Reaction of α-Hydroxyamino Ketones with Dicarbonyl Compounds – Synthesis of Imidazoline Nitroxides with a Functional Group in a Side Chain
作者:Vladimir A. Reznikov、Leonid B. Volodarsky
DOI:10.1002/jlac.199719970537
日期:1997.5
The reaction of α-hydroxyamino ketones 1 with diacetyl, acetyl acetone or acetoacetic ester in the presence of ammonium acetate results in the formation of 3-imidazoline derivatives 2, which are precursors for the synthesis of stable nitroxides 8, 9, 14, 16, 17, 23–24 with various functional groups in the side chain at the 2-position of the heterocycle.
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.
REZNIKOV, V. A.;VOLODARSKIJ, L. B., XIMIYA GETEROTSIKL. SOED.,(1990) N, S. 772-778