Synthesis of α-aminonitriles using silica-bonded N-propylpiperazine sulfamic acid as a recyclable catalyst

α-Aminonitriles were synthesized via a one-pot three-component condensation of aldehydes, amines, and trimethylsilyl cyanide using silica-bonded N-propylpiperazine sulfamic acid (SBPPSA) as a recyclable solid acid at room temperature. SBPPSA showed much the same efficiency when used in consecutive reaction runs.