Alkylpyridin-4-ones and Thiazolo[3,2-a]pyridin-5-ones through Pummerer-Type Reactions, Formula: C6H6OS, the main research area is alkylpyridinone thiazolopyridinone preparation Pummerer.

N-Alkylated 4-pyridones were obtained through a one-pot procedure involving either normal or interrupted Pummerer reactions between triflic anhydride-activated sulfoxides and 4-fluoropyridine derivatives, followed by hydrolysis. However, triflic anhydride-activated benzyl 6-fluoro-2-pyridyl sulfoxide could react with alkenes or alkynes to afford thiazolo[3,2-a]pyridin-5-ones, via the pyridinium salt intermediates.

Journal of Organic Chemistry published new progress about Hydrolysis. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Formula: C6H6OS.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Cai, Yuxing published the artcileN-Heterocyclic Carbene-Catalyzed 1,4-Alkylacylation of 1,3-Enynes, Product Details of C6H6OS, the main research area is allenone preparation; enyne aldehyde radical precursor alkylacylation heterocyclic carbene catalyst.

The radical relay coupling reaction recently emerged as a powerful synthetic strategy for producing tetrasubstituted allenes R(R1CHR2)C=C=C(R3)C(O)R4 (R = H, Me; R1 = trifluoromethyl, 1,1-difluoro-2-methoxy-2-oxoethyl, 3-cyanopropyl, etc.; R2 = Me, Ph, thiophen-3-yl, pyridin-3-yl, etc.; R3 = hexyl, cyclopropyl, Ph, 4-(1,3-dioxo-2,3-dihydro-1H-isoindol-2-yl)butyl, etc.; R4 = Ph, furan-2-yl, pyridin-3-yl, etc.). However, bond-forming processes involving the allenyl radical intermediate are mostly limited to those promoted by transition metals. In this report, a ketyl radical generated from single-electron oxidation of the Breslow intermediate, which is an excellent coupling partner of allenyl radicals is described. An organocatalytic 1,4-alkylacylation of 1,3-enynes RCH=C(R2)CCR3 occurred smoothly in the presence of an aldehyde R4CHO, a radical precursor, and an N-heterocyclic carbene catalyst. This transformation showed remarkable tolerance to both aromatic and aliphatic aldehydes, enyne substitution, and diversified radical precursors.

Organic Letters published new progress about Acylation. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Product Details of C6H6OS.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem

Zhang, Bo published the artcileDiscovery of novel aminophosphonate derivatives containing pyrazole moiety as potential selective COX-2 inhibitors, Quality Control of 1468-83-3, the main research area is aminophosphonate preparation anticancer pyrazole inhibitor amidation human COX MSBAR; Aminophosphonate derivatives; Anti-cancer activity; Apoptosis induction; Cyclooxygenase 2; Mitochondrion-dependent pathway; Pyrazole moiety.

Cyclooxygenase is critical for maintaining physiol. functions, whereas overexpression of COX-2 was closely implicated in various cancers. In this study, a series of novel aminophosphonate derivatives containing pyrazole moiety were synthesized with their anti-cancer activity evaluated. In vitro assays of the target compounds showed that (I) displayed excellent COX-2 inhibitory activity against COX-2 (IC50 = 0.22 ± 0.04μM) and anti-proliferative activity against MCF-7 cell (IC50 = 4.37 ± 0.49μM). The apoptosis induction of compound I was confirmed by flow cytometry and polymerase chain reaction. Further investigation demonstrated that compound I induced apoptosis of MCF-7 cells through a mitochondrion-dependent pathway and involved cell-cycle arrest in G2 phase. Overall, these results provided some new insights into the design of therapeutic drugs for COX-2 inhibitors and indicated the connection between selective COX-2 inhibition and the anti-tumor activity.

Bioorganic Chemistry published new progress about Amidation. 1468-83-3 belongs to class benzothiophene, name is 3-Acetylthiophene, and the molecular formula is C6H6OS, Quality Control of 1468-83-3.

Referemce:
Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem