Nano-sawdust–BF3 as a new, cheap, and effective nano catalyst for one-pot synthesis of 2-amino benzo[h]chromene derivatives

An atom-efficient, three-component synthetic methodology has been developed for the preparation of biologically important 2-amino benzo[h]chromene using nano-sawdust–BF3 as a new catalyst. The reaction involves the use of 2-naphthol, malononitrile, and various aldehydes. A wide range of aldehydes is compatible in this reaction, producing excellent yields in short time. The morphology of nanocatalyst (nano-sawdust–BF3) was observed using a scanning electron microscopy. Also, the sawdust–BF3 surface was studied by energy dispersive X-ray spectroscopic method to find out the chemical composition.