Condensation of the (chloromethyl)oxazole (I) with 3-hydroxybenzaldehyde (II) in the presence of K2CO3 afforded ether (III). The aldehyde group of (III) was then converted to oxime (IV) upon treatment with hydroxylamine hydrochloride and sodium acetate. Reduction of oxime (IV) with NaBH3CN produced the hydroxylamine (V). This was finally condensed with N-(chlorocarbonyl)isocyanate to produce the target oxadiazolidine dione.