Magnesium salt promoted tandem nucleophilic addition–Oppenauer oxidation of aldehydes with organozinc reagents
作者:Ying Fu、Xing Ling Zhao、Hulmet Hügel、Danfeng Huang、Zhengyin Du、Kehu Wang、Yulai Hu
DOI:10.1039/c6ob01668e
日期:——
A magnesium salt promoted synthesis of ketones via tandem nucleophilic addition–Oppenauer oxidation of aldehydes using organozinc chemistry was demonstrated. Magnesium salts concomitantly generated via magnesium metal mediated organohalide zincation exhibit high efficacy for nucleophilic addition of organozinc reagents to aromatic aldehydes and thereafter Oppenauer oxidation whereby ketones are formed
Reversed-Polarity Synthesis of Diaryl Ketones through Palladium-Catalyzed Direct Arylation of 2-Aryl-1,3-dithianes
作者:Baris Yucel、Patrick J. Walsh
DOI:10.1002/adsc.201400695
日期:2014.11.24
resulting 2,2-diaryl-1,3-dithianes were converted into diaryl ketones by either molecular iodine, N-bromo succinimide (NBS) or Selectfluor in the presence of water. The dithiane arylation/hydrolysis can be performed in a one-pot procedure to yield a good to excellent yields. This method is suitable for rapid and large-scale synthesis of diaryl ketones. A one-pot preparation of anti-cholesterol drug fenofibrate
The Halogen–Samarium Exchange Reaction: Synthetic Applications and Kinetics
作者:Lucile Anthore‐Dalion、Andreas D. Benischke、Baosheng Wei、Guillaume Berionni、Paul Knochel
DOI:10.1002/anie.201814373
日期:2019.3.18
Fast I/Sm and Br/Sm exchanges take place when various aromatic or heterocyclic iodides and bromides are treated with nBu2SmCl⋅4 LiCl and nBu3Sm⋅5 LiCl, respectively. The resulting organosamarium reagents were efficiently quenched with aldehydes, ketones, and imines. Also, they undergo acylations when treated with N,N‐dimethylamides leading to ketones. The rate of the Br/Sm exchange for a typical aryl
当分别用n Bu 2 SmCl·4 LiCl和n Bu 3 Sm·5 LiCl处理各种芳族或杂环碘化物和溴化物时,会发生快速的I / Sm和Br / Sm交换。将所得有机sa试剂有效地用醛,酮和亚胺淬灭。同样,当用N,N-二甲基酰胺处理时,它们会发生酰化反应,生成酮。确定了典型的芳基溴的Br / Sm交换速率,发现其比Br / Mg交换快8.5×10 5,这表明金属交换速率与碳的离子特性有关。金属键和对金属的电负性。
Reversed-Polarity Synthesis of Diaryl Ketones via Palladium-Catalyzed Cross-Coupling of Acylsilanes
作者:Jason R. Schmink、Shane W. Krska
DOI:10.1021/ja2064318
日期:2011.12.14
Acylsilanes serve as acylanion equivalents in a palladium-catalyzed cross-coupling reaction with aryl bromides to give unsymmetrical diaryl ketones. Water plays a unique and crucial activating role in these reactions. High-throughput experimentation techniques provided successful reaction conditions initially involving phosphites as ligands. Ultimately, 1,3,5,7-tetramethyl-6-phenyl-2,4,8-trioxa-6-phosphaadamantane