反应详情

温度

20 °C

0.37 g (2.65 mmol) of K2CO3 and 0.51 g (2.65 mmol) of rac. allyl 2-bromopropionate were added approximately at 20° C. to a solution of 0.80 g (2.52 mmol) of 3-(4-chloro-2-fluoro-5-hydroxyphenyl)-1,5-dimethyl-6-thioxo-[1,3,5]triazinane-2,4-dione in 15 ml of dimethylformamide. After the reaction mixture had been stirred for two hours at approximately 20° C., it was stirred into ice-water. The product was extracted three times with methyl tert-butyl ether. The combined organic phases were dried over magnesium sulfate and then concentrated. The crude product (1.18 g) was purified by column chromatography (mobile phase: cyclohexane/ethyl acetate=15:1). Yield: 0.88 g (81%); 1H NMR (270 MHz, in CDCl3): δ[ppm]=1.7 (d, 3H), 3.8 (s, 6H), 4.6 (m, 2H), 4.7 (q, 1H), 5.2 (d, 1H), 5.3 (d, 1H), 5.9 (m, 1H), 6.9 (d, 1H), 7.3 (d, 1H).

1. extractionThe product was extracted three times with methyl tert-butyl ether
2. dry with materialThe combined organic phases were dried over magnesium sulfate
3. concentrationconcentrated
4. customThe crude product (1.18 g) was purified by column chromatography (mobile phase: cyclohexane/ethyl acetate=15:1)