A Ring-Closing Enyne Metathesis Approach to Functionalized Semicyclic Dienes: The Total Synthesis of (-)-Tetrangomycin
作者:Lindon W. K. Moodie、David S. Larsen
DOI:10.1002/ejoc.201301627
日期:2014.3
The angucycline antibiotic (–)-tetrangomycin was synthesized in 13 steps (11 % overall yield) by using a stereoselective Diels–Alder reaction between a naphthoquinone and a semicyclic diene to construct the benz[a]anthraquinone ring system. The diene intermediates were synthesized through a ring-closing enyne metathesis reaction. The tertiary alcohol at C-3 was installed by an asymmetric dihydroxylation
通过使用萘醌和半环二烯之间的立体选择性 Diels-Alder 反应构建苯并 [a] 蒽醌环系统,通过 13 个步骤合成了环环素抗生素 (-)-四环霉素(总产率为 11%)。二烯中间体通过闭环烯炔复分解反应合成。C-3 处的叔醇通过不对称二羟基化反应安装。二烯的相对立体化学通过环加合物的核磁共振分析得到验证,环加合物是从它们与 N-苯基马来酰亚胺的反应中获得的。B环的选择性芳构化是在氧化条件下实现的。