反应详情

To a solution of 2-Methoxy-pyridine-4-carbaldehyde (1 g, 7.29 mmol, 1 eq) in 50 ml of dry DCM was added portionwise (methoxycarbonylmethylene)triphenylphosphorane (1.05 eq, 2.56 g). The mixture was stirred at room temperature for 2 hours. The mixture was then poured into 200 ml of water and the organic substances were extracted with DCM (twice, 150 ml of DCM was used in total) The gathered DCM layers were dried and the resulting crude was purified by chromatography on BIOTAGE SP1 purification device using 50 g normal phase silica SNAP column and cyclohexane/EtOAc solvent system (gradient 2-20% of EtOAc in 20 column volumes). Solvent from the gathered fractions of appropriate composition was evaporated and obtained was 3-(2-methoxy-pyridin-4-yl)-acrylic acid methyl ester (1.3 g, yield=87.6%, purity=95%). MS: [M+H]+=194.14 1H NMR (300 MHz; CDCl3) δ/ppm 3.82(s, 3H), 3.95 (s, 3H), 6.54 (d, J=16.0 Hz, 1H), 6.80 (s, 1H), 6.97 (dd, J=5.38 Hz, J=1.31 Hz, 1H), 7.55 (d, J=16.0 Hz, 1H), 8.18 (d, J=5.38 Hz, 1H)

1. extractionthe organic substances were extracted with DCM (twice, 150 ml of DCM
2. customwere dried
3. customthe resulting crude was purified by chromatography on BIOTAGE SP1 purification device
4. customSolvent from the gathered fractions of appropriate composition was evaporated
5. customobtained