Spin trapping of superoxide, alkyl- and lipid-derived radicals with derivatives of the spin trap EPPN
作者:Klaus Stolze、Natascha Udilova、Thomas Rosenau、Andreas Hofinger、Hans Nohl
DOI:10.1016/s0006-2952(03)00479-9
日期:2003.11
n-butoxy, sec-butoxy, and tert-butoxy moiety, as well as the phenyl by a pyridyl ring. Electron spin resonance spectra and stabilities of the superoxide adducts of the propoxy derivatives were found to be similar to those of the respective EPPN adduct, whereas the electron spin resonance spectra of the superoxide adducts of N-2-(2-ethoxycarbonyl-propyl)-alpha-(4-pyridyl) nitrone and the butoxy derivatives
最近报道了Nt-丁基-α-苯基硝酮衍生物N-2-(2-乙氧基羰基-丙基)-α-苯基硝酮(EPPN)在pH 7.0时形成超氧化物自旋加合物(t(1/2)= 5.25 min ),其比各自的Nt-丁基-α-苯基硝酮或5,5-二甲基吡咯啉N-氧化物加合物(t(1/2)分别约为10和45s)稳定得多。在我们先前对5-(乙氧羰基)-5-甲基-1-吡咯啉N-氧化物衍生物的结构优化研究的基础上,合成了一系列六种不同的EPPN衍生物,并通过1H NMR,13C NMR和IR进行了表征。EPPN的乙氧基被丙氧基,异丙氧基,正丁氧基,仲丁氧基和叔丁氧基部分取代,苯基被吡啶基环取代。发现丙氧基衍生物的超氧化物加合物的电子自旋共振谱和稳定性与各自的EPPN加合物的相似,而N-2-(2-乙氧基羰基-丙基)-的超氧化物加合物的电子自旋共振谱和稳定性。 α-(4-吡啶基)硝酮和丁氧基衍生物伴有分解产物。与5-(乙氧基羰