[CH3:1][O:2][C:3](=[O:14])[CH:4]=[CH:5][C:6]1[CH:11]=[CH:10][N:9]=[C:8]([O:12][CH3:13])[CH:7]=1.C(Cl)Cl>[Pd].CCO>[CH3:1][O:2][C:3](=[O:14])[CH2:4][CH2:5][C:6]1[CH:11]=[CH:10][N:9]=[C:8]([O:12][CH3:13])[CH:7]=1A suspension of 3-(2-methoxy-pyridin-4-yl)-acrylic acid methyl ester (1.3 g, 6.72 mmol, 1 eq) and Pd/C, 10% (357 mg, 0.05 eq, 10%) was stirred in a DCM (15 ml)/absolute EtOH (15 ml) solvent mixture under hydrogen atmosphere for 1 hour at room temperature. Palladium was filtered off over a celite pad, the solvent was evaporated and obtained crude was purified by chromatography on BIOTAGE SP1 purification device using 25 g normal phase silica SNAP coloumn and cyclohexane/EtOAc solvent system (gradient 3-30% of EtOAc in 20 coloumn volumes). Solvent from the gathered fractions of appropriate composition was evaporated and obtained was 3-(2-methoxy-pyridin-4-yl)-propionic acid methyl ester (1.22 g, yield=88.2%, purity=95%) in form of transparent colourless oil. MS: [M+H]+=196.14 1H NMR (300 MHz; CDCl3) δ/ppm 2.63 (t, J=7.91 Hz, 2H), 2.90 (t, J=7.91 Hz, 2H), 3.68 (s, 3H), 3.92 (s, 3H), 6.57 (s, 1H), 6.72 (dd, J=5.33 Hz, J=1.29 Hz, 1H), 8.06 (d, J=5.33 Hz, 1H)
Loading…
