我们在这里报告通过噻唑并[3,2- a ]苯并咪唑鎓或苯并咪唑并[2,1- b ] [1,3]苯并噻唑的开环合成高度官能化的1,3-二氢-2H-苯并咪唑-2-酮-6-ium盐和醇盐异常的C–O键裂解。以高收率获得了多种带有原始N-硫代烯基或N-(邻硫代)芳基的苯并咪唑酮。先进的化学方法可快速有效地访问特权的苯并咪唑-2-酮骨架。
我们在这里报告通过噻唑并[3,2- a ]苯并咪唑鎓或苯并咪唑并[2,1- b ] [1,3]苯并噻唑的开环合成高度官能化的1,3-二氢-2H-苯并咪唑-2-酮-6-ium盐和醇盐异常的C–O键裂解。以高收率获得了多种带有原始N-硫代烯基或N-(邻硫代)芳基的苯并咪唑酮。先进的化学方法可快速有效地访问特权的苯并咪唑-2-酮骨架。
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。
Synthesis of Benzo[4,5]imidazo[2,1-<i>b</i>
]thiazole by Copper(II)-Catalyzed Thioamination of Nitroalkene with 1<i>H</i>
-Benzo[<i>d</i>
]imidazole-2-thiol
作者:Sourav Jana、Amrita Chakraborty、Valerii Z. Shirinian、Alakananda Hajra
DOI:10.1002/adsc.201800393
日期:2018.6.15
A Copper(II)‐catalyzed thioamination of β‐nitroalkene with 1H‐benzo[d]imidazole‐2‐thiol has been developed for the synthesis of benzo[4,5]imidazo[2,1‐b]thiazole derivatives. A variety of N‐fused benzoimidazothiazole derivatives are obtained in high yields through successive C−N and C−S bond formations. This protocol is also applicable to β‐substituted β‐nitroalkenes to afford 2,3‐disubstituted benzoimidazothiazoles
已开发出一种铜(II)催化的β-硝基烯烃与1 H-苯并[ d ]咪唑-2-硫醇的硫胺化反应,用于合成苯并[4,5]咪唑并[2,1– b ]噻唑衍生物。通过连续的CN和CS键形成,可以高收率获得各种N稠合的苯并咪唑并噻唑衍生物。该方案也适用于β-取代的β-硝基烯烃,以提供2,3-二取代的苯并咪唑并噻唑。
Copper-catalyzed aminothiolation of terminal alkynes with tunable regioselectivity
作者:Jinqiang Kuang、Yuanzhi Xia、An Yang、Heng Zhang、Chenliang Su、Daesung Lee
DOI:10.1039/c8cc09122f
日期:——
A simple, mild, and efficient catalytic aminothiolation of terminal alkynes for the synthesis of both 2- and 3-substituted thiazolo[3,2-a]benzimidazoles is established upon catalysis with copper(I), in which complementary regioselectivities could be achieved by using sterically different phenanthroline-based ligands.
通过铜(I)催化建立了一种简单,温和且有效的末端炔烃催化氨基巯基化反应,用于合成2-和3-取代的噻唑并[3,2- a ]苯并咪唑,其中可通过以下方法实现互补的区域选择性:使用空间不同的基于菲咯啉的配体。
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。