Photolysis of the thiohydroximate ester derivative 21 of 2-carboethoxy-2-(2- (benzylseleno)pyridin-3-yl)tridecylcarboxylic acid (20) affords 2-dodecyl-2- carboethoxy-2,3-dihydroselenolo[2,3-b]pyridine (22) in 89% yield in a process presumably involving intramolecular homolytic substitution by a tertiary alkyl radical at selenium with loss of a benzyl radical. Work toward extending this methodology to the preparation of pyridine-fused selenium analogues of antioxidants is described.
光解 2-羧乙氧基-2-(2-(
苄基硒基)
吡啶-3-基)
十三烷基
羧酸(20)的
硫代羟基酯衍
生物 21 可得到 2-
十二烷基-2-羧乙氧基-2,3-二氢
硒并[2、3-b]pyridine (22),收率为 89%,这一过程可能涉及
硒上的叔烷基发生分子内均聚取代反应,同时失去一个苄基自由基。本文介绍了将这种方法扩展到制备
吡啶融合
硒类似物
抗氧化剂的工作。