DEAD-Promoted Oxidative Ugi-Type Reaction Including an Unprecedented Ugi Amidation Assisted by Dicarboxylic Acids
作者:Jiankun Wang、Yilin Sun、Guangji Wang、Le Zhen
DOI:10.1002/ejoc.201701323
日期:2017.11.16
A mild and metal-free DEAD-promoted oxidative Ugi-type reaction of tertiary amines has been demonstrated, giving facile access to α-amino amides and imides with diverse functional groups in good isolated yields. This Ugi-type approach achieves an unprecedented synthesis of α-amino amide analogues with the assistance of dicarboxylic acids, but not water, for the introduction of carbonyl oxygen of the
已经证明了温和且无金属的 DEAD 促进的叔胺氧化 Ugi 型反应,可以轻松获得具有不同官能团的 α-氨基酰胺和酰亚胺,并具有良好的分离产率。这种 Ugi 类型的方法在二羧酸的帮助下实现了前所未有的 α-氨基酰胺类似物合成,而不是水,用于引入酰胺部分的羰基氧。机理研究表明,二元羧酸很容易发生分子内环化,而不是 Mumm 重排,从而提供所需的酰胺,同时释放一分子酸酐。
Bodipy-Based Metal–Organic Frameworks Transformed in Solid States from 1D Chains to 2D Layer Structures as Efficient Visible Light Heterogeneous Photocatalysts for Forging C–B and C–C Bonds
the porous frameworks, both BMOF 2D and BMON 2D displayed high reactivity and recyclability in the photocatalytic inverse hydroboration and cross-dehydrogenativecoupling reactions to afford α-amino organoborons and α-amino amides in moderate to high yields. This work not only highlights the cascade utilization of ligand installation and ultrasonic liquid exfoliation methods to provide the single-layer
A Comparative Mechanistic Study of Cu-Catalyzed Oxidative Coupling Reactions with <i>N</i>-Phenyltetrahydroisoquinoline
作者:Esther Boess、Corinna Schmitz、Martin Klussmann
DOI:10.1021/ja211697s
日期:2012.3.21
A comparative mechanistic study of Cu-catalyzed oxidative coupling reactions of N-phenyltetrahydroisoquinoline with different nucleophiles was conducted. Two previously reported combinations of catalyst and oxidant were studied, CuCl2 center dot 2H(2)O/O-2 and CuBr/tert-butyl hydroperoxide (TBHP). On the basis of a synthetic study with different nucleophiles, the electrophilicity of the intermediate iminium ion was estimated and differences between the two methods were revealed. The key intermediate in the aerobic method is shown to be an iminium ion, formed through oxidation by copper(II), which can react with any nudeophile of sufficient reactivity. The role of oxygen is the reoxidation of the reduced catalyst. In the CuBr/TBHP system, an alpha-amino peroxide is proposed as a true intermediate within the catalytic cycle, formed from the amine and TBHP by a Cu-catalyzed radical reaction pathway and acting as a precursor to the iminium ion intermediate.