A. Sato, Nobuki Sakauchi, Junya Shirai
Oct 13, 2016
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Journal
Tetrahedron
Abstract
5-Chloro-1-(5-chloro-2-(methylsulfonyl)benzyl)-2-imino-1,2-dihydropyridine-3-carboxamide hydrochloride (TAK-259) is a novel, selective, and orally active α1D adrenoceptor antagonist with anti-urinary frequency effect. A metabolite (2) of TAK-259 was identified from monkey urine samples. To elucidate the structure of 2, extraction and purification of the metabolite from TAK-259-treated monkey urine was conducted. Structural analysis of the purified compounds using NMR indicated the compound to be 2-amino-5-chloro-1-[5-chloro-2-(methylsulfonyl)benzyl]-4-oxo-1,4-dihydropyridine-3-carboxamide (2a). An authentic sample of compound 2a was synthesized via regioselective alkylation of 4-methoxypyridin-2-amine. The biological activity of metabolite 2a was also evaluated, and the compound found not to possess affinity toward any known α1 adrenoceptor subtype.