Yu H, Niles JC, Wishnok JS, Tannenbaum SR. Spirodihydantoin is a minor product of 5-hydroxyisourate in urate oxidation.
Org Lett 2005;
6:3417-20. [PMID:
15355066 DOI:
10.1021/ol048547w]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Spirodihydantoin is a minor product from oxidation of uric acid ( approximately 0.15% yield), while spiroiminodihydantoin is a major product from oxidation of 8-oxo-7,8-dihydroguanine (37% yield, pH 10.2). High pH and temperature favor the formation of both spiro compounds. (18)O labeling experiments and in situ generation and decomposition of 5-hydroxy-N7-methylisouric acid indicate that spirodihydantoin and allantoin and spiroiminodihydantoin and guanidinohydantoin are products of 5-hydroxyisourate and 5-hydroxy-8-oxo-7,8-dihydroguanine intermediates, respectively.
Collapse