Reactions of cyclic alpha -methoxy nitrones, which are derivatives of imidazole or dihydroimidazole N-oxides, with amines, KOH, or KSH result in the replacement of the MeO group to form cyclic alpha -amino nitrones, hydroxamic acids, or thiohydroxamic acids, respectively. Analogous reactions occur with C-nucleophiles.
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.