作者:Martin Morgenstern、Camilla Mayer、Thorsten Bach、Alexander Pöthig
DOI:10.1055/a-1777-2477
日期:——
The carbon skeleton of the Stemona alkaloids stemokerrin and cochinchistemonine was assembled from three building blocks (a piperidine, a furan, and a tetronate). Key steps linking the fragments included a Stille cross-coupling (piperidine/furan) and an aldol-type addition of a tetronate. The furan served as a latent 1,4-difunctional compound which was converted into a γ-ketolactone by a type II photooxygenation
Stemona生物碱stemokerrin 和cochinchistemonine的碳骨架由三个组成部分(哌啶、呋喃和tetronate)组装而成。连接片段的关键步骤包括 Stille 交叉偶联(哌啶/呋喃)和醛醇型添加 tetronate。呋喃作为一种潜在的 1,4-双官能化合物,通过 II 型光氧化作用转化为 γ-酮内酯。试图通过后期氧化或消除来构建茎干蛋白的 C12-C13 双键仍然不成功。取而代之的是非天然产物dihydrostemokerrin和furostemokerrin。