Isocyanide‐Catalyzed Reaction of Tetracyanoethylene and Activated 1,3‐Dicarbonyl CH‐Acid Compounds: A Rapid and Efficient Synthesis of Pyran Annulated Heterocyclic Systems
Abstract An isocyanide‐catalyzed reaction between tetracyanoethylene and various activated CH‐acidcompounds to afford the corresponding pyran annulated heterocyclic ring systems, in high yield at room temperature within a few minutes, is described. To the best of our knowledge, this is the first example in which isocyanide functions as only a catalyst but not a reagent.
Pyridine-functionalized MCM-41 catalyzed reactions between tetracyanoethylene and various activated CH-acid compounds are described. These reactions afford the corresponding pyran annulated heterocyclic ring systems in high yields at room temperature within a few minutes. The work-up procedure is very simple and the products do not require further purification. The catalyst can be recycled and reused for several times without observable loss of performance.
TiO2 and TiO2 nanoparticles as efficient and recoverable catalysts for the synthesis of pyran annulated heterocyclic systems
作者:Nasser Babakhani、Sajjad Keshipoor
DOI:10.1007/s11164-012-0766-8
日期:2013.7
affords the corresponding pyran annulated heterocyclic systems in high yields at room temperature in 3 h. The work-up procedure is very simple, and the products do not require further purification. The catalysts can be recycled and reused several times without observable loss of performance. Graphical abstract