Synthesis of Lamellarin D Trimethyl Ether and Lamellarin H via 6π-Electrocyclization
作者:Clemes Dialer、Dennis Imbri、Steven Peter Hansen、Till Opatz
DOI:10.1021/acs.joc.5b02194
日期:2015.11.20
efficient synthesis of the pyrrole core of the lamellarin alkaloids. A recently developed scalable one-pot procedure provides multigram quantities of a 3,5-diaryl-4-iodopyrrole-2-carboxylate intermediate which is transformed in four further high-yielding operations including a one-pot Pomeranz–Fritsch alkylation/cyclization and an Ullmann-type lactone ring closure into the pentacyclic lamellarin skeleton
由查尔酮和甘氨酸酯原位产生的2-氮杂戊二烯基阴离子的电环闭合是有效合成薄片状生物碱的吡咯核心的关键步骤。最近开发的可扩展的一锅法提供了数克数量的3,5-二芳基-4-碘吡咯-2-羧酸酯中间体,该中间体可以通过四个高收益操作进行转化,包括一锅Pomeranz-Fritsch烷基化/环化反应和乌尔曼型内酯环封闭成五环层薄层蛋白骨架。