作者:Yiqing Feng、Max M. Majireck、Steven M. Weinreb
DOI:10.1002/anie.201207949
日期:2012.12.14
Tetracyclic monoterpene alkaloid alstilobanine A was obtained in racemic form. The pivotal steps of the total synthesis are a novel conjugate addition of an ester enolate with a nitrosoalkene, as well as a formal [2+2] intramolecular cycloaddition leading to a β‐lactone to generate the requisite cis‐fused 2‐azadecalin moiety of the alkaloid. TMSE=trimethylsilylethoxy, Ts=4‐toluenesulfonyl.
以外消旋形式获得四环单萜生物碱alstilobanine A。全合成的关键步骤是酯烯醇化物与亚硝基烯烃的新型共轭加成,以及正式的 [2+2] 分子内环加成,导致 β-内酯生成必需的顺式稠合 2-氮杂萘烷部分生物碱。TMSE=三甲基甲硅烷基乙氧基,Ts=4-甲苯磺酰基。