Indium-mediated one-pot benzimidazole synthesis from 2-nitroanilines or 1,2-dinitroarenes with orthoesters
作者:Jaeho Kim、Jihye Kim、Hyunseung Lee、Byung Min Lee、Byeong Hyo Kim
DOI:10.1016/j.tet.2011.08.017
日期:2011.10
One-pot reduction-triggered heterocyclizations from 2-nitroanilines or 1,2-dinitroarenes to benzimidazoles were investigated in this study. In the presence of indium/AcOH in ethyl acetate at reflux, reaction of 2-nitroanilines or 1,2-dinitroarenes with R–C(OMe)3 (R=Me, Ph) produced excellent yields of the corresponding benzimidazoles within 30 min to 6 h depending on the substituents of the starting
在此研究中,研究了从2-硝基苯胺或1,2-二硝基芳烃到苯并咪唑的一锅还原触发的杂环化反应。在乙酸乙酯中存在铟/ AcOH的条件下,回流时,2-硝基苯胺或1,2-二硝基芳烃与RC(OMe)3(R = Me,Ph)的反应在30分钟内可得到优异的相应苯并咪唑收率。 6小时取决于起始材料的取代基。在类似的反应条件下,与1,2-二硝基芳烃向苯并咪唑的铟介导的2-硝基苯胺到苯并咪唑的杂环化反应更快,并且产率更高。