A Hg(OTf)<sub>2</sub>-Catalyzed Enolate Umpolung Reaction Enables the Synthesis of Coumaran-3-ones and Indolin-3-ones
作者:Zhouting Rong、Weican Hu、Ning Dai、Guoying Qian
DOI:10.1021/acs.orglett.0c01096
日期:2020.4.17
The potential of mercury catalysis has been extended to the arena of enolate umpolung reactions for the first time by the generation of enolonium species via Hg(OTf)2-catalyzed N-oxide addition to alkynes. The enolonium species formed can undergo intramolecular nucleophilic attack by hydroxyl or amino groups, leading to the synthesis of various coumaran-3-ones and indolin-3-ones.
An Assembly of Pyrano[3,2‐b]indol‐2‐ones via NHC‐Catalyzed [3 + 3] Annulation of Indolin‐3‐ones with Ynals†
作者:Xia Wang、Shulei Zhang、Shao‐Jie Wang、Hao An、Xiaolan Xin、Haonan Lin、Zhifeng Tu、Shenci Lu
DOI:10.1002/cjoc.202300728
日期:2024.7
We report herein an unprecedented N-heterocycliccarbene-catalyzed formal [3 + 3] annulation of ynals with N-Ts indolin-3-ones under the oxidation condition affording the functionalized pyrano[3,2-b]indol-2-ones. The alkynyl acylazoliums via the combination of a carbene with ynals in the presence of oxidate proved to be the important intermediates for the success of this transformation. This method
products. Its light-absorption properties make it useful for the design of functional molecules. However, versatile synthesis methods have not yet been reported. In this report, we present a versatile synthetic method for pseudoindoxyls using the direct S0 → Tn transition under visiblelight irradiation. We also discuss the application of pseudoindoxyls as photocatalysts.
假吲哚酚是在各种天然产物中发现的部分骨架。其光吸收特性使其可用于功能分子的设计。然而,通用的合成方法尚未见报道。在本报告中,我们提出了一种在可见光照射下利用直接 S 0 → T n跃迁合成假吲哚酚的通用方法。我们还讨论了假吲哚酚作为光催化剂的应用。