A simple and practical method has been developed for the regioselective nitrosylation of imidazopyridines via C(sp2)–H bond functionalization using tert-butyl nitrite under mild reaction conditions.
NaNO<sub>2</sub>/I<sub>2</sub>-Mediated Regioselective Synthesis of Nitrosoimidazoheterocycles from Acetophenones by a Domino Process
作者:Sushobhan Mukhopadhyay、Shashikant U. Dighe、Shivalinga Kolle、Praveen K. Shukla、Sanjay Batra
DOI:10.1002/ejoc.201600553
日期:2016.8
regioselective synthesis of nitrosoimidazoheterocycles from the reaction of 2-aminopyridines and acetophenones in the presence of NaNO2 and I2 is described. The reaction is suggested to proceed by a domino process involving sequential imine formation, iodination, iodide displacement by the nitro group, and finally intramolecular cyclization. Reaction of these 3-nitrosoimidazo[1,2-a]pyridines with aldehydes
Selective C<sub>3</sub>-nitrosation of imidazopyridines using AgNO<sub>3</sub> as the NO source
作者:Vishal Suresh Kudale、Ching-Piao Chu、Jeh-Jeng Wang
DOI:10.1039/d2nj02115c
日期:——
We developed a novel method for selective radical nitrosation of imidazo[1, 2-a]pyridine derivatives using AgNO3 as a NO source. Moreover, one-pot and sequential one-pot strategies are effective under standard conditions. This is the first time that AgNO3 was reported to be used as a NO source. Additionally, synthetic transformation and gram-scale experiments highlighted the significance of this reaction
我们开发了一种使用 AgNO 3作为 NO 源对咪唑并[1, 2- a ] 吡啶衍生物进行选择性自由基亚硝化的新方法。此外,一锅和顺序一锅策略在标准条件下是有效的。这是 AgNO 3首次被报道用作 NO 源。此外,合成转化和克级实验突出了该反应的重要性。该协议的主要特点是毒性低、反应条件温和、官能团耐受性广。
Photocatalyzed C3–H Nitrosylation of Imidazo[1,2-a]pyridine under Continuous Flow and External Photocatalyst-, Oxidant-, and Additive-Free Conditions
This study reports a protocol for the highly regioselective photocatalyzed C–H nitrosylation of imidazo[1,2-a]pyridine scaffolds at the C3 position under a combination of visible-light irradiation and continuousflow without any external photocatalyst. This protocol involves mild and safe conditions and shows good tolerance to air and water along with excellent functional group compatibility and site
本研究报告了一种在可见光照射和连续流相结合的情况下,在没有任何外部光催化剂的情况下,在 C3 位置对咪唑并[1,2- a ]吡啶支架进行高度区域选择性光催化 C-H 亚硝基化的方案。该方案涉及温和、安全的条件,对空气和水表现出良好的耐受性,以及出色的官能团相容性和位点选择性,在光催化剂、氧化剂和添加剂的作用下以优异的产率生成各种3-亚硝基咪唑并[1,2- a ]吡啶值得注意的是,由于亚硝基化的强光吸收特性,所提出的亚硝基化反应将发色团NO引入咪唑并[1,2- a ]吡啶支架中,在可见光照射下有效发生,无需任何额外的光催化剂产品。这项研究可以指导未来开发具有广泛潜在应用的绿色有机合成策略的研究。