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There are two unique molecules in the asymmetric unit of the title compound, C17H15NO4, which are linked into chains via intermolecular N—H...O and C—H...O interactions; the chains are linked via weak C—H...O interactions, forming a parallel sheet structure. The molecule is approximately planar, with dihedral angles of 19.91 (4) and 11.06 (4)° between the naphthyl ring and the aminomethylene group, and between the aminomethylene unit and the planar part of the dioxane ring, respectively. The dioxane ring adopts a half-boat conformation, with the C atom between the dioxane O atoms 0.595 (8) Å out of the plane through the remaining atoms. The molecule has an intramolecular N—H...O hydrogen bond which stabilizes the planar conformation.