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An efficient eco-friendly procedure for the synthesis of spiro[indoline-3,11'-pyrazolo[3,4- a ]acridine]-2,10'(1' H )-dione derivatives has been developed through a one-pot three-component condensation of 1 H -indazol-6-amine, isatin, and 5,5-dimethyl cyclohexane-1,3-dione or cyclohexane-1,3-dione, in the presence of catalytic amount  L -proline in EtOH at 60 °C conditions. The advantages of this protocol include mild reaction condition, green, and nontoxic solvent, high yield, and operational simplicity. IR,  1 H NMR,  13 C NMR, HRMS spectras, and elemental analyses were used to identify the structures of all the synthesized compounds.

Efficient One-Pot Synthesis of Spiro[Indoline-3,11'-Pyrazolo[3,4- a ]Acridine]- 2,10'(1' H )-Dione Derivatives Catalyzed by L-Proline