Facile synthesis of 2-substituted benzo[<i>b</i>]furans and indoles by copper-catalyzed intramolecular cyclization of 2-alkynyl phenols and tosylanilines
CuCl and Cs2CO3 was employed to synthesize a variety of 2-substituted benzo[b]furans and indoles by an intramolecular cyclization of 2-alkynyl phenols and tosylanilines. This protocol features mild conditions, high yields and broad substrate scope, which makes it a practical method for the synthesis of 2-substituted benzo[b]furans and indoles.
催化量的 CuCl 和 Cs 2 CO 3用于通过 2-炔基酚和甲苯磺酰苯胺的分子内环化合成各种 2-取代的苯并[ b ]呋喃和吲哚。该方案条件温和、产率高、底物范围广,是合成2-取代苯并[ b ]呋喃和吲哚的实用方法。
A borylative cyclisation towards indole boronic esters
作者:Jianhui Huang、Simon J. F. Macdonald、Joseph P. A. Harrity
DOI:10.1039/c0cc03577g
日期:——
2-Alkynylaniline borylative cyclisations provide a direct means to access indole 3-boronic esters from simple precursors. The Pd-catalysed cyclisation can be merged with cross-coupling processes in the same reaction vessel, moreover, the products can be exploited in C–N bond forming reactions.
Rh(III)-Catalyzed Asymmetric Synthesis of Axially Chiral Biindolyls by Merging C–H Activation and Nucleophilic Cyclization
作者:Miaomiao Tian、Dachang Bai、Guangfan Zheng、Junbiao Chang、Xingwei Li
DOI:10.1021/jacs.9b04711
日期:2019.6.19
herein is the mild and highly enantioselective synthesis of 2,3'-biindolyls via underexplored integration of C-Hactivation and alkyne cyclization using a unified chiral Rh(III) catalyst. The reaction proceeded via initial C-Hactivation followed by alkyne cyclization. A chiral rhodacyclic intermediate has been isolated from stoichiometric C-Hactivation, which offers direct mechanistic insight.