An efficient method for the one‐pot synthesis of substituted phenanthridinone derivatives from N‐methoxybenzamides and aryltriethoxysilanes through rhodium‐catalyzed dual CHbondactivation and annulation reactions is described. A double‐cycle mechanism is proposed to account for this catalytic reaction. In addition, isotope‐labeling studies were performed to understand the intimate mechanism of the
A highly efficient Pd-catalyzed decarboxylative ortho-arylation of amides with aryl acylperoxides
作者:Dengke Li、Ning Xu、Yicheng Zhang、Lei Wang
DOI:10.1039/c4cc06457g
日期:——
A Pd-catalyzed decarboxylative ortho-arylation of amides with aryl acylperoxides was developed. Anilides afforded ortho-arylation products, and N-methoxyarylamides gave phenanthridinones.
General solution: An efficient rhodium‐catalyzed dual CH bond activation and cyclization of N‐methoxybenzamides 1 with aryl boronic acids 2 (see scheme; Cp*=Me5C5) provides a straightforward and general approach to the phenanthridinone structure, which occurs widely in natural products and drugs. Highly regioselective CC and CN bond formation under mild conditions afforded a wide range of substituted
通用解决方案:有效的铑催化的双CH键活化和N-甲氧基苯甲酰胺1与芳基硼酸2的环化(参见方案; Cp * = Me 5 C 5)提供了一种直接而通用的方法用于菲咯啶酮结构,广泛存在于天然产物和药物中。在温和条件下形成高度区域选择性的CC和CN键可提供广泛的取代菲啶酮3。
Strain-Promoted Oxidative Annulation of Arynes and Cyclooctynes with Benzamides: Palladium-Catalyzed C–H/N–H Activation for the Synthesis of <i>N</i>-Heterocycles
Strained alkynes include arynes and cyclooctynes reacted with N-methoxyamides through palladium-catalyzed C-H/N-H activation for the first time. A variety of important N-heterocycles such as phenanthridinones and isoquinolones were constructed in one step with high efficiency.
Annulation of Benzamides with Arynes Using Palladium with Photoredox Dual Catalysis
作者:Jie Zhao、Hongji Li、Pinhua Li、Lei Wang
DOI:10.1021/acs.joc.9b00893
日期:2019.7.19
Efficient annulation of benzamides with arynes using palladium and photoredox dual catalysis under an oxygen atmosphere is disclosed, which circumvents the use of external toxic metal oxidant and proceeds readily via aryne insertion at room temperature to construct the phenanthridinone backbone.