Copper-catalyzed C-C coupling and cyclization: Synthesis of benzo[4,5]imidazo[1,2-a]pyridines and benzo[4,5]imidazo[2,1-a]isoquinolines
作者:Byeong Woo Yang、Pham Duy Quang Dao、Nam Sik Yoon、Chan Sik Cho
DOI:10.1016/j.jorganchem.2017.09.025
日期:2017.11
3-diketones in DMF in the presence of a catalytic amount of copper(I) iodide and a base to afford the corresponding benzo[4,5]imidazo[1,2-a]pyridines in moderate yields. 2-(2-Bromoaryl)benzimidazoles also react with 1,3-diketones under similar reaction conditions to give benzo[4,5]imidazo[2,1-a]isoquinolines in similar yields.
在催化量的碘化铜(I)和碱存在下,将2-(2-溴乙烯基)苯并咪唑与1,3-二酮在DMF中偶联并环化,得到相应的苯并[4,5]咪唑[1, 2- α ]吡啶的产率中等。2-(2-溴芳基)苯并咪唑还可以在相似的反应条件下与1,3-二酮反应,以相似的产率得到苯并[4,5]咪唑并[2,1- a ]异喹啉。
Synthesis of Trinuclear Benzimidazole‐Fused Hybrid Scaffolds by Transition Metal‐Free Tandem C(sp
<sup>2</sup>
)−N Bond Formation under Microwave Irradiation
作者:Pham Duy Quang Dao、Chan Sik Cho
DOI:10.1002/ejoc.202100419
日期:2021.8.6
A class of trinuclear N-fused hybrid scaffolds was constructed by transition metal-freeC(sp2)-N coupling and cyclization of 2-(2-bromoaryl)- or 2-(2-bromovinyl)benzimidazoles with 2-methoxy- or 2-aryloxybenzimidazoles under microwave irradiation.
Construction of Binuclear Benzimidazole-Fused Quinazolinones and Pyrimidinones Using Aryl Isocyanates as Building Blocks by Transition-Metal-Free C(sp<sup>2</sup>)–N Coupling
作者:Pham Duy Quang Dao、Chan Sik Cho
DOI:10.1021/acs.joc.0c02067
日期:2020.10.16
of binuclear N-fused hybrid scaffolds was constructed by the reaction of 2-(2-bromoaryl)- and 2-(2-bromovinyl)benzimidazoles with aryl isocyanates as building blocks in the presence of a base under microwave irradiation. A nucleophilic addition followed by an unprecedented transition-metal-free C(sp2)–N coupling is proposed as a reaction pathway of this green process.
Copper-Catalyzed Construction of Trinuclear N-Fused Hybrid Scaffolds Using Cyclic Ureas as New Building Blocks
作者:Pham Duy Quang Dao、Chan Sik Cho
DOI:10.1002/ejoc.201901588
日期:2020.1.23
A new synthetic method of trinuclear N‐fused hybridscaffolds has been developed by copper‐catalyzed C–N coupling and cycloconedensation of 2‐(2‐bromoaryl)‐ and 2‐(2‐bromovinyl)‐benzimidazoles with cyclicureas as newbuildingblocks. Further studies on the synthesis of polynuclear N‐fused hybridscaffoldsusing this protocol are expected.
Palladium-catalyzed carbonylative cyclization of 2-(2-bromovinyl)benzimidazoles leading to pyrrolone-fused benzimidazoles
作者:Byeong Woo Yang、Son Long Ho、Ho-Jin Lim、Chan Sik Cho
DOI:10.1016/j.jorganchem.2015.12.040
日期:2016.3
2-(2-Bromovinyl)benzimidazoles are carbonylatively cyclized under carbon monoxide pressure in toluene in the presence of a catalytic amount of PdCl2 and PPh3 along with a base to give 1H-benzo[d]pyrrolo[1,2-a]imidazolones in good yields.
将2-(2-溴乙烯基)苯并咪唑在一氧化碳压力下于甲苯中,在催化量的PdCl 2和PPh 3以及碱的存在下羰基化环化,得到1 H-苯并[ d ]吡咯并[1,2- a咪唑啉酮收率良好。