Planar Chiral Flavinium Salts: Synthesis and Evaluation of the Effect of Substituents on the Catalytic Efficiency in Enantioselective Sulfoxidation Reactions
作者:Radek Jurok、Jana Hodačová、Václav Eigner、Hana Dvořáková、Vladimír Setnička、Radek Cibulka
DOI:10.1002/ejoc.201300847
日期:2013.12
substituted planar chiral flavinium salts with a phenyl “cap” have been prepared as potential catalysts for enantioselective sulfoxidation reactions with hydrogen peroxide by using an approach based on the synthesis of (arylamino)uracils and their condensation with substituted nitrosobenzenes. The effect of substituents at various positions on the ability of the catalyst to promote enantioselective sulfoxidation
通过使用基于(芳氨基)尿嘧啶合成及其与取代亚硝基苯缩合的方法,已经制备了一系列具有苯基“帽”的取代平面手性黄酮盐作为与过氧化氢对映选择性磺化氧化反应的潜在催化剂。研究了不同位置的取代基对催化剂促进对映选择性磺化氧化反应能力的影响。将酪氨酸基团引入黄素物质的侧链或用邻异丙基苯基取代黄素单元的氮 N-3 分别对芳香族和脂肪族底物的磺化反应的对映选择性有显着的积极影响。另一方面,苯基“cap”的取代导致催化剂效率的显着降低。总之,平面手性黄素催化剂结构的优化使芳族硫化物的对映选择性高达 61% ee,叔丁基甲基硫化物的对映选择性高达 65% ee。