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。
Metal-Free Iodine/TEMPO-Mediated Aerobic Oxidative Ugi-Type Multicomponent Reactions with Tertiary Amines
作者:Dengke Li、Xianfu Shen、Jian Lei
DOI:10.1021/acs.joc.9b03168
日期:2020.2.21
A novel aerobic oxidative Ugi-type multicomponent reaction (MCR) with tertiaryamines was developed. The reaction was initiated by C(sp3)-H oxidation of the amine, followed by nucleophilic attack on the highly reactive isocyanide, generating nitrilium ion intermediates. If these intermediates were trapped by water in the system, α-amido amines could be delivered as the Ugi-3CR products. If exogenous
Oxidative three-component reactions for the direct synthesis of α-amino amides and imides from tertiary amines have been developed. These reactions involve the functionalization of C(sp3)–H bonds adjacent to nitrogen atoms via mild aerobicoxidationusingvisiblelightphotoredoxcatalysis. The protocols are applicable to a wide range of amines and isocyanides, as well as water and carboxylic acids
Photoredox catalysis under shear using thin film vortex microfluidics
作者:Michael N. Gandy、Colin L. Raston、Keith A. Stubbs
DOI:10.1039/c5cc02153g
日期:——
A microfluidic vortex fluidic device (VFD) operating in either confined or continuous mode is effective in high yielding photoredox reactions involving Rose Bengal, with short reaction times.
Visible-light mediated heterogeneous C–H functionalization: oxidative multi-component reactions using a recyclable titanium dioxide (TiO2) catalyst
作者:Carlos Vila、Magnus Rueping
DOI:10.1039/c3gc40587g
日期:——
Visible-light mediated heterogeneous C–H functionalization of tertiaryamines provides access to a variety of α-amino amides. An oxidative, titanium dioxide catalyzed, Ugi-type, three-component reaction has been developed in which the catalyst can be recycled without loss of activity.