Preparation of spirooxindoles catalyzed by nano-Co3S4 under microwave irradiations

摘要

An efficient and rapid method is used for the synthesis of 10-methyl-8H-spiro[benzo[5,6]chrorneno[2,3-c]pyrazole-11,3'-indol]-2'(1'H)-one and 8-methyl- 10-phenyl-10, 11-dihydrospiro[pyrazolo[3,4-b]benzo[h]quinolin-7,3'-indol]-2'(1'H)-one by a four-component reactions of phenylhydrazine or hydrazine hydrate, isatins, ketoesters, and naphthylamine or 2-naphthol using nano-Co3S4 under microwave irradiation.