作者:Stephen Birkett、Danny Ganame、Bill C. Hawkins、Sébastien Meiries、Tim Quach、Mark A. Rizzacasa
DOI:10.1021/ol200331u
日期:2011.4.15
The total synthesis of a stereoisomer of 8-deshydroxyajudazol B (4), the putative biosynthetic intermediate of the ajudazols A (1) and B (2), is described. The key steps in the synthesis included an intramolecular Diels−Alder (IMDA) reaction to secure the isochromanone fragment, a novel selective acylation/O,N-shift to give a hydroxyamide which was cyclized to the oxazole and a high yielding Sonogashira
描述了8-去羟基ajudazol B(4)的立体异构体的全合成,这是阿杜唑A(1)和B(2)的假定生物合成中间体。合成的关键步骤包括分子内Diels-Alder(IMDA)反应以确保异苯并二氢吡喃酮片段的发生,新型的选择性酰化/ O,N移位以生成羟酰胺,然后将其环化成恶唑,以及高产率的Sonogashira偶联形成C18-C19键。然后,部分炔烃还原得到目标4。