Iodonium Ylides as Carbene Precursors in Rh(III)-Catalyzed C–H Activation
作者:Yuqin Jiang、Pengfei Li、Jie Zhao、Bingxian Liu、Xingwei Li
DOI:10.1021/acs.orglett.0c02618
日期:2020.10.2
The rhodium(III)-catalyzed coupling of C–H substrates with iodonium ylides has been realized for the efficientsynthesis of diverse cyclic skeletons, where the iodonium ylides have been identified as efficient and outstanding carbene precursors. The reaction systems are applicable to both sp2 and sp3 C–H substrates under mild and redox-neutral conditions. The catalyst loading can be as low as 0.5 mol
C−N Bond formation is of great significance due to the ubiquity of nitrogen‐containing compounds. Here, a mild and efficient RhIII‐catalyzed C(sp3)−H aryl amination reaction is reported. Anthranil is employed as the nitrogen source with 100 % atom efficiency. This C−H amination reaction exhibits broad substrate scope without using any external oxidants. Mechanistic studies including rhodacycle intermediates
Palladium-Catalyzed Direct α-Ketoesterification of 8-Methylquinoline Derivatives with α-Ketoacids via Dehydrogenation Coupling Reaction
作者:Lesong Li、Feng Zhang、Guo-Jun Deng、Hang Gong
DOI:10.1021/acs.orglett.8b03276
日期:2018.11.16
A direct, regiospecific, and efficient palladium-catalyzed α-ketoesterification of 8-methylquinoline derivatives to generate α-ketoesters has been discovered. This reaction is conducted at a mild temperature, free of peroxide, and compatible with air, and various α-ketoesters were achieved with good yields. Importantly, this reaction can be easily amplified to gram level using only 1 mol % of the palladium
Rh(III)-catalyzedoxidative cross-coupling of C(sp3)H bonds with C(sp2)H bonds has been accomplished under mild conditions. This method furnishes a streamlined route for the C(sp3)Halkenylation and arylation of 8-methylquinolines. This protocol enables 8-methylquinolines to couple with different quinone and thiophene derivatives.