
One pot four-component reaction for the efficient synthesis of spiro[indoline-3,4â²-pyrano[2,3-c]pyrazole]-3â²-carboxylate derivatives
Keywords: مالونونیترول; Multicomponent reaction; Domino reaction; Isatin; Malononitrile; Hydrazine hydrate; Dialkyl acetylenedicarboxylate;