Mesoporous Silica-coated Fe3O4 Magnetic Nanoparticles as an Efficient and Recyclable Nanocatalyst for Synthesis of Diversified Indolyl 4H-chromenes

Mesoporous silica-coated magnetic nanoparticles (Fe3O4@MSNs) is found to be an efficient recyclable organocatalyst for selective synthesis of indolyl 4H-chromenes derivatives [1].Easy reaction conditions coupled with simple work-ups, makes this methodology a superior option for synthesis of diversified indolyl 4H-chromenes [2]. The versatility ofFe3O4@MSNs catalyst is studied for the synthesisof indol-3-yl-4Hchromene derivatives from the reactionbetween salicylaldehyde, active methylene compounds, and substituted indoles [3].