The Rh(I)-catalyzed direct reorganization of organic frameworks and group exchanges between carboxylic acids and aryl ketones was developed with the assistance of directinggroup. Biaryls, alkenylarenes, and alkylarenes were produced in high efficiency from aryl ketones and the corresponding carboxylic acids by releasing the other molecule of carboxylic acids and carbon monoxide. A wide range of functional
unprecedented dual photoredox/palladium-catalyzed iminyl-radical-mediated C–C bond cleavage and directed ortho C–H acylation of 2-arylpyridines by using oxime esters is described. Oxime esters can serve as efficient acyl sources through formation of the corresponding acylradicals by photoredox-catalyzed iminyl-radical-mediated C–C bond cleavage. This redox-neutral protocol features excellent regioselectivity
Rh(III)‐Catalyzed Regioselective Acetylation of sp
<sup>2</sup>
C−H Bond Starting from Paraformaldehyde
作者:Ting Wan、Sidong Du、Chao Pi、Yong Wang、Rongbin Li、Yangjie Wu、Xiuling Cui
DOI:10.1002/cctc.201801512
日期:2019.8.21
Rh(III)‐catalyzedacetylation of sp2 C−H bonds has been realized using paraformaldehyde as an acetylating reagent. This procedure features simultaneous formation of two C−C bonds, external oxidants free, and water as the sole byproducts, thus offering an environmentally benign acetylation of arenes. A range of functional groups tolerance were observed.
Unexpected Pyridinyl Group Mediated Metal-Free Wacker-Type Oxidation en Route to Pyrido[2,1-a]isoindol-5-ium Salts
作者:Yandong Zhang、Dong Shi、Tao Zeng、Xin Lei、Xiaotong Wu、Mansirun Li
DOI:10.1055/a-1938-2521
日期:2022.12
A two-step approach to rapidly access a diverse array of pyrido[2,1-a]isoindol-5-ium salts from 2-pyridinylstyrenes through an unprecedented pyridinyl group mediated metal-free Wacker-type oxidation and an acid-mediated cyclization has been developed. As a part of the mechanistic investigation of this novel Wacker-type oxidation, the abnormal instability and reactivity of the pyrido[2,1-a]isoindole
通过前所未有的吡啶基介导的无金属瓦克型氧化和酸介导的环化,从 2-吡啶基苯乙烯快速获得多种吡啶并[2,1- a ]异吲哚-5-鎓盐的两步法已经被开发。作为这种新型 Wacker 型氧化的机理研究的一部分,通过 DFT 计算研究了吡啶并[2,1- a ] 异吲哚中间体的异常不稳定性和反应性。