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 by surfactant-templating as catalysts in a multicomponent reaction under solvent-free condi-tions. The use of these hierarchical zeolites more than doubles the activity of their microporous counterparts. These results highlight the superior diffusivity and performance of these basic hierarchical zeolites, which can be attributed to their well-developed intracrystalline mesoporosity, highly accessible and strong basic sites.

Automated summary

The synthesis of 2-amino-chromene with high yields (82%) was achieved using basic hierarchical zeolites prepared by surfactant-templating as catalysts in a solvent-free environment. The activity of these hierarchical zeolites is more than double that of their microporous counterparts. These results demonstrate the excellent diffusivity and performance of basic hierarchical zeolites, which can be attributed to their well-developed intracrystalline mesoporosity, highly accessible and strong basic sites.