Nano-ZnO Catalyzed Multicomponent One-Pot Synthesis of Novel Spiro(indoline-pyranodioxine) Derivatives

Figure 1

Recyclability of ZnO nanoparticles for the synthesis of 7′-amino-2^′2^′-dimethyl-2,4′dioxo-1,2-dihydrospiro[indoline-3,5′-pyrano[2,3-d][1^′,3^′]dioxine]-6′-carbonitrile (4a).