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.
The palladium(II)-catalyzedcarbocyclization of benzenecarbaldehydes with internal alkynes to afford 2,3-disubstituted indenones was reported. The annulation reaction proceeded through the transmetalation of Pd(II) with an aromatic aldehyde and the insertion of internal alkynes, followed by cyclization via the intramolecular nucleophilic addition of intermediate organopalladium(II) species to the aldehyde
报道了钯( II )催化的苯甲醛与内部炔烃的碳环化反应得到2,3-二取代茚酮。环化反应通过 Pd( II ) 与芳香醛的金属转移和内部炔烃的插入进行,然后通过中间有机钯( II ) 物质与醛基的分子内亲核加成环化。该反应以中等至良好的产率进行,具有高区域选择性。
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
Carbopalladation of Nitriles: Synthesis of 2,3-Diarylindenones and Polycyclic Aromatic Ketones by the Pd-Catalyzed Annulation of Alkynes and Bicyclic Alkenes by 2-Iodoarenenitriles
作者:Alexandre A. Pletnev、Qingping Tian、Richard C. Larock
DOI:10.1021/jo026178g
日期:2002.12.1
represents one of the first examples of the addition of an organopalladium moiety to the carbon-nitrogentriplebond of a nitrile. The reaction is compatible with a number of functional groups. A reaction mechanism, as well as a model accounting for the electronic effects of substituents on the aromatic ring of the nitrile, is proposed.