Tungstophosphoric Acid Supported on Titania as an Eco-Friendly, Green and Reusable Catalyst for the Solvent-Free Hantzsch Multi-Component Condensation
摘要:
Tungstophosphoric acid supported on titania (PW/TiO2), catalyzed three and four component coupling of various beta-dicarbonyl compounds, aldehydes and amines under solvent free conditions. Different 4-aryl, N-hydroxy ethyl and N-aryl substituted 1,4-dihydropyridines and polyhydroquinoline derivatives, have been synthesized with high to excellent yields. Short reaction times, simple work-up, and mild reaction conditions are advantages of this procedure. The catalyst is reusable without loss of activity for five runs.
Tungstophosphoric acid supported on titania (PW/TiO2), catalyzed three and four component coupling of various beta-dicarbonyl compounds, aldehydes and amines under solvent free conditions. Different 4-aryl, N-hydroxy ethyl and N-aryl substituted 1,4-dihydropyridines and polyhydroquinoline derivatives, have been synthesized with high to excellent yields. Short reaction times, simple work-up, and mild reaction conditions are advantages of this procedure. The catalyst is reusable without loss of activity for five runs.