Four-component condensation of benzil, aromatic aldehydes, primary amines and ammonium acetate catalyzed by zeolite HY and silica gel without any solvent under microwave irradiation leads to tetrasubstituted imidazoles in high yields and purity.
One-pot synthesis of tetrasubstituted imidazoles catalyzed by zeolite HY and silica gel under microwave irradiation
S. Balalaie and A. Arabanian, Green Chem., 2000, 2, 274 DOI: 10.1039/B006201O
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