41204-59-5Relevant academic research and scientific papers
Photo-induced oxidative cleavage of C-C double bonds for the synthesis of biaryl methanoneviaCeCl3catalysis
Xie, Pan,Xue, Cheng,Du, Dongdong,Shi, SanShan
supporting information, p. 6781 - 6785 (2021/08/20)
A Ce-catalyzed strategy is developed to produce biaryl methanonesviaphotooxidative cleavage of C-C double bonds at room temperature. This reaction is performed under air and demonstrates high activity as well as functional group tolerance. A synergistic Ce/ROH catalytic mechanism is also proposed based on the experimental observations. This protocol should be the first successful Ce-catalyzed photooxidation reaction of olefins with air as the oxidant, which would provide inspiration for the development of novel Ce-catalyzed photochemical synthesis processes.
Chiral electron-rich PNP ligand with a phospholane motif: Structural features and application in asymmetric hydrogenation
Wang, Heng,Zhang, Yao,Yang, Tilong,Guo, Xiaochong,Gong, Quan,Wen, Jialin,Zhang, Xumu
, p. 8796 - 8801 (2020/11/13)
Despite the remarkable reactivity that was achieved by a series of transition-metal catalysts with a PNP type ligand, the electron-rich chiral PNP ligands have still been rarely reported because of the difficulties in synthesis and the nature of air-sensitivity. Herein, we report a novel chiral PNP ligand (Heng-PNP) with both a rigid backbone and a bulky tert-butyl group on the phospholane motif. We successfully obtained its divalent iron complex. The chiral environment of its Ir(III) complex was also discussed with quadrant analysis. This tridentate ligand was applied in iridium-catalyzed asymmetric hydrogenation of challenging diaryl ketones: up to 98% ee and 500 TON are achieved. Computational study showed that the twist of conjugate aryl group in the substrate (induced by the special chiral pocket of Ir/Heng-PNP complex) leads to the energy difference in the enantiodetermining step.
Silylcarboxylic Acids as Bifunctional Reagents: Application in Palladium-Catalyzed External-CO-Free Carbonylative Cross-Coupling Reactions
Li, Xiong,Xu, Jie,Li, Yue,Kramer, S?ren,Skrydstrup, Troels,Lian, Zhong
, p. 4078 - 4083 (2020/07/30)
A palladium-catalyzed external-CO-free carbonylative Hiyama-Denmark cross-coupling reaction is presented. The introduction of silylcarboxylic acids as bifunctional reagents (CO and nucleophile source) avoids the need for external gaseous CO and a silylarene coupling partner. The transformation features high functional group tolerance and it is successful with electron-rich, -neutral, and -poor aryl iodides. Stoichiometric studies and control experiments provide insight into the reaction mechanism and support the hypothesized dual role of silylcarboxylic acids. (Figure presented.).
Kinetically Controlled, Highly Chemoselective Acylation of Functionalized Grignard Reagents with Amides by N?C Cleavage
Li, Guangchen,Szostak, Michal
supporting information, p. 611 - 615 (2020/01/02)
The direct transition-metal-free acylation of amides with functionalized Grignard reagents by highly chemoselective N?C cleavage under kinetic control has been accomplished. The method offers rapid and convergent access to functionalized biaryl ketones through transient tetrahedral intermediates. The direct access to functionalized Grignard reagents by in situ halogen–magnesium exchange promoted by the versatile turbo-Grignard reagent (iPrMgCl?LiCl) permits excellent substrate scope with respect to both the amide and Grignard coupling partners. These reactions enable facile, operationally simple and chemoselective access to tetrahedral intermediates from amides under significantly milder conditions than chelation-controlled intermediates. This novel direct two-component coupling sets the stage for using amides as acylating reagents in an alternative paradigm to the metal-chelated approach, acyl metals and Weinreb amides.
Arylation of Aldehydes to Directly Form Ketones via Tandem Nickel Catalysis
Lei, Chuanhu,Zhu, Daoyong,Tangcueco, Vicente Iii Tiu,Zhou, Jianrong Steve
supporting information, p. 5817 - 5822 (2019/08/26)
A nickel-catalyzed arylation of both aliphatic and aromatic aldehydes proceeds with air-stable (hetero)arylboronic acids, with an exceptionally wide substrate scope. The neutral condition tolerates acidic hydrogen and sensitive polar groups and also preserves α-stereocenters of some chiral aldehydes. Interestingly, this nickel(0) catalysis does not follow common 1,2-insertion of arylmetal species to aldehydes and β-hydrogen elimination.
