A [Cp*RhIII]‐catalyzed direct C−H amidation is carried out in ionic liquid. Both C(sp2)−H bonds of (hetero)arenes and alkenes and unactivated C(sp3)−H bonds can be easily amidated with high functional‐group tolerance and excellent yields under these conditions. Notably, using [Cp*RhIII]/[BMIM]BF4 (BMIM=1‐butyl‐3‐methylimidazolium) as the green and recyclable medium is environmentally benign, in light
[Cp * Rh III ]催化的直接CHH酰胺化反应在离子液体中进行。在这些条件下,(杂)芳烃和烯烃的C(sp 2)-H键和未活化的C(sp 3)-H键都容易被酰胺化,具有很高的官能团耐受性和优异的收率。值得注意的是,考虑到诸如昂贵的铑催化剂的可重复使用性等特性,使用[Cp * Rh III ] / [BMIM] BF 4(BMIM = 1-丁基-3-甲基咪唑鎓)作为绿色且可回收的介质对环境无害。避免剧毒的有机溶剂,温和的反应条件以及较短的反应时间。
<i>N</i>-Methoxyamide: An Alternative Amidation Reagent in the Rhodium(III)-Catalyzed C–H Activation
作者:Chao Zhou、Junqi Zhao、Weicong Guo、Jijun Jiang、Jun Wang
DOI:10.1021/acs.orglett.9b03357
日期:2019.12.6
In the field of transition-metal-catalyzed C-Hactivation, N-methoxyamides are widely used as C-Hactivation substrate. Unexpectedly, in this work N-methoxyamides were found to work as efficient amidation reagents in the rhodium(III)-catalyzedC-Hactivation with boric acid as a cocatalyst. This reaction features broad substrate scope and good yields.