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。
One-Pot Synthesis of Imidazolyl Isoquinolines under a Palladium-Catalyzed C–H Activation/Annulation (CHAA) Reaction
作者:Jianhui Huang、Ranran Zhu、Yuntao Wang、Jialin Liu、Qing Wang
DOI:10.1055/s-0036-1588101
日期:——
A microwave-assisted Pd-catalyzed one-pot C–H activation/annulation (CHAA) protocol has been developed for the synthesis of imidazo[2,1-a]isoquinolines and benzo[4,5]imidazo[2,1-a]isoquinolines. Further N-alkylation for the preparation of a series of the corresponding isoquinolium salts has also been demonstrated. The fluorescent properties of these isoquinolines have been studied.
C–H Activation-Engaged Synthesis of Diverse Fused-Heterocycles from the Reactions of 3-Phenyl-1,2,4-oxadiazol-5(2<i>H</i>)-ones with Vinylene Carbonate
We report the condition-controlled C–H activation-engaged reactions of 3-phenyl-1,2,4-oxadiazol-5(2H)-ones with vinylene carbonate, straightforwardly constructing four divergent fused-heterocycles by tuning the reaction conditions in a one-pot manner.
我们报告了 3-phenyl-1,2,4-oxadiazol-5(2 H )-ones 与碳酸亚乙烯酯的条件控制 C-H 活化参与反应,通过调整反应条件直接构建了四个不同的稠合杂环一锅法。