three-component 1,4-carboamination of dienes is described. Synthetically versatile Weinreb amides were coupled with 1,3-dienes and readily available dioxazolones as the nitrogen source using [Cp*RhCl2 ]2 -catalyzed C-H activation to deliver the 1,4-carboaminated products. This transformation proceeds under mild reaction conditions and affords the products with high levels of regio- and E-selectivity. Mechanistic
Iridium-Catalyzed C–H Amination of Weinreb Amides: A Facile Pathway toward Anilines and Quinazolin-2,4-diones
作者:Xunqing Dong、Panpan Ma、Tao Zhang、Hitesh B. Jalani、Guigen Li、Hongjian Lu
DOI:10.1021/acs.joc.0c01789
日期:2020.10.16
C–H amination of arenes directed by weakly coordinating Weinreb amides has been achieved with an iridium catalyst and 2,2,2-trichloroethoxycarbonyl (Troc) azide as an aminating agent, providing a robust method of producing synthetic useful ortho-TrocNH aryl Weinreb amides. Taking advantage of the reactivity of Weinreb amide and Troc groups in the amination products, selective hydrolysis was achieved
The (η5‐pentamethylcyclopentadienyl)cobalt(III) (Cp*CoIII)‐catalyzed C−H bond functionalization of aromatic, heteroaromatic, and α,β‐unsaturated Weinreb amides was explored. C−H allylation reactions with the use of allyl carbonate and a perfluoroalkene, oxidative alkenylation reactions with the use of ethyl acrylate, iodination reactions with the use of N‐iodosuccinimide, and amidation reactions with
探索了(η 5 -五甲基环戊二烯基)钴 (III) (Cp*Co III )-催化的芳族、杂芳族和 α,β-不饱和 Weinreb 酰胺的 C-H 键官能化。Cp * Co ( CO)I 2在阳离子 Ag 盐和 AgOAc 存在下提供各种合成有用的结构单元。C−H 烯丙基化的机理研究表明,C−H 激活步骤决定速率并且几乎不可逆。
C−H Oxygenation Reactions Enabled by Dual Catalysis with Electrogenerated Hypervalent Iodine Species and Ruthenium Complexes
作者:Leonardo Massignan、Xuefeng Tan、Tjark H. Meyer、Rositha Kuniyil、Antonis M. Messinis、Lutz Ackermann
DOI:10.1002/anie.201914226
日期:2020.2.17
The catalytic generation of hypervalent iodine(III) reagents by anodic electrooxidation was orchestrated towards an unprecedented electrocatalytic C−H oxygenation of weakly coordinating aromatic amides and ketones. Thus, catalytic quantities of iodoarenes in concert with catalytic amounts of ruthenium(II) complexes set the stage for versatile C−H activations with ample scope and high functional group
Rhodium-Catalyzed CH Olefination of Aryl Weinreb Amides
作者:Yan Wang、Chao Li、Yan Li、Feng Yin、Xi-Sheng Wang
DOI:10.1002/adsc.201300174
日期:2013.6.17
A rhodium(III)‐catalyzed oxidative CHolefination directed by Weinrebamides, a class of well developed versatile building blocks in organic synthesis, has been developed with air as the terminal oxidant. The reactions proceed with excellent reactivity, good functional group tolerance and high yields.