Resumen de Green synthesis of 2-amino-3-cyano-4h-chromenes in water using nano silica-bonded 5-n-propyl-octahydro-pyrtmido[1,2-4]azepinium chloride as an effective and reusable nano catalyst

Baharfar Robabeh, Sakineh Asghariand Narges Shariati

• Nano silica-bonded 5-n-propyl-octahydro-pyrimido[1,2-a]azepinium chloride (NSB-DBU) is reported as an highly efficient and recyclable nano catalyst for the preparation of 4H-chromene derivatives in aqueous media. This synthetic method offers a simple, mild and time-saving method under entirely green and environmentally friendly conditions.