Month: October 2022

Meazza, Marta; Sitinova, Gabriela; Poderi, Cecilia; Mancinelli, Michele; Zhang, Kaiheng; Mazzanti, Andrea; Torres, Ramon Rios published the artcile< Synergistic Catalysis: Highly Enantioselective Acetyl Aza-arene Addition to Enals>, Application In Synthesis of 3893-18-3, the main research area is synergistic catalysis enantioselective addition acetyl aza arene enal; Michael addition; acetyl aza-arenes; enals; secondary amine catalysis; synergistic catalysis.

A novel catalytic enantioselective methodol. based on synergistic catalysis for the synthesis of chiral 2-acyl pyridines and pyrazines is reported. The strategy involves the metal-Lewis acid activation of acetyl aza-arenes and the secondary-amine activation of enals. The proposed mechanism is supported by DFT calculations

Chemistry – A European Journal published new progress about Addition reaction, stereoselective. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Application In Synthesis of 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhang, Kaiheng; Sheng, Xiang; Deiana, Luca; Svensson Grape, Erik; Ken Inge, A.; Himo, Fahmi; Cordova, Armando published the artcile< Solvent Dependency in Stereoselective δ-Lactam Formation of Chiral α-Fluoromalonate Derivatives: Stereodivergent Synthesis of Heterocycles with Fluorine Containing Stereocenters Adjacent to Tertiary Stereocenters>, SDS of cas: 3893-18-3, the main research area is bicyclic lactam stereoselective preparation.

The discovery and investigation of solvent dependency in stereoselective intramol. amidation of chiral 5-aminofunctionalized-2-fluoromalonate ester derivatives, which gave access to highly functionalized δ-lactams with a quaternary fluorine-containing stereocenter was disclosed. Exptl. work together with d. functional theory calculations led to understanding of how to direct and switch the stereochem. outcome of the stereoselective δ-lactam formation. The merging of this solvent-dependent stereoselective switch with asym. catalysis and cascade reactions gave access to an unprecedented strategy for stereodivergent synthesis of all possible stereoisomers of fluorine-containing stereocenters adjacent to tertiary stereocenters of a wide range of heterocyclic compounds with 95->99% ee in one-pot. It was also useful for application in total synthesis of fluorine-containing pharmaceuticals.

Advanced Synthesis & Catalysis published new progress about Amidation (intramol.). 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, SDS of cas: 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wang, Feijun; Zhang, Yong Jian; Yang, Guoqiang; Zhang, Wanbin published the artcile< Highly enantioselective Pd(II)-catalyzed Wacker-type cyclization of 2-allylphenols by use of bisoxazoline ligands with axis-unfixed biphenyl backbone>, Formula: C9H9BrO3, the main research area is oxazoline biphenyl ligand preparation catalyst asym Wacker cyclization; allylphenol asym Wacker cyclization oxazolinylbiphenyl palladium catalyst; benzofuran dihydro asym synthesis.

A series of axis-unfixed bisoxazoline ligands with different steric and electronic properties was synthesized. Due to the different steric interactions, the ligands afforded only one of the two possible diastereomeric Pd(II)-complexes upon metal coordination. The Pd(II) complex of (S,aS)-2,2′-dioxazolin-2-ylbiphenyl I showed excellent catalytic activities and enantioselectivities in Wacker-type cyclization of allylphenols with ≤98% ee.

Tetrahedron Letters published new progress about Allylic compounds Role: RCT (Reactant), RACT (Reactant or Reagent). 17100-65-1 belongs to class bromides-buliding-blocks, and the molecular formula is C9H9BrO3, Formula: C9H9BrO3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Rajput, Santosh; Gardner, Christopher R.; Failes, Timothy W.; Arndt, Greg M.; Black, David StC.; Kumar, Naresh published the artcile< Synthesis and anticancer evaluation of 3-substituted quinolin-4-ones and 2,3-dihydroquinolin-4-ones>, Quality Control of 14062-30-7, the main research area is antitumor quinolinone dihydroquinolinone preparation; Anticancer; Dihydroquinolin-4-one; Quinolin-4-one.

A series of 3-aryl-5,7-dimethoxyquinolin-4-ones I [R1 = Ph, 4-BrC6H4, 4-MeC6H4, etc.] and 3-aryl-5,7-dimethoxy-2,3-dihydroquinolin-4-ones II [ R2 = Ph, 4-BrC6H4, 4-MeC6H4, etc.] were synthesized in good yields. Demethylation under a range of conditions afforded the corresponding 5-hydroxy and 5,7-dihydroxy derivatives Biol. evaluation against a range of cancer cells lines showed that the quinolin-4-one scaffold was more cytotoxic than the reduced 2,3-dihydroquinolin-4-one scaffold. The most active monohydroxy compound demonstrated 85.9-99% reduction in cell viability against the cell lines tested.

