An efficient palladium-catalyzed nucleophilic substitution/C–H activation/aromatization cascade reaction between readily available 2-halo-N-Ms-arylamines (Ms = methanesulfonyl) and benzyl halides/sulfonates has been described. A wide variety of phenanthridines were synthesized in a one-pot fashion in moderate to high yields (37–86 %). Notably, this method provides a straightforward, facile approach
Domino Suzuki coupling and condensation reaction: an efficient strategy towards synthesis of phenanthridines
作者:Munmun Ghosh、Atiur Ahmed、Raju Singha、Jayanta K. Ray
DOI:10.1016/j.tetlet.2014.11.092
日期:2015.1
A short and convenient hetero-annulation protocol has been developed for the synthesis of substituted phenanthridines via domino Suzuki coupling and condensation between N-(2-iodo-aryl)-formamide derivatives and 2-formylphenylboronic acid in the presence of Pd(OAc)2, Cs2CO3 and PPh3 as catalytic system in dry DMF at 85–90 °C for 6–7 h. The intermediate after Suzuki coupling and deprotection of nitrogen
已经开发了一种短而方便的异环合成方案,用于在Pd(OAc)2存在下通过多米诺Suzuki偶联和N-(2-碘-芳基)-甲酰胺衍生物与2-甲酰基苯基硼酸之间的缩合合成取代的菲啶。,Cs 2 CO 3和PPh 3作为干燥DMF在85–90°C下反应6–7 h的催化体系。在相同的催化系统下,铃木偶联和氮脱保护后的中间体,在立即缩合和脱水后,便以高收率提供了相应的菲啶。
Synthesis of Phenanthridines through Iodine-Supported Intramolecular C–H Amination and Oxidation under Visible Light
作者:Yan Gao、Yi Jing、Lixin Li、Jie Zhang、Xuenian Chen、Yan-Na Ma
DOI:10.1021/acs.joc.0c01390
日期:2020.10.2
Herein, we report a metal-free and step-economic synthesis of phenanthridines from 2-biarylmethanamines under mild conditions. The reaction involves iodine-supported intramolecular C–H amination and oxidation of 5,6-dihydrophenanthridine under air and benign visible light. The mechanism study reveals that visible light plays a key role in both these steps.
annulation between 2-aminobiphenyls and activated olefins is disclosed for succinct synthesis of valuable phenanthridine scaffolds. The protocol avails a common organic functional group, free amine, as a directing group and represents a unique combination of C–Hactivation/annulation/C–C bond cleavage cascade that bodes well in the production of bioactive alkaloids including trisphaeridine and bicolorine
Palladium-Catalyzed Oxidative CC Bond Cleavage Cyclization of Biaryl-2-amines with Alkenes Involving CH Olefination and Carboamination
作者:Yan-Yun Liu、Ren-Jie Song、Cui-Yan Wu、Lu-Bin Gong、Ming Hu、Zhi-Qiang Wang、Ye-Xiang Xie、Jin-Heng Li
DOI:10.1002/adsc.201100651
日期:2012.2
A new, general method for the synthesis of phenanthridines has been developed by palladium-catalyzedoxidative remote CH olefination–carboamination–CC bondcleavage tandem reaction. It is noteworthy that alkenes are used as the one-carbon resources for this tandem reaction.