Diselenides and Allyl Selenides as Glutathione Peroxidase Mimetics. Remarkable Activity of Cyclic Seleninates Produced in Situ by the Oxidation of Allyl ω-Hydroxyalkyl Selenides
作者:Thomas G. Back、Ziad Moussa
DOI:10.1021/ja0357588
日期:2003.11.1
generated 1,2-oxaselenolane Se-oxide (31) in situ by a series of oxidation and [2,3]sigmatropic rearrangement steps. The remarkably active cyclic seleninate 31 proved to be the true catalyst, reacting with the thiol via a postulated mechanism in which the thioseleninate 32 is first produced, followed by further thiolysis to selenenic acid 33 and oxidation-dehydration to regenerate 31. In contrast to catalysis
在模型系统中测试了一系列含有配位取代基的脂肪族二硒化物和硒化物的谷胱甘肽过氧化物酶(GPx)样催化活性,其中用苄硫醇还原叔丁基氢过氧化物以提供二苄基二硫化物和叔丁醇在下进行标准条件并通过 HPLC 监测。尽管二硒化物通常表现出较差的催化活性,但烯丙基硒化物证明更有效。特别是,烯丙基 3-羟丙基硒化物 (25) 通过一系列氧化和 [2,3] sigmatropic 重排步骤在原位快速生成 1,2-oxaselenolane Se-氧化物 (31)。显着活性的环状硒酸盐 31 被证明是真正的催化剂,通过假设的机制与硫醇反应,其中首先产生硫硒酸盐 32,