An Annulative Electrophilic Amination Approach to 3-Aminobenzoheteroles
摘要:
A copper-catalyzed annulative amination approach to 3-aminobenzofurans and -indoles from o-alkynylphenols and -anilines has been developed. The Cu-based catalysis is based on an umpolung, electrophilic amination with O-benzoyl hydroxylamines and enables the mild and convergent synthesis of various 3-aminobenzoheteroles of biological and pharmaceutical interest. Some mechanistic investigations and an application of this protocol to construction of more complex tricyclic framework are also described.
An Annulative Electrophilic Amination Approach to 3-Aminobenzoheteroles
摘要:
A copper-catalyzed annulative amination approach to 3-aminobenzofurans and -indoles from o-alkynylphenols and -anilines has been developed. The Cu-based catalysis is based on an umpolung, electrophilic amination with O-benzoyl hydroxylamines and enables the mild and convergent synthesis of various 3-aminobenzoheteroles of biological and pharmaceutical interest. Some mechanistic investigations and an application of this protocol to construction of more complex tricyclic framework are also described.
A palladium-catalyzedasymmetric tandem C–C bond activation/Cacchi reaction between cyclobutanones and o-ethynylanilines was reported. The transient chiral σ-alkylpalladium species generated via enantioselective C(sp3)–C(sp2) bond activation of cyclobutanones promotes cyclization of o-ethynylanilines, leading to one-carbon-tethered chiral indanone-substituted indoles. Two C–C bonds and one C–N bond
PIFA/Ar2Te2‐Mediated Synthesis of 3‐Aryltelluroindoles via Intramolecular Cyclization of 2‐Alkynylanilines
作者:Jianing Zhang、Zhenyang Yu、Haofeng Shi、Lingzhi Xu、Yixuan Song、Yunfei Du
DOI:10.1002/ejoc.202301059
日期:2024.2.5
The reaction of 2-alkynylanilines with phenyliodonium bis(trifluoroacetate) (PIFA) and diaryl ditellurides was found to conveniently afford the corresponding 3-aryltelluroindoles via oxidative cyclization/tellurolation. A plausible mechanism involving the in situ formation of the reactive ArTeOCOCF3 from the reaction of PIFA and diaryl ditellurides, and the subsequent oxidative C−N/C−Te bond formations