作者:Y. T. Duan、T. H. Parmar、C. B. Sangani、A. S. Shah、R. K. Ameta
DOI:10.1134/s107042802005019x
日期:2020.5
AbstractA simple one-pot synthesis of N-substituted benzimidazoles from aromatic carboxylic acids and aromatic 1,2-diamines in the presence of 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxide hexafluorophosphate/hydroxybenzotriazole (HATU/HOBT) and N,N-diisopropylethylamine in DMF at 100°C, featuring good to excellent yields and easy workup, is developed. The protocol can
摘要在1- [双(二甲基氨基)亚甲基] -1 H -1,2,3-三唑[4,5 ]存在下,由芳族羧酸和芳族1,2-二胺简单地一锅合成N-取代的苯并咪唑- b ]吡啶鎓-3-氧化物六氟磷酸盐/羟基苯并三唑(HATU / HOBT)和ñ,ñ二异丙基乙胺在DMF中在100℃下,具有良好至优异的产量和容易后处理,进行显影。可以将方案缩放为克量,并且不需要色谱纯化。
Electrochemical Synthesis of Benzimidazoles via Dehydrogenative Cyclization of Amidines
作者:Huai‐Bo Zhao、Jin‐Liang Zhuang、Hai‐Chao Xu
DOI:10.1002/cssc.202100254
日期:2021.4.9
sustainable methodologies for the synthesis of N‐heterocycles is a constant focus of organic synthesis. Herein an electrochemical method is reported for the synthesis of benzimidazoles through dehydrogenative cyclization of easily available N‐aryl amidines. The reactions were conducted under simple constant current conditions in an undivided cell without need for catalysts, chemical oxidants, or additives, and