Supported palladium hydroxide-catalyzed intramolecular double CH bond functionalization for synthesis of carbazoles and dibenzofurans

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• 作者：Tamao Ishida ; Ryosuke Tsunoda ; Zhenzhong Zhang ; Akiyuki Hamasaki ; Tetsuo Honma ; Hironori Ohashi ; Takushi Yokoyama ; Makoto Tokunaga
• 关键词：CH functionalization ; Carbazole ; Dibenzofuran ; Palladium hydroxide ; Heterogeneous catalyst
• 刊名：Applied Catalysis B: Environmental
• 出版年：5 May, 2014
• 年：2014
• 卷：150-151
• 期：Complete
• 页码：523-531
• 全文大小：2785 K

文摘

Metal oxide-supported palladium hydroxide (Pd(OH)₂/MO_x) catalysts enabled the oxidative intramolecular couplings of diarylamines to carbazoles and diarylethers to dibenzofurans via double aryl CH bond functionalizations with molecular oxygen as the sole oxidant. While supported PdO, Pd, and palladium acetate catalysts showed poor catalytic activities, supported Pd(OH)₂ exhibited remarkably high catalytic activity. Among supported Pd(OH)₂ catalysts, Pd(OH)₂/ZrO₂ was found to be an efficient catalyst in terms of catalytic activities and selectivities for the synthesis of carbazoles and dibenzofurans.