Gold-Catalyzed Intermolecular [4+2] and [2+2+2] Cycloadditions of Ynamides with Alkenes
作者:Ramesh B. Dateer、Balagopal S. Shaibu、Rai-Shung Liu
DOI:10.1002/anie.201105921
日期:2012.1.2
As good as gold: Gold‐catalyzedintermolecular [4+2] cycloadditions of 2‐arylynamides with alkenes and gold‐catalyzed [2+2+2] cycloadditions of terminal ynamides with enol ethers have been developed (see scheme). The [4+2] cycloaddition is compatible with a range of alkenes and arylynamides and the [2+2+2] cycloaddition can also accommodate a variety of different arylynamide and enol ether substrates
Copper-Catalyzed Aerobic Oxidative Amidation of Terminal Alkynes: Efficient Synthesis of Ynamides
作者:Tetsuya Hamada、Xuan Ye、Shannon S. Stahl
DOI:10.1021/ja077406x
日期:2008.1.1
A copper-catalyzed method for the preparation of ynamides has been identified that proceeds via aerobicoxidative coupling of terminal alkynes with various nitrogen nucleophiles, including cyclic carbamates, amides and ureas, and N-alkyl-arylsulfonamides and indoles.
Synthesis of Polycyclic Benzofused Nitrogen Heterocycles via a Tandem Ynamide Benzannulation/Ring-Closing Metathesis Strategy. Application in a Formal Total Synthesis of (+)-FR900482
作者:Xiao Yin Mak、Aimee L. Crombie、Rick L. Danheiser
DOI:10.1021/jo2000308
日期:2011.3.18
variety of functionalized substituents at the position ortho to the nitrogen. In the second stage of the tandem strategy, ring-closingmetathesis generates the nitrogen heterocyclic ring. This two-step sequence provides efficient access to highly substituted dihydroquinolines, benzazepines, benzazocines, and related benzofused nitrogen heterocyclic systems. The application of this chemistry in a concise
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
diazo-compounds was developed. DFT calculations showed that this transformation relies on an uncommon, reversed mechanism that, regardless of the polarization of the ynamide, favors the addition of the diazo compound at the β-position of the ynamide. The protocol tolerates a wide range of functional groups. This copper-catalyzed process represents the first synthesis of tri-, di- or per-fluorinated N-allenamides