Unactivated olefins usually react poorly in conventional alkenylation reactions. Their introduction via C-H activation is limited to aromatic acids. Herein, we disclose a C-H functionalization protocol of aromatic amines with unactivated olefins, which shows exclusive allylic selectivity for the distal ring of the biphenyl system by exploiting a readily available cobalt(II) catalyst. The allylation
Bottom-up Construction of π-Extended Arenes by a Palladium-Catalyzed Annulative Dimerization of <i>o</i>
-Iodobiaryl Compounds
作者:Chendan Zhu、Di Wang、Dingyi Wang、Yue Zhao、Wei-Yin Sun、Zhuangzhi Shi
DOI:10.1002/anie.201803603
日期:2018.7.16
construction of aromatic compounds with a triphenylene core. The method involves Pd‐catalyzed annulative dimerization of o‐iodobiaryl compounds by double C−I and C−H bond cleavage steps. Simple reaction conditions are needed, requiring neither a ligand nor an oxidant, and the reaction tolerates a wide range of coupling partners without compromising efficiency or scalability. Significantly, the tetrachloro‐substituted
Silver‐catalyzed Radical Cascade Arylthiodifluoromethylation/ Cyclization of Isonitriles for the Synthesis of 6‐Phenanthridinyldifluoromethyl Aryl Thioethers
A radicalisonitrile insertion cascade reaction was studied to synthesis of 6-phenanthridinyldifluoromethyl aryl thioethers via oxidative decarboxylation of arylthiodifluoroacetic salt process under silver-catalyzed conditions.
The core of the perylenequinone-derived mycotoxin altertoxin I was synthesized either from 3-hydroxyacetophenone or from 1,5-dihydroxynaphthalene, where Suzuki couplings, Ullmann couplings, McMurry olefinations, and Friedel-Crafts acetylation were key steps in the respective syntheses.
As the tile reaction shows, an array of dibenzocarbazoles were obtained via dual C–H functionalization of indoles with cyclic diaryliodoniums in a single operation.