One-Pot Eco-Safe Saccharin-Catalyzed Procedure for Expedient and Convenient Synthesis of Dihydropyrano[2,3-<i>c</i>]pyrazole, Tetrahydrobenzo[<i>b</i>]pyran and Pyrano[2,3-<i>d</i>]pyrimidinone Scaffolds as a Green and Versatile Catalyst

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