Efficient and eco-friendly synthesis of dihydropyrimidinones, bis(indolyl) methanes, and N-alkyl and N-arylimides in ionic liquids

Dihydropyrimidinones, bis(indolyl) methanes, and N-alkyl and N-arylimides were synthesized efficiently under mild reaction conditions in the presence of two types of ionic liquids. In each section, effects of different ILs on the yield of reactions were investigated. The use of ionic liquids offer improvements for the synthesis of title compounds with regard to the yield of products, simplicity in operation, short reaction times and green aspects by avoiding toxic catalyst and organic solvents.