We report the concise, biomimetic total synthesis of the dimeric, Diels-Alder natural product griffipavixanthone from a readily accessible prenylated xanthone monomer. The key step utilizes a novel intermolecular [4+2] cycloaddition-cyclization cascade between a vinyl p-quinone methide and an in situ generated isomeric diene promoted by either Lewis or Brønsted acids. Experimental and computational
我们报告了从易于获得的
异戊二烯化
氧杂蒽酮单体中二聚体 Diels-Alder
天然产物 griffipavixanthone 的简洁、仿生全合成。关键步骤利用了
乙烯基对醌甲基化物和由
路易斯酸或布朗斯台德酸促进的原位生成的异构二烯之间的新型分子间 [4+2] 环加成 - 环化级联反应。反应途径的实验和计算研究表明,逐步的阳离子 Diels-Alder 环加成是有效的。