Iron-catalyzed aerobic difunctionalization of alkenes: a highly efficient approach to construct oxindoles by C–S and C–C bond formation
作者:Tao Shen、Yizhi Yuan、Song Song、Ning Jiao
DOI:10.1039/c4cc00401a
日期:——
A novel iron-catalyzed efficient approach to construct sulfone-containing oxindoles, which play important roles in the structural library design and drug discovery, has been developed. The use of readily available benzenesulfinic acids, an inexpensive iron salt as the catalyst, and air as the oxidant makes this sulfur incorporation protocol very efficient and practical.
Iron-catalysed radical cyclization to synthesize germanium-substituted indolo[2,1-<i>a</i>]isoquinolin-6(5<i>H</i>)-ones and indolin-2-ones
作者:Yani Luo、Tian Tian、Yasushi Nishihara、Leiyang Lv、Zhiping Li
DOI:10.1039/d1cc03907e
日期:——
A simple and efficient iron-catalysed radical cyclization to synthesize germanium-substituted indolo[2,1-a]isoquinolin-6(5H)-ones and indolin-2-ones has been developed.
Metal-Free Radical Azidoarylation of Alkenes: Rapid Access to Oxindoles by Cascade CN and CC Bond-Forming Reactions
作者:Kiran Matcha、Rishikesh Narayan、Andrey P. Antonchick
DOI:10.1002/anie.201303550
日期:2013.7.29
A novel method for the oxidative radical azidation of alkenes relies on an azide in combination with a hypervalent iodine reagent. A cascade of CN and CC bond‐forming reactions yields 2‐oxindoles under metal‐free conditions with high reaction rates at ambient temperature and provides access to complex products (see scheme; TMS=trimethylsilyl).
The visible-light-induced photoredox carbon radicalformationfrom aqueous sulfoxonium ylides has been demonstrated for the first time. While direct reduction of sulfoxonium ylides by H2O efficiently generates the corresponding hydrocarbon compounds, the use of additional alkenes as radical acceptors alters the chemical reactivity to achieve alkene carboarylation of N-arylacrylamides. Mechanistic studies
第一次证明了可见光诱导的由水性氧化硫叶立德形成的光氧化还原碳自由基。虽然通过 H 2 O直接还原氧化亚硝基有效地生成相应的碳氢化合物,但使用额外的烯烃作为自由基受体会改变化学反应性以实现N-芳基丙烯酰胺的烯烃碳芳基化。机理研究揭示了两种不同的反应途径,这些反应途径参与了水性氧化硫叶立德的碳自由基形成,导致还原释放二甲砜和碳芳基化形成 DMSO。
Visible‐Light‐Induced Photoredox Dehydrative Coupling/Cyclization of N‐Arylacrylamides with Hydroxyketones
A mild visible-light induced 4CzIPN/H+ photoredox system has been developed that enables hydroxyketones serving as a carbon radical precursor via formal C−O bond cleavage. This process was successfully exploited in the coupling/cyclization reaction of N-arylacrylamides and thereby provided a viable access to acyl oxindoles. This protocol features advantages including no need for any metal catalyst
已开发出一种温和的可见光诱导 4CzIPN/H +光氧化还原系统,使羟基酮能够通过正式的 C−O 键裂解充当碳自由基前体。该过程已成功用于 N-芳基丙烯酰胺的偶联/环化反应,从而为酰基羟吲哚提供了可行途径。该方案的优点包括不需要任何金属催化剂和添加剂、高产率、广泛的底物范围、克可扩展性以及 H 2 O 作为唯一副产物的释放。