Metal‐Free Synthesis of Imidazo[2,1‐
<i>b</i>
]thiazoles from Thioimidazoles and Ketones Mediated by Selectfluor
作者:Jinwu Zhao、Qiannan Xiao、Jiaxi Chen、Jingxiu Xu
DOI:10.1002/ejoc.202000815
日期:2020.8.31
Promoted by Selectfluor, imidazo[2,1‐b]thiazoles could be prepared fromthioimidazoles and ketones. This metal‐free protocol was applicable to various ketones, including strong electron‐withdrawing substituted aryl ketones and alkyl ketones. Moreover, this procedure featured simple operation and easy work‐up.
在Selectfluor的促进下,可以从硫代咪唑和酮制备咪唑并[2,1- b ]噻唑。该无金属方案适用于各种酮,包括强吸电子取代的芳基酮和烷基酮。此外,该程序具有操作简单,易于维护的特点。
DMSO/H
<sub>2</sub>
O
<sub>2</sub>
Promoted Regioselective Synthesis of Benzoimidazo[2,1‐b]thiazoles from 2‐Mercaptobenzimidazoles and Ketones in Water
We report a green and regioselective process for the construction of benzoimidazo[2,1‐b]thiazole skeletons in water using DMSO/H2O2 as an oxidant. The experimental data lend support to a mechanism in which the transformation is initiated by oxidizing methylene of ketone into carbon radical under the oxidation of DMSO/H2O2. This operationally simple and metal‐free procedure could facilitate a diverse
我们报告了使用DMSO / H 2 O 2作为氧化剂在水中构建苯并咪唑并[2,1-b]噻唑骨架的绿色和区域选择性过程。实验数据为通过在DMSO / H 2 O 2的氧化下将酮的亚甲基氧化为碳自由基而引发转化的机理提供了支持。这种操作简单且无金属的方法可以促进苯并咪唑并[2,1-b]噻唑衍生物的多样化收集。
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。