Counterion Control of
<i>t</i>
‐BuO‐Mediated Single Electron Transfer to Nitrostilbenes to Construct
<i>N</i>
‐Hydroxyindoles or Oxindoles
作者:Yingwei Zhao、Haoran Zhu、Siyoung Sung、Donald J. Wink、Joseph M. Zadrozny、Tom G. Driver
DOI:10.1002/anie.202104319
日期:2021.8.23
tert-Butoxide unlocks new reactivity patterns embedded in nitroarenes. Exposure of nitrostilbenes to sodium tert-butoxide was found to produce N-hydroxyindoles at room temperature without an additive. Changing the counterion to potassium changed the reaction outcome to yield solely oxindoles through an unprecedented dioxygen-transfer reaction followed by a 1,2-phenyl migration. Mechanistic experiments
Efficient Synthesis of <i>N</i>-Methoxyindoles via Alkylative Cycloaddition of Nitrosoarenes with Alkynes
作者:Andrea Penoni、Giovanni Palmisano、Gianluigi Broggini、Ayako Kadowaki、Kenneth M. Nicholas
DOI:10.1021/jo051609r
日期:2006.1.1
N-Methoxyindoles are produced in moderate to excellent yields from the reaction between nitrosoarenes and alkynes in the presence of K2CO3/(CH3)2SO4. Terminal alkynes with conjugating substituents afford 3-substituted N-methoxyindoles exclusively. The analogous reactions with methyl propiolate provide a one-step preparation of phytoalexin analogues from Wasabi.
在K 2 CO 3 /(CH 3)2 SO 4的存在下,亚硝基芳烃与炔烃之间的反应可中等至极高的产率生产N-甲氧基吲哚。具有共轭取代基的末端炔烃仅提供3-取代的N-甲氧基吲哚。与丙酸甲酯的类似反应提供了从芥末中一步制备植物抗毒素新类似物的方法。