Chemistry of C-2 Glyceryl Radicals: Indications for a New Mechanism of Lipid Damage
作者:Stephan N. Müller、Rohit Batra、Martin Senn、Bernd Giese、Micail Kisel、Oleg Shadyro
DOI:10.1021/ja9641416
日期:1997.3.1
generation of C-2 glyceryl radicals were synthesized, and the chemical behavior of the corresponding radicals was investigated by ESR spectroscopy, product analysis, and kinetic measurements. It was found that cleavage of the β-C,O bond proceeds rapidly, if a hydroxyl group is present at the radical carbon center. The rate constant for the elimination of a β-acetoxy group from radical 30 was dependent on
合成了选择性生成 C-2 甘油自由基的前体,并通过 ESR 光谱、产物分析和动力学测量研究了相应自由基的化学行为。发现如果羟基存在于自由基碳中心,β-C,O 键的断裂会迅速进行。从自由基 30 中消除 β-乙酰氧基的速率常数取决于溶剂(甲醇中 kE = 4 × 105 s-1,甲苯中 kE = 2 × 107 s-1)。根据这些结果和从头计算,建议使用协同消除机制。α-甲氧基取代的 C-2 甘油基 42 和 43 在自由基阳离子的形成下表现出异裂 β-C,O 键裂解。对于酯取代的基团 24 和 35,没有观察到消除。