Bioorganic & Medicinal Chemistry published new progress about Antitumor agents. 14062-30-7 belongs to class bromides-buliding-blocks, and the molecular formula is C10H11BrO2, Quality Control of 14062-30-7.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Chen, Tiffany Q.; Pedersen, P. Scott; Dow, Nathan W.; Fayad, Remi; Hauke, Cory E.; Rosko, Michael C.; Danilov, Evgeny O.; Blakemore, David C.; Dechert-Schmitt, Anne-Marie; Knauber, Thomas; Castellano, Felix N.; MacMillan, David W. C. published the artcile< Unified Approach to Decarboxylative Halogenation of (Hetero)aryl Carboxylic Acids>, HPLC of Formula: 401-78-5, the main research area is hetero aryl halide preparation photochem; aryl hetero carboxylic acid decarboxylative halogenation copper catalyst.

A general catalytic method for direct decarboxylative halogenation of (hetero)aryl carboxylic acids RC(O)OH (R = 4-sulfamoylphenyl, 5-methylpyridin-2-yl, isoquinolin-1-yl, etc.) via ligand-to-metal charge transfer was reported. This strategy accommodates an exceptionally broad scope of substrates. An aryl radical intermediate is leveraged toward divergent functionalization pathways: (1) atom transfer to access bromo- or iodo(hetero)arenes or (2) radical capture by copper and subsequent reductive elimination to generate chloro- or fluoro(hetero)arenes. The proposed ligand-to-metal charge transfer mechanism is supported through an array of spectroscopic studies.

Journal of the American Chemical Society published new progress about Aromatic carboxylic acids Role: RCT (Reactant), RACT (Reactant or Reagent). 401-78-5 belongs to class bromides-buliding-blocks, and the molecular formula is C7H4BrF3, HPLC of Formula: 401-78-5.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Malig, Thomas C.; Kumar, Archana; Kurita, Kenji L. published the artcile< Online and In Situ Monitoring of the Exchange, Transmetalation, and Cross-Coupling of a Negishi Reaction>, HPLC of Formula: 401-78-5, the main research area is exchange transmetalation Cross Coupling Negishi reaction; Online and In Situ Monitoring Negishi reaction.

We have developed a reaction monitoring method which provides quant. information through exchange, transmetalation (TM), and cross-coupling for a Negishi reaction. Online HPLC and ReactIR were used as orthogonal techniques to corroborate time-course data through each step. Excellent agreement between the two techniques was observed through monitoring the magnesium/bromine exchange. Quant. information regarding the TM was gathered via a novel, inline quenching technique facilitated by online HPLC. Quenching reaction aliquots with the electrophile 4-chlorobenzaldehyde allowed us to determine the extent of TM because of its selectivity for reacting with organomagnesiums. After TM, the Negishi reaction was performed and monitored using online LC. Titrating ZnCl2 into a solution of arylmagnesium allowed us to gain insights into zinc speciation in situ. Less than 1 equiv of ZnCl2 was needed to achieve complete TM, evidencing the presence of diorganozincs/arylzincates. Addnl., using substoichiometric quantities of ZnCl2 resulted in higher rates of catalysis for the Negishi reaction.

Organic Process Research & Development published new progress about Negishi coupling reaction. 401-78-5 belongs to class bromides-buliding-blocks, and the molecular formula is C7H4BrF3, HPLC of Formula: 401-78-5.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

He, Haiping; Duan, Dehao; Li, Hong; Wei, Yifei; Nie, Liang; Tang, Bo; Wang, Hanyu; Han, Xiaowei; Huang, Panpan; Peng, Xiangjun published the artcile< Graphene oxide-catalyzed synthesis of benzothiazoles with amines and elemental sulfur via oxidative coupling strategy of amines to imines>, Name: 4-Bromobenzylamine, the main research area is benzothiazole green regioselective preparation; amine naphthalene elemental sulfur graphene oxide catalyst oxidative coupling.

The graphene oxide-catalyzed coupling and cyclization reactions of primary amines with elemental sulfur was developed to afford optically property benzothiazoles I [R = Ph, 4-MeC6H4, 2-F3C6H4, etc.], II [R1 = H, 3-CF3, 4-Me, etc.] and III [R1 = H, 2-CF3, 4-Cl, etc.; R2 = H, 6-Cl, 6-OMe, etc.]. This coupling and cyclization strategies proceeded under the oxidant system graphene oxide/O2 and constructed carbon-heteroatom (N, S) bonds with amines and elemental sulfur. Due to benzothiazoles as common chromophores, these products exhibited intriguing fluorescence properties, including outstanding Stokes shifts (up to 161 nm) and quantum yields (up to 74%). Utilizing the products’ unique fluorescence response in different solvents, β-naphthothiazole II [R1 = H] showed excellent aggregation-induced emission properties in 1,2-dichloroethane, which was 60 times higher than in THF.

