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2-[Hydroxy-(2-methyl-pyrimidin-5-yl)-methyl]acrylic acid methyl ester (1.58 g, 7.58 mmol, 1 eq) and 4-DMAP (0.4 eq, 370 mg) were dissolved in 30 ml of dry DCM under argon atmosphere. To the mixture, cooled at 0° C., was added acetic anhydride (1.5 eq, 1.07 ml) dropwise, during 2 minutes. The mixture was warmed-up to room temperature and was stirred overnight (16 hours). The mixture was then poured into 150 ml of NaHCO3 saturated water solution and organic substances were extracted with DCM (3 times, 150 ml of DCM was used in total). The gathered DCM layers were dried, the solvent was evaporated and obtained was 2-[acetoxy-(2-methyl-pyrimidin-5-yl)-methyl]acrylic acid methyl ester (1.16 g, yield=61.1%, purity=90%) in form of orange transparent oil. MS: [M+H]+=251.25 1H NMR (300 MHz; CDCl3) δ/ppm 2.73 (s, 3H), 3.72 (s, 2H), 6.05 (s, 1H), 6.49 (s, 1H), 6.61 (s, 1H) 8.65 (s, 2H)

1. temperatureThe mixture was warmed-up to room temperature
2. extractionwere extracted with DCM (3 times, 150 ml of DCM was used in total)
3. dry with materialThe gathered DCM layers were dried
4. customthe solvent was evaporated
5. customobtained