synergistic use of chiral bifunctional ammonium iodide catalysts in combination with simple catalytically relevant aldimines allows for an unprecedented asymmetric α-hydroxylation reaction of β-ketoesters using H2O2. The reaction proceeds via in situ formation of a hypervalent iodine species, which then reacts with the used aldimine to generate an activated electrophilic oxygen transfer reagent.
手性双官能碘化铵催化剂与简单的催化相关的醛亚胺的协同使用可实现前所未有的使用H 2 O 2的β-酮酸酯的不对称α-羟基化反应。该反应通过原位形成高价碘物质进行,然后与用过的醛亚胺反应生成活化的亲电子氧转移试剂。