Reaction of dihydropyrazine-1,4-dioxides with organolithium compounds. Synthesis of nitroxyl radicals ? derivatives of tetrahydropyrazine oxide
作者:V. A. Reznikov、L. B. Volodarskii
DOI:10.1007/bf00698953
日期:1993.5
Reaction of dihydropyrazine-1,4-dioxides with organolithium compounds followed by oxidation with MnO2 gives stable nitroxides of the pyrazine series. The reaction of a pyrazine containing methylnitrone groupings with ethylbenzoate in the presence of NaH or PhLi leads to mono- or diphenacyl derivatives, which have been shown to exist in solution as a mixture of tautomers. On treatment with hydroxylamine and subsequent oxidation the monophenacyl nitrone derivative yields a stable nitroxyl radical derived from spiroisoxazolopyrazine.