Access to Indenones by Rhodium(III)-Catalyzed C–H Annulation of Arylnitrones with Internal Alkynes
作者:Zisong Qi、Mei Wang、Xingwei Li
DOI:10.1021/ol4025309
日期:2013.11
Under redox-neutral conditions, rhodium(III)-catalyzed C–H annulation of N-tert-butyl-α-arylnitrones with internal alkynes has been realized for the synthesis of indenones under mild conditions. This reaction proceeded in moderate to high yields and with good functional group tolerance.
A palladium‐catalyzed ligand‐free carbonylation reaction has been developed for the synthesis of indenones. Under CO atmosphere, this cascade reaction proceeded smoothly to provide the desired indenones in moderate to excellent yields with good functional‐group compatibility. The mechanistic investigations suggested the in situ formation of palladium nanoparticles and this transformation was driven
Rhodium(III)‐Catalyzed Redox‐Neutral Synthesis of Indenones from 2‐Aryl‐3‐nitrosoindoles with Alkynes
作者:Cheng Li、Bin Zhao、Guojiang Mao、Guo‐Jun Deng
DOI:10.1002/adsc.202300639
日期:2023.10.24
Herein, we developed a rhodium(III)-catalyzedsynthesis of indenones from 2-aryl-3-nitrosoindoles and alkynes in a redox-neutral manner. The reaction did not require harsh conditions or any external oxidants. Mechanistic experiments and DFT calculation revealed that the reaction involved directed C−H activation, dearomative spirocyclization, N−O/C−C bond cleavage and ketimine hydrolysis cascade processes
An efficient photocatalysis has been developed for the synthesis of indanone using low-energy greenlight as input energy. This methodology provides a greener avenue to construct indanone through a metal-free photocatalytic radical annulation reaction between α-keto acid and internal alkyne.