Iodine-Mediated Difunctionalization of Imidazopyridines with Sodium Sulfinates: Synthesis of Sulfones and Sulfides
作者:Yu-Jing Guo、Shuai Lu、Lu-Lu Tian、En-Ling Huang、Xin-Qi Hao、Xinju Zhu、Tian Shao、Mao-Ping Song
DOI:10.1021/acs.joc.7b02734
日期:2018.1.5
Novel iodine-induced sulfonylation and sulfenylation of imidazopyridines have been described using sodium sulfinates as the sulfur source. This strategy enables highly selective difunctionalization of imidazo[1,2-a]pyridine to access sulfones and sulfides in good yields. A wide range of substrates and functional groups were well-tolerated under optimized conditions. Moreover, control experiments have
已经描述了使用亚磺酸钠作为硫源的新的碘诱导的咪唑并吡啶的磺酰化和亚磺酰化。该策略能够使咪唑并[1,2- a ]吡啶高度选择性地进行双官能化,从而以高收率获得砜和硫化物。在最佳条件下,各种底物和官能团均具有良好的耐受性。此外,已经进行了对照实验,表明了反应机理中涉及的自由基途径。
Aerobic Multicomponent Tandem Synthesis of 3-Sulfenylimidazo[1,2-<i>a</i>]pyridines from Ketones, 2-Aminopyridines, and Disulfides
作者:Wenlei Ge、Xun Zhu、Yunyang Wei
DOI:10.1002/ejoc.201300905
日期:2013.9
reaction was developed for the synthesis of 3-sulfenylimidazo[1,2-a]pyridinesfrom easily available ketones, 2-aminopyridines, and disulfides without DMSO or peroxide as an oxidant. This three-component tandem reaction process involves the formation of imidazo[1,2-a]pyridines followed by Friedel–Crafts sulfenylation in one pot under mild conditions. Both aryl and alkyl ketones afforded the desired products
Unconventional Reactivity with DABCO-<i>Bis</i>
(sulfur dioxide): C-H Bond Sulfenylation of Imidazopyridines
作者:Julie Le Bescont、Chloé Breton-Patient、Sandrine Piguel
DOI:10.1002/ejoc.202000112
日期:2020.4.16
Exploring the unexpected reactivity of DABCO‐bis(sulfur dioxide) on various imidazo[1,2‐a]pyridines expanded the toolbox of the sulfenylation reagent. Starting from three simple building blocks, this three‐component transformation led to various C‐3 sulfenylated substituted imidazo[1,2‐a]pyridines in moderate to good yields.
探索DABCO-双(二氧化硫)在各种咪唑并[1,2- a ]吡啶上的出乎意料的反应性,扩大了亚磺酰化试剂的工具箱。从三个简单的结构单元开始,这种由三部分组成的转化以中等到良好的产率产生了各种C-3磺化取代的咪唑并[1,2- a ]吡啶。
C3 Sulfenylation of N-Heteroarenes in Water under Catalyst-Free Conditions
We describe herein a catalyst-free selective C−H sulfenylation of imidazo[1,2-a]pyridines using sulfonothioates as odorless source of thioarylated reagent in an aqueous medium. The method works for a variety of substitutedimidazo[1,2-a]pyridines with broad functional group tolerance. The methodology has been extends to selective sulfernylation of indoles and imidazothiazoles. The sulfonothioates are
Copper-catalyzed three-component reaction of imidazo[1,2-a]pyridine with elemental sulfur and arylboronic acid to produce sulfenylimidazo[1,2-a]pyridines
Abstract In this work, an efficient copper-catalyzedthree-componentreaction for the synthesis of sulfenylimidazo[1,2-a]pyridines using elemental sulfur as the sulfenylating agents has been developed. The reaction could proceed smoothly with a high degree of functional group tolerance and provide the desired products in moderate to good yield.