An efficient Amberlite IRA-400 Cl resin catalyzed, solvent-free, one-pot synthesis of 1-
aryl-1,2-dihydro-3H-naphtho[1,2-e][1,3]oxazin-3-ones via three-component reaction of arylaldehydes,
urea, and β-naphthol are described. This method offers advantages such as easy work-up, low
environmental impact, shortened reaction times, and high yields. The catalyst recovered was reused
four times without significant loss of catalytic activity.
Keywords: Amberlite IRA-400 Cl resin, naphthoxazin-3-ones, solvent-free conditions, three-component reaction, green catalyst,
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