Abstract
A simple method for the synthesis of spiro[pyrazoloquinoline-oxindoles] and spiro[chromenopyrazolo-oxindoles] has been achieved through four-component reactions of phenylhydrazine or hydrazine hydrate, isatins, ketoesters, and naphthylamine or 2-naphthol using nano-Co3S4 under ultrasonic irradiations. The current method provides obvious positive points such as environmental friendliness, significantly shorter reaction time, markedly excellent yields, and simple workup procedure.
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Shahbazi-Alavi, H., Alemi-Tameh, F. & Safaei-Ghomi, J. Synthesis of spiro-oxindoles catalyzed by nano-Co3S4. Monatsh Chem 149, 2031–2036 (2018). https://doi.org/10.1007/s00706-018-2246-3
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DOI: https://doi.org/10.1007/s00706-018-2246-3