Salicylic Acid‐Promoted Three‐Component Annulation of Benzimidazoles, Aryl Nitroalkenes and Elemental Sulfur
作者:Ruhuai Mei、Feng Xiong、Chenrui Yang、Jinwu Zhao
DOI:10.1002/adsc.202001564
日期:2021.3.29
an efficient mediator for the present transformation. This protocol provides a facile access to structurally significant imidazo[2,1‐b]thiazole skeleton from simple raw materials with a range of compatible synthetically useful functionalities. Furthermore, gram‐scale preparation of this method is effective, which enables potential applications of it in broader fields of molecule synthesis. Mechanistically
本文研究了苯并咪唑,芳基硝基烯烃和元素硫的三组分环化反应。发现便宜且容易获得的水杨酸是本转化的有效介体。该协议提供了从具有各种兼容的合成有用功能的简单原料轻松访问结构上重要的咪唑并[2,1- b ]噻唑骨架的方法。此外,这种方法的克级制备是有效的,这使其有可能在更广泛的分子合成领域中应用。从机理上讲,提出了一个反应级联反应,包括顺序的氮杂-迈克尔加成,亲核硫酸化和脱氨基芳构化。
C(sp<sup>2</sup>)–H selenylation of substituted benzo[4,5]imidazo[2,1-<i>b</i>]thiazoles using phenyliodine(<scp>iii</scp>)bis(trifluoroacetate) as a mediator
作者:Prasanjit Ghosh、Gautam Chhetri、Anirban Mandal、Yu Chen、William H. Hersh、Sajal Das
DOI:10.1039/d4ra00057a
日期:——
Herein, an expeditious metal-free regioselective C–H selenylation of substituted benzo[4,5]imidazo[2,1-b]thiazole derivatives was devised to synthesize structurally orchestrated selenoethers with good to excellent yields. This PIFA [bis(trifluoroacetoxy)iodobenzene]-mediated protocol operates under mild conditions and offers broad functional group tolerance. In-depth mechanistic investigation supports
在此,设计了取代苯并[4,5]咪唑并[2,1- b ]噻唑衍生物的快速无金属区域选择性C-H硒基化,以合成结构精心设计的硒醚,产率良好至优异。这种 PIFA [双(三氟乙酰氧基)碘苯] 介导的方案在温和条件下运行,并提供广泛的官能团耐受性。深入的机制研究支持激进途径的参与。此外,该方法的合成效用是通过克级合成来描述的。