The recognition of the local symmetric image within benzofuran-based natural oligostilbenoids guided us to design a modular synthetic approach to these molecules by utilizing a three-step sequence consisting of Sonogashira coupling, iodocyclization, and Suzuki coupling. During our synthesis, the relative reactivities of ester, aldehyde, and alkoxy groups on the same aryl ring toward the neighboring alkyne in the iodine-mediated cyclization reactions were explored. Starting from the symmetrical 3,5-dimethoxybenzyl alcohol, this route allowed rapid access to 2,3-diarylbenzofuran, a key intermediate to several oligostilbenoid natural products, in good overall yields.
基于
苯并呋喃类
天然寡聚
花青素中局部对称图像的识别,我们设计了一种模块化合成方法,通过使用Sonogashira偶联、
碘环化和Suzuki偶联组成的三步序列来合成这些分子。在我们的合成过程中,探讨了在
碘介导的环化反应中,同一芳基环上的
酯、醛和烷
氧基团对邻近
炔烃的相对反应性。从对称的
3,5-二甲氧基苄醇出发,这条路线可以快速获得2,3-二芳基
苯并呋喃,这是几种寡聚
花青素天然产物的关键
中间体,总产率良好。