A highly efficient and environmentally benign protocol has been developed for the construction of dihydropyrano[2,3-c] pyrazole derivatives through one-pot, multi-component cascade reaction of various aldehydes, acetoacetic ester, hydrazine hydrate and malononitrile under microwave irradiation using L-Tyrosine as catalyst in the presence of green solvent medium (ethanol-water) is described. The significant feature of this protocol is the use of ethanol-water as a green solvent system.
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