The Michaeladdition of indoles to electron‐deficient nitroolefins was effectively catalyzed by an ionic liquid‐coordinated ytterbium(III) sulfonate catalyst. The recycling procedure of the catalyst was very simple without extraction with water, and the catalyst was reused for five times without any loss of its catalytic activity. Furthermore, to demonstrate the application of this methodology, the
The base-free van Leusen reaction of cyclic imines on water: synthesis of <i>N</i>-fused imidazo 6,11-dihydro β-carboline derivatives
作者:Killari Satyam、V. Murugesh、Surisetti Suresh
DOI:10.1039/c9ob00660e
日期:——
imidazoles has been demonstrated on water under base-free conditions. The reaction of dihydro β-carboline imines and p-toluenesulfonylmethyl isocyanides furnished the corresponding substituted N-fused imidazo 6,11-dihydro β-carboline derivatives in very good yields under ambient conditions. The use of deuteriumoxide (D2O) as a solvent enabled the incorporation of deuterium isotopes in the imidazole ring