Tag: M.W:200-300

Recommanded Product: 52287-51-1. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine, is researched, Molecular C8H7BrO2, CAS is 52287-51-1, about Selective Carbonyl-C(sp3) Bond Cleavage To Construct Ynamides, Ynoates, and Ynones by Photoredox Catalysis.

C-C bond cleavage/functionalization is synthetically valuable, and selective carbonyl-C(sp3) bond cleavage/alkynylation presents a new perspective in constructing ynamides, ynoates, and ynones. Reported here is the 1st alkoxyl-radical-enabled carbonyl-C(sp3) bond cleavage/alkynylation reaction by photoredox catalysis. The use of novel cyclic I(III) reagents are essential for β-carbonyl alkoxyl radical generation from β-carbonyl alcs., including alcs. with high redox potential (Epox>2.2 V vs. SCE in MeCN). β-Amide, β-ester, and β-ketone alcs. yield ynamides, ynoates, and ynones, resp., for the 1st time, with excellent regio- and chemoselectivity under mild reaction conditions.

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Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Dauksas, V.; Gaidelis, P.; Brukstus, A.; Petrauskas, O.; Udrenaite, E.; Gasperaviciene, G. researched the compound: 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine( cas:52287-51-1 ).Quality Control of 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine.They published the article 《Synthesis and antiinflammatory activity of 7-halo- (or -ethyl-)substituted 6-benzoyl- (or -cinnamoyl)-1,4-benzodioxanes》 about this compound( cas:52287-51-1 ) in Chemija. Keywords: acylation benzodioxane halo ethyl; benzoylbenzodioxane preparation antiinflammatory; cinnamoylbenzodioxane preparation antiinflammatory; antiinflammatory cinnamoylbenzodioxane benzoylbenzodioxane. We’ll tell you more about this compound (cas:52287-51-1).

Title compounds I (R = PhCO, PhCH:CHCO; X = Br, Cl, Et) were synthesized in 72-95% yield by acylating I (R = H; same X) with BzCl or PhCH:CHCOCl in the presence of anhydrous AlCl3. I (R = PhCO, X = Br) exhibits low toxicity and high antiinflammatory activity; other products are less active.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Application In Synthesis of 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine, is researched, Molecular C8H7BrO2, CAS is 52287-51-1, about Ex Situ Generation of Stoichiometric and Substoichiometric 12CO and 13CO and Its Efficient Incorporation in Palladium Catalyzed Aminocarbonylations. Author is Hermange, Philippe; Lindhardt, Anders T.; Taaning, Rolf H.; Bjerglund, Klaus; Lupp, Daniel; Skrydstrup, Troels.

A new technique for the ex situ generation of carbon monoxide (CO) and its efficient incorporation in palladium catalyzed carbonylation reactions was achieved using a simple sealed two-chamber system. The ex situ generation of CO was achieved by a palladium catalyzed decarbonylation of tertiary acid chlorides using a catalyst originating from Pd(dba)2 and P(tBu)3. Preliminary studies using pivaloyl chloride as the CO-precursor provided an alternative approach for the aminocarbonylation of 2-pyridyl tosylate derivatives using only 1.5 equiv of CO. Further design of the acid chloride CO-precursor led to the development of a new solid, stable, and easy to handle source of CO for chem. transformations. The synthesis of this CO-precursor also provided an entry point for the late installment of an isotopically carbon-labeled acid chloride for the subsequent release of gaseous [13C]CO. In combination with studies aimed toward application of CO as the limiting reagent, this method provided highly efficient palladium catalyzed aminocarbonylations with CO-incorporations up to 96%. The ex situ generated CO and the two-chamber system were tested in the synthesis of several compounds of pharmaceutical interest and all of them were labeled as their [13C]carbonyl counterparts in good to excellent yields based on limiting CO. Finally, palladium catalyzed decarbonylation at room temperature also allowed for a successful double carbonylation. This new protocol provides a facile and clean source of gaseous CO, which is safely handled and stored. Furthermore, since the CO is generated ex situ, excellent functional group tolerance is secured in the carbonylation chamber. Finally, CO is only generated and released in minute amounts, hence, eliminating the need for specialized equipment such as CO-detectors and equipment for running high pressure reactions.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Synthetic Route of C2O4Sn. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Tin(II) oxalate, is researched, Molecular C2O4Sn, CAS is 814-94-8, about Structures and electrochemical properties of Sn-Cl co-doped Li2MnO3 as positive materials for lithium ion batteries. Author is Wang, Fei; Zhai, Huan-huan; Wang, Du-dan; Li, Yu-peng; Chen, Kang-hua.

