N-Aminoazaaromatics were found to react with nitric oxide in the presence of oxygen to afford deaminated products in high yields. The reaction proceeded almost instantaneously in various solvents including water, and one to two equivalent of NO was consumed depending upon the amount of oxygen coexisted, and 1 equivalent of N2O was released in the reaction. In addition, N-aminoazoles were deaminated by potassium superoxide to give parent azoles in good yields. Two equivalents of superoxide was consumed, and about half equivalents of both nitrite and nitrate ion were released. The results demonstrated that N-aminoazoles have ability to protect the biological system against the oxidation promoted by radicals such as nitrogen oxides and superoxide. (C) 2000 Elsevier Science Ltd. All rights reserved.
DOI:
10.1016/s0968-0896(00)00118-8
作为产物:
描述:
3,5-二甲基吡唑 在
sulfamate de 2,4,6-trimethylphenyle 作用下,
以
二氯甲烷 为溶剂,
以88%的产率得到3,5-二甲基-1H-吡唑-1-胺
N-Aminopyrazoles were oxidized by electrolysis in CH3CN to give 1, 2, 3-triazines and pyrazoles. The ratio of triazine formation increased when pyridine or H2O was added to the solvent. Reaction mechanisms were investigated by the application of electrochemical methods.
Alkyl substituted monocyclic 1,2,3-triazines and their 1-and 2-oxides have been synthesized; catalytic reduction (on Pd–C) of the triazines afforded their 2,5-dihydro compounds.