Research Article
Nano-ZnO Catalyzed Multicomponent One-Pot Synthesis of Novel Spiro(indoline-pyranodioxine) Derivatives
Table 2
Comparison of catalytic activity of ZnO nanoparticles in the synthesis of compounds 4a and 5a by conventional heating and microwave irradiation method (MW).
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Amount of Reactants: Meldrum acid (1.0 mmol), isatin (1.0 mmol), and malononitrile/ethylcyanoacetate (1.0 mmol); reaction under microwave irradiation was carried out at 420 watts. |