Water-Promoted Dowex 50W Catalyzed Highly Efficient Green Protocol for 2-Arylbenzothiazole Formation

2-Aminothiophenol and a variety of aryl aldehydes were allowed to react in one-pot operation to give 2-aryl-benzothiazoles in excellent yields in the presence of Dowex 50W in water. Very high yields coupled with the ease of work-up procedure, formation of no side products, employment of reusable catalyst, and green synthesis in aqueous medium without maintaining anhydrous reaction conditions are the most important aspects of this methodology.