Definition
ChEBI: 5-aminonicotinic acid is an aminonicotinic acid in which the amino group is situated at position 5 of the pyridine ring. It has a role as a metabolite. It is an aromatic amine, an aminopyridine and an aminonicotinic acid. It is functionally related to a nicotinic acid.
Synthesis
The general procedure for the synthesis of 5-aminonicotinic acid from 5-bromonicotinic acid was as follows: 5-bromo-3-pyridinecarboxylic acid (25 g, 0.124 mol) was mixed with ammonia (67.32 mL) and copper sulfate pentahydrate (8.41 g) was added. The reaction mixture was transferred to an autoclave, heated to 120 °C and kept for 16 hours. The reaction process was monitored by thin layer chromatography (TLC) using ninhydrin as a color developer. Upon completion of the reaction, the reaction mixture was washed with saturated sodium sulfide solution to remove copper ions, followed by adjusting the pH to 4-5 with concentrated hydrochloric acid.The acidified mixture was cooled to precipitate solids. The solid product was collected by filtration and dried to give 5-aminonicotinic acid (12.9 g, 74% yield).
References
[1] Bioorganic and Medicinal Chemistry, 2010, vol. 18, # 17, p. 6340 - 6350
[2] Patent: WO2004/35545, 2004, A2. Location in patent: Page 46
[3] Patent: WO2003/101959, 2003, A1. Location in patent: Page 50-51
[4] Acta Chemica Scandinavica, Series B: Organic Chemistry and Biochemistry, 1981, vol. 35, # 4, p. 289 - 294
[5] Journal of the American Chemical Society, 1948, vol. 70, p. 2381,2383
