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
A radical addition/cyclization of diverse ethers to 2-isocyanobiaryls under mildly basic aqueous conditions
作者:Cintia Anton-Torrecillas、Diego Felipe-Blanco、Jose C. Gonzalez-Gomez
DOI:10.1039/c6ob02103d
日期:——
Mildly basic aqueous conditions facilitated the tert-butyl peroxybenzoate (TBPB) mediated dehydrogenative addition of a range of ethers, including acetals, to diverse substituted 2-isocyanobiaryls. Mechanistic studies suggest that this radical cascade is an example of base promoted homolytic aromatic substitution (BHAS).
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。
One‐pot Cascade Reaction for the Synthesis of Phenanthridines via Suzuki Coupling/C−H Oxidation/Aromatization
作者:Yi Zhang、Yuxin Ding、Rener Chen、Yongmin Ma
DOI:10.1002/adsc.202000949
日期:2020.12.22
A one‐pot cascade coupling/annulation reaction for the synthesis of phenanthridines has been developed from arylboronic acids and o‐bromo arylamides with DMSO as a carbon source. The desired phenanthridines were obtained in moderate to good yields by using simple procedure.
A facile and practical palladium-catalyzed nucleophilic substitution/C–H activation/aromatization cascade reaction has been developed. A range of 6-unsubstituted phenanthridines could be obtained in moderate to good yields (31–85%) with readily prepared N-Ms arylamines and commercially available 2-bromobenzyl bromide derivatives as starting materials. The potential application of the protocol was also