Sustainable synthesis of sulfonamides using supported ionic liquid phase catalyst containing Keggin‐type anion

Abstract

A silica-supported ionic liquid phase catalyst containing Keggin-type anion has been prepared by covalent grafting of ferrocenetagged ionic liquid in a matrix of silica followed by anion metathesis reaction. This novel catalyst served as a robust heterogeneous catalyst for the synthesis of biologically active sulfonamides from 4-toluenesulfonyl chloride and amines. Additionally, recycling experiments showed that the catalyst could be reused five times.