Synthetic method of ketone compounds
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Paragraph 0070-0074, (2018/11/22)
The invention belongs to the field of organic synthesis, and particularly relates to a synthetic method of ketone compounds. The invention provides a synthetic method of the ketone compounds. In the presence of a silver catalyst and alkaline additive, hydrazine and carbonyl carboxylic acid are used as substrates to have oxidation reaction to generate the ketone compounds. In the synthetic method of the invention, the used substrates, catalyst and additive are easy to obtain, and the cost is low; meanwhile, the generated byproducts are nitrogen, water and carbon dioxide, so that the synthetic method is environmentally friendly, pollution-free, and capable of meeting the sustainable development concept; and thirdly, by adopting the preparation method, the pre-activation is not needed, the yield is greater than 60 percent or, and the synthetic efficiency is high; and the technical defects in the prior art that the synthesis method of the ketone compounds is complicated in synthetic procedures, high in catalyst price and difficult in synthesizing an active intermediate can be solved.
At normal pressure fragrant ketone copper catalytic synthesis method
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Paragraph 0032; 0033; 0038, (2017/07/14)
The invention discloses a method of synthesizing diaryl ketone under normal pressure by virtue of copper catalysis. The method is as follows: in a solvent alcohol or aqueous liquor of alcohol, under action of alkali and acid, adding a copper catalyst, alkyl iodide, alkyl boric acid and carbon monoxide to directly carry out crossed coupling reaction to prepare diaryl ketone compounds. According to the invention, the method of preparing diaryl ketone compounds by carbonylation Suzuki coupling reaction has the advantages as follows: the catalyst is wide in source, cheap and small in toxicity; the reaction is free of ligand in reaction and good in activity; the reaction is carried out under the normal pressure and selectivity is high; a substrate source is wide and stable; functional group compatibility is good and scope of application for the substrate is wide; a reaction medium is environment-friendly and recyclable. Under the condition of optimizing reaction conditions, the target product separating yield is 95%.
At normal pressure fragrant ketone nickel catalytic synthesis method
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Paragraph 0003; 0017; 0027-0033, (2017/08/02)
The invention discloses a method for synthesizing diarylketone under the catalysis of nickel at normal pressure. The method comprises the steps of enabling aryl iodide, arylboronic acid and carbon monoxide to be subjected to direct cross-coupling reaction in a solvent polyethylene glycol or a water solution of polyethylene glycol under the catalysis of a nickel catalyst and the combined action of alkaline and acid at normal pressure to prepare a diarylketone compound. The method has the advantages of wide catalyst source, low price, little toxicity, reaction at normal pressure, high selectivity, no need of ligands in reaction, good activity, good functional group compatibility, wide substrate application range, wide substrate source, stable substrate, green and recyclable reaction medium and the like. The separation yield of target products is up to 93% under an optimized reaction condition.
N-Acylsuccinimides: Efficient acylative coupling reagents in palladium-catalyzed Suzuki coupling via C–N cleavage
Cui, Ming,Chen, Zeyu,Liu, Tingting,Wang, Hui,Zeng, Zhuo
supporting information, p. 3819 - 3822 (2017/09/15)
An acylative Suzuki coupling of activated amides with aryl boronic acids has been reported via palladium-catalyzed C–N bond cleavage. This protocol demonstrate amides can be activated by an atom-economic and cheap succinimide, which can be efficiently utilized to synthesize broad array of diaryl ketones in moderate to good yields.
Ni-Catalyzed cross-coupling reactions of N-acylpyrrole-type amides with organoboron reagents
Huang, Pei-Qiang,Chen, Hang
supporting information, p. 12584 - 12587 (2017/11/30)
The catalytic conversion of amides to ketones is highly desirable yet challenging in organic synthesis. We herein report the first Ni/bis-NHC-catalyzed cross-coupling of N-acylpyrrole-type amides with arylboronic esters to obtain diarylketones. This method is facilitated by a new chelating bis-NHC ligand. The reaction tolerates diverse functional groups on both arylamide and arylboronic ester partners including sensitive ester and ketone groups.
