3-(4-Fluorophenyl)propionic acid → Methyl 3-(4-fluorophenyl)propanoate

Reaktionsgleichung

[F:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][C:10]([OH:12])=[O:11])=[CH:4][CH:3]=1.[CH3:13][Si](C=[N+]=[N-])(C)C>C1(C)C=CC=CC=1.CO>[F:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:8][CH2:9][C:10]([O:12][CH3:13])=[O:11])=[CH:6][CH:7]=1

Komponenten

Versuchsvorschrift

To a solution of 3-(4-fluorophenyl)propionic acid (4.75 g, 28.2 mmol) in toluene (130 mL) and methanol (20 mL) was added trimethylsilyldiazomethane (2M solution in hexane, 16.24 mL, 32.5 mmol). The mixture was allowed to stir for 1 hour and gas evolution was observed initially. After 1 hour, the mixture became homogeneous and was quenched via addition of 3.5 mL of acetic acid. The mixture was concentrated in vacuo, and purified via column chromatography on a Biotage 65i column eluting with 0% ethyl acetate in hexanes (1 CV) followed by a gradient to 50% ethyl acetate in hexanes (over 7 CV) to furnish the desired product. 1H NMR (CDCl3, 500 MHz) δ 7.16 (dd, J=8.0 Hz, 5.6 Hz, 2H), 6.97 (t, J=8.5 Hz, 2H), 3.66 (s, 3H), 2.92 (t, J=7.5 Hz, 2H), 2.61 (t, J=7.7 Hz, 2H).