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。
Efficient and green microwave-assisted one-pot synthesis of azaindolizines in PEG-400 and water
作者:Devendra S. Wagare、Mazhar Farooqui、Tushar D. Keche、Ayesha Durrani
DOI:10.1080/00397911.2016.1223314
日期:2016.11.1
ABSTRACT A facile, convenient, environmentally benign, and one-potsynthesis of imidazo[1,2-a]pyridines from 2-aminopyridines and in-situ generated phenacyl bromides under microwave irradiation in polyethylene glycol (PEG-400) and water (1:2) has been developed. The protocol provides a better alternative to the existing method as it involves utilization of in-situ-generated α-bromoacetophenones, avoids
A simple and efficient route to 2‐arylimidazo[1,2‐a]pyridines and zolimidine using automated grindstone chemistry
作者:Dharmendra Das、Zigmee T. Bhutia、Padmini C. Panjikar、Amrita Chatterjee、Mainak Banerjee
DOI:10.1002/jhet.4106
日期:2020.11
A green and efficient mechanochemical method for the synthesis of a series of 2‐arylimidazo[1,2‐a]pyridines was developed using an electrical grinder. I2 catalyzed mechanochemical grinding facilitates the cyclocondensation reaction between various aryl methyl ketones and 2‐aminopyridines to afford 2‐arylimidazo[1,2‐a]pyridines in good yields at ambienttemperature. The method was successfully used
A direct and efficient method for the conversion of alkyl aryl ketones to imidazo[ 1,2-a]pyridines has been developed based on initial formation of α-organosulfonyloxy ketones and their subsequent cyclocondensation by 2-aminopyridines in one-pot conditions.
One-Pot Synthesis of 2-Phenylimidazo[1,2-α]pyridines from Acetophenone, [Bmim]Br3 and 2-Aminopyridine under Solvent-Free Conditions
作者:Zhang-Gao Le、Zong-Bo Xie、Jian-Ping Xu
DOI:10.3390/molecules171113368
日期:——
One-potsynthesis of 2-phenylimidazo[1,2-α]pyridines from acetophenone, [Bmim]Br3 and 2-aminopyridine under solvent-free conditions in the presence of Na2CO3, gave the corresponding 2-phenylimidazo[1,2-α]pyridines in excellent yields ranging from 72% to 89%.