Indium Triiodide Catalyzed Reductive Functionalization of Amides via the Single-Stage Treatment of Hydrosilanes and Organosilicon Nucleophiles
摘要:
The indium triiodide catalyzed single-stage cascade reaction of N-sutfonyl amides with hydrosilanes and two types of organosilicon nucleophiles such as silyl cyanide and silyl enolates selectively promoted deoxygenative functionalization to give alpha-cyanoamines and beta-aminocarbonyl compounds, respectively.
A Green Synthetic Route to Imides from Terminal Alkynes and Amides by Simple Solid Catalysts
作者:Xiongjie Jin、Kazuya Yamaguchi、Noritaka Mizuno
DOI:10.1246/cl.2012.866
日期:2012.9.5
An atom-efficient and green synthetic route to highly valuable imides (54–92% yields) from terminal alkynes and amides has been developed. This new route is composed of two consecutive reactions, that is, (i) the reported Cu(OH)2-catalyzed cross-coupling of terminal alkynes and amides to ynamides and (ii) the Sn–W mixed oxide-catalyzed regioselective hydration of ynamides.
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
Treatment of N-(1-alkynyl)amides and 1-alkynyl sulfides with diphenyldithiophosphinic acid affords (E)-ketene N,S-acetals and S,S-acetals, respectively. The addition reactions proceed in syn fashio...
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
A formal [3 + 2] cycloaddition between ynamides and unprotected isoxazol-5-amines has been developed in the presence of catalytic AgNTf2 in an open flask. By the protocol, a variety of functionalized 5-amino-1H-pyrrole-3-carboxamide derivatives can be obtained in up to 99% yield. The reaction mechanism might involve the generation of an unusual α-imino silver carbene intermediate (or a silver-stabilized