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。