Nano silica phosphoric acid: an efficient catalyst for the one-pot synthesis of amidoalkyl naphthols under solvent-free condition

1-Amidoalkyl-2-naphthols were prepared via one-pot multi-component reaction of 2-naphthol, aldehydes, and amides in the presence of nano silica phosphoric acid under solvent-free condition at 80 A degrees C. Short reaction times, high yields, and easy work-up are the advantages of this protocol.