Reduction of α,α-dialkoxy-substituted nitroxides: the synthesis of α-alkoxynitrones and acetals ofN-hydroxyamides
摘要:
Reduction of stable nitroxides derived from tetrahydrooxazole, tetrahydroimidazole, 2,5-dihydroimidazole, and 2,5-dihydroimidazole 3-oxide containing alkoxy groups in alpha-position to the nitroxyl group affords alpha-alkoxynitrones, acetals of N-hydroxyamides, or their equilibrium mixtures.
Synthesis of nitroxyl radicals ? Derivatives of 5,5-dimethoxy-3-imidazoline-3-oxide-1-oxyl from 2H-imidazole 1,3-dioxides
摘要:
2H-Imidazole 1,3-dioxides containing an aldonitrone fragment in the heterocyclic ring are obtained by the oxidation of 5-unsubstituted 1-hydroxy-3-imidazoline 3-oxides. Their further oxidation by lead dioxide in methanol leads to the formation of stable nitroxyl radicals - 5,5-dimethoxy-3-imidazoline-3-oxide-1-oxyls.