PEG-mediated facile one-pot synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-ones using magnetically separable magnetite supported MgO core–shell nanocatalyst: a Green approach

A proficient technique utilizing core–shell structured Fe₃O₄@MgO nanocatalyst for the synthesis of β-naphthol condensed 1,3-oxazinone derivatives through a one-pot condensation reaction of aldehyde, urea, and β-naphthol in the presence of K₂CO₃ and Fe₃O₄@MgO nanoparticles in PEG-400 is presented. This technique provides numerous benefits, such as high yields, unaltered reactions, quick responses, reusability of the catalyst, and an uncomplicated workup technique. PEG-400 was the most effective solvent among the variety of solvents investigated for this system. In addition, polyethylene glycol (PEG) can enhance the stability of nanoparticles against oxidation, improving catalyst efficiency. This results in a more ecologically sound and sustainable protocol.