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PPA-SiO2–Catalyzed Multicomponent Synthesis of Amidoalkyl Naphthols

Abstract Silica gel–supported polyphosphoric acid (PPA-SiO2) was found to be an efficient catalyst for the multicomponent condensation reaction of aryl aldehydes, 2-naphthol, and urea or amides to afford the corresponding 1-amidoalkyl-2-naphthols in good to excellent yields. This new approach consistently had short reaction times, high conversions, clean reaction profiles, and simple experimental and workup procedures.