Lewis acidic (choline chloride.3ZnCl2) ionic liquid: A green and recyclable catalyst for the one-pot synthesis of 4-((3-indolyl)(aryl)methyl)-N,N-dimethylanilines under solvent-free conditions

A green and convenient procedure for the one-pot multicomponent synthesis of 4-((3-indolyl)(aryl)methyl)-N,N-dimethylanilines using (choline chloride.3ZnCl2) ionic liquid as catalyst, at 100°C and under solvent-free condition is described. Utilizing environmentally benign reagents, elimination of organic solvents, enhanced rates, reusability and moisture stability of the catalyst are the remarkable features observed in the reported reaction system. The catalyst was recycled up to four times with no noticeable drop in activity.