The assembly of two functional molecules via a sulfur linking atom allows an access to a diverse array of thioether‐containing compounds. Herein, we disclose a metal‐free thiolation of imidazopyridines with a variety of functionalized haloalkanes using elemental sulfur.
Oxidative dual C–H sulfenylation: A strategy for the synthesis of bis(imidazo[1,2-a]pyridin-3-yl)sulfanes under metal-free conditions using sulfur powder
作者:Ziyu Gan、Xiaolong Zhu、Qiuli Yan、Xiuyan Song、Daoshan Yang
DOI:10.1016/j.cclet.2020.12.046
日期:2021.5
Most appealingly, the reaction can proceed smoothly without addition of any additives, ultimately decreasing the production of chemical waste. The inexpensive and green method should provide a useful strategy for constructing a library of novel and biological interesting heteroaromatic sulfides.
Solvent-Driven Iodine-Mediated Oxidative Strategies for the Synthesis of Bis(imidazo[1,2-<i>a</i>]pyridin-3-yl)sulfanes and Disulfanes
作者:S. M. Abdul Shakoor、Devesh S. Agarwal、Sadhika Khullar、Sanjay K. Mandal、Rajeev Sakhuja
DOI:10.1002/asia.201701274
日期:2017.12.5
Two efficient iodine‐mediated strategies, which are economical and one‐pot, are described to access bis(imidazo[1,2‐a]pyridin‐3‐yl)sulfanes and bis(imidazo[1,2‐a]pyridin‐3‐yl)disulfanes in chloroform and acetic acid, respectively, by a direct oxidative homocoupling of imidazo‐heterocycles using inexpensive sodium sulfide as a sulfur source. These strategies are scalable, and an array of substrates
描述了两种有效的碘介导的经济方法,一种是经济的,而且是一锅法,可用于获得双(咪唑并[1,2 - a ]吡啶-3-基)硫烷和双(咪唑并[1,2 - a ]吡啶-3)。通过使用廉价的硫化钠作为硫源,直接将咪唑-杂环进行氧化均质偶合,在氯仿和乙酸中分别制得[-yl)二硫。这些策略是可扩展的,并且一系列底物以优异的产率提供了其相应的稳定的硫桥联咪唑-杂环。
Access to Sulfur-Containing Bisheterocycles through Base-Promoted Consecutive Tandem Cyclization/Sulfenylation with Elemental Sulfur
and efficient tandem cyclization/sulfenylation of o-alkynyl-phenols/-anilines/enaminones for the synthesis of diverse sulfur-containing bisheterocycles has been developed using stable, odorless, and easy-to-handle elemental S8 as a building block under green chemistry conditions. Notably, a one-step simple base-mediated organic transformation affords a benzofuran (indole or chromone) ring and two C–S
使用稳定、无味且易于处理的元素 S 8作为构建块,开发了一种用于合成多种含硫双杂环的邻炔基苯酚/-苯胺/烯胺酮的方便有效的串联环化/亚磺酰化绿色化学条件。值得注意的是,一步简单的碱介导的有机转化提供了一个苯并呋喃(吲哚或色酮)环和两个 C-S 键。这种方法的吸引人的特点包括没有金属催化剂、温和的条件、良好的官能团耐受性和有价值的产品结构。