反应详情

温度

150 °C

A sealed mixture of 5-Bromo-2-methyl-pyrimidine (2.6 g, 15.03 mmol, 1 eq), methyl acrylate (1.40 eq, 1.89 ml), palladium(II)-acetate (0.013 eq, 44 mg), triphenylphosphine (0.024 eq, 95 mg), and triethylamine (1.21 eq, 2.54 ml) was heated at 150° C. (temperature on display of heating device) for 16 hours. The mixture was cooled to ambient temperature and was poured into 200 ml of water. Organic substances were extracted with EtOAc (twice, 200 ml was used in total). The gathered EtOAc layers were filtered over celite pad, were dried and the solvent was evaporated. The resulting crude was purified by chromatography on BIOTAGE SP1 purification device using 50 g normal phase silica SNAP column and EtOAc/cyclohexane solvent system (gradient 30-80% of EtOAc in 20 column volumes). Solvent from the gathered fractions of appropriate composition was evaporated and obtained was 3-(2-Methyl-pyrimidin-5-yl)-acrylic acid methyl ester (450 mg, yield=16.80%, purity=95%). MS: [M+H]+=179.13 1H NMR (300 MHz; CDCl3) δ/ppm 2.74 (s, 3H), 3.81 (s, 3H), 6.52 (d, J=16.60 Hz, 1H), 7.58 (d, J=16.60 Hz, 1H), 8.75 (s, 2H)

1. temperature(temperature on display of heating device) for 16 hours
2. temperatureThe mixture was cooled to ambient temperature
3. extractionOrganic substances were extracted with EtOAc (twice, 200 ml
4. filtrationThe gathered EtOAc layers were filtered over celite pad
5. customwere dried
6. customthe solvent was evaporated
7. customThe resulting crude was purified by chromatography on BIOTAGE SP1 purification device
8. customSolvent from the gathered fractions of appropriate composition was evaporated
9. customobtained