1218-88-8Relevant articles and documents
Dirhodium-Catalyzed Enantioselective B?H Bond Insertion of gem-Diaryl Carbenes: Efficient Access to gem-Diarylmethine Boranes
Huang, Ming-Yao,Li, Xiao-Yu,Su, Yu-Xuan,Yang, Liang-Liang,Zhao, Yu-Tao,Zhu, Shou-Fei
supporting information, p. 24214 - 24219 (2021/10/07)
The scarcity of reliable methods for synthesizing chiral gem-diarylmethine borons limits their applications. Herein, we report a method for highly enantioselective dirhodium-catalyzed B?H bond insertion reactions with diaryl diazomethanes as carbene precursors. These reactions afforded chiral gem-diarylmethine borane compounds in high yield (up to 99 % yield), high activity (turnover numbers up to 14 300), high enantioselectivity (up to 99 % ee) and showed unprecedented broad functional group tolerance. The borane compounds synthesized by this method could be efficiently transformed into diaryl methanol, diaryl methyl amine, and triaryl methane derivatives with good stereospecificity. Mechanistic studies suggested that the borane adduct coordinated to the rhodium catalyst and thus interfered with decomposition of the diazomethane, and that insertion of a rhodium carbene (generated from the diaryl diazomethane) into the B?H bond was most likely the rate-determining step.
Aerobic oxidative acylation of nitroarenes with arylacetic esters under mild conditions: Facile access to diarylketones
Li, Jiang-Sheng,Yang, Qian,Yang, Fan,Chen, Guo-Qin,Li, Zhi-Wei,Kuang, Yin-Jie,Zhang, Wei-Jing,Huang, Peng-Mian
, p. 140 - 145 (2017/12/27)
A facile and regioselective base-mediated aerobic oxidative acylation of nitroarenes to access diarylketones under mild conditions has been developed. It features the use of bench-stable and readily available arylacetates as acyl surrogates, and the absence of transition-metals and synthetic oxidants. This protocol involves a cascade CDC/oxidative decarboxylation process.
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%.
