Three chiral N1,N10-ethylene-bridged flavinium salts with a stereogenic centre derived from l-valinol are prepared and investigated as oxidation catalysts. These salts efficiently catalyse chemoselective H2O2 oxidation of sulfides to sulfoxides and the oxidation of 3-phenylcyclobutanone to the corresponding lactone at room temperature. The flavinium salts react with hydrogen peroxide to form flavin-10a-hydroperoxide
制备了具有衍生自1-缬氨醇的立体异构中心的三种手性N 1,N 10-亚乙基桥黄酮盐,并将其作为氧化催化剂进行了研究。这些盐在室温下有效催化硫化物的化学选择性H 2 O 2氧化为亚砜和3-苯基环丁酮氧化为相应的内酯。所述flavinium盐与过氧化氢反应以形成黄素-10一氢过氧化物,它是负责对底物氧化的试剂。