One-Pot Eco-Safe Saccharin-Catalyzed Procedure for Expedient and Convenient Synthesis of Dihydropyrano[2,3-c]pyrazole, Tetrahydrobenzo[b]pyran and Pyrano[2,3-d]pyrimidinone Scaffolds as a Green and Versatile Catalyst - Mohamadpour, Farzaneh; Department of Chemistry, Faculty of Science, University of Sistan and Baluchestan, P.O. Box 98135-674 Zahedan, Iran (Universitas Gadjah Mada, 2018)