A General Cp*Co<sup>III</sup>-Catalyzed Intramolecular C−H Activation Approach for the Efficient Total Syntheses of Aromathecin, Protoberberine, and Tylophora Alkaloids
作者:Andreas Lerchen、Tobias Knecht、Maximilian Koy、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/chem.201702648
日期:2017.9.7
Herein, we report a Cp*CoIII‐catalyzed C−H activation approach as the key step to create highly valuable isoquinolones and pyridones as building blocks that can readily be applied in the total syntheses of a variety of aromathecin, protoberberine, and tylophora alkaloids. This particular C−H activation/annulation reaction was achieved with several terminal as well as internal alkyne coupling partners
在此,我们报告Cp * Co III催化的C H活化方法是创建高度有价值的异喹诺酮和吡啶酮的重要步骤,这些异喹啉酮和吡啶酮可以轻松地用于各种芳香族素,原小ber碱和tylophora生物碱的总合成。这种特殊的CH活化/环化反应是通过多个末端以及内部炔烃偶联伙伴实现的,具有广泛的应用范围和出色的官能团耐受性。本文报道的该方案的合成适用性已在两个Topo-I-抑制剂和两个8-氧代小ber碱核心的合成中得到了证明,这些核心可进一步制成四氢小ber碱和原小ber碱生物碱。此外,这些构件也以方便的方式转化为六种不同的tylophora生物碱。
Tandem C–C coupling – intramolecular acetylenic Schmidt reaction under Pd/C–Cu catalysis
作者:Venkateswara Rao Batchu、Deepak Kumar Barange、Dinesh Kumar、Bukkapattanam R. Sreekanth、K. Vyas、E. Amarender Reddy、Manojit Pal
DOI:10.1039/b617823e
日期:——
A new one-pot reaction for the regioselective construction of a six-membered fused N-heterocyclic ring leading to isoquinolones under Pd/CâCu catalysis is described.
描述了一种新的单锅反应,通过Pd/C–Cu催化,实现对六元并联N-杂环的选择性构建,生成异喹啉酮。
Ruthenium-catalyzed cascade C–H activation/annulation of <i>N</i>-alkoxybenzamides: reaction development and mechanistic insight
作者:Liangliang Song、Xiaoyong Zhang、Xiao Tang、Luc Van Meervelt、Johan Van der Eycken、Jeremy N. Harvey、Erik V. Van der Eycken
DOI:10.1039/d0sc04434b
日期:——
to alkyne insertion. This is highly different compared to the conventional mechanism of transition metal-catalyzed C–Hactivation/annulation with alkynes, involving alkyne insertion prior to N–O bond cleavage. Via this pathway, the in situ generated acetic acid from the N–H/C–Hactivation step facilitates the N–O bond cleavage to give the Ru-nitrene species. Besides the conventional mechanism forming