Palladium-Catalyzed Annulation of Arynes by <i>o</i>-Halobenzamides: Synthesis of Phenanthridinones
作者:Chun Lu、Anton V. Dubrovskiy、Richard C. Larock
DOI:10.1021/jo3016192
日期:2012.10.5
The palladium-catalyzedannulation of arynes by substituted o-halobenzamides produces N-substituted phenanthridinones in good yields. This methodology provides this important heterocyclic ring system in a single step by simultaneous C–C and C–N bond formation, under relatively mild reaction conditions, and tolerates a variety of functional groups.
Palladium-catalyzed annulation of benzynes with N-substituted-N-(2-halophenyl)formamides: synthesis of phenanthridinones
作者:Yuan Yang、Hui Huang、Lijun Wu、Yun liang
DOI:10.1039/c4ob00997e
日期:——
A novel and efficient procedure for the synthesis of N-substituted phenanthridinones via palladium-catalyzed annulation of benzynes with N-substituted-N-(2-halophenyl)formamides has been developed. This methodology constructs two new C–C bonds via an arylation/annulation process, and provides the desired products in good yields.
A halogen-atom transfer (XAT) strategy utilizing α-aminoalkyl radicals allows the generation of aryl radicals at room temperature, which is applied for intramolecular cyclization reactions en route to biologically relevant alkaloids. Starting from simple halogen-substituted benzamides under visible light irradiation in the presence of an organophotocatalyst (4CzIPN) and nBu3N allows the modular construction
利用 α-氨基烷基自由基的卤素原子转移 (XAT) 策略允许在室温下产生芳基自由基,用于分子内环化反应,生成生物学相关的生物碱。在有机光催化剂 (4CzIPN) 和n Bu 3 N 存在下,从可见光照射下的简单卤素取代苯甲酰胺开始,可以构建菲啶酮核心的模块化结构,从而可以轻松获得药物类似物和生物碱,例如,来自石蒜科的药物类似物和生物碱. 反应途径很可能涉及启用量子力学隧穿的转移事件,以实现芳构化-卤素-原子转移。
Construction of Phenanthridinone Skeletons through Palladium-Catalyzed Annulation
作者:Xin Geng、Heng He、Andrey Shatskiy、Elena V. Stepanova、Gregory R. Alvey、Jian-Quan Liu、Markus D. Kärkäs、Xiang-Shan Wang
DOI:10.1021/acs.joc.3c01429
日期:2023.9.1
Herein, a straightforward synthetic approach for the construction of phenanthridin-6(5H)-one skeletons is disclosed. The developed protocol relies on palladium catalysis, providing controlled access to a range of functionalized phenanthridin-6(5H)-ones in 59–88% yields. Furthermore, plausible reaction pathways are proposed based on mechanistic experiments.
本文公开了构建菲啶-6(5 H )-酮骨架的简单合成方法。所开发的方案依赖于钯催化,以 59-88% 的产率提供一系列功能化菲啶-6(5 H )-酮的受控访问。此外,基于机械实验提出了合理的反应途径。
Ruthenium-Catalyzed C–H Arylation of Aromatic Acids with <i>ortho</i>-Haloaniline To Access Phenanthridinones
material science; thus, it is highly desirable to develop an efficient and robust method to construct phenanthridinone from readily available starting materials. Herein, we report a Ru-catalyzed C–Harylation of aromatic carboxylic acids with ortho-haloanilines, followed by intramolecular dehydration to afford phenanthridinones in high yields.