Total Synthesis of the Quinone Epoxide Dimer (+)-Torreyanic Acid: Application of a Biomimetic Oxidation/Electrocyclization/Diels−Alder Dimerization Cascade<sup>1</sup>
作者:Chaomin Li、Richard P. Johnson、John A. Porco
DOI:10.1021/ja021396c
日期:2003.4.1
An asymmetric synthesis of the quinone epoxide dimer (+)-torreyanic acid (48) has been accomplished employing [4 + 2] dimerization of diastereomeric 2H-pyran monomers. Synthesis of the related monomeric natural product (+)-ambuic acid (2) has also been achieved which establishes the biosynthetic relationship between these two natural products. A tartrate-mediated nucleophilic epoxidation involving
醌环氧化物二聚体 (+)-torreyanic 酸 (48) 的不对称合成已使用非对映体 2H-吡喃单体的 [4 + 2] 二聚化完成。相关单体天然产物 (+)-安布酸 (2) 的合成也已实现,这建立了这两种天然产物之间的生物合成关系。涉及羟基方向的酒石酸盐介导的亲核环氧化促进了关键手性醌单环氧化物中间体的不对称合成。还对基于torreyanic酸核心结构的模型二聚体进行了热解实验,并且观察到了非对映异构体2H-吡喃的平衡逆向Diels-Alder反应过程。