Synthesis of 2,5-Bis(spirocyclohexane)-Substituted Nitroxides of Pyrroline and Pyrrolidine Series, Including Thiol-Specific Spin Label: An Analogue of MTSSL with Long Relaxation Time
作者:Igor A. Kirilyuk、Yuliya F. Polienko、Olesya A. Krumkacheva、Rodion K. Strizhakov、Yurii V. Gatilov、Igor A. Grigor’ev、Elena G. Bagryanskaya
DOI:10.1021/jo301235j
日期:2012.9.21
The nitroxides of 7-azadispiro[5.1.5.2]pentadecane and 7-azadispiro[5.1.5.2]pentadeca-14-ene series have been prepared, including thiol-specific methane thiosulfonate spin label for site-directed spin labeling. The effect of spirocyclohexane moieties on chemical and spectral properties has been studied. The obtained temperature dependencies of electron spin relaxation parameters demonstrate that new
制备了7-氮杂二叠氮[5.1.5.2]十五烷和7-氮杂二叠氮[5.1.5.2]十五烷-14-烯系列的氮氧化物,包括用于定点自旋标记的硫醇特异性甲烷硫代磺酸盐自旋标记。研究了螺环己烷部分对化学和光谱性质的影响。获得的电子自旋弛豫参数的温度依赖性表明,新的氮氧化物可能适用于80–120 K的PELDOR距离测量。此外,与哌啶系列的螺环己烷取代的氮氧化物相比,新的氮氧化物显示出更高的抗坏血酸还原稳定性,并显示出1.3还原速率是相应的2,2,5,5-四甲基氮氧化物的–3.14倍。