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

Protective effects against microvascular damages in ischemia/reperfusion in the ‘hamster cheek pouch’ assay. 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 α-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 ·CH 3 radicals.