Fe3O4 magnetic nanoparticles (MNPs) as an efficient catalyst for allylic oxidation of chromenes to coumarins with TBHP

•The catalytic system demonstrates broad applicability and efficiently converting various chromenes into coumarins.•Fe3O4 magnetic nanoparticles (MNPs) as a highly efficient catalyst for allylic oxidation.•Tert-Butyl hydroperoxide (TBHP) as the oxidant prioritizes safety and environmental sustainability, offering a safer alternative to conventional oxidizing agents.•A key advantage of Fe3O4 MNPs catalyst is its magnetic recoverability which enables effective recycling and reuse. Synthesis of coumarins via allylic oxidation of 2H-chromenes using the Fe3O4 magnetic nanoparticles (MNPs) in combination with tert‑butyl hydroperoxide (TBHP) as an oxidant is reported. This strategy is straightforward and performed at mild and economical reaction conditions. The process environmentally benign, versatile, and efficiently converting various chromenes into coumarins, which are compounds of interest in the pharmaceutical industry due to their wide range of biological activities. [Display omitted]