已开发出一种有效的铜催化级联环化反应,用于选择性合成各种苯并[4,5]咪唑并[2,1- a ]异喹啉衍生物。该反应特征在于依次形成三个不同的C N键。在存在Cu(OAc)2和KO t Bu的情况下,邻炔基苯甲腈和2-碘苯胺能顺利进行,以中等至良好的产率获得相应的苯并[4,5]咪唑并[2,1- a ]异喹啉。
The rhodium-catalyzed intramolecular direct arylation of imidazole and benzimidazole derivatives via double C–H bond activation is described. This approach provides new access to a wide range of imidazo and benzimidazo[2,1-a]isoquinoline derivatives in moderate to high yields. This reaction provides an alternative method to the known Pd-catalyzed intramolecular oxidative cross-coupling reactions.
铑催化的分子内芳基直接芳基化 咪唑和苯并咪唑衍生物通过双CH键活化。该方法以中等至高收率提供了广泛的咪唑和苯并咪唑并[2,1- a ]异喹啉衍生物的新途径。该反应为已知的Pd催化的分子内氧化交叉偶联反应提供了替代方法。
An efficient synthesis of 6-arylbenzo[4,5]imidazo[2,1-a]isoquinolines via sequential α-arylation of carbonyl and deacylation catalyzed by CuI
作者:Wei-Qing Miao、Jian-Quan Liu、Xiang-Shan Wang
DOI:10.1039/c7ob01022b
日期:——
Dibenzoyl methane was found to undergo α-arylation of carbonyl and deacylation reaction with 2-(2-bromophenyl)-1H-benzo[d]imidazoles catalyzed by CuI in the presence of Cs2CO3, and provided an efficientsynthesis of 6-arylbenzo[4,5]imidazo[2,1-a]isoquinolines via subsequent intra-molecular nucleophilic addition and dehydration.
发现二苯甲酰甲烷在Cs 2 CO 3存在下与CuI催化的2-(2-溴苯基)-1 H-苯并[ d ]咪唑发生羰基的α-芳基化反应和脱酰反应,并有效合成了6 -芳基苯并[4,5]咪唑并[2,1- a ]异喹啉通过随后的分子内亲核加成和脱水作用。
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。
Nickel‐Catalyzed Annulation of
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‐Haloarylamidines with Aryl Acetylenes: Synthesis of Isoquinolone and 1‐Aminoisoquinoline Derivatives
作者:Hao Xie、Qiaoyan Xing、Zhifei Shan、Fuhong Xiao、Guo‐Jun Deng
DOI:10.1002/adsc.201801635
日期:2019.4.16
An efficient method for the synthesis of substituted 1(2H)‐isoquinolone derivatives via nickel‐catalyzed annulation of substituted 2‐halobenzamidines with aryl alkynes in the presence of water is described. Benzo[4,5]imidazo[2,1‐a]isoquinolines were formed as the dominated products when dry dimethyl sulfoxide was used as the solvent. Furthermore, when benzyl substituted amidines were used as the substrates