A convenient method for the synthesis of N-hydroxyureas
作者:Dennis A. Parrish、Zhou Zou、C. Leigh Allen、Cynthia S. Day、S. Bruce King
DOI:10.1016/j.tetlet.2005.10.091
日期:2005.12
Treatment of amines with 1-(4-nitrophenol)-N-(O-benzylhydroxy)carbamate yields the O-benzyl protected N-hydroxyureas. Hydrogenation of the O-benzyl protected N-hydroxyureas over 5% Pd/BaSO4 cleanly gives the N-hydroxyureas in good yield. In addition to primary and secondary aliphatic and aromaticamines, this method converts amino sugars to the corresponding N-hydroxyureas without extensive protecting
Hydroxyurea Analogues As Kinetic and Mechanistic Probes of the Nitric Oxide Producing Reactions of Hydroxyurea and Oxyhemoglobin
作者:Jinming Huang、Zhou Zou、Daniel B. Kim-Shapiro、Samir K. Ballas、S. Bruce King
DOI:10.1021/jm0301538
日期:2003.8.1
Derivatives of N-hydroxyurea that contain an N-hydroxy group react with oxyhemoglobin to form methemoglobin and variable amounts of nitrite/nitrate. Compounds with an unsubstituted -NHOH group produce the most nitrite/nitrate, which provides evidence for nitric oxide formation. The rate of reaction of these N-hydroxyurea derivatives with oxyhemoglobin correlates well with that compound's oxidation potential
The azoxy compound lyophyllin (3) is formed in fruit-bodies of the toadstool Lyophyllum connatum by oxidative condensation of N-hydroxy-N'N'-dimethyiurea (2) with N-methylhydroxylamine (4). The condensing enzyme is remarkably unspecific and transforms a variety of hydroxyureas and N-alkyl-hydroxylamines into the corresponding lyophyllin analogues 5. (C) 1997 Elsevier Science Ltd.