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Title

A SIMPLE AND GREEN APPROACH FOR THE SYNTHESIS OF PYRANOPYRAZOLE DERIVATIVES

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Abstract

 GREEN CHEMISTRY EMPHASIZES THE DEVELOPMENT OF ENVIRONMENTALLY BENIGN CHEMICAL PROCESSES AND TECHNOLOGIES [1]. MULTI-COMPONENT REACTIONS (MCR) ARE PROCESSES IN WHICH THREE OR MORE REACTANTS ARE COMBINED IN A SINGLE CHEMICAL STEP TO PRODUCE PRODUCTS THAT INCORPORATE SUBSTANTIAL PORTIONS OF ALL THE REACTANTS. MCRS COMPLY WITH THE PRINCIPLES OF GREEN CHEMISTRY IN TERMS OF ECONOMY OF STEPS AS WELL AS MANY OF THE STRINGENT CRITERIA OF AN IDEAL ORGANIC SYNTHESIS [2].PYRANOPYRAZOLES ARE FUSED HETEROCYCLIC COMPOUNDS THAT POSSESS MANY BIOLOGICAL PROPERTIES SUCH AS BACTERICIDAL [3], VASODILATORY ACTIVITIES [4] AND ACT AS ANTICANCER AGENTS [5]. THEY ALSO FIND APPLICATION AS PHARMACEUTICAL INGREDIENTS AND BIODEGRADABLE AGROCHEMICALS [6].IN CONTINUATION OF OUR WORK ON THE SYNTHESIS OF BIOLOGICALLY ACTIVE HETEROCYCLIC ORGANIC COMPOUNDS [7], HEREIN, WE ARE REPORTING A SIMPLE AND EFFICIENT SYNTHESIS OF PYRANOPYRAZOLES BY A THREE COMPONENT REACTION IN THE PRESENCE OF A GREEN CATALYST IN ETHANOL (SCHEME 1).

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