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Developing Heterogeneous Porous 3D-Printed SiO2-Pd-K2SiO3 Monolithic Catalyst via Surface MOF Growth and Pyrolysis for the Synthesis of Antitumoral Isatins
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Developing Heterogeneous Porous 3D-Printed SiO2-Pd-K2SiO3 Monolithic Catalyst via Surface MOF Growth and Pyrolysis for the Synthesis of Antitumoral Isatins
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Developing Heterogeneous Porous 3D-Printed SiO2-Pd-K2SiO3 Monolithic Catalyst via Surface MOF Growth and Pyrolysis for the Synthesis of Antitumoral Isatins
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Journal Article
Developing Heterogeneous Porous 3D-Printed SiO2-Pd-K2SiO3 Monolithic Catalyst via Surface MOF Growth and Pyrolysis for the Synthesis of Antitumoral Isatins
2025
Overview
Background/Objectives: The isatin nucleus is a privileged scaffold in drug discovery, particularly due to its proven relevance in anticancer research. Developing reusable heterogeneous 3D catalysts for drug synthesis represents a critical challenge in both industrial and academic contexts. This multi and interdisciplinary work aimed to design and synthesize a novel 3D-printed silica-based porous catalyst functionalized with palladium, evaluate its catalytic performance in isatin drug synthesis, and assess the antiproliferative activity of the resulting compounds against tumor cell lines such as HeLa, MCF-7, and MDA-MB231. Methods: The novel multifaceted approach to synthesizing this heterogeneous catalyst involved the surface growth of a metal–organic framework (ZIF-8) on 3D-printed silica support, followed by potassium silicate coating and pyrolysis. Results: After detailed physicochemical characterization, the catalyst was tested in challenging “double” palladium-catalyzed cross-coupling reactions (Suzuki, Stille, and Heck), demonstrating robustness, reusability, and high efficiency in producing bis-1,5-aryl, alkynyl, and alkenyl-isatin derivatives. Importantly, no leaching of palladium species was detected during the catalytic cycles, further underscoring the stability of the system. These isatin-based compounds exhibited remarkable cytotoxicity, with selective molecules achieving nanomolar potency against MCF-7 cells, surpassing reference drugs such as doxorubicin and sunitinib. Conclusions: This study not only introduces a novel strategy for fabricating porous heterogeneous catalysts from sintered surfaces but also highlights new biomolecules with promising applications in cancer research.
