Li, Xiao Long published the artcileSynthesis of the Major Metabolites of Febuxostat, Safety of 3-Bromo-2-methylpropanoic acid, the publication is Letters in Organic Chemistry (2015), 12(3), 217-221, database is CAplus.
Total synthesis of three Febuxostat metabolites, named 67M-1, 67M-2, and 67M-4,is described in this article. Through condensation of the key intermediate compound I with different side chains, and then oxidation and hydrolysis, we obtained three target compounds with an overall yield of 19.5%-28.0%.
Letters in Organic Chemistry published new progress about 56970-78-6. 56970-78-6 belongs to bromides-buliding-blocks, auxiliary class Bromide,Carboxylic acid,Aliphatic hydrocarbon chain,Inhibitor, name is 3-Bromo-2-methylpropanoic acid, and the molecular formula is C4H7BrO2, Safety of 3-Bromo-2-methylpropanoic acid.
Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary