Research Article
Nano-ZnO Catalyzed Multicomponent One-Pot Synthesis of Novel Spiro(indoline-pyranodioxine) Derivatives
Table 1
Experimental data of 7′-amino-2′2′-dimethyl-2,4′dioxo-1,2-dihydrospiroindoline-3,5′-pyrano2,3-d-1′,3′dioxine-6′-carbonitrile (4a–f)/carboxyethylester (5a–f) under microwave irradiation (Method A) and conventional heating (Method B).
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Reaction conditions: Meldrum’s acid (1.0 mmol), isatin (1.0 mmol), malononitrile/ethylcyanoacetate (1.0 mmol), absolute ethanol (15 mL), and catalyst (30 mg). aReaction under microwave irradiation was carried out at 420 watts. |