Total Synthesis of (±)-Taiwaniaquinol B via a Domino Intramolecular Friedel−Crafts Acylation/Carbonyl α-<i>tert</i>-Alkylation Reaction
作者:Eric Fillion、Dan Fishlock
DOI:10.1021/ja054447p
日期:2005.9.28
The first synthesis of taiwaniaquinol B, a 6-nor-5(6-->7)abeoabietane-type diterpenoid exhibiting the uncommon fused 6-5-6 tricyclic carbon skeleton, was accomplished in 15 steps. A Lewis acid-promoted tandem intramolecular Friedel-Crafts/carbonyl alpha-tert-alkylation reaction was exploited as the core strategy for the synthesis of the sterically congested 1-indanone-containing tricyclic structure
首次合成 taiwaniaquinol B,一种 6-nor-5(6-->7)abeoabietane 型二萜,具有罕见的融合 6-5-6 三环碳骨架,分 15 个步骤完成。Lewis酸促进的串联分子内Friedel-Crafts/羰基α-叔烷基化反应被用作合成空间拥挤的含1-茚满酮三环结构的核心策略。这种多重碳-碳键形成反应利用了 Meldrum 酸的独特反应性。简便的前体合成使其成为空间拥挤的含 1-茚满酮环系统的便利修饰和组装的有用方法。