Chemical Properties
Brown, low melting solid
Uses
3-(3-Methoxyphenyl)propionic acid is used as pharmaceutical intermediates.
Definition
ChEBI: 3-Methoxybenzenepropanoic acid is a member of methoxybenzenes.
General Description
3-(3-Methoxyphenyl)propionic acid can be prepared by the catalytic (palladium on charcoal) reduction of its corresponding unsaturated acid with H
2.
Synthesis
3-Methoxycinnamic acid (8) (3.56 g, 19.98 mmol) was dissolved in methanol (100 mL) and 10% Pd/C catalyst (0.44 g) was added. The mixture was stirred in a hydrogen (balloon) atmosphere for 12 h at room temperature. Upon completion of the reaction, the reaction mixture was filtered through diatomaceous earth (Celite) and the diatomaceous earth was washed with ethyl acetate (3 x 30 mL). The filtrates were combined and the ethyl acetate and methanol were removed by evaporation under reduced pressure to give 3-(3-methoxyphenyl)propionic acid (10) (3.59 g, 19.7 mmol, quantitative yield). The product was characterized by 1H NMR (CDCl3, 600 MHz) and 13C NMR (CDCl3, 150 MHz) with the following data: 1H NMR δ 11.93 (1H, s), 7.27 (1H, t, J = 7.5 Hz), 6.88 (2H, m), 6.83 (1H, d, J = 8 Hz), 3.79 (3H, s), 3.79 (3H, s) 2.99 (2H, t, J = 7 Hz), 2.73 (2H, t, J = 7 Hz); 13C NMR δ 179.2, 159.9, 142.0, 129.6, 120.7, 114.2, 111.6, 54.9, 35.5, 30.6.
References
[1] MedChemComm, 2016, vol. 7, # 12, p. 2418 - 2427
[2] Patent: US2018/2355, 2018, A1. Location in patent: Paragraph 0094
[3] Journal of Organic Chemistry, 1992, vol. 57, # 4, p. 1262 - 1271
[4] Journal of Organic Chemistry, 1996, vol. 61, # 26, p. 9146 - 9155
[5] Tetrahedron Asymmetry, 2014, vol. 25, # 6-7, p. 578 - 582
