Highly<i>trans</i>-Selective Arylation of Achmatowicz Rearrangement Products by Reductive γ-Deoxygenation and Heck-Matsuda Reaction: Asymmetric Total Synthesis of (−)-Musellarins A-C and Their Analogues
作者:Zhilong Li、Fanny C. F. Ip、Nancy Y. Ip、Rongbiao Tong
DOI:10.1002/chem.201501713
日期:2015.7.27
Ferrier‐type and Tsuji–Trost‐type reactions, was finally enabled by an unprecedented, highly regioselective γ‐deoxygenation of AR products by using Zn/HOAc and a diastereoselective Heck–Matsuda coupling. The synthetic utility of the reaction was demonstrated in the first asymmetric total synthesis of (−)‐musellarins A–C and 12 analogues in 11–12 steps. The brevity and efficiency of our synthetic route
衍生自Achmatowicz重排(AR)的功能齐全的吡喃果糖是有机合成中的多功能构建基块。然而,从吡喃糖类中获得反式-2,6-二氢吡喃类的方法仍未得到充分研究。在此,我们提出一个新的两步跨AR产品的芳基化获得2,6-反式-dihydropyranones。这个新的反式最终,通过使用Zn / HOAc和非对映选择性的AR产品空前的,高度区域选择性的γ脱氧,最终实现了基于众多可能但不成功的直接芳基化反应(包括Ferrier型和Tsuji-Trost型反应)的芳基化方法Heck-Matsuda联轴器。该反应的合成效用在第一个不对称的(-)-musellarins A-C和12个类似物的总合成中以11-12个步骤得到了证明。我们合成路线的简洁性和高效性允许制备对映体纯的槲皮素和类似物(> 20 mg)进行初步的细胞毒性评估,这使我们确定了两种具有比musellarin更高三到六倍效力的类似物作为有希望的新先导。