Gold(I)-Mediated Cycloisomerization/Cycloaddition Enables Bioinspired Syntheses of Neonectrolides B–E and Analogues
作者:Thomas J. Purgett、Matthew W. Dyer、Bryce Bickel、James McNeely、John A. Porco
DOI:10.1021/jacs.9b06355
日期:2019.9.25
neonectrolides B-E is described. The synthesis relies on gold-catalyzed 6-endo-dig hydroarylation of an unusual enynol substrate as well as a one-pot Rieche formylation/cyclization/deprotection sequence to efficiently construct the tricyclic oxaphenalenone framework in the form of a masked ortho-quinone methide (o-QM). A tandem cycloisomerization/[4+2] cycloaddition strategy was employed to quickly construct
描述了合成路线到 oxaphenalenone (OP) 天然产物新内酯 BE 的开发。该合成依赖于金催化的不寻常烯醇底物的 6-endo-dig 加氢芳基化以及单锅 Rieche 甲酰化/环化/脱保护序列,以有效地构建以掩蔽邻醌甲基化物形式存在的三环氧杂菲酮骨架。 o-质量管理)。采用串联环异构化/[4+2] 环加成策略快速构建类似于新油桃内酯的分子。三环 OP 天然产物 SF226 可以转化为 corymbiferan 内酯 E 和相关的掩蔽 o-QM。我们的研究最终将串联反应序列应用于合成新油桃 BE 以及以前未报道的外型非对映异构体。