Hierarchical basic zeolites allow for the solvent-free synthesis of chromene derivatives

The synthesis of 2-amino-chromene with excellent yields (82%) was achieved by utilizing basic hierarchical zeolites prepared surfactant-templating as catalysts in a multicomponent reaction under solvent-free conditions. use these more than doubles the activity their microporous counterparts. These results highlight superior diffusivity and performance zeolites, which can be attributed to well-developed intracrystalline mesoporosity, highly accessible strong sites.