Mild and Regioselective Three‐component Heteroarylation‐Nitration of Alkenes with Imidazo[1,2‐
<i>a</i>
]pyridines and
<i>tert</i>
‐Butyl Nitrite
作者:Jie Zhang、Shentong Xie、Ping Liu、Peipei Sun
DOI:10.1002/adsc.202000078
日期:2020.5.26
An efficient and regioselective three‐component heteroarylation‐nitration of alkenes with imidazo[1,2‐a ]pyridines and tert ‐butyl nitrite has been developed. The process tolerants a variety of functional groups under mild conditions in the absence of catalysts and additives to give nitro functionalized imidazo[1,2‐a ]pyridine derivatives in moderate to good yields. The reaction is also applicable
已经开发了一种高效的区域选择性烯烃三元杂芳基硝化硝化反应,该硝化反应包括咪唑并[1,2- a ]吡啶和亚硝酸叔丁酯。在没有催化剂和添加剂的条件下,该工艺可在温和条件下耐受各种官能团,从而以中等至良好的收率得到硝基官能化的咪唑并[1,2- a ]吡啶衍生物。该反应也适用于其他一些氮杂杂环。
K2S2O8-Mediated halogenation of 2-arylimidazo[1,2-a]pyridines using sodium halides as the halogen sources
作者:Praewpan Katrun、Chutima Kuhakarn
DOI:10.1016/j.tetlet.2019.03.008
日期:2019.4
halogenation of 2-arylimidazo[1,2-a]pyridines using sodium chloride/bromide/iodide as the halogen sources in the presence of K2S2O8 as an easy-to-handle oxidizing agent was developed. The present work offers an efficient and rapid access to 3-chloro-, 3-bromo- and 3-iodo-2-arylimidazo[1,2-a]pyridines which can be readily converted to C3-substituted imidazo[1,2-a]pyridines by cross-coupling reactions.
开发了在K 2 S 2 O 8作为易于处理的氧化剂存在下,使用氯化钠/溴化物/碘化物作为卤素源,方便地卤化2-芳基咪唑并[1,2- a ]吡啶的方法。本工作提供了一种快速有效地获得3-氯-,3-溴-和3-碘-2-芳基咪唑并[1,2- a ]吡啶的方法,这些吡啶基很容易转化为C 3取代的咪唑并[1,2] -一个]吡啶通过交叉偶联反应。
Synergy of Anodic Oxidation and Cathodic Reduction Leads to Electrochemical C—H Halogenation
作者:Zhilin Zhou、Yong Yuan、Yangmin Cao、Jin Qiao、Anjin Yao、Jing Zhao、Wanqing Zuo、Wenjie Chen、Aiwen Lei
DOI:10.1002/cjoc.201900091
日期:2019.6
We herein uncovered an electrochemical C—Hhalogenation protocol that synergistically combines anodic oxidation and cathodic reduction for C—X bond formation. The reaction was demonstrated under exogenous‐oxidant‐free conditions. Moreover, this is the first example of activating CBr4, CHBr3, and CCl3Br under electrochemical conditions.
An effective palladium-catalyzed oxidative C–H/C–H cross-coupling of imidazopyridines with azoles using air as the oxidant has been developed. This protocol provides a straightforward and operationally simple method for the synthesis of 3-azolyl-imidazopyridines in moderate to good yields and with good functional group tolerance. The biological evaluation revealed that the newly synthesized compounds
Visible-light mediated regioselective (phenylsulfonyl)difluoromethylation of fused imidazoles with iododifluoromethyl phenyl sulfone
作者:Guojie Yin、Mei Zhu、Weijun Fu
DOI:10.1515/hc-2017-0101
日期:2017.8.28
A visible-light catalyzed direct and regioselective (phenylsulfonyl)difluoromethylation of imidazo[1,2-a]pyridines and benzo[d]-imidazo [2,1-b]thiazoles with readily available PhSO2CF2I under mild conditions was developed. This synthetic methodology enables the introduction of a CF2SO2Ph group in an efficient and regioselective reaction through C-Hbondfunctionalization with a broad substrate scope