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
Transition-Metal-Free Tunable Chemoselective N Functionalization of Indoles with Ynamides
作者:Alexandre Hentz、Pascal Retailleau、Vincent Gandon、Kevin Cariou、Robert H. Dodd
DOI:10.1002/anie.201402767
日期:2014.8.4
Two unprecedented Nfunctionalizations of indoles with ynamides are described. By varying the electron‐withdrawing group on the ynamide nitrogen atom, either Z‐indolo‐etheneamides or indolo‐amidines can be selectively obtained under the same metal‐free reaction conditions. The scope and synthetic potential of these reactions, as well as some mechanistic insights provided by DFT calculations, are reported
A mild and efficient methodology concerning I2/TBHP-mediated intermolecular iodoamination of ynamides with amines for the synthesis of [small alpha]-amino-[small beta],[small beta]-diiodo-enamides was developed. This reaction provides the first intermolecular iodoamination of terminal alkynes...
Gold-Catalyzed <i>N</i>-Alkenylation of Isoxazolines and the Use of Alkenyl Gold Intermediates in the Synthesis of 2-Amino-1-pyrrolines
作者:Abdullah S. Alshreimi、Guanqun Zhang、Esther J. Shim、Donald J. Wink、Laura L. Anderson
DOI:10.1021/acscatal.3c05824
日期:2024.2.16
A gold-catalyzed method for N-alkenylation has been developed for NH-isoxazolines, which are challenging substrates for alternative transition-metal-catalyzed N-functionalization reactions. Generation of a vinyl gold intermediate from the addition of NH-isoxazolines to gold-activated ynamides initiates a diastereoselective [3,3′]-sigmatropic rearrangement to give 2-amino-1-pyrrolines. Optimization
针对 N H -异恶唑啉开发了一种金催化的N -烯基化方法,它是替代过渡金属催化的 N 功能化反应的具有挑战性的底物。将 N H -异恶唑啉添加到金激活的 ynamides 中生成乙烯基金中间体,引发非对映选择性 [3,3']-σ 重排,得到 2-氨基-1-吡咯啉。除了反应范围、用于制备手性非外消旋 2-氨基-1-吡咯啉的手性助剂的使用以及机理见解之外,还描述了该转化的优化。该方法制备了通过传统方法难以获得的杂环化合物,并且能够实现金催化的断开。
Application of Ynamides in the Synthesis of 2-Amidoindoles
A Pd-catalyzed, one-pot, two-step synthesis of 2-amidoindoles from ynamides and o-lodoanilines Is reported. A key highlight of this sequence is that after the Sonogashira reaction, intramolecular cyclization to the indole occurs spontaneously without activation of the alkyne.