Gold-coated iron oxide core–shell nanostructures for the oxidation of indoles and the synthesis of uracil-derived spirooxindoles?
New Journal of Chemistry Pub Date: 2021-12-22 DOI: 10.1039/D1NJ05205E
Abstract
Encapsulation of iron oxide (Fe3O4)-based nanoparticles (NPs) with Au NPs holds a promising scope for catalysis, which overcomes the hindrance of the inherent hydrophilic surface of iron species and facilitates the easy separation of colloidal Au NPs. As such, iron oxide-based NPs were encapsulated by Au NPs to form core–shell structures (Fe3O4/Au NPs) followed by further immobilization on in situ synthesized reduced graphene oxide (rGO) to yield Fe3O4/Au NPs–rGO for increased stability. Fe3O4/Au NPs–rGO was evaluated for the oxidation of NH-free indoles to synthesize isatins, potential precursors of SARS-CoV-2 protease inhibitors. Furthermore, the application of isatin was explored with the Fe3O4/Au NPs–rGO catalysed synthesis of uracil-based spirooxindoles (potential precursors of anti-cancer compounds) via mild reaction conditions and short reaction times with high yields.
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Journal Name：New Journal of Chemistry
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CAS no.: 89640-58-4
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