Highly Efficient Michael Addition Reaction of Amines Catalyzed by Silica-Supported Aluminum Chloride

Aliphatic and aromatic amines undergo smooth nucleophilic addition to ,-unsaturated compounds in the presence of a catalytic amount of silica-supported aluminum chloride at 60C and under solvent-free conditions to produce the corresponding -amino compounds in excellent yields. This method is simple and convenient and works efficiently under mild conditions. This catalyst can used again without losing its activity three times.