Photoinduced
<scp>NaI‐Promoted</scp>
Radical Borylation of Alkyl Halides and Pseudohalides
作者:Chenglan Wang、Lu Zhou、Kai Yang、Feng Zhang、Qiuling Song
DOI:10.1002/cjoc.202100115
日期:2021.7
A method for photoinduced NaI-promoted radical borylation of aliphatic halides and pseudohalides with bis(catecholato)diboron (B2cat2) as the boron source is introduced. The borylation reaction is operationally simple and shows high functional group tolerance and broad substrate scope. Preliminary mechanistic studies suggest that the reaction proceeds through SN2-based radical-generation strategy.
介绍了一种以双(儿茶酚)二硼(B 2 cat 2 )为硼源的光诱导NaI促进的脂肪族卤化物和拟卤化物自由基硼化的方法。硼酸化反应操作简单,显示出高官能团耐受性和广泛的底物范围。初步机理研究表明,该反应通过基于S N 2 的自由基生成策略进行。
Palladium-Catalysed Cross-Coupling of Benzylammonium Salts with Boronic Acids under Mild Conditions
作者:Robert Phipps、Paul Türtscher、Holly Davis
DOI:10.1055/s-0036-1588548
日期:2018.2
pathway for the putative benzyl-Pd(II) intermediate obtained upon oxidative addition and have optimised this to obtain fluorene in good yield. Herein, we give a full account of the development of the palladium-catalysed cross-coupling of benzylammonium salts with boronic acids. A range of benzylamine-derived quaternary ammonium salts can be coupled with boronic acids under relatively mild conditions
Suzuki–Miyaura biaryl and diarylmethane syntheses via the coupling of arylboronic acids with aryl and arylmethyl bromides are performed in water by means of two new CNC-type palladium pincer complexes. Good to excellent results (including high TON values and extended recycling procedures) are obtained in most cases for a range of electronically dissimilar halides and boronic acids. On the basis of
A novel ether/BF3 reductive system has been described, in which diphenylmethanols and their ether and ester derivatives are used as starting materials. Reductions are performed in ether under reflux and an argon atmosphere, and the addition of extra water is beneficial to this reduction. A series of alkanes are able to be prepared with good to excellent yields. A deuterated experiment exhibits that
Cross coupling of benzylammonium salts with boronic acids using a well-defined N-heterocyclic carbene–palladium(<scp>ii</scp>) precatalyst
作者:Tao Wang、Jiarui Guo、Xiaojuan Wang、Han Guo、Dingli Jia、Hengjin Wang、Lantao Liu
DOI:10.1039/c8ra10439e
日期:——
N-heterocyclic carbene–palladium(II)-catalyzed cross-coupling of benzylammonium salts with arylboronic acids for the synthesis of diarylmethane derivatives via C–Nbondactivation has been developed. Notably, in the presence of the easily prepared and bench-stable Pd-PEPPSI precatalyst, the Csp3–N bondactivation of the benzylammonium salt even proceeded smoothly in isopropanol at room temperature.
N-杂环卡宾-钯( II )催化苄基铵盐与芳基硼酸的交叉偶联,通过C-N键活化合成二芳基甲烷衍生物。值得注意的是,在易于制备且工作稳定的 Pd-PEPPSI 预催化剂存在下,苄基铵盐的 Csp 3 -N 键活化甚至在异丙醇中在室温下顺利进行。