Synthesis of Branched Iminosugars through a Hypervalent Iodine(III)-Mediated Radical-Polar Crossover Reaction
作者:Andrés G. Santana、Nieves R. Paz、Cosme G. Francisco、Ernesto Suárez、Concepción C. González
DOI:10.1021/jo401041s
日期:2013.8.2
The synthesis of a novel type of branched iminosugars is described. This synthetic strategy is based on two key reactions: first, an aldol reaction with formaldehyde in order to introduce selectively the hydroxymethyl branch, and second, a tandem β-fragmentation-intramolecular cyclization reaction. The combination of both reactions afforded a battery of compounds exhibiting a great structural complexity
描述了新型的支链亚氨基糖的合成。该合成策略基于两个关键反应:首先是与甲醛的醛醇缩合反应,以选择性地引入羟甲基支链;其次,是串联β-片段化-分子内环化反应。两种反应的结合提供了一系列具有极大结构复杂性的化合物,并伴随着从容易获得的醛糖开始的季中心的形成。通过这种方法,我们已经证明了由PhIO / I 2系统促进的异头烷氧基自由基(ARF)断裂对制备新化合物的用途,这对于医学和合成化学家均具有潜在的意义。