Synthesis of benzothiazoles using an iron-anchored polysulfonamide modified layered double oxide/sodium alginate nanocomposite

Abstract

The central aim of this investigation was to innovate a novel nanocatalyst for the eco-friendly synthesis of benzothiazoles through an acceptorless dehydrogenative coupling of 2-aminothiophenol and benzyl alcohol, mitigating environmental impact. In pursuit of this objective, we immobilized a poly-sulfonamide (PS) onto the surface of a layered double oxide/sodium alginate composite (LDO@SiO₂-Pr-SA), exhibiting exceptional activity and selectivity. A noteworthy achievement was the unprecedented immobilization of Fe species on this innovative nanocomposite, comprising LDO, sodium alginate, and polysulfonamides, further enhancing the environmental sustainability and economic efficiency of the process. Additionally, the catalyst demonstrated cost-effectiveness, safety, scalability, and reusability (up to 6 times), as confirmed by hot-filtration tests establishing its heterogeneity. The synthesis yielded impeccable results with high efficiency and reduced reaction time, marking a significant advancement in green and sustainable catalysis.