Pos. material Li2MnO3 shows the highest ratio of lithium to manganese among lithium-rich materials and exhibits the theor. capacity up to 458 mAh·g-1, making it one of the most promising cathode materials. However, this material has the intrinsic low elec. conductivity and poor cycle stability. In this paper, Li2MnO3, the lithium-rich pos. material, was prepared by sol-gel method using acetate as raw material and citric acid as a complexing agent. By using SnC2O4 as a tin source, Sn4+ instead of Mn4+ was introduced to obtain the materials with different doping amounts The resultant solution was evaporated at 80°C under vigorous stirring to get a viscous gel. Next, the resulting gel was dried at 120°C for 12 h. Finally, the gathered precursor was calcined at 600°C for 6 h under an air atm. to obtain the target material. It was found that the proper content of Sn4+ doping could increase the specific discharge capacity of the material, obtaining as high as 256.3 mAh·g-1 at low current, but had a detrimental influence on the rate performance. On this basis, SnCl2 was used for doping modification, and the Sn4+ and Cl- co-doping into Li2MnO3 revealed a better developed layered structure with high conductivity The intensity of super lattice peak formed between 2θ = 20° and 30° was increased by Cl-doping, indicating the ordered Li/Mn in the TM layer. Especially, this Sn-Cl co-doped Li2MnO3 sample delivered the relatively high specific discharge capacity of approx. 160 mAh·g-1 after 80 cycles at 20 mA·g-1. At the high c.d. of 400 mA·g-1, this material provided the specific discharge capacity of 116 mAh·g-1, which is about twice that of the undoped sample.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine( cas:52287-51-1 ) is researched.Quality Control of 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine.Gu, Hua; Xue, Yu; Hu, Faqi; Jian, Nannan; Lin, Kaiwen; Wu, Tao; Liu, Ximei; Xu, Jingkun; Lu, Baoyang published the article 《Design of twisted conjugated molecular systems towards stable multi-colored electrochromic polymers》 about this compound( cas:52287-51-1 ) in Dyes and Pigments. Keywords: design twisted conjugated system stable multi colored electrochromic polymer. Let’s learn more about this compound (cas:52287-51-1).

Promising advancement of conjugated polymers in electrochromic devices require to design high-performance electrochromic polymers with rich color conversion and long-term stability under cyclic elec. loads. Here we report a new strategy in developing multi-colored electrochromic polymers with good stability via twisted conjugated mol. engineering. A series of twisted hybrid precursors are synthesized by coupling ortho-alkylenedioxybenzenes with EDOT units, and their corresponding polymers are facilely electrosynthesized at relatively low polymerization potentials. The structure-property relationships of such ortho-alkylenedioxybenzene-EDOT hybrid precursors and polymers are systematically elucidated via DFT calculations, spectral, morphol., electrochem. and spectroelectrochem. anal., etc. We demonstrate that the dihedral angle between ortho-alkylenedioxybenzenes and EDOT moieties can substantially affect the electrochem. and electrochromic properties of polymers. As the dihedral angle and electron cloud d. increases, these hybrid polymers display distinct multiple color switching nature and good overall performance including high coloration efficiency (>200 cm2 C-1), decent optical contrast (>45%), fast switching (<1 s), and excellent switching stability (96% of optical contrast after 3500 cycling) under cyclic elec. loads. With these findings, this work will provide novel insights for rational design of stable and highly efficient multi-colored electrochromic polymers. There is still a lot of research devoted to this compound(SMILES：BrC1=CC=C2OCCOC2=C1)Quality Control of 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine, and with the development of science, more effects of this compound(52287-51-1) can be discovered.

Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Chiral biphenyl diphosphines for asymmetric catalysis: stereoelectronic design and industrial perspectives, published in 2004-04-20, which mentions a compound: 52287-51-1, mainly applied to chiral biphenyl diphosphine nonracemic preparation ligand asym hydrogenation; SYNPHOS nonracemic preparation; DIFLUORPHOS nonracemic preparation; enantioselectivity hydrogenation ruthenium bidentate diphosphine ligand steric electronic effect; mol structure hydridochlororuthenium complex methyl acetoacetate DIFLUORPHOS; bite angle calculated bidentate diphosphine ligand; carbonyl stretching frequency carbonylchlororhodium complex bidentate diphosphine ligand, Recommanded Product: 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine.

Both enantiomers of the chiral diphosphines I (SYNPHOS) and II (DIFLUORPHOS) are prepared on multigram scales; the electronic and steric characteristics of I and II and of rhodium complexes derived from them are determined, compared with previous diphosphine catalysts, and correlated with their activities and enantioselectivities in the hydrogenation of ketones and olefins. I and II are prepared in five steps from 6-bromo-2,3-dihydro-1,4-benzodioxane and 5-bromo-2,2-difluorobenzodioxole, resp.; lithium-metal exchange and addition to a phosphoryl or phosphinyl chloride followed by oxidation to yield phosphine oxides, regioselective lithiation and iodination, Ullman coupling of the aryl iodides, resolution (either by acid-base resolution with di-O-benzoyl-tartaric acid or by chiral HPLC), and reduction of the phosphine oxides yields I and II in 38% and 33% overall yield, resp. The bite angles of I and II are compared to those of other common diphosphine ligands such as BINAP and MeO-BIPHEP. The structure of diastereomeric chlorohydridoruthenium complexes of (S)-II with Me acetoacetate is determined The C-O stretching frequencies of chloro(carbonyl)rhodium diphosphine complexes containing I, II, BINAP, and MeO-BIPHEP are determined as a measure of the electronic demands of the diphosphine ligands. β-Keto ester, α-keto ester, 1,3-diketone, ketone, and olefin substrates are hydrogenated in the presence of nonracemic I, II, BINAP, and MeO-BIPHEP and bis(η3-methallyl)(η4-1,5-cyclooctadienyl)ruthenium; the enantioselectivities are correlated with the steric and electronic properties of the ligands. The stereoelectronic features of the ligand and the substrate deeply influence the enantioselectivities obtained in asym. hydrogenation; whereas the steric and electronic factors for I (as in other diphosphines) correlate well, the bite angle of II does not correlate to its electronic effects in asym. hydrogenation reactions, leading to complementary hydrogenation selectivities for ligands I and II.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Humidity compensation based on power-law response for MOS sensors to VOCs, published in 2021-05-01, which mentions a compound: 814-94-8, Name is Tin(II) oxalate, Molecular C2O4Sn, Formula: C2O4Sn.

The compensation model for humidity is proposed for Metal oxide semiconductor (MOS) sensors to respond to volatile organic compounds (VOCs) vapor. There are four frequently-used sensors were investigated for the detection of three typical VOCs, namely, acetone, ethanol and methanol. In this study, water vapor was treated as a reactant involved in the response, then a model is proposed based on the power law response. As the resistance of sensor and humidity enter the model, the detected gas concentration will be output. The effect of model is well verified on the exptl. system. Even the model was applied to electronic nose to improve the recognition results. It indicates that our method is of great value to system that needs to remove the interference of water vapor.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Research Support, Non-U.S. Gov’t, Bioorganic & Medicinal Chemistry Letters called 5,5-Difluoro- and 5-Fluoro-5-methyl-hexose-based C-Glucosides as potent and orally bioavailable SGLT1 and SGLT2 dual inhibitors, Author is Xu, Guozhang; Du, Fuyong; Kuo, Gee-Hong; Xu, June Zhi; Liang, Yin; Demarest, Keith; Gaul, Michael D., which mentions a compound: 52287-51-1, SMILESS is BrC1=CC=C2OCCOC2=C1, Molecular C8H7BrO2, SDS of cas: 52287-51-1.

