A convergent strategy for the stereoselective synthesis of the methylester of the structurally challenging and highly labile antibacterial polyene polyketide natural product thailandamide A has been developed. The key steps include the Zincke aldehyde reaction, Stille cross coupling, Negishi reaction, Julia–Kocienski olefination, cross metathesis, and the less explored Pd(I)-based Heck coupling to
开发了一种聚合策略,用于立体选择性合成结构上具有挑战性且高度不稳定的抗菌多烯聚酮化合物天然产物泰国酰胺 A 的甲酯。关键步骤包括 Zincke 醛反应、Stille 交叉偶联、Negishi 反应、Julia-Kocienski 烯化、交叉复分解以及较少探索的基于 Pd( I ) 的 Heck 偶联以获得不同的不饱和键。此外,Urpi 乙缩醛醇醛、Evans 甲基化和 Crimmins 乙酸酯醇醛反应用于构建分子的六个不对称中心中的四个。
Kinase Inhibition by Deoxy Analogues of the Resorcylic Lactone L-783277
The natural product L-783277 is a resorcylic lactone type covalent kinase inhibitor We prepared the 5'-deoxy analogue of L-783277 (1) in a stereoselective fashion. Remarkably, this analogue retains almost the full kinase inhibitory potential of natural L-783277, with low nanomolar IC50 values against the most sensitive kinases, and it exhibits essentially the same selectivity profile (within the panel of 39 kinases investigated). In contrast, removal of both the 4'- and the 5'-hydroxyl groups leads to a more significant reduction in kinase inhibitory activity and so does a change in the geometry of the C7'-C8' double bond in 1 from Z to E. These findings offer new perspectives for the design of second generation resorcylic lactone-based kinase inhibitors.