Synthesis
2-Fluoro-4-nitrobenzoic acid (1.0 g, 5.4 mmol) was used as a raw material and dissolved in 20 mL of a solvent mixture of acetic acid and methanol (1:1, v/v). A catalytic amount of palladium carbon (25 mg) was added and the reaction was stirred overnight at room temperature under hydrogen atmosphere. Upon completion of the reaction, the reaction mixture was filtered through diatomaceous earth to remove the catalyst. Subsequently, the solvent was removed by distillation under reduced pressure to afford 4-amino-2-fluorobenzoic acid (0.86 g, 100% yield) as a cream colored solid.
References
[1] Journal of Medicinal Chemistry, 2004, vol. 47, # 27, p. 6730 - 6739
[2] Patent: WO2004/11460, 2004, A2. Location in patent: Page 57
[3] Patent: WO2010/132615, 2010, A1. Location in patent: Page/Page column 133
[4] Journal of the American Chemical Society, 1944, vol. 66, p. 1631
[5] Bioorganic and Medicinal Chemistry, 2016, vol. 24, # 12, p. 2697 - 2706
