Silica-supported Zinc Chloride ZnCl2/SiO2)-induced Efficient Protocol for the Synthesis of N-sulfonyl imines and 2-Arylbenzothiazole

A straightforward strategy for the synthesis of N-sulfonyl imine derivatives from sulfona-mides and aryl aldehydes utilizing Silica-supported zinc chloride (ZnCl2/SiO2, silzic) as a catalyst under solvent-free conditions has been developed. 2-Arylbenwthiazole derivatives were also synthesized by the reaction of 2-aminothiophenol with aryl aldehydes under the same conditions. This procedure has advantages of high yields, mild reaction condition, simple procedure, low cost, and simplicity of workup. The catalyst has the same efficiency on its reuse up to three times.