(2S,3R,4R,5S,6R)-2-Aryl-5,5-difluoro-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4-diols and (2S,3R,4R,5S,6R)-2-aryl-5-fluoro-5-methyl-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4-diols were discovered as dual inhibitors of sodium glucose co-transporter proteins (e.g. SGLT1 and SGLT2) through rational drug design, efficient synthesis, and in vitro and in vivo evaluation. Compound I demonstrated potent dual inhibitory activities (IC50 = 96 nM for SGLT1 and IC50 = 1.3 nM for SGLT2). It showed robust inhibition of blood glucose excursion in an oral glucose tolerance test (OGTT) in Sprague Dawley (SD) rats when dosed at both 1 mg/kg and 10 mg/kg orally. It also demonstrated postprandial glucose control in db/db mice when dosed orally at 10 mg/kg.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Korsager, Signe; Taaning, Rolf H.; Skrydstrup, Troels published the article 《Effective Palladium-Catalyzed Hydroxycarbonylation of Aryl Halides with Substoichiometric Carbon Monoxide》. Keywords: palladium catalyst hydroxycarbonylation aryl halide substoichiometric carbon monoxide; aromatic carboxylic acid preparation.They researched the compound: 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine( cas:52287-51-1 ).Formula: C8H7BrO2. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:52287-51-1) here.

A protocol for the Pd-catalyzed hydroxycarbonylation of aryl iodides, bromides, and chlorides has been developed using only 1-5 mol % of CO, corresponding to a pCO as low as 0.1 bar. Potassium formate is the only stoichiometric reagent, acting as a mildly basic nucleophile and a reservoir of CO. The substoichiometric CO could be delivered to the reaction from an acyl-Pd(II) precatalyst, which provides both the CO and an active catalyst, and thereby obviates the need for handling a toxic gas.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics

Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 52287-51-1, is researched, SMILESS is BrC1=CC=C2OCCOC2=C1, Molecular C8H7BrO2Journal, Article, Research Support, Non-U.S. Gov’t, Journal of Medicinal Chemistry called Discovering High Potent Hsp90 Inhibitors as Antinasopharyngeal Carcinoma Agents through Fragment Assembling Approach, Author is Xu, Mengyang; Zhao, Chao; Zhu, Biying; Wang, Liangyue; Zhou, Huihao; Yan, Daoguang; Gu, Qiong; Xu, Jun, the main research direction is nasopharyngeal carcinoma Hsp90 inhibitor fragments chemotypes click chem.Quality Control of 6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine.

Hsp90 is a new promising target for cancer treatment. Many inhibitors have been discovered as therapeutic agents, and some have passed Phase I and II. However, no one is approved by FDA yet. Novel and druggable Hsp90 inhibitors are still demanding. Here, we report a new way to discover high potent Hsp90 inhibitors as antinasopharyngeal carcinoma agents through assembling fragments. With chemotyping anal., we extract seven chemotypes from 3482 known Hsp90 inhibitors, screen 500 fragments that are compatible with the chemotypes, and confirm 15 anti-Hsp90 fragments. Click chem. is employed to construct 172 mols. and synthesize 21 compounds among them. The best inhibitor 3d was further optimized and resulted in more potent 4f(I) (IC50 = 0.16μM). In vitro and in vivo experiments confirmed that 4f is a promising agent against nasopharyngeal carcinoma. This study may provide a strategy in discovering new ligands against targets without well-understood structures.

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Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics