A Palladium-Catalyzed Aminoalkynylation Strategy towards Bicyclic Heterocycles: Synthesis of (±)-Trachelanthamidine
作者:Stefano Nicolai、Cyril Piemontesi、Jérôme Waser
DOI:10.1002/anie.201100718
日期:2011.5.9
Sweet cyclizations: The synthesis of pyrrolizidines and indolizidines has been achieved. Olefins were subjected to an intramolecular palladium‐catalyzed aminoalkynylation with the hypervalent iodine reagent TIPS‐EBX. After removal of the protecting group, a two‐step cyclization sequence and subsequent reduction led to the natural product (±)‐trachelanthamidine (see scheme; TIPS‐EBX=triisopropylsilyl
甜蜜的环化反应:吡咯嗪和吲哚并嗪的合成已经完成。烯烃用高价碘试剂TIPS-EBX进行了分子内钯催化的氨基炔基化反应。除去保护基团后,分两步环化,随后还原,得到天然产物(±)-曲安啶(参见方案; TIPS-EBX =三异丙基甲硅烷基乙炔基苯并恶唑啉酮)。