Well-Ordered Mesoporous Silica Nanoparticles as a Recoverable Catalyst for One-Pot Multicomponent Synthesis of 4H-Chromene Derivatives

A simple, efficient and environmentally benign protocol for the synthesis of 4H-chromene derivatives was developed using bio-compatible, neutral, and recoverable mesoporous silica nanoparticles as a catalyst. The 4H-chromene derivatives were obtained in excellent yields by three component reaction of an aldehyde or isatin, malononitrile, and cyclic 1,3-diketones in ethanol at 60 degrees C.