Copper-catalyzed construction of eight-membered rings via oxidative ring expansion and intermolecular cyclization sequencing of indoles with amidines: efficient synthesis of benzo[1,3,5]triazocin-6(5H)-ones
作者:Wen-Bin Cao、Xue-Qiang Chu、Yu Zhou、Ling Yin、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1039/c7cc02815f
日期:——
Novel and efficient synthesis of eight-membered nitrogen heterocycles in one pot by copper-catalyzed oxidative ring expansion and intermolecular cyclization sequencing of indoles with amidines has been described. This protocol features easily available substrates and high step-economy. More importantly, dioxygen as the most ideal oxidant was employed under mild reaction conditions. A variety of valuable
Gold(<scp>i</scp>)-catalyzed synthesis of 2-substituted indoles from 2-alkynylnitroarenes with diboron as reductant
作者:Wenqiang Fu、Kai Yang、Jinglong Chen、Qiuling Song
DOI:10.1039/c7ob01918a
日期:——
An efficient method for the synthesis of 2-substitutedindoles via a diboron/base promoted tandem reductive cyclization of o-alkynylnitroarene under Au catalysis conditions has been disclosed. This reaction is efficient and convenient, affording 2-substitutedindoles with broad functional groups tolerance and excellent yields.
An efficient nickel-catalyzed intramolecular direct arylation of imines with challenging aryl chlorides has been developed. The versatile nickel catalysis made use of easily accessible imines and delivered diversely decorated 2-arylindoles of considerable importance to biological and medicinal chemistry.
Chiral Phosphoric Acid Catalyzed Kinetic Resolution of Indolines Based on a Self-Redox Reaction
作者:Kodai Saito、Takahiko Akiyama
DOI:10.1002/anie.201510692
日期:2016.2.24
A strategy for oxidative kineticresolution of racemic indolines was developed, employing salicylaldehyde derivative as the pre‐resolving reagent and chiral phosphoric acid as the catalyst. The iminium intermediate, formed by the condensation reaction of an enantiomer of indoline with salicylaldehyde derivative, was hydrogenated by the same enantiomer of indoline to afford another enantiomer of indoline