A Tandem Strategy for the Synthesis of 1<i>H</i>-Benzo[<i>g</i>]indazoles and Naphtho[2,1-<i>d</i>]isoxazoles from<i>o</i>-Alkynylarene Chalcones
作者:Sikkandarkani Akbar、Kannupal Srinivasan
DOI:10.1002/ejoc.201201576
日期:2013.3
o-Alkynylarene chalcones when treated with hydrazines and hydroxylamine in the presence of iodine gave 1H-benzo[g]indazoles and naphtho[2,1-d]isoxazoles, respectively. The transformations involve tandem oxidative cyclocondensation/electrophilic hydroarylation. The methodology was applied to quinoline-based chalcones, which also afforded the corresponding quinoline-fused benzindazole and benzisoxazole
Iodine-Catalyzed Synthesis of Highly Functionalized 1<i>H</i>-Indene Derivatives from Michael Adducts of<i>o</i>-Alkynylarene Chalcones with Diethyl Malonate
作者:Sikkandarkani Akbar、Kannupal Srinivasan
DOI:10.1002/ejoc.201501141
日期:2015.12
Upon treatment with a substoichiometric amount of iodine in ethanol under reflux conditions, the Michaeladducts of o-alkynylarene chalcones with diethylmalonate underwent 5-exo-dig Conia-ene cyclization followed by isomerization to yield highlyfunctionalized1H-indenederivatives in good yields.
Discovery of a photochemical cascade process by flow-based interception of isomerising alkenes
作者:Mara Di Filippo、Cristina Trujillo、Goar Sánchez-Sanz、Andrei S. Batsanov、Marcus Baumann
DOI:10.1039/d1sc02879k
日期:——
report the discovery of a new photochemical cascade process through a flow-based strategy for intercepting diradicals generated from simple alkenes. This continuous process delivers a series of unprecedented polycyclic reaction products. Exploring the scope of this novel process revealed that this approach is general and affords a variety of structurally complex reaction products in high yields (up to
在此,我们报告了一种新的光化学级联过程的发现,该过程通过基于流动的策略来拦截由简单烯烃产生的双自由基。这种连续过程提供了一系列前所未有的多环反应产物。探索这种新工艺的范围表明,这种方法是通用的,可以高产率(高达 81%)、短反应时间(7 分钟)和高通量(高达 5.5 mmol h -1)。提出了由计算以及通过 X 射线晶体学确认其身份的关键中间体的分离支持的机械原理。所提出的光化学级联过程通过以高度实用的方式连续产生和拦截高能中间体,证明了新的化学反应性和复杂的化学支架的发现。