据报道,使用N-甲氧基酰胺进行了铜催化的芳基三氟硼酸酯的亲电酰胺化反应。该反应显示出源自两个明显特征的高官能团相容性:1)N-甲氧基酰胺的高稳定性,以及2)在LiCl存在下的非碱性温和条件。所开发的方法还可以用于合成广泛分布于天然产物中的烯酰胺。初步的机理研究表明,第一步是在LiCl的协助下对三氟硼酸芳基酯进行金属转移,生成的芳基铜中间体通过非S N 2氧化添加至N-甲氧基酰胺并随后进行还原消除而提供了苯胺。
Leveraging the Domino Skeletal Expansion of Thia-/Selenazolidinones via Nitrogen-Atom Transfer in Hexafluoroisopropanol: Room Temperature Access to Six-Membered S/Se,N-Heterocycles
作者:Vandana Jaiswal、Mangilal Godara、Dinabandhu Das、Vincent Gandon、Jaideep Saha
DOI:10.1021/acs.joc.1c02621
日期:2022.1.7
Herein, a highly regioselective domino skeletal-expansion process that transforms 2-aminothiazolidinone into six-membered S,N-heterocycle is developed with the aid of TMS-azide in hexafluoroisopropanol (HFIP) at ambient temperature. Functioning of the C2 tertiaryamine as latent reactive group on thiazolidinone moiety was the key to this development, which allowed relay substitution with azide and
<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.
Cross-Dehydrogenative N–N Coupling of Aromatic and Aliphatic Methoxyamides with Benzotriazoles
作者:Pooja Y. Vemuri、Frederic W. Patureau
DOI:10.1021/acs.orglett.1c01034
日期:2021.5.21
are ubiquitous in bioactive compounds and organic materials. However, intermolecular hetero-selective N–H/N–H oxidative coupling reactions remain very challenging and largely unexplored. Here, we report an unprecedented, simple and hetero-selective cross-dehydrogenative N–N coupling of amides and benzotriazoles, utilizing only a hypervalent iodine species as the terminal oxidant. The scope and mechanistic
Rhodium-Catalyzed Azine-Directed C–H Amidation with <i>N</i>-Methoxyamides
作者:Tao Ban、Huu-Manh Vu、Jing Zhang、Jia-Yuan Yong、Qiong Liu、Xu-Qin Li
DOI:10.1021/acs.joc.1c02868
日期:2022.5.6
N-methoxyamide reagents as an amide source, C–H amidation was realized at the ortho position of azine under the action of rhodium and boric acid. The method has mild reaction conditions, high atomic utilization, excellent yield, and wide adaptability to amidation reagents (both aromatic amides and fatty amides are applicable). Amide-substituted ketones can be obtained by a simple treatment and can be further transformed