Silver-Catalyzed Stereoselective [3+2] Cycloadditions of Cyclopropyl-Indanimines with Carbonyl Compounds
作者:Hsiao-Hua Hung、Yi-Ching Liao、Rai-Shung Liu
DOI:10.1002/adsc.201300090
日期:2013.5.17
Silver‐catalyzed stereoselective [3+2] cycloadditions between mono‐substituted cyclopropyl‐indanimines and aldehydes are reported. The stereochemical course of the reaction is rationalized with a cyclic transition state. The resulting indanimine cycloadducts are not readily hydrolyzed unless external aldehydes are present with the silver catalyst. Notably, this hydrolysis process leads to a change
Gold(I) Catalysis Applied to the Stereoselective Synthesis of Indeno[2,1-<i>b</i>]thiochromene Derivatives and Seleno Analogues
作者:Cintia Virumbrales、Mahmoud A. E. A. A. A. El-Remaily、Samuel Suárez-Pantiga、Manuel A. Fernández-Rodríguez、Félix Rodríguez、Roberto Sanz
DOI:10.1021/acs.orglett.2c03411
日期:2022.11.4
synthesis of sulfur- or selenium-containing indeno[1,2-b]chromene derivatives from o-(alkynyl)styrenes substituted at the triple bond with a thio- or seleno-aryl group is described. The reaction involves a double cyclization process through a proposed key gold–cyclopropyl carbene intermediate that evolves by the intramolecularaddition of an aromatic to the cyclopropane ring, affording polycyclic structures
金 (I) 催化的级联反应,用于立体选择性合成含硫或含硒的茚并 [1,2- b ] 色烯衍生物,从邻(炔基)苯乙烯在三键处被硫代或硒代芳基取代组进行了说明。该反应涉及通过提出的关键金-环丙基卡宾中间体的双环化过程,该中间体通过将芳族化合物分子内加成到环丙烷环上而形成,提供多环结构。使用带有手性配体的金 (I) 配合物研究了对映选择性版本。
Gold-Catalyzed Cyclization/Oxidative [3+2] Cycloadditions of 1,5-Enynes with Nitrosobenzenes without Additional Oxidants
作者:Chun-Hao Chen、Yen-Ching Tsai、Rai-Shung Liu
DOI:10.1002/anie.201209850
日期:2013.4.22
Golden control: The title reaction (see scheme) proceeds with high stereocontrol to generate the heterocyclic products in good yield. Experiments to probe the mechanism were performed.
黄金控制:标题反应(参见方案)以高度立体控制进行,以高收率产生杂环产物。进行了探索该机理的实验。
Gold-Catalyzed Oxidative Cyclization of 1,5-Enynes Using External Oxidants
作者:Dhananjayan Vasu、Hsiao-Hua Hung、Sabyasachi Bhunia、Sagar Ashok Gawade、Arindam Das、Rai-Shung Liu
DOI:10.1002/anie.201102581
日期:2011.7.18
Golden circle: Two gold‐catalyzed oxidativecyclizations of 1,5‐enynes using 8‐methylquinoline N‐oxide are presented (see example). Experimental results indicate that both reactions proceed through prior oxidation of alkyne to form α‐carbonyl intermediates and subsequent intramolecular carbocyclization.