介绍了一种通过逐步钌催化的 C-H 芳基化和钾介导的还原性环化脱氢从 2-苯基吡啶和芳基溴化物合成二苯并 [f, h] 喹啉及其衍生物的方法。一种二苯并[ f , h ] 喹啉衍生物被用作双齿配体来制备环金属化的钌络合物。通过单晶 X 射线结构分析表征了两种二苯并 [ f , h ] 喹啉化合物和钌络合物。
Directing Group‐Promoted Inert C−O Bond Activation Using Versatile Boronic Acid as a Coupling Agent
作者:Ram Ambre、Ting‐Hsuan Wang、Anmei Xian、Yu‐Shiuan Chen、Yu‐Fu Liang、Titel Jurca、Lili Zhao、Tiow‐Gan Ong
DOI:10.1002/chem.202004132
日期:2020.12.18
strategy facilitates the efficient catalytic cross‐coupling of methoxyarenes with a variety of organoboronreagents. Directing groups facilitate the activation of inert C−O bonds in under‐utilized aryl methyl ethers enabling their adaptation for C−C cross‐coupling reactions as less toxic surrogates to the ubiquitous haloarenes. The method reported enables C−C cross‐coupling with readily available and economical
A mild approach for a Cp*Co(III)‐catalyzed C−H naphthylation of arenes by 7‐oxabicyclicalkenes has been developed. In some cases, intermediate products with a 1,2‐dihydronaphthalen‐1‐ol group have been isolated at room temperature in good yield. The catalytic reaction proceeds via C−H activation, insertion, β‐oxygen elimination, protonation, and dehydration, respectively. These simple protocols, featuring
The nickel-catalyzed decarbonylation of unstrained diaryl ketones has been developed. The reaction is catalyzed by a combination of Ni(cod)2 and an electron-rich N-heterocyclic carbene ligand. High functional group tolerance and excellent yields (up to 98%) are observed. This strategy provides an alternative and versatile approach to construct biaryls using an inexpensive nickel catalyst.
Rhodium(III)-Catalyzed Coupling of Arenes with 7-Oxa/Azabenzonorbornadienes by CH Activation
作者:Zisong Qi、Xingwei Li
DOI:10.1002/anie.201303507
日期:2013.8.19
Under chelation assistance, rhodium(III) complexes can catalyze the redox‐neutral coupling of arenes with 7‐oxabenzonorbornadienes and the oxidative coupling of arenes with 7‐azabenzonorbornadienes (see scheme; Cp*=C5Me5). A seven‐membered rhodacycle containing a RhC(alkyl) bond has been established as the key intermediate.
在螯合辅助下,铑(III)络合物可以催化芳烃与7-氧杂苯并降冰片二烯的氧化还原-中性偶联,以及芳烃与7-氮杂苯并降冰片二烯的氧化偶联(见方案; Cp * = C 5 Me 5)。含有RH的七元rhodacycle C(烷基)键已被确立为关键中间体。
PhI(OCOCF<sub>3</sub>)<sub>2</sub>-mediated ruthenium catalyzed highly site-selective direct ortho-C–H monoarylation of 2-phenylpyridine and 1-phenyl-1H-pyrazole and their derivatives by arylboronic acids
Direct ortho C–H monoarylation of 2-phenylpyridine and 1-phenyl-1H-pyrazole and its derivatives via a Ru catalysed reaction using catalytic amount of Phl(OCOCF3)2 as a hyper-valent iodine oxidant with arylboronic acids is presented.