An expeditious FeCl3-catalyzed cascade 1,4-conjugate addition/annulation/1,5-H shift sequence for modular access of all-pyrano-moiety-substituted chromenes
In(OTf)<sub>3</sub>-catalysed one-pot versatile pyrrole synthesis through domino annulation of α-oxoketene-N,S-acetals with nitroolefins
作者:Abhijeet Srivastava、Gaurav Shukla、Anugula Nagaraju、Girijesh Kumar Verma、Keshav Raghuvanshi、Raymond C. F. Jones、Maya Shankar Singh
DOI:10.1039/c4ob00781f
日期:——
In(OTf)3-catalyzed robust and sustainable one-pot access to previously unknown and synthetically demanding polysubstituted pyrroles via [3 + 2] annulation of α-oxoketene-N,S-acetals with β-nitrostyrenes has been achieved under solvent-free conditions. The merit of this domino Michael addition/cyclization sequence is highlighted by its operational simplicity, short reaction time (5–10 min), good to
Direct Construction of 2-Aryliminochromenes from Arynes, <i>N</i>,<i>S</i>-Keteneacetals, and DMF
作者:Li-Rong Wen、Ning-Ning Man、Wen-Kui Yuan、Ming Li
DOI:10.1021/acs.joc.6b00843
日期:2016.7.15
A concise and direct synthetic strategy for the construction of 2-aryliminochromene skeleton by cascade three-component coupling reaction of arynes, N,S-keteneacetals, and DMF in good yields has been disclosed. The process demonstrates the first example of aryne chemistry combined with N,S-keteneacetals. Using this strategy, an expeditious synthesis of biologically important arylimino-2H-chromene-3-
已经公开了通过芳烃,N,S-酮缩醛和DMF的级联三组分偶联反应以良好的产率构建2-芳基亚甲基苯胺骨架的简明而直接的合成策略。该方法证明了芳烃化学与N,S-烯酮缩醛结合的第一个例子。使用这种策略,可以快速合成生物学上重要的arilimino-2 H -chromene-3-羧酰胺。