5-(4-Isopropoxy-3-methoxycinnamylidene)-2,4-oxazolidinedione → 5-[3-(4-Isopropoxy-3-methoxyphenyl)propyl]-2,4-oxazolidinedione

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A mixture of 5-(4-isopropoxy-3-methoxycinnamylidene)-2,4-oxazolidinedione (7.1 g), palladium-carbon (5%, 7.1 g) and tetrahydrofuran (THF) (150 ml) was subjected to catalytic hydrogenation under 1 atmospheric pressure at room temperature. The catalyst was filtered off, and the filtrate was concentrated under reduced pressure. The concentrate was subjected to column chromatography on silica gel. From the fraction eluted with chloroform-ethyl acetate (4:1), 5-[3-(4-isopropoxy-3-methoxyphenyl)propyl]-2,4-oxazolidinedione (4.3 g, 60%) was obtained as an oily product.

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