alpha-Phenyl-N-tert-butyl nitrone (PBN) derivatives : Synthesis and protective action against microvascular damages induced by ischemia/reperfusion

Nitrones 4-7, structurally related to PBN (1), were prepared by reaction of the corresponding aromatic aldehydes with N-tert-butyl hydroxylamine. The protective effects of these nitrones against microvascular damages in ischemia/reperfusion in the 'hamster cheek pouch' assay were studied and 1, as well as 4a, 4b, and 7 (derived from piperonal, O-benzyl vanillin, and furfural, respectively), showed to be more active than shark cartilage or a-tocopherol. No correlation was found between the protective effect of these nitrones and their log P (partition coefficient) or their capacity to trap OH and CH3 radicals