Green synthesis of 2-Amino-3-Cyano-4h-Chromenes in water using nano silica-Bonded 5-N-Propyl-Octahydro-Pyrimido[1,2-A]Azepinium chloride as an effective and reusable nano catalyst

Abstract

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.