Iron(III) chloride-based mild synthesis of phenanthrene and its application to total synthesis of phenanthroindolizidine alkaloids
作者:Kai-Liang Wang、Mao-Yun Lü、Qing-Min Wang、Run-Qiu Huang
DOI:10.1016/j.tet.2008.06.003
日期:2008.8
Iron(III) chloride has been used to prepare polymethoxy-substituted phenanthrene-9-carboxylic acid via intramolecular oxidative coupling at room temperature in excellent yields. Mild reaction conditions and the use of environmentally friendly FeCl3 provide a novel practical route for the synthesis of the important phenanthrene ring. The further application of this protocol as the key step to total
氯化铁(III)已用于在室温下通过分子内氧化偶合以优异的收率制备聚甲氧基取代的菲-9羧酸。温和的反应条件和使用环保的FeCl 3为重要的菲环的合成提供了一条新颖的实用途径。从易于获得的吡咯开始,分别以48%,44%和46%的总收率实现了该方案作为酪氨酸,脱氧酪氨酸和antofine全面合成关键步骤的进一步应用。这种新的高效策略具有许多优势。该实验过程在温和条件下简单,原子经济性很高,没有任何保护基,原料便宜或易于制备。因此,这种简短实用的方法适用于大规模生产。