Tetrahedron published new progress about Benzothiazoles Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 3959-07-7 belongs to class bromides-buliding-blocks, and the molecular formula is C7H8BrN, Name: 4-Bromobenzylamine.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhang, Yong; Wei, Biaowen; Lin, Hui; Cui, Weirong; Zeng, Xianqiang; Fan, Xiaolin published the artcile< Organocatalyzed Asymmetric Vinylogous Michael Reactions of 3,5-Dialkyl-Substituted 4-Nitroisoxazoles: A Direct Method for the Synthesis of Chiral Isoxazole Derivatives>, Computed Properties of 3893-18-3, the main research area is isoxazole preparation enantioselective; aldehyde unsaturated nitroisoxazole vinylogous Michael addition organocatalyst.

A direct method for the synthesis of chiral isoxazole derivatives I (R = 3-BrC6H4, naphth-1-yl, 2-thienyl, etc.) via asym. vinylogous Michael addition of 3,5-dialkyl-substituted 4-nitroisoxazoles with α,β-unsaturated aldehydes catalyzed by a diphenylprolinol TBS ether organocatalyst is described. This approach provides an easy access to highly functionalized chiral isoxazole derivatives with moderate to good yields and up to excellent enantioselectivities (96% ee).

Advanced Synthesis & Catalysis published new progress about Acetals Role: SPN (Synthetic Preparation), PREP (Preparation). 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Computed Properties of 3893-18-3.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Shahzadi, Tayyaba; Saleem, Rahman S. Z.; Chotana, Ghayoor A. published the artcile< Facile Synthesis of Halogen Decorated para-/meta-Hydroxybenzoates by Iridium-Catalyzed Borylation and Oxidation>, Formula: C8H6BrFO2, the main research area is para meta hydroxybenzoate preparation; benzoate ester boronic ester borylation oxidation iridium catalyst.

In this report, a facile preparation of 2,6- and 2,3-disubstituted 4/5-hydroxybenzoates by iridium-catalyzed borylation of resp. disubstituted benzoate esters followed by oxidation is described. This synthetic route allows for the incorporation of halogens in the final hydroxybenzoates with substitution patterns not readily accessible by the traditional routes of aromatic functionalization.

Synthesis published new progress about Aromatic esters Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 6942-39-8 belongs to class bromides-buliding-blocks, and the molecular formula is C8H6BrFO2, Formula: C8H6BrFO2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhou, Yangyang; Chen, Chen; Li, Qiling; Liu, Yanbo; Wei, Ting; Liu, Youzhen; Zeng, Zebing; Bradshaw, Darren; Zhang, Bing; Huo, Jia published the artcile< Precise control of selective hydrogenation of α,β-unsaturated aldehydes in water mediated by ammonia borane>, Product Details of C9H7BrO, the main research area is unsaturated aldehyde selective hydrogenation ammonia borane catalyst.

Hydrogenation of unsaturated biomass in a control manner is highly desirable but challenging, especially under mild conditions. We here report selective hydrogenation of α,β-unsaturated aldehydes (UALs), featuring a precise control of all potential products by adjustment of the role of ammonia borane (AB) in transfer and/or catalytic hydrogenation. The hydrogenation can be readily operated in neat water without using any external H2-source, because AB as the H2-source is favorable in aqueous solution Impressively, unsaturated alcs. are prepared in 100% conversion by the room-temperature transfer hydrogenation of UALs with AB, while saturated aldehydes are obtained in 100% conversion and > 90% selectivity with high activity (i.e., turnover frequency = 0.98 s-1 for cinnamaldehyde), by the catalytic hydrogenation with H2 released from AB and Pd immobilized on two-dimensional metal organic layer. On the other hand, UALs can be completely converted into the saturated alcs. through a combination of transfer and catalytic hydrogenation in one pot. This strategy can be extended to more than 8 types of UALs, and provides a facile way to fine-control the selective hydrogenation of unsaturated compounds with competing bonds.

Applied Catalysis, B: Environmental published new progress about 3893-18-3. 3893-18-3 belongs to class bromides-buliding-blocks, and the molecular formula is C9H7BrO, Product Details of C9H7BrO.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary