Hydrochloric Acid → 3-{4-chloro-2-[2-chloro-2-(ethoxycarbonyl)ethyl]-6-fluoro-3-methoxyphenyl}-1-methyl-6-trifluoromethyl-2,4(1H, 3H)-pyrimidinedione

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A solution of 3-(2-amino-4-chloro-6-fluoro-3-methoxyphenyl)-1-methyl-6-trifluoromethyl-2,4(1H, 3H)-pyrimidinedione (0.94 g, 2.56 mmol) in acetonitrile (3 ml) was slowly added to an acetonitrile (9 ml) solution of ethyl acrylate (6 ml), tert-butyl nitrite (0.41 g, 3.97 mmol), and copper (II) chloride (0.42 g, 3.12 mmol) at −20° C. After stirred for 16 hr (−20° C. to room temperature), the mixture was poured into cold 5% hydrochloric acid (30 ml) and extracted with ethyl acetate (20 ml×3), the organic phase was washed with cold 5% NaHCO3 and brine, dried over Na2SO4. Column chromatography was used for purification (silica gel, hexane/ether=9/1) which also isolated two isomers. Yield: isomer-1 (eluted earlier), 0.23 g, 0.47 mmol; isomer-2 (eluted later), 0.14 g, 0.29 mmol.

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