Methyl (2E)-3-(4-{2-[2-(acetylamino)-1,3-thiazol-4-yl]vinyl}thiophen-2-yl)acrylate (3.000 g, 8.971 mmol) was dissolved in ethyl acetate (400 ml) and acetic acid (100 ml). 20% Palladium carbon was added, and the mixture was hydrogenated at room temperature under an atmospheric pressure. After the completion of the reaction, the catalyst was filtered off, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (FUJI SILYSIA CHEMICAL LTD. BW-300SP, 100 g, ethyl acetate:hexane=2:3) to give methyl 3-(4-{2-[2-(acetylamino)-1,3-thiazol-4-yl]ethyl}thiophen-2-yl)propionate (2.521 g, 7.449 mmol, yield 83.0%) as a pale-yellow solid.
