An efficient intermolecular trans-selective β-hydroamidation of ynamides to furnish a series of (Z)-ethene-1,2-diamide derivatives with excellent regio- and stereo-selectivities is described. The trans-β-addition reactions have been illustrated for a wide range of substrates and proceeded under basic reaction conditions using readily available materials in the absence of a transition-metal catalyst
Photo-induced synthesis of β-sulfonyl imides from carboxylic acids
作者:Linwei Zeng、Jian Jin、Jixiao He、Sunliang Cui
DOI:10.1039/d1cc02559g
日期:——
A photo-induced imidation process of carboxylic acids is described. Numerous carboxylic acids could convert to β-sulfonyl imides in the presence of N-sulfonyl ynamides under visible light irradiation. Control experiments and mechanistic studies demonstrate that this imidation process involves a hydroacyloxylation/radical rearrangement cascade. This protocol represents a direct imidation method from
A highly efficient, two-step, one-pot synthetic strategy for amides and peptides was developed by employing ynamides as novel couplingreagents under extremely mild reaction conditions. The ynamides not only are effective for simple amide and dipeptide synthesis but can also be used for peptide segment condensation. Importantly, no racemization was detected during the activation of chiral carboxylic
The first trans‐selective β‐hydrophosphorylation of ynamides, which provides a facile approach to (Z)‐β‐phosphor‐enamide derivatives in moderate to excellent yields and with excellent regio‐ and stereoselectivity, is described. This transition‐metal‐freereaction is featured with operationally simple procedure, mild reaction conditions, readily available starting materials, broad substrate scope and
Metal-free C8–H functionalization of quinoline <i>N</i>-oxides with ynamides
作者:Weican Hu、Feiyang Zhang、Chen Chen、Tianhang Qi、Yanlong Shen、Guoying Qian、Zhouting Rong
DOI:10.1039/d1cc02138a
日期:——
The metal-free C8–H functionalization of quinolineN-oxides with ynamides is unveiled for the first time by the intramolecular Friedel–Crafts-type reaction of quinolyl enolonium intermediates generated from Brønsted acid-catalyzed addition of quinolineN-oxides to ynamides. Various quinolineN-oxides and terminal ynamides prove to be suitable substrates for this method. A one-pot protocol was then